JP2576928Y2 - Locking device for restraining the seat back from falling forward - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for restricting a seat back from falling forward in a vehicle seat, and more specifically, a locking device for restricting a seat back from falling forward by locking a seat back capable of falling forward to a seat cushion. It is about.

[0002]

2. Description of the Related Art Conventionally, a seat in which a seat back falls forward is known, and the configuration of such a locking device for restricting the seat back from falling forward will be described with reference to FIG.

In the seat back 1, an arm 3 extending from the lower portion of the back frame 2 of the seat back 1 along the side surface of the seat cushion 4 is formed integrally with the back frame 2, and the base end of the arm 3 is The arm 3 is rotatably mounted on the cushion frame 5 and is attached to the seat cushion 4 so as to be able to fall forward around a hinge 10 ′ which is a base end of the arm 3.

[0004] The seat back 1 and the seat cushion 4 are provided with a locking device for restricting the seat back 1 from falling forward by locking the seat back 1 to the seat cushion 4. Such a locking device is a seat back 1
Lock bracket 6 fixed to the upper end of arm 3
The hook 7 is rotatably mounted on the seat cushion 4, and a locking portion 8 formed of a square window for locking the hook 7 is formed on the cushion frame 5 of the seat cushion 4. 8 to prevent the seat back 1 from falling forward.

[0005] The lock bracket 6 of the seat back 1 is provided with an absorbing elastic body 9 made of rubber for preventing rattling between the hook pieces 7 and the locking portions 8. It is in contact with the cushion frame 5.

The hook 7 is urged by a tension spring (not shown) in a direction in which the hook 7 is engaged with the engaging portion 8 of the cushion frame 5.

Accordingly, since the hooks 7 of the seat back 1 are locked to the locking portions 8 of the cushion frame 5, the seat back 1 is prevented from falling forward. When the operation lever 10 of the hook 7 is operated in the direction of the arrow shown in the figure, the hook 7 rotates to release the locked state with the locking portion 8, and the arm 3 rotates about the hinge 5. Fall forward.

[0008]

In the lock device for restricting forward fall of the above construction, an elastic member 9 is provided on the lock bracket 6 of the seat back 1 in order to prevent the hook 7 and the locking portion 8 from rattling. The elastic body 9 is in contact with the cushion frame 5 of the seat cushion 4, but since the elastic body 9 is in contact with the cushion frame 5 in an inclined state, the line X in the load direction on the elastic body 9 and the seat A deviation of α degrees is generated between the elastic member 9 and the line Y of the rotational path of the elastic body 9 that rotates together with the back 1.

For this reason, a force is exerted on the elastic body 9 so that the seat back 1 falls down in the rearward direction.
The amount of deflection is small only by the amount of deflection of “a”.
The backlash cannot be absorbed, and the locking portion 8 and the hook 7 are backlashed, resulting in an unpleasant hitting sound. In particular, since the locking portion 8 and the hook 7 are made of metal, the hitting sound is uncomfortable.

Further, since the hook 7 is locked to the locking portion 8 formed on the cushion frame 5 of the seat cushion 4, the operating lever 10 of the hook 7 protrudes greatly in the back and back direction of the seat back 1, It didn't look good.

Therefore, the present invention is to prevent rattling between the locking portion and the hook, thereby preventing the occurrence of a tapping sound.

[0012]

In order to achieve the above-mentioned object, a locking device for restraining a seat back from falling forward according to the present invention comprises a locking portion of a seat cushion, and a contact sound between the locking portion and a hook piece. A cushioning material is provided to prevent the occurrence of cracks, and the seat back comes into contact with the locking portion at right angles to the line connecting the pivoting portion of the arm and the locking portion, and there is play between the hook and the locking portion. And an elastic elastic body with backlash for preventing the vibration.

[0013]

[Function] The absorbing elastic body with backlash abuts at right angles to the locking portion with respect to the line connecting the pivot portion of the arm and the locking portion, so that the load of the occupant is generated in the seat back in the rear direction. Even so, the amount of deflection of the elastic body can be sufficiently ensured, the gap between the locking portion and the hook can be prevented, the backlash between the locking portion and the hook can be prevented, and Is provided with a cushioning material, so that no hitting sound is generated even if the hook piece comes into contact with the locking portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS. 1 to 9. FIGS. 1 to 5 show the first embodiment, FIGS.
8 and 9 show a second embodiment, and FIGS. 8 and 9 show a third embodiment.

First, a first embodiment will be described with reference to FIGS. In the figure, reference numeral 11 denotes a side frame, which is disposed along both side portions of the seat cushion 12 and is connected to a side frame (not shown) on the other side by a connection pipe 13.

At substantially the center of the side frame 11 in the longitudinal direction, the seat back 14 extends along the side frame 11.
A base end 16 a of an arm 16 extending from the frame 15 is rotatably mounted, and the seat back 14 is tilted forward about the base end 16 a of the arm 16.

The base end 16a of the arm 16 is rotatably attached to a nut-attached plate 20 fixed to the side frame 11 by a hinge bolt 22 via a spacer 21.

A locking device for preventing the seat back 14 from falling forward is provided at the rear portion of the side frame 11 in the longitudinal direction and the arm 16 of the seat back 14 so as to lock the seat back 14 to the seat cushion 12. I have.

In this locking device, a hook 18 is rotatably attached to the arm 16 of the seat back 14, and the hook 1 is
8 is fixed to the rear portion of the side frame 11 of the seat cushion 12, and the hook 18 is
To prevent the seat back 14 from falling forward.

As shown in FIG. 3, the locking portion 19 is formed of a pipe fixed to the side frame 11, and a cylindrical cushioning member 23 made of resin is attached to the outer peripheral surface of the locking portion 19. A depression 19a for preventing the buffer material 23 from dropping is formed in the circumferential surface of the locking portion 19 along the circumferential direction.
A projection 23a formed on the inner peripheral surface of the cushioning material 23 is engaged with the dent 19a of the ninth, thereby preventing the cushioning material 23 from falling off from the locking portion.

The buffer member 23 has a cylindrical shape whose inner diameter is larger than the outer diameter of the locking portion 19, and has a slit 23b formed in the longitudinal direction. As a function.

The hook 18 has a central portion 18a
Is rotatably attached to the upper end 16b of the
8 b is urged by a tension spring 24 so as to be locked to the locking portion 19. Therefore, the hook piece 18 is the hook portion 18b.
Is locked to the locking portion 19 via the buffer member 23, and when the operation lever 18c of the hook piece 18 is operated, the hook piece 18 rotates about the shaft 25 of the central portion 18a, and the hook of the hook piece 18 Part 1
8b is retracted from the locking portion 19 to release the locked state, so that the seat back 14 can fall forward.

Further, the arm 16 of the seat back 14 is provided with a play-absorbing elastic body 26 for preventing play of the hook piece 18 and the locking portion 19. The elastic body 26 is attached to a lock bracket 27 fixed to the upper end 16 b of the arm 16 of the seat back 14.
At the position perpendicular to the straight line connecting the hinge bolt 22 and the locking portion 19 at the base end 16a of the arm 16 when the locking is performed, the arm 16 is in contact with the locking portion 19 via the buffer material 23.
That is, the elastic body 26 is connected to the rotation center of the arm 16 and the locking portion 19.
It is attached to the lock bracket 27 at right angles to the straight line connected to the lock bracket 27.

The lock bracket 27 includes a storage portion 27a for storing the elastic body 26 and a horizontal pipe 15 for forming the frame 15 of the seat back 14 formed on the storage portion 27a.
a, and the storage portion 27a is fixed to the arm 16. As shown in FIG. 4, the storage portion 27a of the lock bracket 27 has a blocking piece 27c for preventing the elastic body 26 from moving upward and a left and right elastic portion shown in FIG. Protrusions 27d, 27d for preventing the body 26 from moving in the horizontal direction are formed, and engagement holes 27e, 27e with which the elastic body 26 is engaged are formed on the left and right sides of the storage portion 27a. The lower part of 26 protrudes downward from the storage part 27a and contacts the locking part 19.

The elastic body 26 is made of rubber, and has left and right sides formed with protrusions 26a, 26a which engage with the engaging holes 27e, 27e of the storage portion 27a. When the hook 18 is locked to the locking portion 19, the elastic body 26 abuts on the locking portion 19 at right angles from directly above the locking portion 19, and the lower portion of the elastic body 26 is bent by the locking portion 19, and The play between the stop portion 19 and the hook piece 18 is absorbed.

The shaft 25 of the hook 18 is rotatably mounted on the arm 16 through a shaft hole 28 formed in the storage portion 27a of the lock bracket 27. Reference numeral 29 denotes a hinge cover, which covers the arm 16.

According to the lock device having the above-described configuration, the elastic body 26 abuts the locking portion 19 from right above at right angles, so that the amount of bending of the elastic body 26 can be sufficiently ensured. For this reason, the play between the locking portion 19 and the hook 18 can be absorbed by the elastic body 26, so that the hook 18 does not rattle on the locking portion 19.

The hook 18 has a hook portion 18b formed of the cushioning material 2.
3 and the hook portion 18b.
The hitting sound between the lock member 19 and the locking portion 19 can be prevented.

Since the hook 18 is locked to the locking portion 19 fixed to the side frame 11 to restrict the seat back 14 from falling forward, the operating lever 18c of the hook 18 protrudes largely outward. Not even. Therefore, the external appearance is improved.

Further, since the buffer member 23 is formed with the slit 23b and has a function as a spring, the rattling of the hook piece 18 can be absorbed by the buffer member 23 as well.

The guide portion 27b of the lock bracket 27
Is arranged along the frame 15 of the seat back 14, so that the load from the seat back 14 is
7 occurs in the elastic body 26. Therefore, the load from the seat back 14 is absorbed by the elastic body 26,
The backrest feeling of the seat back 14 is improved.

Next, a second embodiment will be described with reference to FIGS. Since the lock device shown in the second embodiment has substantially the same configuration as the lock device described in the first embodiment, a configuration different from the first embodiment will be described, and the other components will be the same as those in the first embodiment. The reference numerals are used, and the description is omitted.

The locking portion 39 is formed of a flanged pipe having a flange portion 39a formed at the tip thereof for preventing the buffer material 33 from dropping off. The cylindrical buffer material 33 is attached to the peripheral surface of the locking portion 39.

The lock bracket 37 has a storage portion 37a into which the elastic member 36 is fitted. The lower portion 36a of the elastic member 36 is fitted into the storage portion 37a by projecting downward. It is in contact with the locking portion 39 via the buffer material 33.

Further, a hook 38 is attached to the lock bracket 37.
A protrusion 37b is formed to lock one end 34a of the tension spring 34 that urges the hook portion 38a in the direction of locking to the locking portion 39. One end 34a of the tension spring 34 is locked to the protrusion 37b. ing.

The hook 38 is pivotally attached to the upper end 16b of the arm 16 via the lock bracket 37, and the hook 38
A connecting member 35a made of a pipe is attached to the shaft 35 via a spacer 35b.

According to the second embodiment, the hook 38 of the hook 38
In the state in which a is locked to the locking portion 39, as in the first embodiment, the elastic member 36 is locked at a position orthogonal to a straight line connecting the hinge bolt 22 of the arm 16 and the locking portion 39. 39
The amount of deflection of the elastic body 36 in contact with the elastic member 36 can be sufficiently ensured, and the play of the locking portion 39 and the hook piece 38 can be absorbed by the elastic body 36.

Next, a third embodiment will be described with reference to FIGS. The lock device shown in the third embodiment has substantially the same configuration as the lock device described in the second embodiment,
Since the configuration of the operation lever of the hook is different from that of the second embodiment, a configuration different from that of the second embodiment will be described, and the other components will be denoted by the same reference numerals as those of the second embodiment, and description thereof will be omitted. .

The operation lever 18c of the hook 18 is bent in an L-shape.
0 is inserted. The guide 40 is located at the upper end 16 of the arm 16.
The guide 40 is configured to be connected to a handle 41 provided on the outer side surface in b through a connection shaft 42 and to operate the handle 41 to rotate the guide 40. Handle 41
Are located on the outer surface of the seat back 14. Connecting shaft 4
2 is rotatably penetrated through the arm 16, so that when the guide 40 rotates, the hook 18 rotates accordingly.

As in the second embodiment, the lock bracket 47 has a storage portion 47a in which the elastic body 36 is fitted, and has claws 47c, 47c fitted in the holes 16c, 16c, 16 formed in the arm 16. 47c are formed, and the claws 47c of the lock bracket 47 are inserted into the holes 16c of the arm 16.
To prevent the lock bracket 47 from rotating.

Reference numeral 43 denotes a protector. The protector 43 is mounted on the side frame 11, and the arm 16 is rotatably mounted on the side frame 11 via the protector 43. Therefore, when the arm 16 rotates, the protector 43 is provided between the arm 16 and the side frame 11.
Arm 1 of the side frame
6 can be prevented.

According to the third embodiment, when the handle 41 provided on the outer surface of the seat back 14 is operated, the connecting shaft 42
The guide 40 is rotated via. Therefore, the hooks 18 are rotated by the guides 40 against the urging force of the tension springs 34, and the hooks 18b are retracted from the locking portions 39, so that the seat back 14 can fall forward. Since the handle 41 is located on the outer side surface of the seat back 14, the lock device can be easily unlocked, and the handle 41 does not protrude to the rear of the seat back 14, so that the appearance is improved. Get better.

[0043]

According to the present invention, a cushioning member is provided on a seat cushion provided on a seat cushion, on which a hook provided on a seat back is engaged, to prevent the generation of a tapping sound between the engaging portion and the hook. Is provided, so that a tapping sound does not occur even if the hook piece comes into contact with the locking portion. In the seat back, the elastic body for absorption with backlash,
Since it is provided so as to abut at right angles to the locking portion of the seat cushion, it is possible to sufficiently secure the amount of flexure caused by the locking portion of the elastic body. For this reason, the play between the locking portion and the hook can be absorbed by the elastic body, so that the play between the locking portion and the hook can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of an automobile seat using the device of the present invention.

FIG. 2 is an exploded perspective view of the lock device shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along the line VV of FIG. 2;

FIG. 6 is a side view of a vehicle seat similar to FIG. 1 showing a second embodiment of the device of the present invention.

7 is an exploded perspective view of the lock device shown in FIG.

FIG. 8 is a side view of a vehicle seat similar to FIG. 1 showing a third embodiment of the device of the present invention.

9 is an exploded perspective view of the lock device shown in FIG.

FIG. 10 is a side view of an automobile seat using the conventional device.

[Explanation of symbols]

 12 Seat Cushion 14 Seat Back 18 Hook 19, 39 Engagement 23, 33 Buffer 26, 36 Absorbing elastic body with backlash

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-3-82228 (JP, U) JP-A 64-30033 (JP, U) JP-A 3-27742 (JP, U) JP-A 62- 52454 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) A47C 1/025 B60N 2/22

Claims (1)

(57) [Scope of request for utility model registration] 1. An arm integrally formed with a back frame extends from a lower portion of a seat back along a side surface of a seat cushion, and a base end of the arm is pivotally attached to the seat cushion so as to be rotatable. The hook provided on the seat cushion is locked to a locking portion provided on the seat cushion, and the seat back is locked to the seat cushion.
A cushioning member is provided on the locking portion of the seat cushion to prevent generation of a contact sound between the locking portion and the hook, and the seat back is connected to the pivot portion of the arm and the locking portion. A seatback restraint, wherein an absorptive elastic body is provided which abuts the locking portion at a right angle to the line segment and prevents rattling between the hook and the locking portion. Lock device.