JP3890632B2 - Folding vehicle seat locking mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a folding mechanism for a folding vehicle seat.
[0002]
[Prior art]
As one type of folding vehicle seat locking mechanism, as shown in Japanese Utility Model Publication No. 6-9888, the rear end portion of a seat cushion is supported on the vehicle body floor so that the front end portion can be pivoted in the vertical direction. And a locking mechanism for fixing a rear end portion of the seat cushion to the vehicle body floor.
[0003]
The lock mechanism includes a pair of lock bases that are assembled to the rear end of the seat cushion so as to be pivotable in the front-rear direction and are opposed to each other, and a lock plate that is pivotally supported between the two lock bases. A pole that is rotatably supported between the lock bases and engages and disengages the lock plate; a spring member that urges and engages the pole and the lock plate; and A release lever that rotates against the member to be released from the lock plate, and can be pivoted to a part that is deviated from the pivot center of the seat cushion and a part that is deviated from the pivot center of both lock bases. The lock base is provided with a link that rotates to the lock position when the seat cushion is seated and to the storage position when inverted. To have.
[0004]
In the lock mechanism, the lock plate and the pawl are releasably hooked on a striker provided on the vehicle body floor, and a rear end portion of the seat cushion is fixed to the vehicle body floor. By releasing the release lever, the pole is detached from the lock plate to release the hooked state with the striker, allowing the seat cushion to be tilted forward, and when the seat cushion is tilted forward, the link acts The lock mechanism is rotated and retracted to be stored in the storage position.
[0005]
[Problems to be solved by the invention]
By the way, in the lock mechanism of the above-mentioned type, when the positional relationship with the striker disposed on the vehicle body floor is not accurate, the locking mechanism is not reliably engaged with the striker, and the above-described positional relationship is greatly deviated. In some cases, it cannot be locked.
[0006]
Therefore, strict accuracy control is required for the assembly accuracy of the lock mechanism to the seat cushion, the dimensional accuracy of the components of the lock mechanism, the assembly accuracy, the assembly accuracy of the striker to the vehicle body floor, etc. If it cannot be locked, the lock mechanism and / or the slicer must be reassembled. Each of the above-described accuracy management of the lock mechanism requires a high management cost, and an extra cost is required for reworking the assembly of the lock mechanism or striker.
[0007]
Accordingly, an object of the present invention is to eliminate precision management such as strict dimensional accuracy and assembly accuracy in a lock mechanism of the type described above, and to eliminate reworking of assembly.
[0008]
[Means for Solving the Problems]
The present invention relates to a folding vehicle seat locking mechanism, and in particular, it is assembled to a rear end portion of a seat cushion supported on a vehicle body floor so that a front end portion is rotatable in a vertical direction so as to be rotatable in a front-rear direction. A pair of lock bases facing each other, a lock plate rotatably supported between the lock bases, and a lock plate rotatably supported between the lock bases to engage and disengage the lock plate. And a spring member that urges and engages the pole and the lock plate with each other, a release lever that rotates the pole against the spring member and separates it from the lock plate, and a seat cushion The seat cushion is connected to a portion displaced from the center of rotation and a portion displaced from the center of rotation of the two lock bases so as to be rotatable. A link that pivots to the locked position when in the sitting position and pivots to the retracted position when inverted to the front, and is releasably hooked to the striker provided on the vehicle body floor by the cooperative action of the lock plate and the pole. Thus, a folding mechanism for a folding vehicle seat in which the rear end portion of the seat cushion is fixed to the vehicle body floor is applied.
[0009]
Thus, in the locking mechanism of the above-described type, the present invention provides a connecting elongated hole extending in the longitudinal direction at the rear end portion of the link, and the connecting elongated hole on one side surface of the both lock bases. A connecting pin that is rotatably and movably inserted is provided, and the connecting pin is inserted into the long hole for connecting the link, and a pair of compression springs are interposed in the front and back of the connecting pin in the long hole for connecting. In this state, the link is connected to the lock base.
[0010]
[Operation and effect of the invention]
In the foldable vehicle seat provided with the lock mechanism configured as described above, the seat cushion is in a horizontal state when it can be seated, and the lock mechanism is disposed on the vehicle floor like the conventional lock mechanism. The vehicle seat is fixed to the vehicle body floor.
[0011]
In order to fold the vehicle seat in this state, the seat back is laid down on the seat cushion, and the lock mechanism is operated to release the striker from the striker so that the seat cushion is inverted forward together with the seat back. . As a result, the vehicle seat is folded in a forwardly inverted state, and the lock mechanism is retracted from the protruded state and stored by the action of the link.
[0012]
Further, in order to return the vehicle seat in the inverted state to the seatable state, the seat cushion in the inverted state is rotated backward together with the seat back to return to the horizontal state. Thereby, the lock mechanism is rotated by the action of the link, returns to the lock position, opposes the watermelon on the vehicle body floor side, is hooked on the striker, and fixes the vehicle seat to the vehicle body floor.
[0013]
Thus, in the lock mechanism, a long connecting hole extending in the longitudinal direction is provided at the rear end portion of the link, and at the one side surface of the both lock bases, the long connecting hole is rotatable and movable. In the state where a connecting pin to be inserted is provided, the connecting pin is inserted into the connecting elongated hole of the link, and a pair of compression springs are interposed in front and rear portions of the connecting pin in the connecting elongated hole. Is connected to the lock base.
[0014]
For this reason, in the state where the lock mechanism is returned to the lock position, the connection pin provided on the lock base resists each compression spring interposed in the connection long hole of the link, and A predetermined amount can be moved in the longitudinal direction, and the lock mechanism can be rotated in the longitudinal direction of the link by the movement of the connecting pin.
[0015]
Therefore, when the positional relationship between the lock mechanism and the striker is slightly deviated and the striker does not smoothly enter the lock base and collides, the lock mechanism rotates in the front-rear direction by this collision force. The positional deviation between the striker and the striker is corrected so that the two can be hooked and the locking mechanism is securely hooked to the striker. For this reason, in the lock mechanism, accuracy management such as strict dimensional accuracy and assembly accuracy with respect to the lock mechanism and the striker is not required, and an assembling work is not required.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows a folding vehicle seat provided with a lock mechanism according to an example of the present invention.
[0017]
The seat 10 includes a seat cushion 11 and a seat back 12 that is assembled at the rear end thereof so as to be rotatable in the front-rear direction via a reclining mechanism (not shown). In the seat 10, a lower portion of the front end of the seat cushion 11 is supported by a seat leg 13 provided on the vehicle body floor via a support pin 14 so as to be vertically rotatable. Further, a lock mechanism 20 described later is assembled to the lower portion of the rear end of the seat cushion 11, and is fixed to the vehicle floor by the lock mechanism 20 so as to be releasable.
[0018]
Therefore, if the lock mechanism 20 is unlocked to release the lower part of the rear end of the seat cushion 11 to the vehicle body floor, both the seat cushion 11 and the seat back 12 are laid down on the seat back of the seat cushion 11. In this state, as shown by a two-dot chain line, it can be rotated forward and folded into an inverted state.
[0019]
As shown in FIGS. 2 and 3, the lock mechanism 20 includes a pair of lock bases 21 and 22, a lock plate 23, a pole 24, a release lever 25, a tension spring 26, and a link 27 facing each other. Except for the connecting structure of the link 21 and the link 27, it is configured in the same manner as a conventionally known lock mechanism.
[0020]
In the lock mechanism 20, the lock bases 21 and 22 are supported by a cushion frame (not shown) of the seat cushion 11 so as to be pivotable in the front-rear direction, and face each other. The pole 24 is rotatably supported via support pins 28a and 28b. The release lever 25 is fixed to the pole 24, and is supported so as to be rotatable integrally with the pole 24 via a support pin 28a.
[0021]
A tension spring 26 is engaged with the lock plate 23 and the release lever 25. The lock plate 23 and the pole 24 are engaged with each other by the urging force of the tension spring 26, and a striker 23a of the lock plate 23 is used as a striker. 15 is hooked. The striker 15 protrudes from the lower surface of the rear end portion of the seat cushion 11 on the vehicle body floor and enters from the openings 21 a and 22 a that expand below the lock bases 21 and 22. It is hooked on the hook part 23a.
[0022]
The release lever 25 is connected to an operation lever (not shown) provided on the seat cushion 11 side via an operation wire 25a, and rotates by the operation of the operation lever to rotate the pole 24. As a result, the pole 24 rotates counterclockwise as shown by a two-dot chain line in FIG. 3 and disengages from the engaging portion 23b of the lock plate 23. The lock plate 23 is moved by the action of the tension spring 26. Following the pole 24, it rotates counterclockwise and the hooked state on the striker 15 is released.
[0023]
The link 27 is long, and the front end is rotatably connected to a portion of the seat leg 13 that is displaced from the support pin 14, and the rear end is connected to a connecting pin 21 b provided on the lock base 21, which will be described later. It is connected using a connecting structure. The connecting pin 21b is offset from the rotation fulcrum P of the lock bases 21 and 22, and the link 27 pulls the lock bases 21 and 22 when the seat cushion 11 is inverted forward. 1 functions in order to retract and store the lock mechanism 20 in a state protruding from the seat cushion 11.
[0024]
In the link 27, as shown in FIGS. 2 and 4 to 6, a connecting long hole 27a having a predetermined length extending in the longitudinal direction is formed at the rear end portion thereof. The guide member 27b is fitted and fixed. The guide member 27b includes a long hole 27c having a shape similar to that of the connecting long hole 27a.
[0025]
On the other hand, the connecting pin 21b provided on the lock base 21 is inserted into the elongated hole 27c of the guide member 27b with the bush 21c fitted to the outer periphery thereof, as shown in FIGS. It is secured by an E-ring 21d fitted to the part. In addition, compression springs 27d and 27e are interposed in front and rear portions of the bush 21c in the elongated hole 27c of the guide member 27b, respectively. In this state, the connecting pin 21b can be rotated in the bush 21c, and the compression springs 27d and 27e are bent via the bush 21c, so that the connecting pin 21b extends in the longitudinal direction in the elongated hole 27c of the guide member 27b. A predetermined amount can be moved.
[0026]
In the folding vehicle seat 10 provided with the lock mechanism 20 configured as described above, the seat cushion 11 is in a horizontal state as shown by the solid line in FIG. 1, and the lock mechanism 20 is the vehicle body as in the conventional lock mechanism. The vehicle seat 10 is fixed to the vehicle body floor by being hooked on a striker 15 disposed on the floor.
[0027]
Further, in order to fold the vehicle seat 10 in this state, the seat back 12 is laid down on the seat cushion 11 as shown by a one-dot chain line in FIG. 1, and the lock mechanism 20 is operated by operating an operation lever (not shown). When the release lever 25 is rotated via the wire 25a, the pole 24 is rotated and separated from the lock plate 23, and the lock plate 23 is rotated following the pole 24 to be detached from the striker 15. .
[0028]
As a result, the seat cushion 11 can be turned forward together with the seat back 12 as shown by the two-dot chain line in FIG. 1, so that the vehicle seat 10 is folded forward and the link 27 As a result, the lock mechanism 20 is retracted and housed from the state of rotating and protruding.
[0029]
Further, in order to return the vehicle seat 10 in the inverted state to a seatable state, the seat cushion 11 in the inverted state indicated by a two-dot chain line in FIG. Return to. As a result, the lock mechanism 20 is rotated by the action of the link 27 to return to the locked position, oppose the striker 15 on the vehicle body floor side, and is hooked on the striker 15 to fix the vehicle seat 10 to the vehicle body floor.
[0030]
Therefore, in the connecting portion between the link 27 and the lock base 21 of the lock mechanism 20, the compression pins 27 d and 27 e in which the connecting pin 21 b provided on the lock base 21 is interposed in the elongated hole 27 c of the link 27. Against this, it is possible to move a predetermined amount in the longitudinal direction of the long hole 27c, and the lock mechanism 20 can be rotated in the longitudinal direction of the link 27 by a movement of the connecting pin 21b.
[0031]
Therefore, when the positional relationship between the lock mechanism 20 and the striker 15 is slightly shifted and the striker 15 does not smoothly enter the lock bases 21 and 22 from the openings 21a and 22a, The lock bases 21 and 22 are rotated in the front-rear direction by the collision force, so that the positional deviation between the lock mechanism 20 and the striker 15 is corrected. The striker 15 is securely hooked.
[0032]
For this reason, the lock mechanism 20 does not require strict dimensional accuracy and assembly accuracy control for the lock mechanism 20 and the striker 15, and also eliminates the need for reworking the assembly.
[0033]
FIG. 7 schematically shows the positional relationship between the lock mechanism 20 and the striker 15, and in FIG. 7A, when the lock mechanism 20 is displaced backward relative to the striker 15, FIG. 4B shows the case where the positional relationship between the two 15 and 20 is the same, and FIG. 4C shows the case where the lock mechanism 20 is relatively displaced forward.
[0034]
Among these states, the state shown in FIG. 7B is a case where the positional relationship between the lock mechanism 20 and the striker 15 is the same. In this state, the connecting pin 21b is connected to the long hole 27c of the link 27. Located in the approximate center. Further, in the state shown in FIG. 5A, the connecting pin 21b is moved to the left end portion of the elongated hole 27c, and the positional relationship is corrected. Furthermore, in the state shown in FIG. 7C, the connecting pin 21b is moved to the right end portion of the elongated hole 27c and the positional relationship is corrected.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a folding vehicle seat provided with a lock mechanism according to an example of the present invention.
FIG. 2 is a front view of the locking mechanism.
FIG. 3 is a front view of the lock mechanism with a front lock base removed.
FIG. 4 is an exploded partial perspective view showing a rear end portion of a link in the lock mechanism.
FIG. 5 is a longitudinal sectional view of a connecting portion between a lock base and a link of the lock mechanism.
FIG. 6 is a cross-sectional view of a connecting portion between the lock base and the link of the lock mechanism.
FIG. 7 is a schematic view showing a positional relationship between the lock mechanism and the striker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Folding vehicle seat, 11 ... Seat cushion, 12 ... Seat back, 13 ... Seat leg, 14 ... Support pin, 15 ... Striker, 20 ... Lock mechanism, 21, 22 ... Lock base, 21a, 22a ... Opening , 21b ... connecting pin, 21c ... bush, 21d ... E ring, 23 ... lock plate, 23a ... hook part, 23b ... engagement part, 24 ... pole, 25 ... release lever, 25a ... operation wire, 26 ... tension spring, 27 ... Link, 27a ... Elongation hole for connection, 27b ... Guide member, 27c ... Elongation hole, 27d, 27e ... Compression spring, 28a, 28b ... Support pin, P ... Rotation fulcrum.

Claims (1)

A pair of lock bases, which are rotatably mounted in the front-rear direction on the rear end of the seat cushion, which is supported on the floor of the vehicle body so that the front end is rotatable in the vertical direction, and between the lock bases. A lock plate supported rotatably, a pole supported rotatably between the lock bases to engage with and disengage from the lock plate, and a bias plate engaged with the lock plate to engage with each other. A spring member to be moved, a release lever for rotating the pole against the spring member to disengage from the lock plate, a portion deviated from a rotation center of the seat cushion, and a rotation center of the lock bases The lock base is pivotally connected to a portion displaced from the base, and the lock base is rotated to the locked position when the seat cushion is in the sitting position and is stored when the seat is inverted forward. A fold that includes a link that pivots to the vehicle body and is releasably hooked to a striker provided on the vehicle body floor by the cooperative action of the lock plate and the pole, and the rear end portion of the seat cushion is fixed to the vehicle body floor In the vehicle seat locking mechanism, a connecting elongated hole extending in the longitudinal direction is provided at the rear end of the link, and the connecting elongated slot is rotatable and movable on one side surface of the two lock bases. The link is provided with a connecting pin to be inserted, and the connecting pin is inserted into the connecting elongated hole of the link, and a pair of compression springs are interposed in front and rear portions of the connecting pin in the connecting elongated hole. A foldable vehicle seat locking mechanism, wherein:

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