JP4136552B2 - Seat reclining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat reclining device, and more particularly to a seat reclining device provided on a rear seat in an automobile.
[0002]
[Prior art]
As this type of conventional seat reclining device, there is one described in, for example, Japanese Patent Application Laid-Open No. 10-99157, filed earlier by the present applicant.
[0003]
An outline will be described based on FIG. 9. This seat reclining device is fixed to a base plate 1 fixed to a seat cushion in a vehicle and a seat back 2, and can be rotated to the base plate 1 via a center shaft 3. A pivoted arm 4, a lock mechanism (not shown) that locks the arm 4 in a predetermined position, and a center side end portion 6 a are locked to one end portion of the center shaft 3, so that the seat back 2 is anti-reclining direction And a spiral spring 6 that biases the spring.
[0004]
The base plate 1 is provided with a protrusion 7 that holds the outer peripheral end 6b of the spiral spring 6 in a state where a predetermined biasing force is applied to the spiral spring 5 in advance. Is provided with an engaging protrusion 8 that can be engaged with the outer peripheral end 6 b of the spiral spring 6.
[0005]
When the seat back 2 is in a predetermined standing state, the engagement protrusion 8 of the arm 4 is in contact with the outer peripheral end 6b of the spiral spring 6 in a state where a predetermined biasing force is applied in advance.
[0006]
When the arm 4 is unlocked from the standing state of the seat back 2 and the seat back 2 is rotated in the reclining direction, that is, the backward tilting direction (arrow A direction), the engagement protrusion 8 of the arm 4 is turned into the spiral spring 6. The spiral spring 6 moves away from the protrusion 7 of the base plate 1 and applies a spring urging force in the anti-reclining direction to the seat back 2. As a result, the seatback 2 is given a restoring force in the upright direction with a predetermined urging force, so that the seatback 2 can be gently rotated backwardly in the seated state.
[0007]
On the other hand, when the arm 4 is unlocked from the standing state and the seat back 2 is rotated in the anti-reclining direction, that is, in the forward tilting direction (arrow B direction), the engaging protrusion 8 of the arm 4 moves to the spiral spring 6. It is separated from the outer peripheral side end 6b. As a result, the spring biasing force of the spiral spring 6 is not applied to the seat back 2 at all, so that the seat back 2 can be gently rotated from the standing state to the forward tilt direction.
[0008]
[Problems to be solved by the invention]
However, in the conventional seat reclining device, the protrusion 7 that holds the outer peripheral end 6b of the spiral spring 6 is integrally formed at the upper position of the upper end of the base plate 1 and protrudes outward. There is a possibility that the entire base plate 1 is enlarged and the degree of freedom of layout is restricted.
[0009]
Moreover, since the relative position between the center shaft 3 and the protrusion 7 is fixed, the center end 6a and the outer end 6b of the spiral spring 6 are connected to the center shaft 3 and the protrusion 7. When locking, the spiral spring 6 must be locked while being tightened, so that the assembling work becomes complicated and the work efficiency is lowered.
[0010]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seat reclining device that can increase the degree of freedom in layout and improve the assembly work efficiency.
[0011]
According to a first aspect of the present invention, a seat back mounting arm is pivotally attached to a base plate via a center shaft, and a lock mechanism that locks the arm at a predetermined position is provided on the base plate. A seat reclining device that urges the seat back in an anti-reclining direction via a locking portion provided on the arm by a spiral spring locked to the base plate side, and the center shaft includes A stopper plate that is urged to rotate in the anti-reclining direction by the spiral spring is provided rotatably, and a predetermined portion of the stopper plate is provided to be able to contact the locking portion from the anti-reclining rotation urging direction. And when the seat back is tilted forward from the substantially upright state to the reclining direction on the base plate. Canceling means for canceling the spring force of the spiral spring with respect to the stopper plate the seat back by restricting the rotation of providing, said releasing means includes a stopper pin provided on said stopper plate, one end times to the base plate And a linkage plate linked to the stopper pin through a long hole formed at the other end, and the inside of the long hole of the linkage plate as the seat back rotates in the reclining direction. The stopper pin slides to allow the stopper plate to rotate, and when the seat back is tilted forward from the almost standing state to the reclining direction, the stopper pin is locked to the hole edge of the long hole of the linkage plate. Then, further rotation of the stopper plate is restricted, and transmission of the spring urging force from the stopper plate to the locking portion is released. It is characterized in that.
[0012]
Therefore, according to the present invention, a stopper plate separate from the base plate is rotatably provided, and the outer peripheral side end of the spiral spring is locked to the stopper plate, and the stopper plate is longer than the linkage plate. The stopper pin slides in the hole, allowing rotation in the reclining direction. In the anti-reclining direction, the stopper pin is further rotated at a predetermined rotation angle at which it abuts one end edge of the elongated hole. Since the degree of freedom of the overall layout is improved, the outer peripheral side end of the spiral spring can be locked to the stopper plate at an arbitrary rotation position of the stopper plate. There is no need to attach the coil in a tightened state, and assembly work is facilitated in this respect.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a seat reclining device according to the present invention will be described below in detail with reference to the drawings.
[0019]
1 and 2 show a first embodiment. This seat reclining device includes a base plate 11 fixed to a seat cushion (not shown), and a center shaft 12 fixed to the base plate 11 and fixed to a seat back (not shown). An arm 13 pivotally mounted via a shaft, a lock mechanism 14 for locking the arm 13 at a predetermined position, and a center side end portion 15a are fixed by caulking to the protruding end portion of the center shaft 12, The spiral spring 15 that biases the back in the anti-reclining direction (arrow A) and the outer peripheral side end portion 15b bent in a substantially letter shape of the spiral spring 15 are locked and biased to rotate in the anti-reclining direction. When the stopper plate 16 and the seat back are moved forward from the substantially standing state in the anti-reclining direction, the stopper plate 16 Regulate the movement and a releasing means 17 for releasing the spring force of the spiral spring 15 against the seat back.
[0020]
The base plate 11 is formed in a substantially rectangular shape, and the center shaft 12 is inserted and fixed at the upper end portion. At the same time, a support piece 11a located inside the arm 13 is integrally formed on one side of the upper end.
[0021]
The arm 13 has a rectangular shape that is long in the vertical direction, and a plurality of fixing bolt holes 13a are formed in the center and the upper portion, and a locking portion is a locking portion at a predetermined position on the lower side of the lower surface. A pin 18 is projected.
[0022]
The lock mechanism 14 has substantially the same structure as that of the prior art, and has an appendage (not shown) formed on the arm 13 and a tooth portion that can mesh with the tooth portion of the appendage, and can freely rotate on the base plate 11. A lower tooth supported on the base plate 11 and a support plate 19 fixed to the base plate 11 so as to be pivotally supported via a pivot pin 20 to actuate the lower tooth, and the operating lever 21 is locked. The coil spring 22 is configured such that one end of the coil spring 22 is engaged with the upper end portion 21a of the operating lever 21, while the other end portion is partly outside the support plate 21. It is latched by the front end fastening part 23 bent in the direction.
[0023]
The stopper plate 16 is formed in a substantially disk shape, is rotatably supported by the protruding end portion of the center shaft 12 inserted through the central insertion hole 16a, and has an outer peripheral side end portion of the spiral spring 15 on the upper portion. A locking piece 24 that 15b locks is provided integrally. Further, the locking piece 24 has an end 24a in an anti-reclining direction that can contact or be separated from the locking pin 18.
[0024]
The release means 17 includes a linkage plate 25 that is rotatably provided on the support piece 11a of the base plate 11, and a stopper pin 26 that protrudes from an elongated tip portion of the stopper plate 16. The linkage plate 25 includes: It is formed in an elongated plate shape, and one end portion is rotatably supported by the support piece 11a via a pivot pin 27, and the stopper is placed in a long hole 28 formed in the other end portion along the longitudinal direction. A pin 26 is slidably disposed. The stopper plate 16 is allowed to rotate in the reclining direction (arrow B direction) in the sliding range of the stopper pin 26 in the long hole 28. In the anti-reclining direction, as shown in FIG. Further rotation is restricted at a predetermined rotation angle in contact with one end edge 28a of the hole 28.
[0025]
The arm 13 is configured such that the maximum backward tilt position in the reclining direction is regulated by a stopper piece 29 provided at the rear upper end of the base plate 11.
[0026]
Therefore, according to this embodiment, after the operating lever 21 is lifted upward and the lock mechanism 14 is unlocked, the seat back is rotated from the standing state to the reclining direction (arrow B direction) as shown in FIG. Then, the locking pin 18 pushes the locking piece 24 in the same direction by the rotation of the arm 13 accompanying this. For this reason, since the stopper plate 16 rotates in the same direction through the long hole 28 of the linkage plate 25 against the spring force of the spiral spring 15, the seat back is loosened by the spring biasing force of the spiral spring 15. Can be rotated backwardly.
[0027]
On the other hand, when the seat back stands up as shown by the solid line in FIG. 2 and the lock mechanism 14 is unlocked and the seat back is rotated in the anti-reclining direction (arrow A direction), the stopper plate is in the upright position. Since the stopper pin 26 comes into contact with the one end hole edge 28a of the long hole 28 of the connecting plate 25 and the further rotation is restricted, the arm 13 is, as shown by the one-dot chain line in FIG. In a state where the locking pin 18 is separated from the locking piece 24 of the stopper plate 16, the locking pin 18 rotates in the anti-reclining direction. That is, it can be gently rotated in the forward tilt direction by its own weight in a state where the spring biasing force of the spiral spring 15 is released. As a result, sudden forward tilting rotation during rotation of the seat back in the anti-reclining direction is prevented, and danger to the operator or the like can be reliably avoided.
[0028]
In addition, a stopper plate 16 separate from the base plate 11 is rotatably provided on the center shaft 12 so that the outer peripheral side end 15b of the spiral spring 15 is engaged with the stopper plate 16, so that the spiral spring 15 The amount by which the outer peripheral side end 15b protrudes from the stopper plate 16 is reduced, so that the spiral spring 15 itself can be miniaturized and the degree of freedom in the overall layout is improved.
[0029]
Moreover, in order to assemble the spiral spring 15 and the like, the outer peripheral side end 15b is locked in advance with the engaging piece 24 of the stopper plate 16, and then the stopper plate 16 is moved in a state where the arm 13 is tilted to the most inclined position. The inner peripheral end 15 a is caulked and fixed to the protruding end of the center shaft 12 without being tightened while being arbitrarily rotated. Thereby, the spiral spring 15 can be easily assembled.
[0030]
Thereafter, when the stopper pin 26 is engaged with the elongated hole 28 of the linkage plate 28 in a state where the arm 13 is slightly tilted in the reclining direction from the standing state (state shown in FIG. 1), the spiral spring stopper plate 16 and the linkage plate 28 are engaged. Can be easily linked.
[0031]
As described above, the work of assembling the spiral spring 15, the stopper plate 16, and the connecting plate 28 becomes easy, so that the work efficiency can be improved.
[0032]
3 and 4 show a second embodiment of the present invention, in which the configuration of the release means 17 is changed. That is, the release means 17 is provided at a stopper protrusion 30 provided at a predetermined position on the outer periphery of the stopper plate 16 and a front end portion of the base plate 11 so that the seat back is inclined forward from a substantially upright state to an anti-reclining direction. In this case, the cam member 31 is a stopper member that abuts against the stopper protrusion 30 and restricts further rotation of the stopper plate 16.
[0033]
The stopper protrusion 30 is integrally provided in an arc shape along the outer peripheral edge of the front end side of the stopper plate 16, and the tip end portion 30 a is bent outward substantially at a right angle, and the circumferential end The edge 30b is formed in a slightly curved shape.
[0034]
On the other hand, the cam member 31 is formed in a substantially raindrop shape, and a base end portion is rotatably provided at a front end portion of the base plate 11 via a support pin 32 and is twisted around the support pin 32. The distal end portion 31a is urged by the spring 33 so as to contact the outer peripheral edge of the stopper plate 16, and the stopper plate 16 is in the reclining direction at a position where the distal end portion 31a contacts the end edge 30b of the stopper member 30. The maximum position to be regulated.
[0035]
That is, at the position where the rotation of the stopper plate 16 is restricted by the cam member 31, as shown in FIG. 4, the position of the seat back in the anti-reclining direction is set. The torsion spring 33 has one end 33 a locked to the side of the base plate 11 and the other end 33 b locked to the tip 31 a of the cam member 31.
[0036]
Therefore, when the seat back is rotated in the reclining direction from the standing state, the edge of the stopper projection 30 is separated from the tip 31a of the four cam members 31, and the anti-reclining of the spiral spring 15 is performed as shown in FIG. Since the spring biasing force in the direction is applied to the arm 13, the seat back can be gently rotated backward and tilted.
[0037]
On the other hand, when the seat back is rotated from the standing state in the anti-reclining direction, as shown by the solid line in FIG. Since the movement is restricted, the locking pin 18 is separated from the stopper plate 16 to block transmission of the spring biasing force of the spiral spring 16 to the seat back, as shown by a one-dot chain line in FIG. Therefore, the seat back can be gently tilted forward in the anti-reclining direction.
[0038]
In addition, the assembly work of the spiral spring 16 is as simple as the first embodiment, and the cam member 31 is attached to the base plate 11 independently without being directly linked to the stopper plate 16, so that the attachment work is performed. Is also easy.
[0039]
5 and 6 show a third embodiment, in which the configuration of the release means 17 is further different, and the stopper plate 16 is formed in a long lever shape and is extended to the end side. 34 and a stopper that protrudes from the base plate 11 and abuts against the stopper arm 34 and restricts further rotation of the stopper plate 16 when the seat back is tilted forward from the substantially upright state to the reclining direction. The projection 35 is configured.
[0040]
Therefore, when the seat back is rotated from the standing state in the reclining direction, as shown in FIG. 5, the stopper arm 34 is separated from the stopper projection 35 and the spring biasing force of the spiral spring 15 in the anti-reclining direction is applied to the arm 13. Therefore, the seat back can be gently rotated backward and tilted.
[0041]
On the other hand, when the seat back is rotated from the standing state to the anti-reclining direction, as shown by the solid line in FIG. 6, the side edge of the stopper arm 34 comes into contact with the side edge of the stopper projection 35 and further rotates. Therefore, as shown by the alternate long and short dash line in the figure, the locking pin 18 is separated from the stopper plate 16 to block transmission of the spring biasing force of the spiral spring 16 to the seat back. Therefore, the seat back can be gently tilted forward in the anti-reclining direction.
[0042]
Moreover, the assembling work of the spiral spring 16 is simple as in the first embodiment, and the stopper arm 34 is simply an extension of the stopper plate 16, so that the manufacturing work is extremely simple. Furthermore, since the stopper projection 35 is merely projected on the side of the base plate 11, its manufacturing operation and mounting operation are also easy.
[0043]
As described above, since the entire structure is simplified, the manufacturing work and the assembly work efficiency are improved, and the cost can be improved.
[0044]
7 and 8 show a fourth embodiment, in which the releasing means 17 includes a stopper portion 36 formed integrally with the outer end portion of the stopper plate 16 formed in an elongated rectangular shape, and a coil spring of the lock mechanism 14. And an end edge 23 of the stopper portion 36 when the seat back is tilted forward in the anti-reclining direction from a substantially upright state. Is in contact with the upper end of the fastening portion 23 to restrict further rotation of the stopper plate 16.
[0045]
Therefore, when the seat back is rotated in the reclining direction from the standing state, as shown in FIG. 7, the stopper portion 36 is separated from the fastening portion 23 and the spring biasing force of the spiral spring 15 in the anti-reclining direction is applied to the arm 13. Therefore, the seat back can be gently rotated backward and tilted.
[0046]
On the other hand, when the seat back is rotated from the standing state to the anti-reclining direction, as shown by the solid line in FIG. 8, the end edge of the stopper portion 36 abuts on the upper edge of the fastening portion 23 and further rotates. As a result of the restriction, as shown by the alternate long and short dash line in FIG. Therefore, the seat back can be gently tilted forward in the anti-reclining direction.
[0047]
In addition, the assembly work of the spiral spring 16 is as simple as the first embodiment, and the stopper portion 36 is simply a part of the stopper plate 16 and the manufacturing operation thereof is extremely simple. is there. Further, since the fastening portion 23 is also used for locking one end portion of the coil spring 22, the number of parts can be reduced, the entire structure can be simplified, and the manufacturing work and the assembling work are extremely easy. .
[0048]
The present invention is not limited to the configuration of the above-described embodiment. For example, the configuration of the release means 17 can be freely changed according to the specifications.
[0049]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, a stopper plate separate from the base plate is provided rotatably, and the outer peripheral side end of the spiral spring is locked to the stopper plate. As a result, the amount of the outer peripheral side end of the spiral spring protruding from the stopper plate is reduced, the size of the spiral spring itself can be reduced, and the degree of freedom of the overall layout is improved.
[0050]
In addition, since the outer peripheral side end of the spiral spring can be locked to the stopper plate at an arbitrary rotation position of the stopper plate, it is not necessary to attach the spiral spring in a tightened state. It becomes easy.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part showing a first embodiment of a seat reclining device according to the present invention.
FIG. 2 is a side view of an essential part for explaining the operation of the first embodiment.
FIG. 3 is a side view of an essential part showing a second embodiment.
FIG. 4 is a side view of an essential part for explaining the operation of the second embodiment.
FIG. 5 is a side view of an essential part showing a third embodiment.
FIG. 6 is a side view of an essential part for explaining the operation of the third embodiment.
FIG. 7 is a side view of an essential part showing a fourth embodiment.
FIG. 8 is a side view of an essential part for explaining the operation of the fourth embodiment.
FIG. 9 is a side view of a main part of a conventional seat reclining device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Base plate 12 ... Center shaft 13 ... Arm 14 ... Lock mechanism 15 ... Spiral spring 15a ... Center side edge part 15b ... Outer peripheral side edge part 16 ... Stopper plate 17 ... Release means 18 ... Locking pin (locking part)
25 ... Linking plate 26 ... Stopper pin 28 ... Long hole

Claims (1)

A seat back mounting arm is pivotally attached to the base plate via a center shaft, and a lock mechanism for locking the arm at a predetermined position is provided. A center side end is locked to the base plate side. A seat reclining device configured to urge the seat back in an anti-reclining direction via a locking portion provided on the arm by a spiral spring;
A stopper plate that is urged to rotate in the anti-reclining direction by the spiral spring is rotatably provided on the center shaft, and a predetermined portion of the stopper plate is placed on the locking portion from the anti-reclining rotation urging direction. A spring biasing force of a spiral spring against the seat back is regulated by restricting the rotation of the stopper plate when the seat back is tilted forward from the substantially upright state to the reclining direction. Providing release means to release,
The release means includes a stopper pin provided on the stopper plate, and a linkage plate having one end portion rotatably provided on the base plate and linked to the stopper pin through a long hole formed on the other end portion. In accordance with the rotation of the seat back in the reclining direction, a stopper pin slides in the elongated hole of the linkage plate to allow the stopper plate to rotate, and the seat back is almost upright from the upright state. When the stopper plate is tilted forward, the stopper pin is locked to the edge of the long hole of the linkage plate to restrict further rotation of the stopper plate, and the spring biasing force from the stopper plate to the locking portion is reduced. A seat reclining device, wherein transmission is canceled .

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