JP2574854Y2 - Seat armrest tilt angle adjustment mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for adjusting a tilt angle of a seat armrest.

[0002]

2. Description of the Related Art As one type of seat armrest,
A support shaft provided on one side of a seating portion of the seat has an armrest which is assembled so as to be rotatable in a vertical direction at a base end thereof and protrudes forward. In the armrest, an inclination angle of the armrest in a vertical direction is adjusted. A tilt angle adjusting mechanism is provided, and the tilt angle adjusting mechanism is disclosed in Japanese Utility Model Laid-Open No. 1-1117250 and Japanese Utility Model Laid-Open No. 1-124149. The tilt angle adjustment mechanism has a holding function of holding the armrest at a predetermined tilt angle with respect to the seat, and cancels the holding function to release the armrest so that the armrest can be rotated in any direction. Has a function.

[0003]

As described above, the tilt angle adjusting mechanism has the function of holding and releasing the armrest, and the tilt angle adjusting mechanism described in the former publication has a fixed shaft and each nut. It is configured to include a member, a lock plate, a lock hook, an operation mechanism, and the like. The tilt angle adjustment mechanism described in the latter publication has a configuration in which each cam is used instead of each nut member. . For this reason, the inclination angle adjusting mechanism has many components and has a problem that the structure is complicated. In order to solve these problems, the present invention employs a pair of pulleys and an endless belt having teeth on its inner surface meshing with the respective pulleys to constitute a tilt angle adjusting mechanism.

[0004] As a device employing a pair of pulleys and an endless belt, there is a seat reclining mechanism as disclosed in Japanese Utility Model Laid-Open Publication No. 61-157743.
However, in the reclining mechanism, a lock mechanism for restricting the rotation of the endless belt is indispensable, but no specific means is shown, and specific suggestions for adopting the configuration of the reclining mechanism in the armrest are not given. not exist.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a seat armrest which is mounted on a support shaft provided on one side of a seating portion of a seat so as to be rotatable up and down in a vertical direction and projects forward. An angle adjusting mechanism, a fixed pulley provided concentrically on the support shaft, a drive pulley rotatably supported on the armrest, and a tooth portion meshing with the tooth portions of these pulleys on the inner surface side. A flexible endless belt suspended between the pulleys, and a spring is provided during the suspension of the endless belt, and one side of the endless belt is pressed toward the other side to press the inner side of each of these surfaces. It is characterized by comprising a pressing means for meshing the teeth with each other, and a pressing release means for releasing the pressing force on the endless belt by the pressing means by an external operation.

[0006]

In the armrest tilt angle adjusting mechanism having the above construction, both ends of the endless belt are meshed with each other at an intermediate portion of both pulleys by the action of the pressing means in a normal state, and the endless belt rotates. Is regulated.
For this reason, since the drive pulley does not rotate, it does not rotate even if it tries to rotate the armrest in the vertical direction, and the armrest is held in a locked state with respect to the seat. In this state, when the pressing means releases the pressing of the pressing means against the endless belt, the engagement at the intermediate portion of the endless belt is released and the armrest becomes rotatable. Can also be turned. For this reason, the armrest can be rotated to incline at an arbitrary angle, and then, when the operation of the pressing release means is released, the endless belt meshes at the intermediate portion by the pressing action of the pressing means to restrict the rotation. The armrest is held on the seat in the adjusted tilt angle state.

However, in the tilt angle adjusting mechanism, since the holding and releasing of the armrest with respect to the sheet are performed by meshing and releasing the endless belt between both surfaces, it is compared with the above-described conventional tilt angle adjusting mechanism. Thus, the number of constituent members is small, and the configuration is simple.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are longitudinal side views of an inclination adjusting mechanism according to the present invention, and FIG. An exploded perspective view of the adjustment mechanism is shown. The adjusting mechanism 10 is shown in FIG.
The armrest 20a is mounted on one side of a seatback 20b constituting a seat so as to be rotatable in a vertical direction. The adjusting mechanism 10 includes a fixed pulley 11 and a movable pulley 1
2. The endless belt 13, the pressing bracket 14, the operating lever 15, and the tension springs 16a and 16b are main components. Fixed pulley 11 and movable pulley 1
2 has a large number of teeth 11a, 12a on the entire outer periphery thereof.

The fixed pulley 11 is provided on a back frame 21 constituting a seat back 20b and is fixed to a support shaft 22 projecting outward, and is fitted at a base end of a frame 23 constituting an arm rest 20a. The supporting bush 24 fitted in the fitting hole 23b of the frame 23 is provided in the end face of the fixed pulley 11 in a state fitted in the hole 23a.
Are fixed by nuts. In this state, the fixed pulley 11 is positioned inside the frame 23, and the frame 23 is connected to the cylindrical portion 22a of the support shaft 22 and the cylindrical portion 24a of the support bush 24.
, And are rotatably supported on the respective flange portions 22b, 24.
b. The movable pulley 12 is rotatably fitted on a shaft 23 c provided at the tip of the frame 23, and is located on the same straight line as the fixed pulley 11 in the frame 23.

The endless belt 13 is a flexible material reinforced with rubber, and has a large number of teeth 13a meshing with the teeth 11a, 12a of the pulleys 11, 12 on the entire inner surface thereof. Frame 23 suspended between pulleys 11 and 12
Extends in the front-rear direction. A belt guide 23d is provided at the bottom of the frame 23 at an intermediate portion between the pulleys 11 and 12, and a pressing bracket 14 is provided to face the belt guide 23d. Press bracket 14
Are the arm portions 1 provided on the left and right sides of the plate-shaped main body 14a.
At the rear of 4b, it is attached to the side of the frame 23 via a shaft 23e so as to be rotatable in the vertical direction. Also,
The pressing bracket 14 is urged downward by a tension spring 16a at its front part, and
The engagement pin 14c is inserted through an arc-shaped long hole 15b provided at a rear portion of the lever main body 15a of the operation lever 15 through the operation lever 15, and is connected to the operation lever 15. In this state, the pressing bracket 14 causes the plate-shaped main body 14a to abut on the upper surface of the endless belt 13 as shown in FIG. 1 to hold both surfaces of the endless belt 13 with the belt guide 23d,
The teeth 13a on both inner surfaces of the endless belt 13 are meshed with each other. Thereby, the rotation of the endless belt 13 is restricted.

The operation lever 15 is a long lever body 15a.
And an arc-shaped long hole 15b provided at the rear of the lever body 15a.
And a knob 15c provided at a front portion of the lever body 15a. The knob 15c is inserted into the frame 23 through an opening 23f provided at a front portion of the frame 23.
A tension spring 16b is hung between the frame 23 and the frame 23. In this state, the operation lever 15 is urged forward by the action of the tension spring 16b to cause the knob 15c to protrude forward from the opening 23f of the frame 23, and to engage the engaging pin 14c provided on the pressing bracket 14 with an arc. It is located at the rear of the slot 15b.

In the adjusting mechanism 10 constructed as described above, when the operation lever 15 is not operated, the operation lever 15 is located at the front as shown in FIG. 1, and the pressing bracket 14 presses the intermediate portion of the endless belt 13 downward. Endless belt 13
Are meshed with each other. Accordingly, the rotation of the endless belt 13 is restricted, and the vertical rotation of the armrest 20a rotatably supported by the support shaft 22 is restricted. Therefore, the armrest 20
a is held so as to protrude forward at a predetermined inclination angle.

On the other hand, when it is desired to adjust the tilt angle of the armrest 20a, the knob 15c of the operating lever 15 is pushed. As a result, the lever body 15a moves rearward against the tension spring 16b, and the engagement pin 14c is moved.
Is moved forward of the arc-shaped long hole 15b, and the front portion of the pressing bracket 14 is pulled up. As a result, the plate-shaped main body 14a of the pressing bracket 14 reduces the pressing force against the endless belt 13 as shown in FIG.
The engagement between both inner surfaces of the endless belt 3 is released to release the rotation regulation of the endless belt 13. Therefore, when the front portion of the armrest 20a is turned in the vertical direction, the endless belt 13 is turned on the pulleys 11 and 12 in the direction of arrow A or B, and the armrest 20a is turned in the vertical direction. Can be adjusted to an arbitrary inclination angle. When the pushing of the operating lever 15 against the knob 15c is released after the adjustment of the inclination angle, the operating lever 15 moves forward by the action of the tension spring 16b and returns to the original position, and the engaging pin 14c is turned into the arc-shaped long hole. Move to the rear of 15b.

For this reason, the pressing bracket 14 is lowered by the action of the tension spring 16a and returns to the original position, and strongly presses the endless belt 13 to mesh the teeth 13a between both inner surfaces thereof. The rotation of the endless belt 13 is regulated by the meshing of the teeth 13a between the inner surfaces thereof, and the endless belt 13 is held in the adjusted tilt angle state by regulating the vertical rotation of the armrest 20a.

As described above, in the adjusting mechanism 10, the holding and releasing of the armrest 20 a with respect to the seat back 20 b are performed by engaging and releasing the teeth 13 a between both inner surfaces of the endless belt 13. No special lock mechanism is required, and the number of components is smaller than that of the above-described conventional tilt angle adjusting mechanism, and the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a tilt angle adjusting mechanism according to an embodiment of the present invention when an operation lever is not operated.

FIG. 2 is a vertical cross-sectional view of the adjustment mechanism when an operation lever is operated.

FIG. 3 is an exploded perspective view of the adjustment mechanism.

FIG. 4 is a perspective view of a seat provided with an armrest employing the adjustment mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Inclination angle adjustment mechanism, 11 ... Fixed pulley, 12 ... Movable pulley, 13 ... Endless belt, 14 ... Press bracket, 1
4c: engagement pin, 15: operation lever, 15b: arc-shaped long hole, 16a, 16b: tension spring, 20a:
Armrest, 20b: seat back, 21: back frame, 22: support shaft, 23: frame, 23d: belt guide.

Claims (1)

(57) [Scope of request for utility model registration] An inclination adjusting mechanism for a seat armrest which is mounted on a support shaft provided on one side of a seating portion of a seat so as to be rotatable in a vertical direction and projects forward. A fixed pulley provided concentrically on a shaft, a drive pulley rotatably supported by the armrest, and a flexible member having teeth on its inner surface to mesh with teeth of both pulleys and suspended between the two pulleys. Pressing means which presses one surface side of the endless belt to the other surface side and engages the teeth of the inner surface side of each surface with each other. And a pressing release means for releasing the pressing force of the pressing means against the endless belt by an external operation.