JPH0363884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a seat hinge structure, and includes, for example, a folded state in which the seat back is stacked on the seat bottom from its upright state, and a fully flat state in which it is placed behind the seat bottom. The present invention relates to a seat hinge structure that can be suitably applied to a rear seat of a van-type vehicle, etc., which can be switched between two positions.

(Prior art) Conventionally, in the rear seat of a van-type vehicle, by folding the seat back forward from its upright position, it can be brought into a folded state where it overlaps the seat bottom, and conversely, by folding it backward, it can be folded to a position behind the seat bottom. There are various known devices capable of creating a continuous full flat state, as disclosed in, for example, Japanese Unexamined Utility Model Publication No. 60-93527.
In the hinge structure of the seat back, the pivot axis when folding forward and the pivot axis when folding backward must be different, and the lock can be released by operating a separate control lever for each. It is configured so that it can be tilted forward or backward.

A specific example will be explained with reference to FIG. 7. Reference numeral 31 denotes a fixed member that is coupled to the seat bottom (not shown) and fixedly supported by the vehicle body, and the pivot shaft 32
An intermediate rotating member 33 is pivotally supported through the intermediate rotating member 33, and a support member 35 of a seat bag (not shown) is pivotally supported on this intermediate rotating member 33 via a pivot shaft 34.
A first lock pawl 36 that is rotatable about the pivot shaft 34 is attached to the intermediate rotating member 33, and its engaging portion 36a engages with an engaging recess 37 formed in the fixed member 31. The first operation lever 36b is aligned upwardly from the first lock pawl 36.
has been extended. Further, the support member 35 has a second lock pawl 3 that is rotatable around the pivot pin 35a.
8 is attached, its engaging portion 38a is engaged with the engaging recess 39 formed in the intermediate rotating member 33, and the second operating lever 38b is upwardly extended from the second lock pawl 38. It has been extended. Then, when the first operating lever 36b is rotated backward against the biasing force of the spring 36c, the first lock pawl 36
is disengaged, the intermediate rotation member 33 rotates rearward around the pivot shaft 32 together with the support member 35, the seat back is in a fully flat state connected to the seat bottom, and the second operating lever 38b is moved by the spring 38c.
When it rotates forward against the urging force of It is configured to be in the same state.

(Problems to be Solved by the Invention) By the way, in the above configuration, the first operating lever 36b
is rotated backward to connect the fixed member 32 and the intermediate rotating member 3.
If the second operation lever 38b is moved by mistake when the seatback is in a fully flat state with the seat back tilted backwards and the lock between
3 and the support member 35 is released, the locks of the two pivot parts supporting the seat back are both released, and the seat back becomes unable to be supported, resulting in a dangerous problem. Ta.

In view of the above-mentioned conventional problems, the present invention solves the problem that when the seat back is in a fully flat state with the seat back tilted backwards, the lock between the support member of the seat back and the intermediate rotating member may not be released unexpectedly, and the seat back may become unable to be supported. The purpose is to provide a hinge structure without seat.

(Means for Solving the Problems) In order to achieve the above object, the present invention pivots an intermediate rotating member to a fixed member coupled to a seat bottom, and also supports a seat back to the intermediate rotating member. between the fixed member and the intermediate rotating member and between the intermediate rotating member and the supporting member, the intermediate rotating member and the supporting member are respectively locked in an upright position and rotated in opposite directions. The first and second lock pawls are interposed to release the respective locks by moving the lock pawl, and the second lock pawl is moved in conjunction with the first lock pawl, and when the first lock pawl is in the unlocked position, the second lock pawl is moved. The present invention is characterized in that a lock release prevention piece is provided to prevent the lock pawl from being unlocked.

(Function) Since the present invention has the above configuration, when the lock by the first lock claw is released, the seat back is rotated rearward together with the support member and the intermediate rotating member, and the seat back is fully flat connected to the seat bottom. It can be a state. Further, when the lock by the second lock pawl is released, the seat back can be rotated forward together with the support member to be in a folded state with the seat bottom stacked on top. In the full flat state,
When the lock by the first lock pawl is released, the lock release prevention piece prevents the second lock pawl from being unlocked, so there is a possibility that the second lock pawl may be operated unexpectedly. However, it is safe because the lock will not be released and the seat bag will not become unsupportable.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6.

In FIGS. 1 to 4, reference numeral 1 denotes a fixed member that is connected to a seat bottom (not shown) and fixedly supported by the vehicle body, and an intermediate rotating member 3 rotates via a lower pivot shaft 2. It is freely supported.
Further, a lower end portion of a support member 5 of a seat bag (not shown) is pivotally supported on the upper part of the intermediate rotating member 3 via an upper pivot shaft 4. A first lock claw 6 rotatable around the upper pivot shaft 4 is attached to the intermediate rotating member 3, and the engaging portion 6a thereof
is engaged with an engagement recess 7 formed in the fixing member 1, and this first lock pawl 6 is engaged with a spring 8.
It is always energized towards the locked state.
Further, a second lock pawl 10 is attached to the support member 5 so as to be rotatable around the pivot pin 9, and an engaging portion 10a of the second lock pawl 10 is fitted into an engaging recess 11 formed in the intermediate rotating member 3. The second lock pawl 10 is always urged toward the locked state by a spring 12. The first lock pawl 6 and the second lock pawl 10 are configured to be unlocked by rotating in opposite directions, and in the illustrated example, the first lock pawl 6 and the second lock pawl 10 are 6 is configured such that its lock is released when it is rotated clockwise, and its lock is released when the second lock pawl 10 is rotated counterclockwise.
A lower end portion of the operating lever 13 is rotatably supported by an upper pivot shaft 4 that pivotally supports the intermediate rotating member 3 and the support member 5. An engaging piece 14 formed protruding from the first lock pawl 6 engages with this operating lever 13, and an engaging pin 15 protruding from this operating lever 13 engages with the second lock pawl 10.
When the operating lever 13 is turned backward and rotated clockwise, the first lock pawl 6 is also rotated clockwise, and vice versa. The second lock pawl 10 is also rotated counterclockwise when the lock is rotated counterclockwise. Further, a lock release prevention ring 16 is fitted onto the upper pivot shaft 4, and is configured to rotate integrally with the first lock pawl 6 by a pair of locking pieces 16a protruding from its outer periphery. It is locked to. The second lock pawl 10 is provided on the outer periphery of the lock release prevention ring 16.
An unlocking prevention piece 17 is provided so as to protrude from one side of the engaging portion 10a so that its tip abuts or approaches. On the other hand, the engaging portion 10 of the second lock pawl 10
An engaging protrusion 18 is provided protruding from one side of the distal end portion of a. As shown in FIG. 3, these lock release prevention pieces 17 and engaging protrusions 18
When they are in the locked state, they do not engage with each other, and as shown in FIG. 4, when the first lock pawl 6 rotates clockwise to the unlocked state, the unlocking prevention piece 17 engages with the engagement protrusion. 18 and the second
The lock pawl 10 is arranged to prevent the lock pawl 10 from rotating counterclockwise. A cover 19 is fixed to the support member 5, as shown by imaginary lines in FIG.
The relative rotation range of the operating lever 13 with respect to the support member 5 or the seat bag is restricted, and when the operating lever 13 is rotated, the support member 5 is rotated as it is after releasing the lock in the first stroke. It is configured so that it can be done.

In the above configuration, the operating lever 13 is
When facing forward and rotating counterclockwise as shown by arrow A in the figure, the second lock pawl 10 is rotated counterclockwise through the engagement pin 15 against the biasing force of the spring 12. Then, the intermediate rotation member 3 is disengaged from the engagement recess 11, and the support member 5 is unlocked. When the operating lever 13 is further rotated,
The support member 5 is rotated via the second lock pawl 10 or through the engagement of the operation lever 13 with a cover 19 fixed to the support member 5, and the fifth
As shown in the figure, the seat bag 22 rotates around the upper pivot shaft 4 and is in a folded state overlapping the seat bottom 21. During this operation, the engaging piece 14 of the first locking pawl 6 does not engage with the operating lever 13, so the first locking pawl 6 remains engaged with the engaging recess 7 of the fixing member 1. However, the intermediate rotating member 3 remains locked and maintains its upright state. Next, when the operating lever 13 is rotated in the direction of arrow C in FIG. The seat bag 22 is engaged with and locked in the engagement recess 11 of the intermediate rotating member 3, and the seat bag 22 is again locked in the upright state.

Next, when the operating lever 13 is rotated clockwise toward the rear as shown by arrow B in FIG.
The operating lever 13 rotates the first locking pawl 6 clockwise via the engaging piece 14 formed on the first locking pawl 6, so that the first locking pawl 6 engages with the engaging recess 7 formed on the fixing member 1. The lock of the intermediate rotation member 3 is released. As the first lock pawl 6 rotates, the lock release prevention ring 16 integrally rotates, and as a result, the lock release prevention piece 17 engages with the engagement protrusion 18 protruding from the second lock pawl 10. However, this second lock pawl 10 cannot be unlocked. Furthermore, when the operating lever 13 is rotated, the first
via the lock pawl 6 or the operating lever 13.
The support member 5 is rotated together with the intermediate rotation member 3 through the engagement of the cover 19, and the seat back 22 is rotated around the lower pivot shaft 2 and attached to the seat bottom 21, as shown in FIG. It becomes a continuous full flat state. In this state, even if a counterclockwise external force unexpectedly acts on the operating lever 13 and causes the second lock pawl 10 to rotate in the unlocking direction, the second lock pawl 10 will not move. Rotation is prevented by the lock release prevention piece 17, the lock is never released, and there is no danger that the seat bag 22 will not be able to be supported. Next, when the operating lever 13 is rotated in the direction of arrow D in FIG. It is engaged with the engagement recess 7 of the fixing member 1 with a biasing force of 8 and locked.

The present invention is not limited to the above-mentioned embodiments, and, for example, the shapes and pivot positions of the first and second lock claws, the shape and arrangement position of the engaging portion, etc. can be arbitrarily designed within the range that allows the above-mentioned operation to be achieved. Can be changed.
Further, the lock release prevention piece may be provided separately from the first lock pawl, but it may also be provided integrally with the first lock pawl.

(Effects of the Invention) According to the seat hinge structure of the present invention, as described above, the seat back can be rotated about two pivot axes that are configured to be lockable by the first and second locking claws. In a seat hinge structure configured to be able to rotate between a folded state where the seat is supported and stacked on the seat bottom and a fully flat state where the seat is connected to the rear of the seat bottom, the seat is locked by a first locking pawl in order to make the seat fully flat. When the lock is released, the lock release prevention piece prevents the second lock pawl from unlocking, so even if the second lock pawl is accidentally operated in the fully flat state, the lock will be released. Therefore, the support of the seat back is not disabled, and the great effect of providing a highly safe seat in a fully flat state is achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Figs. 3 and 4 are side views of the operating state of the same main parts, and Figs. 5 and 6 are the same. A side view showing the overall operating state, and FIG. 7 is a perspective view of the conventional example. DESCRIPTION OF SYMBOLS 1... Fixed member, 2... Lower pivot shaft, 3... Intermediate rotation member, 4... Upper pivot shaft, 5... Support member, 6... First lock claw, 10... Second 17... Lock release prevention piece, 18... Engaging protrusion.

Claims (1)

[Claims] 1 The intermediate rotating member is pivotally supported to the fixed member coupled to the seat bottom, and the support member of the seat back is pivotally supported to the intermediate rotating member, and the intermediate rotating member is supported between the fixed member and the intermediate rotating member. between the member and the support member, a first and a second member for locking the intermediate rotation member and the support member respectively in the upright position and releasing each lock by rotating in mutually opposite directions;
A lock release prevention piece is provided which interposes the lock pawl, moves in conjunction with the first lock pawl, and prevents the second lock pawl from being unlocked at the unlock position of the first lock pawl. The seat hinge structure is characterized by: