JP2596077Y2 - Armrest device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is based on the position of the armrest.
The present invention relates to an armrest device for a vehicle seat that can adjust an angle to an arbitrary position without a need for an operation lever.

[0002]

2. Description of the Related Art A coil spring is provided so as to straddle an outer peripheral surface of a fixed cylinder provided on a seat frame and a rotating cylinder attached to an armrest frame. Various armrests having an axis lock mechanism in which the free end of the coil-shaped spring is fixed to the armrest frame and the other end is attached to the link mechanism are in close contact with the outer peripheral surfaces of the body and the rotating cylinder. ing. In the case of using these shaft lock devices, it is necessary to increase the inner diameter of the spring when releasing the shaft locked state.

In an armrest mechanism using such a shaft lock device, a link mechanism is arranged on an armrest frame, and one end is connected to a spring terminal and the other end is connected to an operation lever.
By operating this operating lever, the spring end is pulled to expand the inner diameter of the spring (for example, Japanese Utility Model Application Laid-Open Nos. 62-11454, 62-22132, 62-132). 22133).

[0004]

Since the conventional armrest mechanism has the above-described structure, it requires many parts such as operating levers and pins in addition to the lock mechanism, the link, and the armrest frame. Therefore, there is a problem that the structure is complicated, the operation is troublesome, and the price is high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a large diameter portion and a small diameter portion continuous with the large diameter portion, which is fixed to a seat frame. A side cylinder, a rotating cylinder fixedly attached to an armrest frame and rotatably fitted to a small-diameter portion of the fixed cylinder, surrounding the outer peripheral surfaces of the fixed cylinder and the rotating cylinder, A coiled spring having an inner diameter that is in close contact with the outer peripheral surface of the fixed-side cylindrical body and the rotating-side cylindrical body in a free state; one end of the coiled spring is fixed to an armrest frame; and the other end is attached to a link. An armrest device provided with a shaft lock mechanism, a guide groove for engaging a pin provided on an armrest frame at one end of a link, a collar at a central portion, and a locking hole of a coil spring at the other end. Formed rod The collar is further guided from the retracted state of the armrest frame until immediately before entering the lowest use position, and the collar is detached at the lowest use position to lock the shaft lock mechanism. A cam plate provided with a cam surface and a stopper which is brought into contact with the bar-shaped portion when the armrest is retracted to displace the link and to be lock-free.

[0006]

When the armrest is rotated counterclockwise, the coiling spring exerts a tightening force on the coil spring to be in a locked state, and when the armrest is rotated clockwise, a rewinding force is applied. Lock-free state. Therefore, if the armrest is turned counterclockwise and tilted, it is locked at an arbitrary angle, and the armrest can be stopped at an arbitrary position and used steplessly.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a side surface of the armrest A in an assembled state. As is apparent from FIG. 6, the armrest frame 1 is formed in a box shape by bending the periphery 1a, and a mating member (not shown) formed in substantially the same shape is fitted into the armrest frame 1 to form the armrest A. . When not in use, the armrest A is stored in the seat back S in a state as shown in FIG. Is available.
Then, the user enters the use state by tilting the armrest from the storage state.

The armrest frame 1 is provided with a link 3 as shown in FIG. A guide groove 4 for guiding the movement of the link 3 is formed at one end of the link 3, and a coil spring 2 constituting a shaft lock mechanism described later is formed at the other end.
A bar-shaped portion 6 having a spring locking hole 18 for attaching one end of the bar 4 is formed. Further, the link 3 is provided with a rotatable collar 7 at a central portion 8 protruding forward from the guide groove 4 and the rod-shaped portion 6 with respect to the plane of FIG.

A hook-shaped lock portion 9 is provided adjacent to the guide groove 4, and the lock portion 9 can be engaged with a locking portion 10 formed at the tip of the link 3. A pin 5 is provided upright on the armrest frame 1, and is located in the guide groove 4 of the link 3 to restrict the movement of the link 3.

A cam plate 11 having an arc-shaped cam surface 12 and a stopper 13 formed at a position facing the cam surface 12 with a center axis O interposed therebetween is located in the armrest frame 1. The cam plate 11 is fixed to the seat frame 2 side, is provided integrally with the armrest frame 1, and changes its position relative to a member that is displaced with the rotation of the armrest frame 1. 16a and 16b are a pair of arc grooves formed near the center of the cam plate 11, and the arc grooves 16a and 16b
16b, the protruding end 1 provided on the end face of the fixed side cylindrical body 19
7a and 17b are inserted and fixed. For this reason, the positioning of the shaft lock mechanism R is performed.

The above-described shaft lock mechanism has the same structure as that used in a conventional armrest device. That is, FIG.
As shown in the perspective view of FIG. 6, the rectangular tip 22 of the fixed-side cylindrical body 19 is mounted and fixed to the rectangular mounting hole 21 provided in the seat frame 2. The fixed cylinder 1
9 has a large diameter portion 19a and a small diameter portion 19b. A rotation-side cylindrical body 23 fixed to the plate 20 attached to the armrest frame 1 by welding or the like is rotatably fitted into the small diameter portion 19b. Note that the outer diameter surface of the rotation-side cylindrical body 23 has the same outer diameter as the outer diameter of the large-diameter portion 19 a of the fixed-side cylindrical body 19. Thus, the armrest frame 1 can be tilted with respect to the fixed cylindrical body 2.

Further, a coil-shaped spring 24 is mounted so as to straddle the outer peripheral surfaces of the fixed-side cylindrical body 19 and the rotary-side cylindrical body 23. The inner diameter surface of the coil spring 24 is in close contact with the outer peripheral surfaces of the fixed cylindrical body 19 and the rotating cylindrical body 23 in a free state. One end 24a of the coiled spring 24 is attached to a fixed portion 25 provided on the plate 20, and a substantially L-shaped bent portion of the other end 24b is inserted into a spring engagement hole 18 provided on the link 3. It is locked by.
Further, the cam plate 11 is located on the end face 24c side of the coiled spring 24 incorporated as described above. Thus, the shaft lock mechanism R is configured.

In this embodiment, the coil spring 24 is
When the armrest A is rotated counterclockwise, the tightening force is applied to the coiled spring 24 to lock the armrest A, and when the armrest A is rotated clockwise, the unwinding force acts to lock the armrest A. Becomes In other words, if the armrest A is turned counterclockwise, it is locked at an arbitrary angle, and the armrest A can be stopped at an arbitrary position and used steplessly.

When the armrest A is turned clockwise to the storage state shown in FIG.
Is moved by being guided by the cam surface 12, and the end 6a of the rod 6 comes into contact with the stopper 13 of the cam plate 11, so that the link 3 is displaced from the position shown in 3a to the position shown in 3b. Locking part 10 provided at the tip of
Are locked by the hooks of the lock portion 9 to restrict the displacement. At the same time, the position of the terminal 24b of the coil spring 24 is displaced from 24b 'to 24b "to enlarge the inner diameter of the coil spring 24. Therefore, the armrest A is locked against the counterclockwise rotation. It becomes free.

In the above-mentioned retracted state, the locking portion 10 provided at the tip of the link 3 is locked by the hook of the locking portion 9 to restrict the displacement as described above. Since 7 is in contact with the cam surface 12 of the cam plate 11, the terminal 24b of the coiled spring 24 maintains the lock-free state until it reaches the lowest use position shown in FIG.

When the armrest A is tilted to the lowermost use state shown in FIG. 4, the collar 7 provided on the link 3 is disengaged from the cam surface 12 formed on the cam plate 11 from the state shown in FIG. From the position to the position 7b, and the locking portion 10 at the tip of the link 3 is
And the link 3 is displaced to the position shown by the solid line. For this purpose, the terminal 24b of the coil spring 24 is
The position returns to the position 24 'from the position "b", and the lock state is established and the initial state is established.

[0017]

According to the present invention, as described above, one end of a link mechanism is engaged with a guide groove provided on an armrest frame, a collar is provided at a central portion, and a mounting hole for a coil spring is provided at the other end. And a cam plate provided with a circular cam portion and a stopper is attached to a side end of the shaft lock mechanism, and further, a collar can be guided along an arc-shaped cam surface, and The collar is guided from the storage position of the armrest frame to immediately before entering the lowest use position, and the collar can be detached from the circular cam portion at the lowest use position. The armrest can be adjusted steplessly at any position without requiring a special operation lever. Moreover, since no operation lever is required, handling of the operation lever is not required at all, and the operation is simplified. Moreover, since the structure is simple, the number of parts can be reduced, and an inexpensive armrest device can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention in an assembled state.

FIG. 2 is a side view of FIG. 1 with a central portion of the cam plate cut away.

FIG. 3 is a side view of the embodiment shown in FIG. 2 showing a storage state.

FIG. 4 is a side view of the embodiment of FIG. 2 in a lowermost position.

FIG. 5 is a perspective view of a link used in the embodiment.

FIG. 6 is a perspective view of a main part of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Armrest frame 2 Seat frame 3 Link 4 Guide groove 5 Pin 6 Bar-shaped part 7 Collar 11 Cam plate 12 Cam surface 13 Stopper 18 Spring locking hole 19 Fixed side cylindrical body 19a Large diameter part 19b Small diameter part 23 Rotation side cylindrical part 24 Coil Spring 25 Fixed part A Armrest O Center axis R Axis lock mechanism

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed-side cylinder fixed to a seat frame having a large-diameter portion and a small-diameter portion connected to the large-diameter portion, and freely rotatable to a small-diameter portion of the fixed-side cylinder fixed to an armrest frame. The rotating cylindrical body inserted into the fixed cylindrical body and the outer peripheral surface of the rotating cylindrical body are straddled, and the inner diameter in close contact with the outer peripheral surface of the fixed cylindrical body and the rotating cylindrical body in a free state is set. An armrest device comprising: a coiled spring having one end of the coiled spring fixed to an armrest frame; and the other end attached to a link, provided at one end of the link to the armrest frame. A guide groove that engages with the pin is provided, a collar is provided at the center, and a bar-like portion having a locking hole for the coil spring is provided at the other end. The collar guides the collar until immediately before entering the use position of the device, and the collar separates from the collar at the lowest use position to lock the shaft lock mechanism. An armrest device comprising a cam plate provided with a stopper for displacing the lock plate to make the lock free.