JP4870463B2 - 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 lock structure in which the lock mechanism (lock cam) is released by manual operation of a lock release knob (release knob) connected via a lock mechanism to unlock the seat back (Patent Document 1). reference).

Both the lock cam and the release rod are made of metal to maintain strength, and one end of the release rod is pivotally inserted into the hole of the lock cam from the side so that the release rod is connected to the lock cam. It has become.
JP-A-8-192668

  However, in Patent Document 1, there is a problem that the number of parts and the number of assembling steps increase because the release rod needs to be fitted to the release rod in order to prevent the release rod from coming off from the hole of the lock cam.

  In addition, since the lock cam and release rod are made of metal, abnormal noise is likely to occur when one end of the release rod rotates in the hole of the lock cam. There was a problem.

  The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the number of parts and the number of assembling steps, eliminate the need for countermeasures against abnormal noise, and improve the ease of assembling. The purpose is to provide a structure.

  In order to solve the above problems, the present invention engages a strike mechanism provided on the vehicle body side with a lock mechanism provided on the seat back side to lock the seat back to the vehicle body side, and a connecting rod is provided on the lock mechanism. The lock structure of the vehicle seat back is configured to unlock the seat back by releasing the engagement of the lock mechanism by manual operation of the unlocking knob connected via the one end of the connecting rod. The connecting rod is connected to the locking mechanism by being inserted into the hole of the locking mechanism so as to be pivotable from the side. The connecting rod is formed of synthetic resin, and one end of the connecting rod has a hole in the locking mechanism. A vehicular seat back characterized by integrally forming a claw portion that engages with a lock mechanism while being bent when inserted into the portion from the side, and prevents the connecting rod from coming off in the anti-insertion direction. There is provided a click structure.

  According to a second aspect of the present invention, when the connecting rod is about to rotate more than a predetermined amount in the hole of the lock mechanism, the claw portion abuts on the lock mechanism and restricts the rotation of the connecting rod beyond a predetermined amount. It is preferable to have a configuration that also serves as a rotation restricting portion.

  According to a third aspect of the present invention, the locking mechanism includes a fork that engages the striker and a claw lever that locks the fork at the engaging position, and the hole is formed in the claw lever, and the connection The structure which latches the nail | claw part of a rod to a claw lever is employable.

  According to a fourth aspect of the present invention, the claw portion can be configured to abut against the peripheral portion of the claw lever to restrict the rotation of the connecting rod.

  According to the present invention, the connecting rod is made of synthetic resin, and the claw portion is integrally formed with one end portion of the connecting rod, so that when the one end portion of the connecting rod is inserted into the hole portion of the lock mechanism from the side, the claw portion Since the connecting rod is locked to the anti-insertion direction with a single touch while being bent, there is no need to fit a retaining ring on the connecting rod. Can be reduced and the assemblability can be improved. In addition, since the connecting rod is made of synthetic resin, it is difficult for noise to occur when one end of the connecting rod rotates in the hole of the metal lock mechanism, so there is no need for noise countermeasures such as inserting a washer. In the case of a connecting rod made of metal (mainly iron), the bending position was limited or the bending accuracy was likely to vary. However, since it is a connecting rod made of synthetic resin, the bending position is limited. There is no variation in bending accuracy, and it becomes possible to mold into an ideal shape.

  If it is Claim 2, since the nail | claw part serves as the rotation control part which controls rotation of a connection rod, while it is not necessary to provide a rotation control member separately and rotation of a connection rod can be controlled, When attaching the unlocking knob to the other end of the connecting rod, it becomes easy to attach, so that the assembling property is improved.

  If it is Claim 3, it is applied also to the type which operates a claw lever with a connection rod, and releases a fork other than the type which releases a lock cam directly with a release rod (connection rod) like patent document 1. be able to.

  If it is Claim 4, in the type which operates a claw lever with a connection rod, a nail | claw part can be contact | abutted to the peripheral part of a claw lever, and rotation of a connection rod can be controlled.

  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.

  In the insertion hole 11a at the top of the bracket 11 fixed to the left shoulder portion of the back frame 10, as shown in FIGS. 6 (a) and 6 (b), a rectangular tubular bezel 19 facing the outside of the skin of the seat back 2A is located upward. The lock release knob 7 is fitted in the bezel 19 so as to be movable up and down.

  A connecting rod 20 made of synthetic resin (for example, POM, PAC) for connecting the unlocking knob 7 and the claw lever 13 is provided, and a locking projection 20b is formed on the upper upper end (the other end) 20a of the connecting rod 20. An insertion hole 7a into which the upper end portion 20a of the connecting rod 20 can be inserted is formed in the lower cylinder portion of the unlocking knob 7, and the upper end portion (the other end of the connecting rod 20 is connected to the insertion hole 7a. Part) A locking hole 7b is formed in which the locking projection 20b of the part 20a is locked.

  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.

  After that, the upper end portion 20a of the connecting rod 20 is loosely fitted into the insertion hole 11a of the bracket 11, the bezel 19 is inserted and fixed from above, and finally, the unlocking knob 7 is inserted into the bezel 19 from above (see FIG. 7 (b) and arrow j in FIG. 8 (b)], while the upper end portion 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 locking projection 20b. As a result, the unlocking 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.

  In the vehicle seat back locking structure as described above, the connecting rod 20 is made of synthetic resin, and the lower end 20c of the connecting rod 20 is integrally formed with the lower end 20c of the connecting rod 20. When the claw lever 20e is bent and inserted into the connecting hole 13b of the claw lever 13 of the lock mechanism 6 from the side, the claw portion 20e is locked to the claw lever 13 so that the connecting rod 20 is prevented from coming off in the anti-insertion direction with one touch. Therefore, since it is not necessary to fit the retaining ring to the connecting rod 20, the number of parts and the number of assembling steps can be reduced, and the assembling property is improved.

  Further, since the connecting rod 20 is made of synthetic resin, noise is less likely to occur when the insertion shaft portion 20d of the lower end portion 20c of the connecting rod 20 rotates in the connecting hole 13b of the metal claw lever 13, so that the washer In the case of connecting rods made of metal (mainly iron), bending positions are limited and bending accuracy is likely to vary. Since it is a connecting rod, there is no restriction on the bending position, there is no variation in bending accuracy, and it can be formed into an ideal shape.

  Further, the claw portion 20 e of the connecting rod 20 also serves as a rotation restricting portion that restricts the rotation of the connecting rod 20.

  That is, there is little problem when the lock mechanism 6 is attached to the bracket 11 of the back frame 10 in advance. However, the locking mechanism 6 is not attached to the bracket 11 of the back frame 10 in advance, and the insertion shaft portion 20d of the connecting rod 20 is inserted in advance into the connecting hole 13b of the claw lever 13 of the locking mechanism 6 from the inside, so that the claw portion When the upper end 20a of the connecting rod 20 is inserted into the insertion hole 11a of the bracket 11 from below with the anti-insertion direction of the connecting rod 20 prevented by 20e, and then the lock mechanism 6 is attached to the bracket 11 of the back frame 10. If the lock mechanism 6 is simply held by hand, the connecting rod 20 will rotate greatly in the direction A as shown by a two-dot chain line h in FIG. It becomes difficult.

  In such a case, the claw portion 20e of the connecting rod 20 also serves as a rotation restricting portion that restricts the rotation of the connecting rod 20, so that when the lock mechanism 6 is held by hand, the connecting rod 20 is not shown in FIG. As indicated by the two-dot chain line h, even if the rotation of the connecting rod 20 is restricted by the claw portion 20e even if it tries to rotate greatly in the direction A, the connecting rod 20 is inserted into the insertion hole 11a of the bracket 11. It becomes easy to insert.

  Accordingly, since the claw portion 20e of the connecting rod 20 also serves as a rotation restricting portion that restricts the rotation of the connecting rod 20, there is no need to provide a separate rotation restricting member, and the rotation of the connecting rod 20 can be restricted. Therefore, the connecting rod 20 can be easily inserted into the insertion hole 11a of the bracket 11 and can be easily attached when the unlocking knob 7 is attached to the upper end portion 20a of the connecting rod 20, so that the assembling property is improved.

  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 the lock mechanism which shows the rotation state of a connecting rod. (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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear seat 2A Seat back 5 Striker 6 Lock mechanism 7 Lock release knob 12 Fork 13 Claw lever 13b Connection hole (hole part)
20 Connecting rod 20a Upper end (other end)
20c Lower end (one end)
20d Insertion shaft part 20e Claw part

Claims (4)

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 manual 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,
One end of the connecting rod is inserted into the hole of the lock mechanism so as to be pivotable from the side, and is connected to the lock mechanism. The connecting rod is formed of synthetic resin and is connected to one end of the connecting rod. The vehicle is characterized in that the portion is integrally formed with a claw portion that engages with the lock mechanism while being bent when inserted into the hole of the lock mechanism from the side, and prevents the connecting rod from coming off in the anti-insertion direction. Seat back lock structure.   The claw portion also serves as a rotation restricting portion that contacts the lock mechanism and restricts the rotation of the connecting rod beyond a predetermined level when the connecting rod tries to rotate more than a predetermined amount in the hole of the lock mechanism. The vehicle seat back locking structure according to claim 1, wherein:   The locking mechanism includes a fork that engages a striker and a claw lever that locks the fork in the engaging position, the hole is formed in the claw lever, and the claw portion of the connecting rod is a claw lever. The vehicle seat back locking structure according to claim 1, wherein the vehicle seat back locking structure is engaged with the vehicle seat back.   4. The vehicle seat back locking structure according to claim 3, wherein the claw portion abuts on a peripheral portion of the claw lever to restrict rotation of the connecting rod. 5.

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