JP5396880B2 - Sheet device - Google Patents

Description

  The present invention relates to a seat device that enables forward folding and folding of a seat back of a vehicle seat.

  2. Description of the Related Art Conventionally, an angle adjustment mechanism that allows a seat back to be adjusted to a desired angle in a state where an occupant is seated is used in a vehicle seat. In addition, the seat device is attached to the seat so that the seat back is locked in the forward position where the seat back is tilted forward from the adjustment area by the angle adjustment mechanism, and further folded forward from the forward position to fold the seat back on the seat cushion. ing.

  Such a conventional seat apparatus includes an upper member fixedly supported by the seat back and a lower member fixedly supported by the seat cushion, and the upper member and the lower member are connected via a rotating shaft. A hook tooth groove is formed in the upper member, and a pole is supported on the lower member so as to be swingable about a pivot. Teeth are formed on the pole, and can be engaged with the engaging tooth gap of the upper member.

  When the seat back is brought to a predetermined forward position, the hook tooth groove of the lower member and the teeth of the pole mesh with each other, and the angular position (forward position) is maintained.

  Further, by rotating the pole, the engagement between the hook tooth gap and the teeth is released, so that the seat back is further moved from the forward position to the folded state. For this reason, in such a folded state, the back surface of the seat back can be used, for example, as a luggage storage (see, for example, Patent Document 1).

JP 2003-159140 A

  However, in the seat device configured as shown in Patent Document 1, a large load acts on the upper member and the pawl provided with the hanging tooth groove and the tooth in a state where the seat back is locked in the forwardly tilted position, Since the load is applied to the teeth and the pole as a shear load, the upper member and the pole must be formed of a sufficiently thick steel plate. It is also possible to arrange the meshing position away from the rotating shaft and reduce the load acting on the hanging tooth gap and the teeth, but there is a problem that the upper member is enlarged and the weight is increased.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention is to realize a seat device that can reduce a load applied to a locking portion without increasing the size of components.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an upper member supported on the seat back side of a seat and a lower member supported on the seat cushion side are rotatably connected by a rotating shaft, and the lower When the upper member is rotated with respect to the member, the seat back is brought into a locked state when the seat back shifts from the seating use position to the forward tilt position set between the seating use position and the full fall position. A forward folding mechanism having a locking mechanism for restricting the transition to the fall position, and a lock release for releasing the lock state of the lock mechanism to release the transition restriction state of the upper member to the full fall position An operating mechanism, and the locking mechanism includes a locking member that is pivotally supported by a support shaft at a position different from the rotation shaft in the upper member, and the rotation shaft in the lower member. A contact member supported at a different position, and when the seat back is in the forward position, the locking member that rotates around the rotation shaft is a rotation locus circle around the support shaft. Engaging the contact member at a portion extending in the radial direction to hold the seat back in a forwardly tilted position, and rotating the locking member about the support shaft by operating the locking release operation mechanism. Thus, the gist is that the engagement with the contact member is released to enable the seat back to be shifted to the folding position.

  According to a second aspect of the present invention, in addition to the first aspect, the lock release operation mechanism includes an operation lever connected to the lock member via a connection member, and the seat back is in a seating position. The gist of the invention is that the operation lever is buried in the seat back, and is exposed to the outside of the seat back when the seat back is in the forward-down position.

  In addition to claim 2, the invention according to claim 3 uses the connecting member as a cable so that the connecting end of the cable can move a predetermined distance with respect to the locking member. The gist of the locking member is a configuration including a loose gap connecting portion.

  According to a fourth aspect of the present invention, in addition to the first aspect, when the seat back is in the forward-turned position, the contact is on a tangent to a rotation locus circle at the center of the support shaft accompanying the rotation of the upper member. The gist is that the contact member is arranged.

  According to a fifth aspect of the present invention, in addition to the first aspect, the invention has the abutting member and is rotatably supported by the lower member, and rotates when engaged with the locking member. The gist of the present invention is to provide an operation member that is interlocked so as to release the lock mechanism of the seat slide device at the forward position of the seat back.

  In the present invention, when the seat back is in the forward-turned state, the locking member is engaged with the abutting member at a portion extending in the radial direction of the rotation locus circle around the support shaft. For this reason, a load acts on the locking member from the radial direction around the support shaft, and the load can be received with high holding strength. This eliminates the need for a separate engagement structure for firmly holding the engagement state, and the enlargement of the locking member and the contact member. Further, the engagement state with the contact member can be easily released by rotating the locking member around the support shaft.

  Further, the operation lever of the unlocking operation mechanism is appropriately exposed from the seat back when the operation is necessary, and the operation becomes easy.

  Further, the influence of the rotation of the upper member on the operation lever is reduced, and a safe operation can be ensured.

  Further, the locking member attached to the support shaft can release the engagement with the contact member with a light force.

  Further, the lock mechanism of the seat slide device can be automatically released in conjunction with the operation of the seat device.

It is a perspective view when the passenger | crew of the sheet | seat provided with the seat apparatus concerning this invention is in the state which seats and uses. It is a top view of the forward folding mechanism of the sheet apparatus concerning the present invention. It is a top view of the latch release mechanism of the sheet apparatus concerning the present invention. FIG. 2A is a plan view showing a state of a forward folding operation process of a seat, wherein FIG. 4A shows a forward folding mechanism that constitutes an unlocking mechanism of the seat device according to the present invention, FIG. The forward folding mechanism which comprises the latch release mechanism of the sheet | seat apparatus concerning this invention is shown by (a), the latch release mechanism is (b), and the completion | finish operation | movement state of the seat forward is shown with the top view. The forward folding mechanism which comprises the latch release mechanism of the sheet | seat apparatus in connection with this invention is shown by (a), the latch release mechanism is shown by (b), and the forward position cancellation | release state of the sheet | seat is shown with the top view. The forward folding mechanism which comprises the latch release mechanism of the sheet | seat apparatus concerning this invention is shown by (a), the lock release mechanism is (b), and the state of the folding process of a sheet | seat is shown with the top view. The forward folding mechanism which comprises the latch release mechanism of the sheet | seat apparatus concerning this invention is shown by (a), the latch release mechanism is (b), and the folding completion state of the sheet | seat is shown with the top view. The state of the process in which the forward folding mechanism which comprises the latch release mechanism of the seat apparatus concerning this invention returns from the folding state of a sheet | seat to a seating utilization state is shown with the top view. A plan view showing a state in which the forward folding mechanism constituting the unlocking mechanism of the seat device according to the present invention is (a), the unlocking mechanism is (b), and the seat back is adjusted rearward in the seating use area of the seat. Is shown. The various adjustment forms of a sheet | seat provided with the latch release mechanism of the sheet | seat apparatus concerning this invention are shown with the side view of (a)-(d).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a seat 1 in a state where an occupant is seated and used. The seat 1 includes a seat cushion 11 and a seat back 12. The seat cushion 11 is provided with a cushion frame 21, and the seat back 12 is provided with a back frame 25 as a strength member. A seat slide device 13 is attached to the lower surface of the cushion frame 21, and the entire seat 1 is supported on the floor (not shown) of the vehicle via the seat slide device 13.

  In FIG. 1, a forward folding mechanism 50 is attached between a right upper end portion of the cushion frame 21 and a right lower end portion of the back frame 25. Further, an angle adjustment mechanism 40 is attached between the left upper end portion of the cushion frame 21 and the left lower end portion of the back frame 25.

  Although the function will be described later, an unlocking operation mechanism 60 is attached to the seat 1 so as to be embedded in the seat back 12 in addition to the above. The locking release operation mechanism 60 and the forward folding mechanism 50 are connected by a cable 68, and the locking mechanism 13a of the seat slide device 13 and the forward folding mechanism 50 are connected by a cable 69 so as to be interlocked with each other.

  The seat device 5 includes a forward folding mechanism 50, an unlocking operation mechanism 60, and cables 68 and 69.

  The angle adjustment mechanism 40 is a known mechanism that has been widely used in the past, and the angle of the seat back 12 can be finely adjusted within the angle adjustment region (FIG. 11B) by operating the operation lever 40a. It is like that. The position of the seat back 12 when using the seat shown in FIG. 1 is held by the angle adjustment mechanism 40.

  FIG. 2 is a plan view showing the forward folding mechanism 50 when the seat 1 is in the state shown in FIG.

  The forward folding mechanism 50 includes an upper member 51 fixedly attached to the back frame 25 and a lower member 52 fixedly attached to the cushion frame 21. The upper member 51 and the lower member 52 are connected to each other by a rotation shaft 53 so as to be rotatable. As can be seen from FIG. 1, the position of the rotation shaft 53 viewed from the side surface direction of the sheet 1 coincides with the position of the rotation axis (not shown) of the angle adjustment mechanism 40.

  A pivot 55 is attached in the vicinity of the lower end portion of the upper member 51, away from the rotation shaft 53. A locking lever (locking member) 54 is rotatably attached to a pivot (support shaft) 55 provided so as to stand up with respect to the paper surface of FIG.

  The locking lever 54 includes a locking portion 54 a that extends downward from the pivot 55 and overlaps the lower member 52 in FIG. 2 beyond the lower end portion of the upper member 51. Further, the locking lever 54 includes an engaging portion 54 b that is bent and extends in the proximity direction to the rotating shaft 53 above the pivot shaft 55.

  Further, around the pivot 55, a spring 81 that urges the locking lever 54 in the clockwise direction is locked and attached to the upper member 51. The locking lever 54 urged by the spring 81 is held at the position shown in FIG. 2 with the end surface of the engaging portion 54 b abutting against the protrusion 51 a provided on the upper member 51.

  An elongated hole 54c is formed in the engaging portion 54b in the extending direction. A wire 68b of a cable 68 that connects the unlocking operation mechanism 60 and the forward folding mechanism 50 is attached to the elongated hole 54c so as to be movable in the elongated hole 54c at one end 68c. The outer jacket 68a of the cable 68 is attached to the cushion frame 21 side with an appropriate fixing member (not shown).

  A pivot shaft 56 is attached to the lower member 52 so as to stand up from the plane of FIG. 2, and an operation lever (operation member) 57 is rotatably attached to the pivot shaft 56. Around the pivot 56, a spring 82 is attached to the lower member 52 so as to urge the operating lever 57 counterclockwise. The actuating lever 57 biased by the spring 82 is in contact with the protrusion 52a provided on the lower member 52 at the end face, and is held at the position shown in FIG.

  An abutment pin 57a is attached to the other end of the operating lever 57 extending from the pivot 56 in a direction to stand up from the paper surface of FIG. A stopper 52b is provided on the lower member 52 in order to define the rotation range of the operating lever 57 together with the protrusion 52a.

  One end portion 69c of a wire 69b of a cable 69 connected to the lock mechanism 13a (FIG. 1) of the seat slide device 13 is attached to the operation lever 57. The outer cover 69a of the cable 69 is attached to the cushion frame 21 side with an appropriate fixing member (not shown).

  The locking mechanism 7 is configured by the locking lever 54 and the operating lever 57. The unlocking operation mechanism 60 shown in FIG. 1 is attached to the rear surface of the seat back 12.

  As shown in FIG. 3, the lock release operation mechanism 60 is attached so as to be buried inside the seat back 12. The unlocking operation mechanism 60 includes an operation lever 63 that is rotatably attached to a rotation shaft 62 that is supported by a member (not shown) of the seat back 12. The operation lever 63 includes an operation portion 63 a extending upward from the rotation shaft 62 and an operation portion 63 b extending substantially horizontally toward the inside of the seat back 12.

  The other end portion 68d of the wire 68b of the cable 68 is attached to the distal end portion of the operating portion 63b. The outer jacket 68a of the cable 68 is attached by an appropriate fixing member (not shown) of the seat back 12. Further, a spring 65 is attached to the front end portion of the operating portion 63 b between the seat back 12.

  The spring 65 urges the operation lever 63 to rotate in the clockwise direction in the state of FIG. 3 and acts to pull the wire 68b toward the unlocking operation mechanism 60. Then, one end 68c of the wire 68b approaches one side of the elongated hole 54c, and a predetermined tension is applied to the wire 68b so that no slack is produced. The length of the wire 68b is determined so that the operation portion 63a of the operation lever 63 is not exposed to the outside of the seat back 12 when the angle adjustment mechanism 40 is in the state shown in FIG.

  As described above, the seat 1 including the configured unlocking operation mechanism 60 can be changed to a state in accordance with various usage forms, as shown in FIGS.

  That is, (i) the seating use state of the occupant shown in FIG. 1 and FIG. 11 (a), (ii) the seat back 12 shown in FIG. The so-called walk-in operation that makes it easy to get on and off the seat arranged behind the seat 1, (iii) Release the seat back 12 locked in the forward-turned position in FIG. (Iv) Further, (iv) as shown in FIG. 11 (d), the angle of the seat back 12 is adjusted so that the occupant can obtain the desired sitting posture. This is a state where fine adjustment within the region is possible.

  The operation of the seat device 5 configured as described above will be described below.

  By operating the operating lever 40a (FIG. 1) of the angle adjusting mechanism 40 and releasing the angle adjusting mechanism 40, the seat 1 is moved from the seating use position state of FIG. 11 (a) to the walk shown in FIG. 11 (b). Set to in-actuated state.

  FIG. 4A shows a state of the forward folding mechanism 50 in the process of moving the seat back 12 forward by the walk-in operation, and FIG. 5A shows the state of the forward folding mechanism 50 when the process of moving the seat back 12 forward is completed.

  In the process shown in FIG. 4A, the upper member 51 rotates counterclockwise as the seat back 12 is tilted forward. The distal end portion of the locking lever 54 attached to the upper member 51 comes into contact with the contact pin 57a of the operating lever 57, and rotates the operating lever 57 clockwise.

  When the rotation of the upper member 51 proceeds and reaches the position shown in FIG. 5A, the contact pin 57a contacts the stopper 52b, and further rotation of the operating lever 57 is prevented. When the rotation of the operation lever 57 is stopped, the rotation of the upper member 51 is also prevented through the locking lever 54. In other words, the engagement of the contact pin 57a and the locking lever 54 restricts the transition of the seat back 12 to the fully tilted position.

  In the state shown in FIG. 5A, the rotation locus circle A is the center of the pivot (support shaft) 55 when the upper member 51 rotates, and the tangent line B is the rotation locus circle A. The contact point P between the locking lever 54 and the contact pin 57a is set on the tangent line B. In this configuration, the contact point P is a position away from the end of the upper member 51, and the distance from the rotation shaft 53 can be set large. Further, when the seat back 12 is in the forward-turned state, the locking lever 54 is engaged with the contact pin 57 a at a portion extending in the radial direction of the rotation locus circle around the pivot 55. For this reason, a load acts on the locking lever 54 from the radial direction around the pivot 55, and the load can be received with a high holding strength. This eliminates the need for a separate engagement structure for firmly holding the engagement state, and the enlargement of the locking lever 54 and the contact pin 57a (operation lever 57). Further, by rotating the locking lever 54 about the pivot 55, the engagement state with the contact pin 57a can be easily released.

  Usually, the seat 1 employs an auxiliary spring (not shown) for moving the seat back 12 forward, and the seat back 12 rotates at a high speed when the seat 1 is moved forward. By separating the contact P from the rotation shaft 53, the impact force generated at each member at the contact point P at the time of contact can be reduced. As a result, it is possible to avoid the use of a thick material that increases in weight, or a large shape, particularly in the upper member 51 and the locking lever 54, which is advantageous in reducing the weight and size of the seat device 5.

  In the configuration shown in FIG. 5A, the stopper 52b is also arranged on the tangent line B, which is advantageous in securing the strength of each component. However, the stopper 52b may not necessarily be disposed on the tangent line B as long as the position of the operation lever 57 can be ensured.

  4A to 5A, the wire 69b of the cable 69 is pulled by the operation lever 57, and the lock mechanism 13a (FIG. 1) of the seat slide device 13 is released. The release of the lock mechanism 13a (FIG. 1) causes the seat 1 to slide forward by the action of a spring (not shown) provided in the seat slide device 13, and the walk-in operation shown in FIG. 11B is completed. To do.

  With the operation shown in FIGS. 4A to 5A of the forward folding mechanism 50, the unlocking operation mechanism 60 is in the state of FIGS. 4B to 5B. That is, the rotation of the upper member 51 acts so as to reduce the tension applied to the wire 68b, and the operating lever 63 is moved from the position of FIG. 3 to FIGS. 4B and 5B by the acting force of the spring 65. And rotate clockwise. When the seat 1 shown in FIG. 3 is in the seated state, the operation lever 63 buried in the seat back 12 is exposed to the outside of the seat back 12.

  Next, as shown in FIG. 6 (b), when the operating lever 63 exposed outside the seat back 12 is operated and rotated in the direction of arrow C, the operating lever 57 is shown in FIG. 6 (a). Rotates in the direction of arrow D, and the contact with the contact pin 57a is released. By releasing the contact between the operation lever 57 and the contact pin 57a, the upper member 51 can be further rotated forward.

  Since the contact point P shown in FIG. 5 is arranged on the tangent line B, the contact between the locking lever 54 and the contact pin 57 a can be released by the operation force of the light operation lever 63.

  7A and 7B show a forward folding mechanism 50 and an unlocking operation mechanism 60 in which the sheet 1 is folded. 8A and 8B show a forward folding mechanism 50 when the seat back 12 is overlaid on the cushion 11 as shown in FIG. 11C and the seat 1 is folded. And the latch release operation mechanism 60.

  As shown in FIGS. 7A and 8A, as the upper member 51 rotates, the locking lever 54 to which the end portion 68c of the wire 68b of the cable 68 is attached also rotates. At this time, the end 68c attached to the elongated hole 54c formed in the locking lever 54 moves in the elongated hole 54c. Due to the movement of the end portion 68c shown in FIGS. 7A and 8A, the operation lever 63 can be kept from being buried in the seat back 12 even when the upper member 51 is largely rotated forward. Therefore, even if the operator does not release his hand from the operation lever 63, safety is maintained without being pinched.

  FIG. 9 shows the forward folding mechanism 50 in the process of returning the seat 1 from the folded state to the seating utilization state. At this time, the locking lever 54 abuts against the abutment pin 57a and rotates counterclockwise against the spring 81 (FIG. 2), so that the upper member 51 is rotated to the clockwise position to the seating use position. The return of is not hindered.

  10 (a) and 10 (b) show the case where the seat back 12 is shown in FIG. 1 when the occupant is seated in a relaxed posture from the driving state such as when stopped as shown in FIG. 11 (d). The forward folding mechanism 50 and the lock release operation mechanism 60 when adjusted by tilting backward are shown.

  When the upper member 51 is tilted backward, the wire 68b is pulled toward the forward folding mechanism 50, and as shown in FIG. 10B, the operation lever 63 rotates counterclockwise, but is buried in the seat back 12. Thus, the operation lever 63 can be prevented from being operated carelessly.

DESCRIPTION OF SYMBOLS 5 Seat apparatus 7 Locking mechanism 11 Seat cushion 12 Seat back 13 Seat slide 13a Lock mechanism 50 Forward folding mechanism 51 Upper member 52 Lower member 54 Locking member 54c Free gap connection part (long hole)
55 Support shaft 57a Contact member 60 Unlocking operation mechanism 63 Operation lever 68 Connecting member (cable)

Claims (5)

A seat having a seat back and a seat cushion,
The rotatably connecting the lower member which is supported on the upper member and the seat cushion side which is supported on the seat back side rotation shaft, the seat back is seated use position by rotation of the upper member with respect to the lower member A forward folding mechanism having a locking mechanism that enters a locked state and restricts the transition of the upper member to the fully tilted position when shifting from the seating utilization position to the fully tilted position. When,
An unlocking operation mechanism for releasing the locking state of the locking mechanism to release the state of restricting the transition of the upper member to the all-over position,
The locking mechanism includes a locking member that is pivotally supported by a support shaft at a position different from the rotation shaft in the upper member, and a contact member that is supported at a position different from the rotation shaft by the lower member. When the seat back is in the forward-turned position, the contact member is rotated at a portion extending in a radial direction of a rotation locus circle around the support shaft. The seat back is held in the forward-turned position by engaging with the engagement member, and the engagement with the contact member is released by rotating the engagement member around the support shaft by the operation of the engagement release operation mechanism. A seat device that enables the seat back to be shifted to the folded position.   The unlocking operation mechanism includes an operation lever connected to the locking member via a connecting member, and when the seat back is in the seating position, the operation lever is buried in the seat back, and the seat back is moved forward. The seat device according to claim 1, wherein the seat device is configured to be exposed outside the seat back. Said coupling member as a cable, as connecting end of the cable relative to the locking member is capable of moving a predetermined distance, said locking member is provided with a Joint Gap gap coupling part, according to claim 2 Sheet equipment.   2. The seat device according to claim 1, wherein the abutting member is disposed on a tangent to a rotation locus circle at a center of the support shaft accompanying the rotation of the upper member when the seat back is in a forward-turned position. .   It has the abutting member and is rotatably supported by the lower member, and rotates when engaged with the locking member so as to release the lock mechanism of the seat slide device at the forwardly retracted position of the seat back. The seat device according to claim 1, further comprising an operating member that is interlocked with each other.

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