JPH06192U - Seat armrest tilt angle adjustment mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a mechanism capable of arbitrarily adjusting the tilt angle of an armrest with a simple configuration. [Structure] A fixed pulley 11 provided concentrically on a support shaft 22,
Movable pulley 1 rotatably supported on armrest 20a
2. A flexible endless belt 13 having teeth on the inner surface that mesh with the teeth of both pulleys 11 and 12 and suspended between the pulleys 11 and 12, and a spring urged during the suspension of the endless belt 13. The pressing means 1 provided so as to press one surface side of the endless belt 13 toward the other surface side so that the tooth portions on the inner surface side of these surfaces mesh with each other.
4. The armrest 2 is provided with a pressing release means 15 for releasing the pressing force of the pressing means 14 on the endless belt 13 by an external operation, and restricting the rotation of the endless belt 13 by its engagement.
The endless belt 1 is regulated by the rotation of 0a and released by meshing.
The rotation of the armrest is allowed by allowing the rotation of 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tilt angle adjusting mechanism for a seat armrest.

[0002]

[Prior art]

 As one type of seat armrest, there is an armrest in which a base end portion is rotatably mounted in a vertical direction on a support shaft provided on one side of a seating portion of the seat, and the armrest projects forward. The tilt angle adjusting mechanism for adjusting the tilt angle in the vertical direction is provided in Japanese Utility Model Laid-Open No. 1-117250 and Japanese Utility Model Laid-Open No. 1-124149. The tilt angle adjustment mechanism has a holding function for holding the armrest in a predetermined tilt angle state with respect to the seat, and disables this holding function so that the armrest can be rotated in either the up or down direction. Has a hold release function.

[0003]

[Problems to be solved by the device]

 As described above, the tilt angle adjusting mechanism has a holding function and a holding releasing function of the armrest, and in the tilt angle adjusting mechanism described in the former publication, the fixed shaft, each nut member, the lock plate, the lock hook, and the operation. In addition, the tilt angle adjusting mechanism described in the latter publication adopts each cam instead of each nut member. For this reason, the tilt angle adjusting mechanism has many constituent members, and its structure is complicated. As a means for solving these problems, the present invention intends to construct an inclination angle adjusting mechanism by adopting a pair of pulleys and an endless belt having teeth on the inner surface that mesh with these pulleys.

An example of a device that employs a pair of pulleys and an endless belt is a seat reclining mechanism as disclosed in Japanese Utility Model Laid-Open No. 61-157743. However, a lock mechanism that regulates the rotation of the endless belt is indispensable in the reclining mechanism, but no specific means for this is shown, and a concrete structure in which the structure of the reclining mechanism is adopted in the armrest is not shown. There is no specific suggestion.

[0005]

[Means for Solving the Problems]

 The present invention is a tilt angle adjusting mechanism for a seat armrest, in which a base end portion is rotatably mounted in a vertical direction on a support shaft provided on one side of a seating portion of a seat and projects forward. A fixed pulley concentrically provided on the shaft, a drive pulley rotatably supported by the armrest, and a tooth portion meshing with the tooth portions of both pulleys are provided on the inner surface side and are suspended between these pulleys. A flexible endless belt and a spring provided while the endless belt is being suspended are urged by a spring to press one surface side of the endless belt toward the other surface side and mesh the teeth on the inner surface side of these surfaces with each other. The present invention is characterized by comprising a pressing means and a pressing releasing means for releasing the pressing force applied to the endless belt by the pressing means by an external operation.

[0006]

[Operation and effect of the device]

 In the armrest tilt angle adjusting mechanism having such a structure, in the normal state, both sides of the endless belt are meshed with each other at the intermediate portions of both pulleys by the action of the pressing means, and the rotation of the endless belt is restricted. Therefore, since the drive pulley does not rotate, the armrest does not rotate even if an attempt is made 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 release means releases the pressing of the endless belt, the meshing at the intermediate part of the endless belt is released and the armrest is rotatable, and the armrest is unlocked against the seat and either in the vertical direction. Can also be rotated. Therefore, the armrest can be rotated to incline at an arbitrary angle, and if the operation of the pressing release means is released thereafter, the endless belt is meshed at the intermediate portion by the pressing action of the pressing means to regulate the rotation. Then, the armrest is held on the seat with the tilt angle adjusted.

In the tilt angle adjusting mechanism, however, the armrest is held and released from the seat by engaging and releasing the mesh between both sides of the endless belt. Compared to this, the number of components is small and the configuration is simple.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are vertical side views of a tilt angle adjusting mechanism according to the present invention, and FIG. An exploded perspective view is shown. The adjusting mechanism 10 is arranged inside the armrest 20a shown in FIG. 4, and the armrest 20a is attached to one side of a seatback 20b forming a seat so as to be vertically rotatable. The adjusting mechanism 10 mainly includes a fixed pulley 11, a movable pulley 12, an endless belt 13, a pressing bracket 14, an operating lever 15, and tension springs 16a and 16b. The fixed pulley 11 and the movable pulley 12 are provided with a large number of tooth portions 11a, 12a on their entire outer circumferences.

The fixed pulley 11 is fixed to a support shaft 22 that is provided on a back frame 21 that constitutes the seatback 20b and projects outward, and is provided at the base end of a frame 23 that constitutes the armrest 20a. The support bush 24 fitted in the fitting hole 23b of the frame 23 is fixed to the end surface of the fixed pulley 11 by a nut. In this state, the fixed pulley 11 is positioned inside the frame 23, and the frame 23 is rotatably supported on the tubular portion 22a of the support shaft 22 and the tubular portion 24a of the support bush 24, and is supported by the flange portions 22b and 24b. It is locked out. The movable pulley 12 is rotatably fitted on a shaft 23c provided at the tip of the frame 23, and is positioned in the frame 23 on the same straight line as the fixed pulley 11.

The endless belt 13 is a flexible one made by reinforcing rubber, and has a large number of tooth portions 13a meshing with the tooth portions 11a, 12a of the pulleys 11, 12 on the entire inner surface thereof. It is suspended between the pulleys 11 and 12 and extends in the front-rear direction inside the frame 23. A belt guide 23d is provided in the middle of the pulleys 11 and 12 at the bottom of the frame 23, and a pressing bracket 14 is provided so as to face the belt guide 23d. The pressing bracket 14 is attached to the side of the frame 23 at the rear of the arm portions 14b provided on both the left and right sides of the plate-shaped main body 14a so as to be vertically rotatable via a shaft 23e. Further, the pressing bracket 14 is urged downward by a tension spring 16a at its front part, and an arcuate elongated hole 15b provided at the rear part of the lever body 15a of the operating lever 15 via an engaging pin 14c. The engaging pin 14c is passed through and is connected to the operation lever 15. In this state, the pressing bracket 14 has its plate-shaped main body 14a abutted on the upper surface of the endless belt 13 so as to sandwich both surfaces of the endless belt 13 with the belt guides 23d. Tooth portions 13a are meshed with each other. As a result, the rotation of the endless belt 13 is restricted.

The operating lever 15 includes a long lever body 15a, an arcuate elongated hole 15b provided at the rear portion of the lever body 15a, and a knob 15c provided at the front portion of the lever body 15a. The tension spring 16b is inserted between the lever body 15a and the frame 23 through the opening 23f provided in the frame 23. In this state, the operation lever 15 is biased forward by the action of the tension spring 16b so that the knob 15c is projected forward from the opening 23f of the frame 23, and the engaging pin 14c provided on the pressing bracket 14 is circular. It is located at the rear of the arc-shaped elongated hole 15b.

In the adjusting mechanism 10 configured in this way, when the operating lever 15 is not operated, the operating lever 15 is located in the front as shown in FIG. 1, and the pressing bracket 14 moves the intermediate portion of the endless belt 13 downward. By pressing, the tooth portions 13a on both inner surfaces of the endless belt 13 are meshed with each other. As a result, the endless belt 13 is restricted from rotating, and the armrest 20a rotatably supported by the support shaft 22 is restricted from rotating in the vertical direction. Therefore, the armrest 20a is held in a state of protruding 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 operation lever 15 is pushed. As a result, the lever main body 15a moves rearward against the tension spring 16b to move the engagement pin 14c to the front of the arcuate elongated hole 15b and pull up the front portion of the pressing bracket 14. As a result, the plate-shaped main body 14a of the pressing bracket 14 reduces the pressing force applied to the endless belt 13 as shown in FIG. 2, and the meshing between the inner surfaces of the endless belt 13 is released to rotate the endless belt 13. Remove restrictions. Therefore, when the front portion of the armrest 20a is rotated in the vertical direction, the endless belt 13 rotates on both pulleys 11 and 12 in the direction of arrow A or B, and the armrest 20a rotates in the vertical direction. Can be adjusted to any tilt angle. If the pushing motion of the knob 15c of the operating lever 15 is released after the adjustment of the tilt angle, the operating lever 15 moves forward by the action of the tension spring 16b and returns to its original position, and the engaging pin 14c has an arc shape. It moves to the rear part of the long hole 15b.

Therefore, the pressing bracket 14 is lowered by the action of the tension spring 16a and returns to its original position, and strongly presses the endless belt 13 to mesh the tooth portion 13a between both inner surfaces thereof. The rotation of the endless belt 13 is regulated by the meshing of the tooth portions 13a between the inner surfaces of the endless belt 13, and the armrest 20a is restrained from rotating in the vertical direction and is held at the adjusted inclination angle state.

As described above, in the adjusting mechanism 10, the armrest 20a is held and released from the seat back 20b by engaging and releasing the tooth portions 13a between the inner surfaces of the endless belt 13. It does not require a special locking mechanism and has fewer components than the conventional tilt angle adjusting mechanism described above, and the structure is simple.

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

10 ... Inclination angle adjusting mechanism, 11 ... Fixed pulley, 12 ... Movable pulley, 13 ... Endless belt, 14 ... Press bracket, 1
4c ... Engaging pin, 15 ... Operating 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)

[Scope of utility model registration request] 1. A tilt angle adjusting mechanism for a seat armrest, the base end portion of which is rotatably mounted in a vertical direction on a support shaft provided on one side of a seating portion of the seat and which projects forward. A fixed pulley concentrically provided on the shaft, a drive pulley rotatably supported by the armrest, and a tooth portion meshing with the tooth portions of these pulleys on the inner surface side, and a flexible member suspended between these pulleys. Endless belt, and a pressing means that is provided while being spring-biased during suspension of the endless belt and presses one surface side of the endless belt to the other surface side to mesh the tooth portions on the inner surface side of these surfaces with each other. And a pressing release means for releasing the pressing force applied to the endless belt by the pressing means by an external operation.