CN101784416A - Seat back structure of vehicle seats and retaining structure for a crank member - Google Patents

Abstract

A pressure receiving member for receiving loads from a pelvic region and back portions of a passenger, is formed into an approximate U character shape and is connected to a crank member to hang across left and right side members inside a seat back. During a rear-end collision, the pressure receiving member shifts to and circularly moves the crank member in the backward and upper directions to circularly move circularly moving links against the energizing force provided by an extension spring. An arm of a lumbar support forms an approximate-L-character- shaped part. An insertion hole starts with a hole of a larger diameter and extends to a hole of a smaller diameter so that the arm can be inserted into the insertion hole in a horizontal direction. A bushing with a flange is mounted around the arm, and fit together with larger-diameter hole of the insertion hole to support the arm.

Description

Seat back structure of vehicle seat and holding structure for crank member

Cross References to Related Applications

This application claims foreign priority under 35 U.S.C § 119(a)-(d) of JP 2007-198558 filed July 31, 2007, JP 2007-211334 filed August 14, 2007, and claims 2008 The benefit of US Provisional Application Serial No. 61/041,715, filed April 2, which is hereby incorporated by reference in its entirety.

background

1. Technical field

An embodiment of the present invention relates to a seat back structure of a vehicle seat by causing a predetermined pressure receiving member provided inside the seat back to receive transfer of inertia in a rearward direction experienced by a passenger resulting from a rear-end collision, to forcibly change the position of the headrest in the upper direction as well as in the front direction.

Embodiments of the present invention also relate to a retaining structure for a crank member that retains the crank member in a circularly movable manner between left and right support members having insertion holes.

2. Background technology

The seat back structure of the vehicle seat realizes the load (impact load) generated by the transfer of inertia in the rearward direction experienced by a passenger when a rear-end collision occurs by a predetermined pressure receiving member provided inside the seat back. Forcibly changing the position of the headrest in, for example, the upper direction and the front direction, wherein the upper direction and the front direction are the directions in which the passenger's head moves, the seat back structure of such a vehicle seat has been disclosed in, for example, Kokai Official Gazette No.: Hei11(1999)-034708 and other documents.

This type of headrest, the so-called emergency-activated headrest, is usually powered by an energizing force from an energizing device consisting of a tension coil spring or the like, and is kept at its usual The support position, that is, is held in its lower initial position; and the supply capacity is usually set as an input criterion for impact loads resulting from rear-end collisions. In addition to the above, when a load (impact load) exceeding the set supply capacity is input to the pressure receiving member, the pressure receiving member moves in the rearward direction against the supply capacity; by the above-mentioned action, the headrest is constructed to be free from its The lower initial position is transferred to the upper changed position, which is the upper direction and the forward direction.

According to such a configuration as described above, when a rear-end collision occurs, the headrest moves to a position closer to the passenger's head, and the space between the headrest and the passenger's head becomes narrow; The degree of rear lean that occurs in the event of a rear-end collision is reduced. Therefore, it is possible to reduce damage to the neck caused by a sudden tilt of the head when a rear-end collision occurs, that is, a so-called whip-lash.

In the configuration disclosed in Kokai's Official Gazette No.: Hei11(1999)-034708 mentioned above, the pressure receiving member for receiving the impact load from the transfer of inertia in the rearward direction is provided at a position corresponding to the passenger's back portion . Generally, in the normal driving position of the passenger, the passenger's pelvic region is mostly in contact with the seating surface of the seat back, while the passenger's back portion tends to separate from the seating surface of the seat back. Because of the above tendency, when a shift of inertia in the rearward direction is applied by a rear-end collision, the passenger's back portion at least first passes through the separation distance before reaching the pressure receiving member and pressing it. In other words, when a rear-end collision occurs, due to the separation distance, the back portion of the passenger collides with the pressure receiving member energized and held by a large power supply force in a pseudo manner; therefore, it is possible that when the headrest is activated, The back portion of the passenger will be forced to receive shock loads of an excessive degree and cannot be rejected.

Compared with the configuration described above, Kokai's Official Gazette No.: 2000-325179 discloses a configuration in which the headrest is emergency actuated to its upper changing position by pressing the occupant's pelvic region against the pressure receiving member . In general, in the normal driving posture of the passenger, most of the pelvic region of the passenger is in contact with the seating surface of the seat back; therefore, the pelvic region of the passenger reaches the pressure receiving member and presses the pressure without passing through the separation distance. Receive artifacts. Therefore, if the seat back is constructed in such a way that the occupant's pelvic region presses the pressure receiving member, the impact load applied to the occupant will be reduced when the pressure receiving member is pressed.

For example, as disclosed in Kokai's Official Gazette No.: Hei 10(1998)-138812, the left and right arms of the conventional crank member are formed in a linear shape, that is, a horizontal shape without processing. In addition, horizontally shaped arms are inserted into insertion holes provided on support members of the left and right frames like the seat back frame, and bushing nuts and E rings are installed. to the arm protruding from the insertion hole so that the crank member is held between the support members in a circularly movable manner.

overview

1. The problem to be solved in the present invention

The power supply is generated by the energy supply device, and is applied to the headrest and the pressure receiving member, generally, the power supply is continuously applied to the headrest and the pressure receiving member throughout the entire movable range of the headrest. Therefore, in order to hold the headrest in its upper changed position in a stable manner, it is necessary to continuously apply an amount of pressure greater than the supply capacity to the pressure receiving member against the supply capacity.

However, the degree to which the occupant's upper torso sinks against the seat back tends to be larger with respect to the occupant's back than with the occupant's pelvic region. When the back portion of the passenger sinks into the seat back to a large extent, the input load generated by the pelvic area of the passenger and applied to the pressure receiving member tends to be due to the center of gravity that changes as the passenger's posture changes and the reduced by other factors. Therefore, in the configuration in which the load from the occupant's pelvic region presses the pressure receiving member, the stability of maintaining the headrest in the upper changed position can be reduced by the degree of reduced pressure.

In other words, in the configuration in which the occupant's back portion presses the pressure receiving member, the occupant's back portion may be forced to receive an excessive degree of impact load at the time of initial start-up, and the occupant's pelvic region may discontinuously press the pressure receiving member.

Embodiments of the present invention are intended to provide a seat back structure of a vehicle seat in which the passenger's back portion is not forced to receive an excessive degree of impact load at the time of initial start-up, and in which the passenger's pelvic region can continuously Press the pressure receiving member firmly.

However, when a bushing nut is used, it becomes necessary to apply a step-forming process to the arm edge of the crank member, and when an E-ring is used, to apply a circular groove-forming process to the arm edge of the crank member. -groove-forming process) becomes necessary. This step forming process and the circular groove forming process are special processes that are different from the bending process used to form the crank member and are therefore costly.

In addition, a special tool is required to install the bushing nut and the E ring; therefore, workability is inevitably reduced.

Furthermore, in a configuration in which the horizontally shaped arm of the crank member is inserted into the insertion hole of the support member and the crank member is held therein, when an excessive load is applied to the crank member, the load acts on the bushing in a concentrated manner. on the nut and E ring where the bushing nut and E ring are used to prevent the arm from falling out. As a result, when an excessive load capable of causing deformation is applied, the bushing nut and E-ring cannot resist the load and they break. Therefore, there is a risk that the arm falls out of the insertion hole of the supporting member.

An object of at least one embodiment of the present invention is to provide a cost-reduced holding structure for a crank member in which an arm does not fall out of an insertion hole despite its simple structure.

2. The means used to solve the problem

According to at least one embodiment of the present invention, the characteristics of this at least one embodiment of the present invention are as follows:

A seat back structure of a vehicle seat that forcibly changes the headrest by causing a predetermined pressure receiving member provided inside the seat back to receive a transfer of inertia in the rearward direction experienced by a passenger resulting from a rear-end collision position in the upper direction as well as in the front direction;

Among them, a pair of left circularly moving links and right circularly moving links (a pair of left and right circularly moving links), which are respectively installed on the left and right members of the seat back frame so as to be able to swing;

a support shaft which is laterally arranged to straddle predetermined edges suspended from the pair of left and right circular moving links so that when the circular moving links move circularly, The movement of the arc in the upper and lower direction becomes possible;

A cylinder-like holder bracket which is inserted into and supported by a headrest strut which is provided integrally with the support shaft and which is designed to pass through and be fixed to the seat a bracket guide on the upper member of the back frame to slide freely in contact with the bracket guide and to tilt freely;

Therefore, when the circular moving link circularly moves against the above-mentioned supplying force, it is possible to ensure that the headrest is in the upper changing position while tilting forward with the bracket guide as a fulcrum;

The above-mentioned pressure receiving member is fixed to the support shaft via its upper end so as to move in response to the support shaft, and the above-mentioned pressure receiving member is designed as a pressure receiving member extending in a lower direction so as to receive pressure from a passenger's pelvic area and back portion. load;

And the above-mentioned pressure receiving member is supported by a crank member which is arranged to straddle and hang in the left and right directions of the seat back and is supported to be rotatable by means of a shaft, and is arranged laterally so that in Circular movements in the rearward direction and the upper direction are possible.

According to at least one embodiment of the present invention, the characteristics of this at least one embodiment of the present invention are as follows:

A seat back structure of a vehicle seat that forcibly changes the headrest by causing a predetermined pressure receiving member provided inside the seat back to receive a transfer of inertia in the rearward direction experienced by a passenger resulting from a rear-end collision position in the upper direction as well as in the front direction;

Among them, a pair of left circular moving links and right circular moving links, which are respectively installed on the left and right members of the seat back frame so as to be able to swing;

a support shaft which is laterally arranged to straddle predetermined edges suspended from the pair of left and right circular moving links so that when the circular moving links move circularly, The movement of the arc in the upper and lower direction becomes possible;

A post-shaped holder bracket inserted into and supported by a headrest post provided integrally with a support shaft, and the bracket is designed to pass through a a bracket guide for freely sliding in contact with the bracket guide and for free tilting;

Therefore, when the circular moving link circularly moves against the above-mentioned supplying force, it is possible to ensure that the headrest is in the upper changing position while tilting forward with the bracket guide as a fulcrum;

The above-mentioned pressure receiving member is fixed to the support shaft via its upper end so as to move in response to the support shaft, and the above-mentioned pressure receiving member is designed as a pressure receiving member extending in a lower direction so as to receive pressure from a passenger's pelvic area and back portion. load;

And the above-mentioned pressure receiving member is supported by a crank member which is arranged to straddle and hang in the left and right directions of the seat back and is supported to be rotatable by means of a shaft, and is arranged laterally so that in Circular movement in the rearward direction and the upper direction is possible, and the circular movement of the crank member is transmitted to the circular movement link through the support link, becoming the circular movement of the circular movement link against the power supply.

According to at least one embodiment of the present invention, the characteristics of this at least one embodiment of the present invention are as follows:

Seat back structures for vehicle seats,

Wherein, the above-mentioned pressure receiving member is formed in a shape approximate to the letter U when viewed from the front, and has a pair of vertical shafts and a horizontal shaft that enable the pressure receiving member to receive a load from the passenger's back portion, the horizontal shaft The shaft enables the pressure receiving member to receive loads from the occupant's pelvic region.

According to at least one embodiment of the present invention, the characteristics of this at least one embodiment of the present invention are as follows:

Seat back structures for vehicle seats,

Wherein, the bracket guide is equipped with a front wall and a rear wall, the front wall and the rear wall respectively have a first support surface and a second support surface, the angle of inclination of the first support surface corresponds to the initial position of the retainer bracket in the lower part of the headrest. position, and the angle of inclination of the second support surface corresponds to the angle when the retainer bracket is in the upper part of the headrest and changes position,

Moreover, the first supporting surface and the second supporting surface of the front wall and the rear wall are alternately formed at different levels as parallel planes capable of sandwiching the retainer bracket.

According to at least one embodiment of the present invention, the left arm edge and the right arm edge of the crank member are respectively bent into a shape approximate to the letter L;

An insertion hole of a keyhole-like shape starting from a larger-diameter hole and continuously extending to a smaller-diameter elongated hole is formed on each of the left support member and the right support member, and the insertion hole The length of the hole is such that the approximate L-shaped portion of the arm edge of the crank member can be inserted into the insertion hole in the horizontal direction;

and a bushing which is designed to fit within the larger diameter hole of the insertion hole and is arranged around the arm of the crank member, and the bushing is fitted into the larger diameter hole of the insertion hole; thus, the crank member is Hold between the left support member and the right support member.

According to at least one embodiment of the invention, the bushing is formed of hard rubber or plastic and comprises in one piece its main body and flange portion, the main body being designed to fit together with the larger diameter hole of the insertion hole, and the diameter of the flange portion is greater than the diameter of the larger diameter hole;

An engaging piece that engages with the periphery of the larger diameter hole and sandwiches the support member in the space between the engaging piece and the flange portion is formed on the outer peripheral surface of the main body of the bushing.

According to at least one embodiment of the invention, the engagement members are formed at a plurality of separate locations on the outer peripheral surface of the main body of the bushing.

According to at least one embodiment of the present invention, the long hole of the insertion hole extends in a direction other than the direction in which the load is applied, and the insertion hole is formed so as not to overlap the circular movement range of the approximately L-shaped portion of the edge of the arm. s position.

3. Effects of the present invention

According to at least one embodiment of the present invention, when a rear-end collision occurs, due to the load applied by the passenger's pelvic region, the pressure receiving member circularly moves the crank member in the rearward direction and the upper direction, and simultaneously moves to the rearward direction. direction and upper direction, to circularly move the circular movement link; therefore, although at the initial start-up, the load from the pelvic region of the passenger is applied to the pressure receiving member, after the load is applied by the pelvic region of the passenger, the load is applied by the pelvic region of the passenger The load applied by the passenger's back portion acts on the pressure receiving member. Therefore, in the case of receiving the load from the pelvic area and back portion of the occupant, the pressure receiving member moves in the rearward direction and the upper direction, so that the circular moving link circularly moves to the upper changing position of the headrest ; and the headrest is smoothly moved to its upper changing position. Then, by causing the pressure receiving member to receive the load from the pelvic region and back portion of the passenger, the headrest can be continuously maintained at its upper portion changed position.

In addition to the above, since the pressure receiving member moves due to the load applied thereto from the occupant's pelvic region at the time of the initial start, no excessive load is applied to the back portion of the passenger in the initial start.

In other words, according to the configuration of at least one embodiment of the present invention, it is possible to easily realize initial activation performance (initial activation performance) and activation maintenance performance (activation maintenance performance), wherein the initial activation performance does not forcibly apply a shock load to occupant, while the startup maintains performance does not rely on loads from the occupant's pelvic region.

In addition, when a rear-end collision occurs and the pressure receiving member receives loads from the pelvic region and back portion of the passenger, the pressure receiving member can move in the rearward direction simply by connecting the pressure receiving member to a circularly movable The crank member is realized, and this helps to simplify the construction. In addition, the required members are only these two members, namely, the pressure receiving member and the crank member, and these members can be assembled simply by connecting the pressure receiving member to the circularly movable crank member; level of precision, and it can be done quickly and easily. In addition, the pressure receiving member can move in the rearward direction along with its free movement; therefore, it can move quickly, and it can have a high level of operability.

According to at least one embodiment of the present invention, when a rear-end collision occurs, due to the load applied by the passenger's pelvic region, the pressure receiving member circularly moves the crank member in the rearward direction and the upper direction, and simultaneously moves to the rearward direction. direction and upper direction, to circularly move the circular movement link; therefore, although at the initial start-up, the load from the pelvic region of the passenger is applied to the pressure receiving member, after the load is applied by the pelvic region of the passenger, the load is applied by the pelvic region of the passenger The load applied by the passenger's back portion acts on the pressure receiving member. Therefore, in the case of receiving the load from the pelvic area and back portion of the occupant, the pressure receiving member moves in the rearward direction and the upper direction, so that the circular moving link circularly moves to the upper changing position of the headrest ; and the headrest is smoothly moved to its upper changing position. Then, by causing the pressure receiving member to receive the load from the pelvic region and back portion of the passenger, the headrest can be continuously maintained at its upper portion changed position.

In addition to the above, since the pressure receiving member moves due to the load applied thereto from the occupant's pelvic region at the time of the initial start, no excessive load is applied to the back portion of the passenger in the initial start.

Since the pressing load generated by the circular movement of the crank member is applied to the circular movement link, and the circular movement of the crank member is effectively utilized, the circular movement link can be rotated more quickly and precisely, and The initial activation of the circular movement link and the continuation of the circular movement can be ensured without the impact load being forcibly applied to the passenger; Loads can be reduced.

Also according to the configuration of at least one embodiment of the present invention, it is possible to easily realize the initial start-up performance which does not forcibly apply an impact load to the passenger and the start-up maintenance performance which does not depend on the force from the passenger Loads in the pelvic area.

In addition, when a rear-end collision occurs and the pressure receiving member receives loads from the pelvic region and back portion of the passenger, the pressure receiving member can move in the rearward direction simply by connecting the pressure receiving member to a circularly movable The crank member is realized, and this helps to simplify the construction. In addition, the required members are only these two members, namely, the pressure receiving member and the crank member, and these members can be assembled simply by connecting the pressure receiving member to the circularly movable crank member; level of precision, and it can be done quickly and easily. In addition, the pressure receiving member can move in the rearward direction along with its free movement; therefore, it can move quickly, and it can have a high level of operability.

According to at least one embodiment of the present invention, since the above-mentioned pressure receiving member is formed in an approximate shape of a letter U as viewed from the front, it can effectively receive loads from the passenger's back portion and the passenger's pelvic region.

According to at least one embodiment of the present invention, since the retainer bracket can be sandwiched in contact with the surfaces of the front wall and the rear wall of the bracket guide at the lower initial position and the upper change position of the headrest, it is possible to reliably way to prevent the head restraint from being unstable.

In at least one embodiment of the present invention, all that is provided is to bend the arm edge of the crank member into an approximate letter L shape, and it is not necessary to apply a special process such as a step forming process or a circular groove forming process. Therefore, costs can be reduced.

In addition, since all that is provided is to bend the arm edge of the crank member into an approximate letter L shape, the construction is simple. Even when an excessive load is applied to the crank member, the approximately L-shaped portion of the arm edge inserted into the insertion hole of the support member locks together in the insertion hole of the support member, and thus resists the load. Therefore, even when the bush is damaged, the above configuration prevents the arm from falling out of the insertion hole of the supporting member.

In addition, a bush provided around the arm of the crank member is fitted into the larger diameter hole of the insertion hole, and this prevents the approximately L-shaped portion located in the larger diameter hole from moving in the direction of the long hole. Therefore, under normal conditions where no excessive load is applied, the arm does not fall out of the insertion hole.

In at least one embodiment of the present invention, the support member can be sandwiched in the space between the flange portion of the bush and the joint, and the bush is formed of hard rubber or plastic; The crank member is supported while smooth circular movement of the crank member is ensured.

In at least one embodiment of the present invention, the engaging piece takes a segmented shape; therefore, the main body of the bush can be easily deformed, and thus, the bush can be smoothly fitted into the larger diameter hole of the insertion hole.

In at least one embodiment of the present invention, the approximately L-shaped portion of the edge of the arm does not slide into the long hole portion of the insertion hole, nor line up with the long hole. Therefore, the arm can be held at a predetermined position, and the arm can be prevented from falling out of the insertion hole.

Brief description of the drawings

1 is a vertical cross-sectional view of a seat back structure of a vehicle seat used for one working example (working example 1) of the present invention in a lower initial position of a headrest.

2 is a partially cutaway perspective view of a seat back structure for a vehicle seat in a lower initial position of a headrest.

3 is a vertical cross-sectional view of a seat back structure for a vehicle seat at an upper changing portion of a headrest.

4(A)(B) respectively constitute a perspective view and a vertical cross-sectional view of the bracket guide.

5 is a partially cutaway vertical enlarged cross-sectional view of a seat back structure for a vehicle seat in an upper changed position of a headrest.

Fig. 6 (A) (B) is the vertical transverse view of the seat back structure of the vehicle seat used in another working example (working example 2) of the present invention in the lower initial position and the upper changed position of the headrest, respectively. Sectional view.

7 is a partially cutaway perspective view of the seat back structure for a vehicle seat in the lower initial position of the headrest.

8(A) to (C) are a set of skeletal process figures (skeletal process figures) of a working example (working example 3) of the present invention utilizing a lumbar support (lumbar support) as a crank member, which shows a crank How components are maintained.

FIG. 9 is a skeleton diagram of a retaining structure of a working example of the present invention utilizing a lumbar support as a crank member.

Fig. 10 is a partial view of the holding structure showing the relationship between the insertion hole and the approximately L-shaped portion.

11(A)(B) are front view and perspective view of the bushing, respectively.

12 is a front view illustrating a seat back structure with a lumbar attachment for a vehicle seat.

FIG. 13 is a cross-sectional view of the seat back structure of FIG. 12 .

FIG. 14 is an enlarged portion of a cross-sectional view of the seat back structure of FIG. 13 .

Fig. 15 is a sectional view taken along line A-A in Fig. 12 .

16 is a rear perspective view of the seat back structure of FIG. 12 .

FIG. 17 is an enlarged portion of the rear perspective view of FIG. 16 .

Fig. 18 is a front view of a working example (working example 4) of a seat back structure with a lumbar attachment for a vehicle seat.

Fig. 19 is a front view of a working example (working example 5) of a seat back structure with a lumbar attachment for a vehicle seat.

Detailed Description of Embodiments of the Invention

As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in different and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for the claims and/or as a representative basis for teaching one skilled in the art to variously employ the present invention.

Embodiments of the present invention are constructed in the following manner: the pressure receiving member is designed as a vertically disposed pressure receiving member capable of receiving loads from the passenger's pelvic area and back portion; The pressure receiving member circularly moves the crank member in the rearward direction and the upper direction, and simultaneously moves in the rearward direction and the upper direction to circularly move the circular movement link; therefore, After the load is applied by the occupant's pelvic region, the load applied by the occupant's back portion is also acted on the pressure receiving member.

In at least one embodiment of the present invention, the arm edge of the crank member is bent into an approximate shape of a letter L, and a bush provided around the arm is fitted into the insertion hole; thus, the crank member is held in a circular movement. between support members.

working example 1

Figures 1 and 2 are a vertical cross-sectional view and a partially cut-away perspective view, respectively, of a seat back structure of a working example of the present invention in the lower initial position of the headrest, while Figure 3 is in the upper changed position of the headrest A vertical cross-sectional view of the above-mentioned seat back structure.

As shown in FIGS. 1 and 3 , the seat back 10 is constructed such that it is equipped with a so-called emergency start headrest 12 . When a rear-end collision occurs and the headrest 12 receives a load caused by the transfer of the occupant's inertia in the rearward direction, the headrest 12 transitions from the lower initial position shown in FIG. 1 to the upper changed position shown in FIG. 3 .

In addition, FIG. 3 shows the lower initial position with a dotted line and the upper changed position with a solid line, and the headrest 12 is tilted forward and moves in a circular arc as indicated by the arrow to change its position.

As shown clearly in Fig. 1 and Fig. 3 and Fig. 2, a pair of left circular moving link and right circular moving link 14 of approximate letter L shape are respectively installed so that the support pin (swing- Supporting pins) 16 swing on, for example, link brackets 19 on the left and right side members 18a of the seat back frame 18. In addition, the support shaft 20 is provided so as to be suspended across the edges corresponding to the left circular moving link and the right circular moving link 14, and is supported to be rotatable through the shaft; therefore, the supporting shaft 20 is laterally Arranged so as to move circularly in its upper and lower directions as the circular movement link moves circularly.

Furthermore, in FIG. 2, the right circular moving link 14 is hidden under the right side member 18a in the figure.

The column holder bracket 24 is inserted into the pillar 22 of the headrest 12, and is supported by the pillar 22 of the headrest 12, and its lower edge is fixed on the support shaft 20; The bracket guide 26 on the upper member 18b of the upper member 18b is free to slide in contact with the bracket guide and to tilt freely. Therefore, when the circular moving link 14 and the support shaft 20 move circularly, the holder bracket 24 can be tilted forward, and the bracket guide 26 acts as a fulcrum; when the holder bracket is tilted forward, the headrest 12 is supported such that it can be transferred from its lower initial position to its upper altered position while tilting forward.

In this working example, when the cross-sectional view of the rectangular shape of the column is viewed from the side, the holder bracket 24 is formed close to the Japanese hiragana letter KU (like the alphabet letter V turned sideways with its open end facing the right). shape, and the strut 22 of the headrest is inserted through the upper edge of the retainer bracket via the strut retainer 28 .

In addition, the strut holder 28 is inserted into the upper half 24a of the holder bracket 24 in a fixed manner, and supports the strut 22 by a locking mechanism at arbitrary upper and lower points. The configuration of the strut holder is not essential to the present invention but is a well-known configuration; therefore, its detailed description is omitted.

As best shown in FIG. 2 , the upper half 24 a of the holder bracket 24 is inserted into the bracket guide 26 .

4(A) and (B) show a perspective view and a vertical cross-sectional view of the bracket guide, respectively.

4 (A) and (B), the bracket guide 26 is equipped with a front wall 28f and a rear wall 28r, and these walls each have a first support surface 28a and a second support surface 28b, wherein the first support The angle of inclination of the surface 28a corresponds to the angle of the holder bracket when the headrest is in the lower initial position, and the angle of inclination of the second support surface 28b corresponds to the angle of the holder bracket when the headrest is in the upper changed position. In addition to the above, the first support surfaces 28a and the second support surfaces 28b of the front and rear walls alternately form parallel planes at different heights, which can sandwich the holder bracket. Therefore, the holder bracket is supported at the lower initial position and the upper changed position of the headrest 12 by being sandwiched by the front wall and the rear wall.

Because the bracket guide 26 is constructed as a wall as described above, as shown in FIG. The surfaces of the wall and the rear wall are in contact, so that the bracket guide 26 supports the headrest 12 so that the headrest 12 can be prevented from becoming unstable in a reliable manner.

A downward hook (downward hook) 26a is formed by providing a groove (like a slightly elongated rectangle in the horizontal direction with the left side cut off) on the left side wall and the right side wall of 26 in a shape approximate to the Japanese katakana KO On the left and right side walls, and around, a circumferential step 26b is formed around the bracket guide below the hook so as to face the hook. Due to the above arrangement, the bracket guide 26 is locked in a fixed manner with the upper member of the seat back frame by sandwiching the seat back frame 18b between the downward hook 26a and the surrounding annular step 26b.

As explained above, since the support shaft 20 is supported on the left circular movement link and the right circular movement link 14 in a movable manner in the upper direction and the lower direction, when the support shaft moves in the upper direction and the lower direction, direction, while the circular movement link moves circularly, the position of the head restraint 12 changes between its upper position and its lower position. In addition, when the support shaft 20 moves in an arcuate movement in the upper direction and the lower direction due to the swing support pin 16 of the circular moving link acting as a fulcrum, the headrest 12 functions as a fulcrum due to the bracket guide 26 The effect of tilting forward and backward (see Figure 1, Figure 3 and Figure 4 (B)).

As clearly shown in FIG. 2 , in this working example, the stopper 19 a is bent in a substantially perpendicular manner from the link bracket 19 and protrudes on the circular movement path of the circular movement link 14 . With the above arrangement, due to the latching effect (latching effect) produced by the stopper 19a, at the lower initial position of the headrest 12, the circular movement of the circular movement link 14 is controlled.

For the circular moving link 14 , the energy supply device 30 gives a power supply as a force that energizes the headrest 12 in the direction in which the headrest 12 is in its lower initial position. In other words, the headrest 12 is energized by the energy supply provided by the energy supply device 30 when it is in the direction of its lower initial position.

In this working example, the energy supply device 30 is embodied as a tension coil spring arranged to be suspended on the circular moving link 14 and the left and right side members 18a of the seat back frame. In addition to the above, the upper edge 30a of the tension coil spring is locked in the locking hole of the circular moving link 14 above the support shaft 20, and the lower edge 30a of the tension coil spring is locked in the seat back frame. The left and right side members 18a are provided in locking holes below the support shaft 20; thus, feeding force is applied to the circular moving link 14 in the direction of the lower initial position of the headrest.

In other words, in FIG. 2 , the feeding force is applied to the circular moving link 14 by the energy supply device 30 (extension coil spring), which makes the circular moving link 14 rotate clockwise around the swing support pin 16. Move in a circle.

The seat back structure equipped with this type of emergency start headrest 12 is constructed so that, when a rear-end collision occurs, the load resistance supply capacity due to the transfer of inertia in the rearward direction (by the force of the tension coil spring) The force provided by the spring), so that the circular moving link 14 is circularly moved to the upper part of the headrest to change position. In other words, the seat back 10 is constructed such that, when a rear-end collision occurs, the load caused by the transfer of the passenger's inertia in the rearward direction is received by a predetermined pressure receiving member, and the load is transmitted and applied to the circular The circular moving link 14 becomes a circular moving force in the direction of changing the position of the upper part of the headrest against the power supply provided by the energy supply device 30 .

In this working example, the pressure receiving member 34 can receive loads from the pelvic region and back portion of the passenger, and it is provided in the seat back 18; The pressure receiving member extending downward in such a manner that it is fixed to the support shaft by means of an adhesive or the like through its upper edge. Therefore, it can move in response to the support shaft, and it can receive loads from the passenger's pelvic area and back portion.

The pressure receiving member 34 is preferably formed, for example, with a bar-shaped member provided in a downwardly extending manner, or, for example, with a bar-shaped member capable of Rigidity that makes the pressure receiving member press the support shaft 20, and flexibility that enables the pressure receiving member to bend.

As clearly shown in FIG. 2, the pressure receiving member 34 is formed in an approximate U-shape, which has a pair of vertical shafts 34a and a horizontal shaft 34b as seen from the front, and the pair of vertical shafts 34a are passed through bent rods. The member is formed with a width enabling the pressure receiving member to receive the load from the passenger's back portion, and the horizontal shaft 34b connects the pair of vertical shafts 34a at a lower position of the pair of vertical shafts 34a. The horizontal shaft 34b functions to receive the load from the pelvic region of the passenger, and is provided at a position where load from the passenger caused by the transfer of inertia in the rearward direction when a rear-end collision occurs can be received. The load for the pelvic region is, for example, disposed laterally near the center of the seat, spaced approximately the same distance from the left and right side members 18a of the seat back frame.

In this working example, because the width of the lower half 34a2 of the pair of vertical shafts 34a is designed to be narrower than the width of the upper half 34a1, and the horizontal shaft 34b is designed to be narrower than the distance between the pair of vertical shafts 34a Narrow, therefore, the loads from the passenger's pelvic area can be received by the horizontal shaft in a safe manner. Furthermore, since the pressure receiving member 34 is formed by bending a rod-shaped member, the pressure receiving member can be easily formed.

The pressure receiving member 34 is connected with a crank member 36 at a step 34a3 located at the lower half of 34a, and where the width between the pair 34a changes. The pressure receiving member 34 is connected to the crank member 36, and by covering the step 34a of the pressure receiving member and the crank member 36 with the columnar member 35, the crank member is allowed to perform circular movement.

Support holes 18a1 are respectively formed on the left and right side members 18a of the seat back frame. By having the curved left and right edges 36a of the crank member 36 rotatably supported in the support hole, the crank member is arranged to be suspended across the left and right side members of the seat back frame, And thus arranged in a rearward direction and an upper direction in such a manner that a circular movement is possible.

Generally, in a normal driving posture of a passenger, most of the pelvic region of the passenger is in contact with the seating surface of the seat back, while a portion of the passenger's back tends to separate from the seating surface of the seat back. Because of the above-mentioned tendency, when the transfer of inertia in the rearward direction is applied by a rear-end collision, pressing of the occupant's pelvic region on the horizontal shaft 34b of the pressure receiving member occurs earlier than pressing on the vertical shaft 34a of the pressure receiving member .

When a rear-end collision occurs, the occupant's pelvic region moves in the rearward direction due to the transfer of inertia in the rearward direction, and the resulting pressure then acts on the horizontal axis 34b of the pressure receiving member, the pressure receiving member 34 rests on the seat moves in the rearward direction, while the crank member 36 moves in a circle. Pressure applied to the pressure receiving member 34 acts on the support shaft 20 to which the upper edge of the pressure receiving member is fixed, so that the circular moving link 14 moves circularly in the counterclockwise direction shown in FIG. 1 . When the pressure exceeds the supply capacity provided by the energy supply device 30, the pressure receiving member lifts the support shaft.

When the pressure-receiving member lifts the support shaft against the energizing force provided by the energizing device 30 , the circular movement links 14 start their circular movement towards the upper part of the headrest to change position.

As explained above, since the circular movement link 14 is actuated by the input of load from the passenger's pelvic region, the influence of the impact load acting on the passenger's back portion is reduced when the circular movement link is actuated. up.

Furthermore, although the shifting stroke of the occupant's pelvic region to the pressure receiving member 34 is relatively short when the transfer of inertia in the rearward direction occurs, the pressure it applies to the pressure receiving member is sufficiently strong. Because of the above, when the pressure of the load from the occupant's pelvic region is applied, the circular movement link 14 is smoothly activated, and thus, the influence of the impact load acting on the occupant can be sufficiently reduced.

Further, after the activation of the circular movement link 14, as the pressure receiving member 34 moves due to the load in the backward direction from the passenger's pelvic region, the circular movement link continuously moves circularly to the upper part change position of the headrest; And as the vertical shaft 34a of the pressure receiving member is pressed due to the transfer of inertia in the rearward direction from the passenger's back portion, the pressure receiving member moves in the rearward direction. Because of the above action, the circular moving link 14 is continuously circularly moved to the upper changing position of the headrest without being delayed.

In other words, after the activation of the circular movement link 14, as the load from the occupant's pelvic region and back portion is applied, the circular movement of the circular movement link 14 to change position toward the upper part of the headrest continues, and The head restraint is kept in the upper changing position by the load.

Since the circular movement of the circular moving link 14 is initiated by the load from the pelvic region of the passenger, the shock load generated when the passenger's back portion presses the pressure receiving member 34 is certainly reduced. Also based on this point of view, the initiation and continuation of the circular movement can be ensured without forcing the occupants to experience shock loads.

Since the pressure receiving member 34 is constructed to receive loads from the occupant's pelvic area and back portion, even when the load from the occupant's pelvic area is not applied to the pressure receiving member 34 in the correct manner, the load from the occupant's back portion The load will also be received in the correct manner by the pressure receiving member 34; thus, causing the circular moving link 14 to move circularly and causing the head restraint 12 to shift to the upper changing position, which further increases the likelihood that the head restraint will be emergency activated. Certainty.

In this regard, if the passenger's back portion is greatly sunk into the seating surface of the seat back due to the shift of inertia in the rearward direction, the pressure applied to the pressure receiving member 34 by the passenger's pelvic area may be due to the posture. changed to be lowered.

However, the circular moving link 14 is supported at the upper portion of the headrest to change position against the power supply provided by the energy supply device 30, in other words, when the vertical shaft 34a of the pressure receiving member is loaded by the back portion of the passenger. When pressed, the headrest 12 is supported in an upper change position, wherein the load from the passenger's back portion is caused by the transfer of the inertia of the passenger's back portion in the rearward direction; therefore, in addition to having to rely on the load from the pelvic area of the passenger In addition, it is still possible to change the position while maintaining the head restraint in the upper part. Therefore, initial start performance which does not forcibly apply an impact load to the occupant and start maintenance performance which does not depend on the load from the pelvic region of the occupant can be easily realized.

Furthermore, when a rear-end collision occurs and the pressure receiving member receives a load from the passenger's pelvic region and back portion, the pressure receiving member can move in the rearward direction simply by connecting the pressure receiving member 36 to a circular This is achieved by moving the crank member 36, which helps to simplify construction. In addition, the required components are only these two components, namely, the pressure receiving member 34 and the crank member 36, and these components can be assembled simply by connecting the pressure receiving member 34 to the circularly movable crank member 36; Assembly does not require a high level of precision, and it can be performed quickly and easily. In addition, the pressure receiving member 34 can move in the rearward direction according to free movement without being guided or restricted by a guide member equipped with a guide hole; therefore, it can move quickly and can have a high level of operability .

The pressure receiving member 34, which functions to receive loads from the passenger's pelvic region and back portion, is formed of a rod-shaped member having flexibility; therefore, when a load is applied from the passenger's pelvic region and back portion, the pressure receiving member bends, And this bending reduces the impact load applied to the passenger's pelvic region and back portion.

Incidentally, as a restoring force, the power supply provided by the energy supply device 30 is continuously applied to return the headrest to the lower initial position; Hold on top to change position.

Fig. 5 is a partially cutaway enlarged vertical cross-sectional view of the seat back structure in the upper changing position of the headrest.

In the upper change position, torque T1 (=P1×L1) and torque T2 (=P2×L2) respectively act on the supporting shaft, and torque T1 (=P1×L1) acts to make the circular moving link 14 in its operating direction (counterclockwise direction as shown in FIG. 5 ), and the torque T2 (=P2×L2) acts to make the circular moving links 14 return to their original direction (as shown in FIG. 5 ). clockwise as shown).

P1: Load in the operating direction caused by the passenger moving to the rearward direction.

L1: distance between the swing support point (swing support pin 16) and the support shaft in a direction perpendicular to P1.

As shown in FIG. 5, when the circular moving link 14 is circularly moved to change the position of the headrest 12 to the upper changing position, L2 becomes much smaller than L1 (L2<<L1), and therefore, returns The torque in direction 2 becomes very small as shown below:

T2<<T1

In other words, changing the position at the upper part of the headrest can provide resistance against the power supply capacity provided by the power supply device 30 even with a relatively small force; and the load on the back portion is equal to or higher than a predetermined value, the headrest 12 can be kept at the upper change position. Therefore, it becomes possible to securely hold the headrest 12 at the upper changing position, and to obtain a high level of holding performance.

When the circular movement link 14 is further circularly moved and the line of force of P2 exceeds the swing support pin 16, the torque T2 no longer acts as a torque for the return direction, but becomes a torque for the operation direction; therefore, the head Pillow 12 is held securely in the upper altered position.

Furthermore, in this working example, the energy supply device is arranged in such a way that in the vicinity of the rocking support point of the circular moving link 14 when the upper part of the headrest is in a changed position, the energy supply device consisting of a tension coil spring The line of force of the energy device 30 is located between the rocking support point (the rocking support 16 ) and the support shaft 20 . When the energy supply device 30 is arranged according to the above-mentioned manner, the efficiency of transferring power supply is intentionally lowered at the upper part changing position; therefore, the return initiating power of the headrest 12 from the upper part changing position can be safely reduced. .

As explained above, the holder bracket 24 is supported relative to the bracket guide 26 provided on the upper member 18b of the seat back frame so as to freely slide in contact with the bracket guide and to freely tilt. In addition, the lower edge of the holder bracket 24 is fixed on a support shaft 20 which is arranged to be suspended across the pair of left and right circular moving links 14 and is arranged to Can be rotated. Therefore, when a rebound load (rebound load) generated by a rear-end collision is input into the headrest 12, the component force F of the load, as shown in FIG. 5, acts on the swing support point of the circular moving link (Swing support pin 16) on the upper side. In other words, the component force F of the above load will act as a force to circularly move the circular movement link 14 to the upper changing position to circularly move the circular movement link 14 in the counterclockwise direction near the rocker support 16. The link 14 is moved; therefore, the head restraint 12 does not return to its lower initial position due to the rebound load.

In addition, on the front panels of the pressure receiving member 34 and the crank member 36, for example, a flexible support plate and an S spring are provided, and the flexible support plate is supported on the left side member of the seat back frame in a flexible manner through a tension coil spring or the like. Between the seat back frame and the right side member, S springs are arranged to straddle and hang on the left side member and the right side member of the seat back frame, and they are not shown in the figure in order to avoid complicating the drawing. The support plate and S-springs are arranged to cover their front panels, thereby leaving a space between the pressure receiving member 34 and the crank member 36; because of this space, when seated, the pressure receiving member does not receive pressure caused by subsidence. load.

working example 2

6(A) and FIG. 7 are vertical cross-sectional views showing a seat back structure of a vehicle seat for another working example (working example 2) of the present invention in the lower initial position of the headrest, respectively. and a partially cut-away perspective view, while FIG. 6(B) shows a vertical cross-sectional view of it in the upper changed position of the headrest. Here, FIG. 6(A), FIG. 7 and FIG. 6(B) correspond to FIG. 1 , FIG. 2 and FIG. 3 in Working Example 1, respectively.

Working Example 2 differs from Working Example 1 only in that the crank member is arranged to be suspended across a pair of left and right support links, and the rest of the components are the same as in Working Example 1 above. Therefore, only the differences are described below.

A pair of support links 40 are provided to connect the crank member 36 and the circular moving link 14 and to transmit movement of the crank member to the circular moving link 14 .

As clearly shown in FIGS. 6(A)(B) and 7, for example, the pair of support links 40 is formed by combining a first link 41 at an upper position and a second link 42 at a lower position. In addition to the above, the upper edge of the first link 41 is installed on the circular moving link 14 by means of a swing support pin 41a so as to be able to swing, and the lower edge of the second link 42 is installed on the circular moving link 14 by means of a swing support pin 42a. side member 18a of the seat back frame so as to be able to swing, and the facing edges of the first link and the second link are connected together by means of a swing support pin 41b so as to be able to swing. In this way, the upper edge of the support link 40 (the upper edge of the first link 41 ) is made movable in the upper direction and the lower direction.

The edge 36 a of the crank member is installed so as to be rockable on a support hole 41 c formed on the first link 41 . A guide 41d is provided on the first link 41, and the edge 36a of the crank member is sandwiched by a guide groove 41d1 formed in the guide.

With this configuration, when 34 is moved due to the circular movement of the crank member 36 in the rearward direction, the crank member presses the guide 41d to lift up the first link 41 . Due to the above actions, pressure (pressure in the operating direction) is applied from the support link 40 to the circular movement link, thereby acting to change the position in the counterclockwise direction (pointing to the upper part of the headrest) as shown in FIG. 6(A). direction), in the vicinity of their rocking support points (rocking support pins 16), the action of circularly moving the circular moving links 14 against the power supply provided by the energy supply device 30.

In other words, what is used in the above working example 1 is the pressure caused by the backward movement of the pressure receiving member 34 through the support shaft 20 to make the circular moving link 14 in the direction in which the upper part of the headrest changes position Move in a circle. In this working example (working example 2), in addition to the above-mentioned pressure, the circular movement of the crank member 36 is generated by the backward movement of the pressure receiving member 34, and the pressure generated in the operating direction is passed through the support link 40 applied to the circular travel link.

In this way, in a configuration in which the pressure generated by the circular movement of the crank member 36 is applied to the circular movement link 14 to more effectively utilize the circular movement of the crank member 36, the circular movement link can be achieved. Rapid and safe circular movement, activation of the circular movement linkage and continuation of the circular movement can be ensured without imposing shock loads on the passenger. In addition, when applying pressure, it is possible to reduce the impact load applied to the pelvic region and back portion of the occupant.

In addition, the support links 40 are not limited by the configuration shown in the drawings as long as they can apply the circular movement of the crank member 36 to the circular movement link 14 as pressure in the operating direction. For example, the guide 41d1 may take any form as long as it lifts the support link 40 when the circular movement of the crank member 36 is applied, and circularly moves the circular moving link 14 in the operating direction.

According to at least one embodiment of the present invention, when a rear-end collision occurs, due to the load applied by the passenger's pelvic region, the pressure receiving member circularly moves the crank member in the rearward direction and the upper direction, and at the same time and the upper direction to move the circular moving link circularly; therefore, although the load from the occupant's pelvic area is applied to the pressure receiving member at the initial start-up, after the load is applied by the occupant's pelvic area, The load applied by the passenger's back portion is also acted on the pressure receiving member. Because of the above, in the case of receiving the load from the pelvic area and back portion of the passenger, the pressure receiving member moves in the rearward direction and the upper direction, so that the circular moving link circularly moves to the upper part of the headrest The position is changed, and the headrest is smoothly transferred to its upper changed position. Then, by causing the pressure receiving member to receive the load from the pelvic region and back portion of the passenger, the headrest can be continuously maintained at its upper portion changed position.

In addition to the above, since the pressure receiving member moves due to the load applied thereto from the occupant's pelvic region in the initial actuation, no excessive load is applied to the back portion of the occupant in the initial actuation.

In other words, according to the configuration of at least one embodiment of the present invention, it is possible to easily realize the initial start-up performance which does not forcibly apply a shock load to the passenger and the start-up maintenance performance which does not rely on Loads from the passenger's pelvic area.

In addition, when a rear-end collision occurs and the pressure receiving member receives loads from the pelvic region and back portion of the passenger, the pressure receiving member can move in the rearward direction simply by connecting the pressure receiving member to a circularly movable The crank member is realized, and this helps to simplify the construction. In addition, the required members are only these two members, namely, the pressure receiving member and the crank member, and these members can be assembled simply by connecting the pressure receiving member to the circularly movable crank member; level of precision, and it can be done quickly and easily. In addition, the pressure receiving member can move in the backward direction according to free movement, and therefore, it can move quickly and can have a high level of operability.

working example 3

The following is a description of at least one embodiment of the invention, using the accompanying drawings by way of reference. Here, FIGS. 8(A) to (C) and FIG. 9 respectively constitute a set of skeleton process diagrams of a working example (working example 3) utilizing a lumbar support as a crank member of the present invention, and a skeleton diagram of a holding structure, Wherein the set of skeleton process diagrams shows how the crank member is held.

In Figures 8 and 9, the crank member is embodied as a crank-shaped lumbar support. As shown in FIG. 9 , a lumbar support member (crank member) 112 is installed in a circular movement on side frames 122L and 122R of a seat back frame 122 for a vehicle seat at a position supporting the lumbar spine of a seated person. (Supporting members), play a role in relieving fatigue. The application of the present invention to the lumbar support is just an example, the construction of the lumbar support itself is well known, and it does not constitute the essence of the present invention; therefore, its detailed description is omitted.

The lumbar support 112 is formed into a crank shape by bending a solid bar made of steel, for example, which is repeatedly located on the left and right sides, respectively, and which includes a horizontal central portion 112c, a central portion 112c, and a left (or right) edge A slope 112b between the arms, and horizontal arms 112a1 and 112a2. In addition, the left and right edges of the arm 112a1 and the arm 112a2 are bent into an approximate letter L shape. For example, the edges of the arms 112a1 and 112a2 are bent approximately 90° in the downward direction.

Lumbar support 112 is generally formed from a rod material having the same diameter throughout its entire length; however, it may be formed from rods having different diameters, as desired.

A keyhole-shaped insertion hole 124 starts from a larger-diameter hole 124a and continuously extends to a smaller-diameter elongated hole 124b, which is formed in a supporting member, that is, a seat back frame 122 for a vehicle seat. on each of the side frames 122L and 122R. Here, the length of the insertion hole 124 is formed such that the approximately L-shaped portions 112a'1 and 112a'2 of the arm of the lumbar support can be inserted into the insertion hole in a substantially horizontal direction. In other words, in FIG. 8(A), the length h1 in the vertical direction of the insertion hole 124 is greater than the length h2 in the vertical direction of the approximately letter L-shaped portion 112a'1; and the elongated hole 124b of the insertion hole The width (diameter) d1 is larger than the diameter d2 of the arm 112a1.

Fig. 10 is a partial sectional view of the holding structure showing the relationship between the insertion hole and the approximately L-shaped portion.

As shown in FIG. 10, the insertion hole 124 is formed so that the elongated hole 124b extends in a direction other than the direction in which the load is applied, and the elongated hole 124b is formed in a portion 112a'1 other than the approximately L-shaped portion 112a' of the edge of the arm. The position where the circular movement range A overlaps. In this working example, the elongated hole 124b extends in the upper direction in a substantially vertical manner.

In other words, in the lumbar support 112, the load F acts in a substantially horizontal direction from the front of the seat to the rear of the seat as indicated by the arrow. However, since the long hole 124b of the insertion hole does not extend in a substantially horizontal direction, the arm 112a1 does not slide off from the larger-diameter hole 124a, which makes it possible to hold the arm at a predetermined position.

As long as the approximately L-shaped portion 112a'1, which is a part of the arm 112a1, is also circularly moved to the position shown by the dotted line in accordance with the circular movement of the lumbar support 112, the long hole 124b of the insertion hole will not be located at its Within the circular movement range A. Therefore, the approximately L-shaped portion 112a'1 and the elongated hole 124b are never aligned, and therefore, the approximately L-shaped portion does not come off from the elongated hole.

In this working example, the insertion hole 124 is constructed such that the elongated hole 124b extends in the upper direction in a substantially vertical manner. However, as long as the elongated hole 124b extends in a direction other than the direction in which the load is applied to the lumbar support, and as long as the elongated hole 124b is not located within the circular movement range of the approximately L-shaped portion 112a'1 of the arm edge The position where A overlaps is enough; therefore, the direction in which the long holes can extend is not limited to the upper direction.

Next is a description of how the left arm 112a1 of the lumbar support is supported by the left side frame (support member) 122L of the seat back frame, using FIGS. 8(A) to (C) as a reference. Also, needless to say, the manner in which the left arm 112a2 of the lumbar support is supported by the left side frame (support member) 122R of the seat back frame is the same as that shown in FIGS. 8(A) to (C).

As described above, the approximately letter L-shaped portion 112a'1 is inserted into the insertion hole 124, and it is formed on the edge of the arm 112a1 of the lumbar support by bending the lumbar support 112.

As shown in FIG. 9(A), an approximately letter L-shaped portion 112a'1 is formed on the edge of the arm 112a1, and is aligned with the insertion hole 124 in a substantially horizontal direction, and the approximately letter L-shaped portion 112a'1 is then formed. Move horizontally so as to be inserted into the insertion hole as indicated by the arrow.

Thereafter, as shown by the arrow in FIG. 8(B), the arm 112a1 is moved downward to reach the larger-diameter hole 124a of the insertion hole. As shown in FIG. 8(C), the bushing 130 is disposed around the arm at the larger diameter hole of the insertion hole so that the arm is supported in the insertion hole.

Figure 9(A)(B) respectively constitute the front view and perspective view of the bushing.

As shown in FIG. 9(A)(B), the bush 130 is formed by integrating a main body 130a and a flange portion 130b having a larger diameter than the main body. The body is designed to fit together with the larger diameter hole 124a of the insertion hole. In addition, engaging pieces 130c are formed on the outer peripheral surface of the main body 130a.

When the main body 130a of the bushing fits into the larger diameter hole 124a of the insertion hole, the engagement piece 130c engages the periphery of the larger diameter hole and acts to sandwich the side frame 122L between the engagement piece and the flange portion 130b so that the bushing The cover will not fall off. In this working example, the two joints 130c are arranged at positions 180° apart from each other.

For example, the engaging piece 130c is formed in a slope-like shape in which the height increases on a side closer to the flange 130b, and a space is left for providing a groove 130c' at which the side frame 122L is pressed. Sandwiched between the edge surface facing the flange portion and the flange portion with little play.

As long as the bushing 130 fits together with the larger diameter hole 124a of the insertion hole without the bushing coming off, the engaging member 130c is sufficient to function without being limited by the shape shown in the figure. For example, the number of joints is not limited to two, but it may be three or more. In addition, as long as the shape of the engaging piece 130c is in the form of a groove 130c' at which the side frame 122L is sandwiched between the edge surface facing the flange portion and the flange portion with little play, the engaging Part 130c will work adequately. In addition to the segmented shape, the engaging member 130c may take the shape of a frustocone having a circular groove capable of sandwiching the side frame.

However, when the engaging member 130c is formed in a segmented shape and provided at a plurality of spaced locations on the periphery of the bush main body 130a, as shown in the figure, the bush main body becomes easily deformed. ; Therefore, the bushing 130 can be fitted more smoothly with the larger diameter hole 124a of the insertion hole.

On the outer side of the frame 122L, the bushing nut 130 fits together with the approximately L-shaped portion from the edge of the approximately L-shaped portion 112a'1, while the flange 130b faces outward; the bushing nut 130 is along the approximate letter L The shaped part slides until it reaches the arm 112a1; and then, the engaging piece 130c formed on the periphery of the main body is pressed against the larger diameter hole 124a of the insertion hole. Then, the main body 130a is deformed, inserted into the larger diameter hole 124a and fitted together with the larger diameter hole 124a; the joints 130c then return to their original shape and fit tightly with the periphery of the larger diameter hole so that the side frames 122L are clamped in In the groove 130c' between the flange portion 130b and the engaging member.

Similarly, the right side frame 122R of the seat back frame is also sandwiched by the bushing 130 .

By making the left side frame 122L and the right side frame 122R sandwiched by the bushing 130 fitted in the larger diameter hole 124a of the insertion hole, the left arm 112a1 and the right arm 112a2 of the lumbar support move freely in a circle is supported by the insertion hole 124 in such a manner, and the lumbar support 112 (crank member) is supported by the left side frame and the right side frame (support member) in such a manner as to freely move circularly.

In addition, when the edges of the arms 112a1 and 112a2 of the lumbar support are bent into an approximate shape of a letter L, approximately L-shaped portions 112a'1 and 112a'2 are formed. Therefore, for the arm edge, it becomes unnecessary to provide a special process such as a step forming process or a circular groove forming process, which makes it possible to reduce the cost.

In addition, even when an excessive load is applied to the lumbar support member 112, the approximately L-shaped portions 112a'1 and 112a'2 on the edge of the arm that are inserted into the insertion holes 124 of the side frames are also received by the insertion holes of the support member. Locked and able to resist load. Therefore, even when the bush 130 is damaged, the arm does not come off from the insertion hole. In other words, although the configuration is so simple that it can be simply realized by bending the edges of the arms 112a1 and 112a2, the holding structure can resist the load and completely prevent the arms from falling out of the insertion hole 124.

Because the bushing 130 surrounding the left arm 112a1 and the right arm 112a2 of the lumbar support fits together with the larger diameter hole 124a of the insertion hole, the approximately L-shaped portion located in the larger diameter hole is prevented from being inserted into the long hole. direction of movement. Therefore, the arms 112a1 and 112a2 do not come off from the insertion hole 124 under normal use in which no excessive load is applied.

Even when the edges of the left arm 112a1 and the right arm 112a2 of the lumbar support are formed in an approximate letter L shape, since the insertion holes 124 into which the approximately letter L-shaped parts 112a'1 and 112a'2 are inserted are provided on the side frame 122L and 122R, so the inserting operation can be performed smoothly. In addition, by simply installing the bush 130, the arms 112a1 and 112a2 are supported by the insertion hole 124 in a manner of freely circularly moving, and thus, the bush can be easily installed. Therefore, any operation requiring a special tool becomes unnecessary, which increases operability.

Bushing 130 may be formed from metal, hard rubber, plastic, or other materials. However, when the bush 130 formed of hard rubber or plastic is used, it has an appropriate degree of flexibility; therefore, it becomes possible to provide support without rattling or noise while maintaining a smooth circular movement.

When the bushing 130 is designed to constitute a split bushing with a slit, the bushing 130 can be installed not by the edges of the approximate L-shaped portions 112a'1 and 112a'2, but by the approximate L-shaped part or appropriate position on the arms 112a1 and 112a2, which further increases operability.

Working Example 4

12-17 illustrate Working Example 4, which is a further development of Working Example 1. FIG. 12 and 13 illustrate the seat back 10 with the lumbar attachment 200 . The lumbar attachment 200 is connected to the pressure receiving member 34 to provide lumbar support to the occupant and to provide a target for emergency activation of the head restraint 12 . The lumbar attachment 200 has a generally rectangular perimeter as shown in FIG. 12 while having a generally contoured seatback profile as shown in FIG. 13 . The lumbar attachment 200 is formed from a grid-like pattern of support members forming rows and columns with a series of trusses therebetween. During a crash environment, the trusses gather in the lower region associated with the input forces. The waist attachment 200 may be formed of high-strength plastic or the like.

A pair of tension coil springs 202 are mounted to the upper lateral sides of the waist attachment 200, respectively, and to one of the side members 18a, so as to support the upper region of the waist attachment 200 while providing support for the position of the upper portion of the waist attachment 200. compliance.

Referring to FIGS. 14-17 , the lower portion of the waist attachment 200 includes a pair of retaining hooks 204 for connection to the lower horizontal shaft 34 b of the pressure receiving member 34 . During assembly, the beveled edge of the retaining hook 204 is pressed against the horizontal shaft 34b such that the hook 204 is deformed until the horizontal shaft 34b is held against the abutment edge of the retaining hook 204 . As shown in FIG. 17 , the waist attachment 200 is further provided with a pair of laterally spaced ribs 206 , wherein each laterally spaced rib 206 is disposed on opposite lateral sides of the lower half 34 a 2 of the vertical shaft 34 a of the pressure receiving member 34 . superior. The ribs 206 provide control for lateral movement of the lumbar attachment 200 relative to the pressure receiving member 34 .

As a result of the occupant being accelerated into the seat back 10, the lumbar attachment 200 receives an input force and transmits the input force to the horizontal shaft 34b of the pressure receiving member 34 to actuate the emergency start headrest as explained above with reference to Working Example 1 12.

Working Example 5

In FIG. 18 , Working Example 5 illustrates the seat back 10 and the lumbar attachment 200 of Working Example 4 . Furthermore, a pair of links 208 are connected to the lower region of the lumbar attachment 200 and to the side member 18 a of the seat back 10 . The link 208 provides a limit to the movement of the lower region of the lumbar attachment 200 relative to the seat back 10 . The link may be formed from wire or any suitable material.

Working Example 6

FIG. 19 illustrates Working Example 6, which is a modification of Working Example 4. FIG. Seat back 10 is illustrated with lumbar attachment 200 . A pair of tension coil springs 210 are added to the lower portion of the lumbar attachment 200 and both extend from the lateral sides and are connected to one of the side members 18 a of the seat back 10 . The spring 210 provides compliance to the lower portion of the waist attachment 200 and serves to return the waist attachment 200 to the designed position in the absence of a force thereon.

Needless to say, the above working examples are only for illustrating the present invention, but not limiting the present invention in any way; any variations and modifications to the present invention within the technical scope thereof are included in the embodiments of the present invention.

Industrial applicability

In general, the present invention is applicable to head restraints that can be freely installed or removed from the seat back. However, the applicability of the present invention is not limited to the above uses. The present invention is also applicable to head restraints that cannot be freely installed or removed from the seat back.

In Working Example 3, although the description was given regarding the case where the lumbar support for the vehicle seat is the crank member, the applicability of the present invention is not limited to this case. The present invention is widely applicable to a holding structure of a crank member mounted on a support member in a freely circularly movable manner. For example, the present invention is applicable to a retaining structure of a crank-shaped pressure receiving member (for an actuating headrest of a vehicle seat), wherein the crank-shaped pressure receives a load from a seated person when a rear-end collision occurs. The receiving member forcibly tilts the headrest in an upper direction and a forward direction.

Explanation of Reference Numbers

10: Seat back

12: headrest

14: Circular moving link

16: Swing support pin (swing support point for circular moving link)

20: Support shaft

24: Retainer bracket

26: Bracket guide

28f, 28r: front and rear walls

28a, 28b: first support surface and second support surface

30: Energy supply device

34: Pressure receiving member

34a: Vertical axis

34b: Horizontal axis

112: Lumbar support (crank member)

112a1, 112a2: arm

112a'1, 112a'2: Approximate letter L-shaped part

122: Seat Back Frame

122L, 122R: side frame (support member)

124: Insertion hole

124a: Larger diameter hole

124b: Slotted hole with smaller diameter

130: Bushing

130a: subject

130b: Flange part

130c: Joint

200: waist attachment

202: coil spring

204: Keep the Hook

206: Rib

208: connecting rod

210: coil spring

1. Task

The task of the present invention is to achieve an initial start-up performance which does not forcibly apply shock loads to the occupant and a start-up maintenance performance which does not rely on pressure from the occupant's pelvic region without complicating the structure. load.

2. The means used to accomplish the task

A pressure receiving member 34 designed to be able to receive loads from the occupant's pelvic region and back portion is provided inside the seat back. The pressure receiving member 34 is formed in an approximate shape of a letter U as seen from the front, which enables the pressure receiving member to receive a load from the passenger's back portion and a load from the passenger's pelvic region. The pressure receiving member 34 is connected to a crank member 36 arranged to hang across the left and right side members 18a. When a rear-end collision occurs, due to the load applied by the passenger's pelvic region, the pressure receiving member circularly moves the crank member 36 in the rearward direction and the upper direction, and moves to the rearward direction and the upper direction at the same time, against The supply force provided by the tension spring 30 moves the circular moving link circularly; therefore, after the load is applied by the passenger's pelvic region, the load applied by the passenger's back part is also acted on the pressure receiving member to Continue to move the circular move linkage in a circular motion.

3. Questions

In constructions where bushing nuts and E-rings are used to prevent the arms from falling out, special processes are required, as well as special tools, which are different from those used to form the crank member.

4. Means used to solve problems

The edge of the arm 112a1 of the lumbar support (crank member) is bent to form an approximately L-shaped portion 112a'1, and the approximately L-shaped portion is inserted into an insertion hole 124 formed on the side frame (support member) 122L. middle. The insertion hole 124 takes a keyhole-like shape starting from a larger-diameter hole and continuously extending to a smaller-diameter elongated hole, which is formed to a certain length so that a portion approximately letter L-shaped can be Inserted into the insertion hole in the horizontal direction. After the approximately letter L-shaped portion 112a'1 is inserted through the insertion hole 124, the bushing 130 with the flange is installed around the arm 112a1 through the approximately letter L-shaped portion, and with the larger diameter hole 124a of the insertion hole. fit together. Accordingly, the arms of the lumbar support are supported in the insertion holes of the side frames in a circular movement.

While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.

Claims (20)

1. A seat back structure of a vehicle seat by causing a predetermined pressure receiving member provided inside the seat back to receive transfer of inertia in a rearward direction experienced by a passenger resulting from a rear-end collision, To forcibly change the position of the headrest in the upper direction and the front direction, the seat back structure includes: a pair of left circular moving links and right circular moving links mounted on the left and right side members of the seat back frame, respectively, to be able to swing; a support shaft which is laterally disposed astride a predetermined edge suspended from the pair of left and right circular moving links so that when the circular moving links move circularly , movements along the arc in the upper and lower directions are possible; and a column-shaped holder bracket inserted into and supported by a headrest post provided integrally with the support shaft, and designed to pass through and fixed on the a bracket guide on the upper member of the seat back frame so as to freely slide in contact with said bracket guide and to freely tilt; Wherein, therefore, when the circular moving link moves circularly against the above-mentioned supplying force, it is possible to ensure that the headrest is in the upper changing position while tilting forward with the bracket guide as a fulcrum; Wherein, the above-mentioned pressure receiving member is fixed to the support shaft via its upper end so as to move in response to the support shaft, and the above-mentioned pressure receiving member is designed as a pressure receiving member extending in a lower direction so as to receive pressure from a passenger. loads on the pelvic region and back section; and Wherein, the above-mentioned pressure receiving member is supported by a crank member which is arranged to straddle and hang in the left and right directions of the seat back, and is supported to be rotatable by means of a shaft, and laterally The arrangement is such that a circular movement is possible in the rearward direction and in the upper direction. 2. The seat back structure of a vehicle seat according to claim 1, wherein the above-mentioned pressure receiving member is formed in an approximate shape of a letter U when viewed from the front, and has a pair of vertical and horizontal axes, the A pair of vertical shafts enables the pressure receiving member to receive a load from a back portion of a passenger, and the horizontal shaft enables the pressure receiving member to receive a load from a pelvic region of a passenger. 3. The seat back structure of a vehicle seat according to claim 1, wherein the bracket guide is provided with a front wall and a rear wall, each of which has a first supporting surface and a The second support surface, the inclination angle of the first support surface corresponds to the angle when the holder bracket is in the lower initial position of the headrest, and the inclination angle of the second support surface corresponds to the holder The bracket is at the angle when the upper part of the headrest changes position, and the first support surface and the second support surface of the front wall and the rear wall are alternately formed at different levels so as to be able to hold the The parallel planes sandwiched between the tor brackets. 4. The seat back structure of a vehicle seat according to claim 1, further comprising a lumbar attachment connected to the pressure receiving member so as to provide lumbar support to an occupant and to provide support to the pressure receiving member. The receiving component provides the target. 5. The seat back structure for a vehicle seat of claim 4, wherein the lumbar attachment has a generally rectangular perimeter and has a contoured seat back profile. 6. The seat back structure of a vehicle seat according to claim 5, wherein the lumbar attachment is formed with a grid-like pattern. 7. The seat back structure for a vehicle seat of claim 6, wherein the lumbar attachment further comprises a series of rows of support members and a series of columns of support members having a series of trusses therebetween. 8. The seat back structure of a vehicle seat as claimed in claim 7, wherein said series of trusses are gathered in a lower region of said lumbar attachment. 9. The seat back structure of a vehicle seat according to claim 4, further comprising a pair of tension coil springs, each tension coil spring of the pair of tension coil springs is mounted to the waist portion and mounted to the left and right side members to support the upper region of the lumbar accessory while providing compliance to the position of the upper portion of the lumbar accessory. 10. The seat back structure of a vehicle seat according to claim 4, wherein said lumbar attachment further comprises a pair of retaining hooks having inclined edges so as to be connected to said pressure receiving member And hold the pressure receiving member. 11. The seat back structure of a vehicle seat according to claim 4, wherein said lumbar attachment further comprises a pair of laterally spaced ribs, each of said pair of laterally spaced ribs being laterally spaced apart. Open ribs are provided on opposing lateral sides of the pressure receiving member to provide control of lateral movement of the lumbar attachment relative to the pressure receiving member. 12. The seat back structure of a vehicle seat according to claim 4, further comprising a pair of links, each of said pair of links being connected to a lower region of said lumbar attachment, and Connected to one of the left side member and the right side member to provide restriction of movement of the lower region of the waist attachment relative to the left side member and the right side member. 13. The seat back structure of a vehicle seat according to claim 12, further comprising a pair of tension coil springs, each tension coil spring of the pair of tension coil springs being connected to the waist portion and connected to one of the left side member and the right side member to provide compliance to the lower portion of the lumbar attachment and return the lumbar attachment to a design position. 14. A seat back structure of a vehicle seat by causing a predetermined pressure receiving member provided inside the seat back to receive transfer of inertia in a rearward direction experienced by a passenger resulting from a rear-end collision, To forcibly change the position of the headrest in the upper direction and the front direction, the seat back structure includes: a pair of left circular moving links and right circular moving links mounted on the left and right side members of the seat back frame, respectively, to be able to swing; a support shaft which is laterally disposed astride a predetermined edge suspended from the pair of left and right circular moving links so that when the circular moving links move circularly , movements along the arc in the upper and lower directions are possible; and a column-shaped holder bracket inserted into and supported by a headrest post provided integrally with the support shaft, and designed to pass through and fixed on the a bracket guide on the upper member of the seat back frame so as to freely slide in contact with said bracket guide and to freely tilt; Wherein, therefore, when the circular moving link moves circularly against the above-mentioned supplying force, it is possible to ensure that the headrest is in the upper changing position while tilting forward with the bracket guide as a fulcrum; Wherein, the above-mentioned pressure receiving member is fixed to the support shaft via its upper end so as to move in response to the support shaft, and the above-mentioned pressure receiving member is designed as a pressure receiving member extending in a lower direction so as to receive pressure from a passenger. loads on the pelvic region and back section; and Wherein, the above-mentioned pressure receiving member is supported by a crank member which is arranged to straddle and hang in the left and right directions of the seat back, and is supported to be rotatable by means of a shaft, and laterally Arranged so that circular movement in the rearward and upward directions is possible, and the circular movement of the crank member is transmitted to the circular movement link through the support link, making the circular movement link resist the supply force circular movement. 15. The seat back structure of a vehicle seat according to claim 14, wherein said pressure receiving member is formed in a shape approximately of a letter U as viewed from the front, and has a pair of vertical and horizontal axes, said A pair of vertical shafts enables the pressure receiving member to receive a load from a back portion of a passenger, and the horizontal shaft enables the pressure receiving member to receive a load from a pelvic region of a passenger. 16. The seat back structure of a vehicle seat as claimed in claim 14, wherein said bracket guide is provided with a front wall and a rear wall each having a first support surface and a rear wall. The second support surface, the inclination angle of the first support surface corresponds to the angle when the holder bracket is in the lower initial position of the headrest, and the inclination angle of the second support surface corresponds to the holder The bracket is at the angle when the upper part of the headrest changes position, and the first support surface and the second support surface of the front wall and the rear wall are alternately formed at different levels so as to be able to hold the The parallel planes sandwiched between the tor brackets. 17. A retaining structure for a crank member, wherein the left arm edge and the right arm edge of the crank member are respectively bent into an approximate shape of a letter L, said retaining structure comprising: A left support member and a right support member each having a keyhole-shaped insertion hole formed therethrough starting from a larger diameter hole and extending continuously to a smaller diameter elongated hole, the insertion hole such that the approximately L-shaped portion of the arm edge of the crank member can be inserted into the insertion hole in the horizontal direction; and a bushing designed to fit within the larger diameter hole of the insertion hole and disposed around the arm of the crank member, the bushing being fitted into the larger diameter hole of the insertion hole in larger diameter holes; Thereby, the crank member is held between the left support member and the right support member. 18. A retaining structure for a crank member as claimed in claim 17, wherein said bushing is formed of hard rubber or plastic and integrally includes its main body and flange portion, said main body being configured to fit together with said larger diameter hole of said insertion hole, and the diameter of the flange portion is greater than the diameter of the larger diameter hole; wherein said bushing further comprises an engagement member engaging the periphery of said larger diameter hole and sandwiching said support member in a space between said engagement member and said flange portion, The flange portion is formed on an outer peripheral surface of the main body of the bush. 19. A retaining structure for a crank member as claimed in claim 18, Wherein the engagement members are formed at a plurality of separate locations on the outer peripheral surface of the body of the bushing. 20. A retaining structure for a crank member as claimed in claim 17, Wherein, the elongated hole of the insertion hole extends in a direction other than the direction in which the load is applied, and the insertion hole is formed in a circular shape that is different from the approximately L-shaped portion of the edge of the arm. Where the movement ranges overlap.

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