JP4870465B2 - Lock structure for vehicle seat back - Google Patents

Description

  The present invention relates to a vehicle seat back locking structure.

  Conventionally, a strike mechanism provided on the vehicle body side is engaged with a lock mechanism (lock cam) provided on the seat back side to lock the seat back to the vehicle body side, and a connecting rod (release rod) is connected to the lock mechanism (lock cam). There is a vehicle seat back locking structure in which a lock mechanism (lock cam) is released by a push operation of a lock release knob (release knob) connected via a lock mechanism to unlock the seat back (Patent Document 1). reference).

  The connecting rod is made of metal to maintain strength, and the unlocking knob is connected to the connecting rod by screwing the female screw of the unlocking knob into the male screw at the end of the connecting rod. Since it is necessary to screw the unlocking knob into the rod, the number of assembling steps is increased, and the height of the unlocking knob differs depending on the screwing amount, so that the screwing amount must be managed.

Therefore, as shown in FIG. 14A, the unlocking knob 32 is fitted to the bezel 31 fixed to the upper part of the seat back 30 so as to be movable up and down, and the unlocking knob 32 is connected to the upper end 33 a of the connecting rod 33. It is conceivable to connect the lock release knob 32 to the connecting rod 33 by press-fitting the press-fitting hole 32a.
JP-A-8-192668

  However, when the press-fit hole 32a of the unlocking knob 32 is press-fitted into the end 33a of the connecting rod 33, as shown in FIG. 14 (b), a stopper 34 is required to stop the connecting rod 33 from being lowered. However, since the compression load acts on the connecting rod 33 due to the pressure input of the unlocking knob 32 and the connecting rod 33 made of synthetic resin is easily deformed, the unlocking knob 32 may not be press-fitted. There is a problem that an expensive and heavy iron connecting rod 33 must be used.

  The present invention has been made to solve the above-mentioned problems, and provides a vehicle seat back locking structure devised so that an unlocking knob can be securely connected to a cheap and lightweight synthetic resin connecting rod. It is for the purpose.

  In order to solve the above problems, the first means of the present invention is to lock the seat back to the vehicle body side by engaging the lock mechanism provided on the seat back side with the striker provided on the vehicle body side. A lock structure for a vehicle seat back in which the lock mechanism is released by pushing a lock release knob connected to the mechanism via a connecting rod, and the seat back is unlocked. Is molded with synthetic resin, and a first locking projection is formed at the end connecting the unlocking knob, and the unlocking knob is fitted into the through hole of the bezel fixed to the seat back so as to be movable up and down. A lower cylindrical portion is formed, and an insertion hole into which the end of the connecting rod can be inserted and a slit through which the first locking projection is inserted are formed in the lower cylindrical portion. The first locking projection of the rod is set to the minimum inner diameter that can be penetrated, and at the time of assembly, the first locking projection is passed through the through hole of the bezel together with the end of the connecting rod, and then the end of the connecting rod When the insertion hole of the lower cylinder part of the unlocking knob is inserted into the part, the first locking protrusion is inserted into the slit in a state where the first locking protrusion is stopped by the inner edge part of the through hole of the bezel, and the end part A vehicle seat back locking structure is provided in which the lower cylinder portion is inserted into the through hole while press-fitting into the insertion hole.

  According to a second means of the present invention, a lock mechanism provided on the seat back side is engaged with a striker provided on the vehicle body side to lock the seat back to the vehicle body side, and connected to the lock mechanism via a connecting rod. The lock structure of the vehicle seat back is configured to unlock the seat back by releasing the engagement of the lock mechanism by the push operation of the unlocking knob, wherein the connecting rod is formed of a synthetic resin, A first locking projection and a second locking projection are formed at an end portion connecting the lock release knob, and the lock release knob is fitted to the through hole of the bezel fixed to the seat back so as to be movable up and down. A lower cylinder portion is formed, and an insertion hole into which the end of the connecting rod can be inserted, a slit through which the first locking protrusion is inserted, and a locking hole for locking the second locking protrusion. Forming The through hole of the bezel is configured to have a minimum inner diameter that allows the first locking projection and the second locking projection of the connecting rod to pass through, and when assembled, together with the end of the connecting rod, After the second locking projection is passed through the through hole of the bezel, the first locking projection is inserted into the inner edge of the through hole of the bezel when the insertion hole of the lower cylinder portion of the unlocking knob is inserted into the end portion of the connecting rod. The first locking projection is inserted into the slit while the second locking projection is press-fitted into the insertion hole, and the second cylindrical portion is inserted into the through hole. The present invention provides a vehicle seat back locking structure characterized by locking locking protrusions.

  According to the first means of the present invention, the first locking projection is passed through the through hole of the bezel together with the end of the connecting rod made of synthetic resin, and then the lower cylinder portion of the unlocking knob is connected to the end of the connecting rod. When inserting the insertion hole of the lower cylinder, with the first locking protrusion held against the inner edge of the through hole of the bezel, the first locking protrusion is inserted through the slit and the end is press-fitted into the insertion hole. The part can be inserted into the through hole.

  Therefore, it is the inner edge of the through hole in the bezel that stops the first locking projection of the connecting rod that stops the connecting rod from falling down during assembly. Even if a load is applied, the synthetic resin connecting rod does not deform, so the unlocking knob can be pressed in smoothly, and the unlocking knob can be securely connected to the inexpensive and lightweight synthetic resin connecting rod. There is no need to use expensive and heavy iron connecting rods.

  Further, by inserting the lower cylinder portion of the unlocking knob into the through hole of the bezel, the gap between the through hole and the end portion of the connecting rod is narrowed, so that the first locking projection of the connecting rod is connected to the through hole of the bezel. There is no possibility that the end of the connecting rod is detached from the insertion hole of the unlocking knob by being locked at the inner edge.

  According to the second means of the present invention, the first locking projection and the second locking projection are passed through the through hole of the bezel together with the end of the connecting rod made of synthetic resin, and then the end of the connecting rod When inserting the insertion hole of the lower cylinder part of the unlocking knob, the first locking projection is inserted into the slit with the first locking projection held against the inner edge of the through hole of the bezel, and the second locking The lower cylinder portion can be inserted into the through hole while the projection is press-fitted into the insertion hole, and the second locking projection can be locked by the locking hole when the insertion is completed.

  Therefore, in addition to the effect of the first means of the present invention, the second locking projection of the connecting rod is locked by the locking hole of the unlocking knob when the insertion is completed, so that the unlocking knob cannot be pulled out to the connecting rod. It will be possible to connect with certainty.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1A and 1B, the seat backs 2A and 2B of the rear seat 1 for a vehicle are divided into, for example, 6: 4, and the seat backs 2A and 2B are respectively separated from the seat cushion 3. It is connected with a hinge member (not specifically shown) so that it can be moved forward.

  The seat backs 2A and 2B are each provided with a lock (catch) mechanism 6 provided inside the seat backs 2A and 2B on the U-shaped striker 5 of the bracket 4 provided on the vehicle body side in the standing position of FIG. By engaging [see FIGS. 2 (a) and 2 (b)], the seat backs 2A and 2B are locked to the vehicle body side in the standing position. In FIG. 1A, reference numeral 2a denotes a slit formed in the skin (trim), and the striker 5 enters the seat backs 2A and 2B from the slit 2a.

  From this locked state, the engagement of the lock mechanism 6 is released by the manual operation (push operation) of the unlocking knob 7 provided on the shoulders of the seatbacks 2A and 2B, and the seatbacks 2A and 2B are unlocked. Thus, the seat backs 2A and 2B can be moved forward (see arrow F).

  In FIG. 1A, only the left seat back 2A is moved forward. Thus, the luggage space behind the rear seat 1 can be expanded by moving forward at least one side of each of the seat backs 2A and 2B.

  In FIGS. 1 (a) and 1 (b), the seat backs 2A and 2B are covered with a skin (trim). In FIGS. 2 and below, the illustration of the skin and a decorative cover is omitted, and the left seat back 2A. Only the right seat back 2B is not shown.

  As shown in FIGS. 3A, 3B and 4A, 4B, the lock mechanism 6 is attached to an outer portion of a bracket 11 fixed to the left shoulder portion of the back frame 10 of the seat back 2A. Yes.

  The lock mechanism 6 includes a fork 12 having an engagement groove 12a for engaging the striker 5 and a claw lever 13 for locking the fork 12 in the engagement position. The fork 12 is rotatably supported by the support shaft 14, and the claw lever 13 is rotatably supported by the support shaft 15, and a spring 16 is stretched between the fork 12 and the claw lever 13. It is installed.

  When the seatback 2A, which has been tilted forward as shown in FIG. 1 (a), is tilted backward (see arrow B) as shown in FIG. 1 (b), the striker 5 on the vehicle body side as shown in FIG. 4 (b). Is engaged with the engaging groove 12a of the fork 12 (see arrow d), the fork 12 is rotated clockwise (see arrow e) against the urging force of the spring 16 while being pushed by the striker 5. As shown in FIG. 4A, when the lock portion 12 b of the fork 12 falls into the lock portion 13 a of the claw lever 13, the fork 12 is locked to the engagement position of the striker 5 by the claw lever 13. As a result, the seat back 2A is locked to the vehicle body side at the standing position shown in FIG.

  4A, when the claw lever 13 is turned counterclockwise (see arrow f) against the biasing force of the spring 16, the lock portion 13a of the claw lever 13 is By disengaging from the lock portion 12b, the fork 12 is rotated counterclockwise (see arrow g) by the urging force of the spring 16 to disengage the striker 5 (see FIG. 4B). Thereby, the seat back 2A is unlocked, and the seat back 2A can be moved forward to the forward position shown in FIG.

  As shown in FIGS. 6, 9, and 10, the insertion hole 11 a at the upper portion of the bracket 11 fixed to the left shoulder portion of the back frame 10 has a rectangular tube shape with the flange portion 19 a facing the outside of the skin of the seat back 2 </ b> A. The lower cylinder portion 19b of the bezel 19 is inserted from above, and the locking projections 19c at the left and right positions are locked by the lower surface of the insertion hole 11a, whereby the bezel 19 is fixed to the bracket 11.

  As shown in FIG. 11, the lock release knob 7 is formed with a push operation portion 7 c that fits in the bezel 19 and a lower cylinder portion 7 d that fits in a through hole 19 d of the bezel 19 so as to be movable up and down. .

  As shown in FIG. 12, a connecting rod 20 made of a synthetic resin (for example, POM, PAC) for connecting the unlocking knob 7 and the claw lever 13 is provided, and an upper upper end (the other end) of the connecting rod 20 is provided. A large first locking protrusion 20f and a pair of left and right small second locking protrusions 20b are integrally formed on 20a.

  The lower cylinder portion 7d of the unlocking knob 7 is formed with an insertion hole 7a into which the upper end portion 20a of the connecting rod 20 can be inserted, and a slit 7e through which the first locking projection 20f of the connecting rod 20 is inserted. And a locking hole 7b for locking the second locking projection 20b.

  Further, the through hole 19d of the bezel 19 is set to a minimum inner diameter D (see FIG. 9A) that can penetrate the first locking protrusion 20f and the second locking protrusion 20b of the connecting rod 20.

  The connecting rod 20 has a laterally lower end portion (one end portion) 20c formed with an insertion shaft portion 20d that is rotatably inserted from the side into a connecting hole (hole portion) 13b formed on the distal end side of the claw lever 13. In addition, when the insertion shaft portion 20d is inserted into the connection hole 13b of the claw lever 13 from the inside, the claw portion that is locked to the outer surface of the claw lever 13 while being bent and prevents the connection rod 20 from coming off in the anti-insertion direction. 20e is integrally formed.

  An arc portion 13c having a radius at the center point of the connecting hole 13b and a flat surface portion (peripheral portion) 13d continuous with the arc portion 13c are formed on the peripheral portion on the distal end side of the claw lever 13, and the connecting rod 20 The claw portion 20e is rotatable along the arc portion 13c, but when the claw portion 20e comes into contact with the flat surface portion 13d, the rotation of the connecting rod 20 is restricted. That is, as shown in FIG. 5, the connecting rod 20 is restricted from rotating in the A direction (forward) by the claw portion 20 e coming into contact with the flat surface portion 13 d. If there is no claw part 20e, as indicated by a two-dot chain line h, the claw part 20e rotates greatly in the A direction.

  The lock mechanism 6 is attached to the bracket 11 of the back frame 10 in advance, and in order to assemble the connecting rod 20 to the lock mechanism 6, referring to FIGS. 6 (a) and 6 (b), from the front of the back frame 10, First, the upper end portion 20a of the connecting rod 20 is inserted into the insertion hole 11a of the bracket 11 from below, and in this state, the insertion shaft portion 20d of the lower end portion 20c of the connecting rod 20 is inserted into the connection hole 13b of the claw lever 13 of the lock mechanism 6. When inserted from the inside (see arrows i in FIGS. 7 (a) and 8 (a)), the claw portion 20e of the lower end portion 20c is bent and locked to the outer surface of the claw lever 13, so that the connecting rod 20 is counteracted. It comes to be prevented from coming off in the insertion direction.

  Thereafter, after the upper end portion 20a of the connecting rod 20 is loosely fitted into the insertion hole 11a of the bracket 11, the bezel is inserted into the insertion hole 11a of the bracket 11 while the upper end portion 20a of the connecting rod 20 is passed through the through hole 19d of the bezel 19. 19 is inserted and fixed from above, and finally, the lower cylinder portion 7d of the unlocking knob 7 is inserted into the through hole 19d of the bezel 19 from above (see arrows j in FIGS. 7B and 8B). When the upper end 20a of the connecting rod 20 is inserted into the insertion hole 7a of the unlocking knob 7, the locking hole 7b is locked by the second locking protrusion 20b (this insertion and locking will be described later). The lock release knob 7 is fixed to the connecting rod 20. The lock release knob 7 is fitted in the bezel 19 so as to be movable up and down.

  When the lock release knob 7 is manually operated (push operation), the claw lever 13 rotates counterclockwise (see arrow f in FIG. 4A) against the urging force of the spring 16 via the connecting rod 20. When the lock part 13a of the claw lever 13 is released from the lock part 12b of the fork 12 by being operated, the fork 12 is rotated counterclockwise (see the arrow g in FIG. 4A) by the urging force of the spring 16. Since the striker 5 is disengaged (see FIG. 4B), the seat back 2A is unlocked and the seat back 2A can be moved forward to the forward position shown in FIG. it can.

  Here, when the upper end 20a of the connecting rod 20 is loosely fitted in the insertion hole 11a of the bracket 11, and then the upper end 20a of the connecting rod 20 is passed through the through hole 19d of the bezel 19, FIG. As described above, the through hole 19d of the bezel 19 is set to the minimum inner diameter D that can penetrate the first locking projection 20f and the second locking projection 20b of the connecting rod 20, so that there is no hindrance to the penetration operation. No.

  When inserting the lower cylinder portion 7d of the unlocking knob 7 into the through hole 19d of the bezel 19 from above as shown in FIGS. 13 (a) to 13 (b), first, the insertion hole 7a of the unlocking knob 7 is inserted. The connecting rod 20 is inserted into the upper end portion 20a. At this time, the first engaging projection 20f of the connecting rod 20 is slightly inserted into the lower end portion of the slit 7e of the unlocking knob 7, and the connecting rod 20 The lower end portion of the lower cylinder portion 7d of the unlocking knob 7 comes into contact with the second locking projection 20b.

  When the lock release knob 7 is further pushed down in this state, the connecting rod 20 is pushed down together with the second locking projection 20b at the lower end portion of the lower cylinder portion 7d of the lock release knob 7 as shown in FIG. Thus, the first locking projection 20f is stopped by the inner edge portion of the through hole 19d of the bezel 19.

  In this state, when the lock release knob 7 is further pushed down, the first locking projection 20f held by the inner edge of the through hole 19d of the bezel 19 is inserted into the slit 7e as shown in FIG. 13 (d). The lower cylindrical portion 7d is inserted into the through hole 19d while the second locking projection 20b is press-fitted into the insertion hole 7a, and the locking hole 7b of the lower cylindrical portion 7d is locked by the second locking projection 20b when the insertion is completed. As a result, the unlocking knob 7 is fixed to the connecting rod 20.

  With the vehicle seat back locking structure as described above, the first locking protrusion 20f and the second locking protrusion 20b are penetrated through the through hole 19d of the bezel 19 together with the upper end portion 20a of the connecting rod 20 made of synthetic resin. After that, when the insertion hole 7a of the lower cylinder part 7d of the unlocking knob 7 is inserted into the upper end part 20a of the connecting rod 20, the first locking projection 20f is stopped by the inner edge part of the through hole 19d of the bezel 19 In this state, the first locking projection 20f is inserted through the slit 7e, the second locking projection 20b is press-fitted into the insertion hole 7a, and the lower cylindrical portion 7d is inserted into the through hole 19d. The second locking protrusion 20b can be locked.

  Accordingly, since it is the inner edge of the through hole 19d of the bezel 19 that holds the first locking projection 20f of the connecting rod 20 that stops the connecting rod 20 from being lowered during assembly. Even if a compressive load is applied to the connecting rod 20 by input, the connecting rod 20 made of synthetic resin is not deformed. Therefore, the lock release knob 7 can be smoothly pressed into the connecting rod 20 made of cheap and lightweight synthetic resin. Since the unlocking knob 7 can be securely connected, there is no need to use an expensive and heavy iron connecting rod.

  Further, by inserting the lower cylinder portion 7d of the unlocking knob 7 into the through hole 19d of the bezel 19, the gap between the through hole 19d and the upper end portion 20a of the connecting rod 20 is narrowed [see FIG. 13 (d)]. The first locking projection 20f of the connecting rod 20 is locked by the inner edge portion of the through hole 19d of the bezel 19, and the upper end portion 20a of the connecting rod 20 is not likely to come off from the insertion hole 7a of the unlocking knob 7.

  Further, since the second locking projection 20b of the connecting rod 20 is locked by the locking hole 7b of the unlocking knob 7 when the insertion is completed, the connecting rod 20 can be securely connected so as not to come out of the unlocking knob 7. Become.

  In the above embodiment, the second locking projection 20b of the connecting rod 20 is locked by the locking hole 7b of the unlocking knob 7. However, the upper end of the connecting rod 20 is inserted into the insertion hole 7a of the unlocking knob 7. If 20a is directly press-fitted, the locking hole 7b and the second locking projection 20b can be omitted.

  The lock mechanism 6 of the above embodiment locks the seat back 2A in the upright position, but may be configured to lock in the forward-turned position.

  The lock mechanism 6 of the above embodiment is a type in which the fork 12 is released by operating the claw lever 13 with the connecting rod 20, but as in Patent Document 1, the lock cam is directly released with the release rod (connecting rod). It can also be applied to the type of operation.

BRIEF DESCRIPTION OF THE DRAWINGS It is a vehicle seat which concerns on embodiment of this invention, (a) is a perspective view of the forward position of a seat back, (b) is a perspective view of the standing position of a seat back. (A) is the principal part enlarged view of FIG.1 (b), (b) is the perspective view which looked at (a) from the left side. (A) is a perspective view of a lock mechanism, (b) is a principal part enlarged front view of (a). It is a locking mechanism, (a) is a front view at the time of locking, (b) is a front view at the time of unlocking. It is a front view of a connecting rod and a lock mechanism. (A) and (b) are exploded perspective views of a connecting rod, a bezel, and a lock release knob. It is a connection rod, a claw lever, and a lock release knob, (a) is an exploded side view, and (b) is an exploded front view. It is a connection rod, a claw lever, and a lock release knob, (a) is an assembly side view, (b) is an assembly front view. It is a bezel, (a) is a top view, (b) is a front view, (c) is a side view. It is a bezel, (a) is a perspective view, (b) is an AA line end view of FIG. 9 (a), (c) is an BB line end view of FIG. 9 (b). It is a lock release knob, (a) is a front view, (b) is a side view, (c) is a perspective view, (d) is a CC line end view of (a). It is a connection rod, (a) is a front view, (b) is a side view, (c) is a principal part perspective view. (A)-(d) is side surface sectional drawing of the procedure which inserts and fixes a lock release knob to a connection rod. It is a prior art, (a) is side sectional drawing which inserted and fixed the lock release knob to the connection rod, (b) is side sectional drawing of the procedure which inserts and fixes the lock release knob to a connection rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear seat 2A Seat back 5 Striker 6 Lock mechanism 7 Lock release knob 7a Insertion hole 7b Locking hole 7d Lower cylinder part 7e Slit 19 Bezel 19e Through hole 20 Connecting rod 20a Upper end part (end part)
20b 2nd latching protrusion 20f 1st latching protrusion

Claims (2)

A lock mechanism provided on the seat back side is engaged with a striker provided on the vehicle body side to lock the seat back to the vehicle body side, and by a push operation of a lock release knob connected to the lock mechanism via a connecting rod, A lock structure for a vehicle seat back that releases the engagement of the lock mechanism and unlocks the seat back,
The connecting rod is molded of synthetic resin, and a first locking projection is formed at the end connecting the unlocking knob, and can be moved up and down in a through hole of a bezel fixed to the seat back on the unlocking knob. A lower cylinder portion that fits into the inner cylinder, and an insertion hole into which the end of the connecting rod can be inserted and a slit through which the first locking projection is inserted are formed in the lower cylinder portion. The connecting rod is configured to have a minimum inner diameter through which the first locking projection can be penetrated. After assembling the first locking projection together with the end of the connecting rod through the through hole of the bezel, the connecting rod When inserting the insertion hole of the lower cylinder portion of the unlocking knob into the end of the first locking projection, the first locking projection is inserted into the slit with the first locking projection held against the inner edge of the through hole of the bezel, While pressing the end part into the insertion hole, Lock structure of a vehicle seat back, characterized in that the plug into through holes. A lock mechanism provided on the seat back side is engaged with a striker provided on the vehicle body side to lock the seat back to the vehicle body side, and by a push operation of a lock release knob connected to the lock mechanism via a connecting rod, A lock structure for a vehicle seat back that releases the engagement of the lock mechanism and unlocks the seat back,
The connecting rod is formed of a synthetic resin, and a first locking projection and a second locking projection are formed at an end connecting the unlocking knob, and a bezel fixed to the seat back on the unlocking knob. A lower cylinder portion that is fitted in the through hole of the first and second holes so as to be movable up and down, an insertion hole into which the end of the connecting rod can be inserted, a slit through which the first locking protrusion is inserted, and a second A locking hole for locking the locking projection is formed, and the through hole of the bezel is configured to have a minimum inner diameter that can penetrate the first locking projection and the second locking projection of the connecting rod. At the time of assembly, after passing the first locking projection and the second locking projection together with the end of the connecting rod through the through hole of the bezel, the insertion hole of the lower cylinder portion of the unlocking knob is formed at the end of the connecting rod. When inserting, the first locking projection is held against the inner edge of the through hole of the bezel Then, the first locking protrusion is inserted into the slit, the lower locking protrusion is press-fitted into the insertion hole, and the lower cylinder portion is inserted into the through hole. When the insertion is completed, the second locking protrusion is locked with the locking hole. A vehicle seat back locking structure characterized by that.

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