JPH04361708A - Arm rest angle adjusting device - Google Patents

Abstract

PURPOSE:To ensure locking of angle adjustment for an arm rest and reduce the operation load. CONSTITUTION:A sector gear 8 is secured to a mounting shaft 7 at the side of a seat back 3, and an arm rest 4 is installed also on this mounting shaft 7 rotatably. The arm rest 4 is fitted with a lock gear 14 which moves revolving fore and aft so as to mesh with the sector gear 8 with possibility of disengagement, a spring 21 energizing this lock gear 14 so as to mesh with the sector gear 8, and an operation knob 25 slidable to the left and right to serve revolving of the lock gear 14. Between the knob 25 and lock gear 14, a cam mechanism 17 is installed which revolves the lock gear 14 by turning the left-right motion of the knob 25 into the fore-and-aft motions.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armrest angle adjustment device.

0002

[Prior Art] Conventionally known Japanese Utility Model Publication No. 12772/1985 discloses a mounting shaft provided on the side of a backrest seat so as to protrude laterally, and a mounting shaft fixed to the mounting shaft and arranged around the axis of the shaft. A sector gear forming a gear, an armrest frame of an armrest rotatably attached to the mounting shaft, a lock gear provided on the armrest frame and connected to and detached from the sector gear, and the lock gear attached to engage with the sector gear. In the device, the lock gear is provided so as to rotate in a front-back direction, and the operating knob is provided on the tip side of an armrest so as to be movable back and forth, and the operating knob A structure is described in which a rod is provided between the lock gear and the lock gear to rotate the lock gear by the back and forth movement of the operating knob.

0003

[Problems to be Solved by the Invention] The above-mentioned known device has a structure in which a rod is provided between the operating knob and the lock gear to rotate the lock gear by the back and forth movement of the operating knob, so the operating knob does not engage the lock gear with the sector gear. Since the lock gear is rotated against the elasticity of the spring that biases the lock gear to fit together, there is a problem that the operation knob is difficult to operate. In other words, since the operating load of the operating knob is equal to the spring elasticity, reducing the operating load of the operating knob will reduce the force with which the lock gear meshes with the sector gear, making the locking uncertain. However, reducing the operating load on the operating knob and ensuring reliable engagement of the lock gear are not compatible, and the operating load on the operating knob inevitably becomes heavy.

0004

OBJECTS OF THE INVENTION The present invention provides an armrest angle adjustment device that provides reliable locking and a light operating load.

[0005]

[Means for Solving the Problems] Accordingly, the present invention includes a mounting shaft 7 provided on the side of the backrest seat 3 so as to project laterally, and a mounting shaft 7 fixed to the mounting shaft 7 and arranged around the axis of the shaft 7. A sector gear 8 forming a gear, an armrest frame 9 of the armrest 4 rotatably attached to the mounting shaft 7, a lock gear 14 provided on the armrest frame 9 and connected to and detached from the sector gear 8, and the lock gear 14 The device is composed of a spring 21 that urges the sector gear 8 to engage and an operation knob 25 that rotates the lock gear 14. The lock gear 14 is provided to rotate in the front-rear direction, and the operation knob 25 is The armrest frame 9 is provided slidably in the left and right directions on the front side, and is provided between the operation knob 25 and the lock gear 14 to convert the left and right movement of the operation knob 25 into a front and back movement to rotate the lock gear 14. This is an armrest angle adjustment device equipped with a cam mechanism 17 for moving the armrest.

[0006]

[Example] Examples of the present invention will be explained with reference to the drawings.
2 is a vehicle seat; 2 is a seat seat of the vehicle seat 1; 3 is a backrest seat attached to the rear of the seat 2 so as to be rotatable in the front-rear direction; is provided with an armrest 4 that projects forward.

Reference numeral 5 denotes a skeleton frame of the backrest seat 3, and plate-shaped brackets 6 are fixed to the sides of the skeleton frame 5 in the front-rear direction. The base (inner end) of a left-right mounting shaft 7 is fixed to the bracket 6, and the shaft 7 is fixed to the mounting shaft 7.
A sector gear 8 having a gear formed around the axis is fixed.

Reference numeral 9 denotes an armrest frame of the armrest 4. A shaft tube 10 in the left and right direction is fixed to the base of the armrest frame 9, and the shaft tube 10 is inserted into the mounting shaft 7, and the shaft tube 10 is inserted outwardly from the shaft tube 10. The armrest frame 9 is attached to the mounting shaft 7 by screwing the bolt 11 into the protruding mounting shaft 7.

A notch 12 is formed in the inner surface of the base of the armrest frame 9, and the sector gear 8 is positioned within the notch 12. An opening 13 is formed in the armrest frame 9 facing the notch 12 , and a lock gear 14 that protrudes outward from the opening 13 and engages with the sector gear 8 is located in the upper and lower middle of the armrest frame 9 inside the opening 13 . The parts are fixed by a shaft 15 in the left and right direction. A lock pawl 16 is formed on the lower rear surface of the lock gear 14,
The lock claw 16 protrudes from the opening 13 into the notch 12 and engages and locks the sector gear 8, thereby fixing the armrest 4 in position with respect to the backrest seat 3.

The rear end of a rod 18 is pivoted to the upper part of the lock gear 14, and the front end of the rod 18 is pivoted to the tip of a rotating arm 19. The rotating arm 19 is rotatably attached to the armrest frame 9 by a vertical shaft 20. A spring 21 biases the lock gear 14 in the direction of meshing with the sector gear 8.

[0011] An operation knob 25 for operating the lock gear 14 is provided on the front inner surface of the armrest frame 9.
will be established. The operation knob 25 is slidably fitted into a left-right shaft cylinder 26 provided on the armrest frame 9. The operating knob 25 is formed with a cylindrical portion 27 that protrudes inward, and a cam portion 28 is formed inside the cylindrical portion 27. The cam portion 28 is brought into contact with the front surface 32 of the rotary arm 19, and
The front surface 32 of 9 and the cam portion 28 constitute the cam mechanism 17.

The cam mechanism 17 operates when the operation knob 25 is pressed.
The cam portion 28 pushes the front surface 32 of the rotating arm 19 to rotate the vertical shaft 2.
0, and the rod 18 is rotated by the rotating arm 19.
to rotate the lock gear 14 and detach the lock pawl 16 from the sector gear 8, converting the left and right movement of the operating knob 25 into a backward movement of the rod 18 by the cam part 28 and the rotation arm 19, The operating load on the operating knob 25 is reduced.

That is, the front surface 32 of the rotary arm 19 is formed into an arc-shaped cam surface, and the outer periphery of the cam portion 28 is formed into a wedge shape that becomes narrower toward the inside. It is configured so that the tangent line L when they make contact is nearly parallel to the moving direction of the cam part 28, and the cam part 28 pushes the rotating arm 19 like a wedge, thereby reducing the operating load on the operating knob 25 ( Figure 5).

The operation knob 25 is integrally formed with the shaft cylinder portion 27 and the cam portion 28 from synthetic resin, and an insertion hole 29 is formed at the center of the operation knob 25 in the sliding direction. The base of the horizontal mounting shaft 30 is fixed to a protrusion 33 fixed in the armrest frame 9. A spring 31 is provided on the outer periphery of the horizontal mounting shaft 30 to always bias the operating knob 25 to its original position. Further, the diameter of the cam portion 28 on the operating knob 25 side is the same as that of the shaft cylinder 26.
The operating knob 25 is formed to have a larger diameter to prevent the operating knob 25 from coming off.

[0015]

[Effect] Next, the effect will be described. The present invention has the above-mentioned configuration, and the lock pawl 16 of the lock gear 14 meshes with the sector gear 8 fixed to the mounting shaft 7, and this mesh is biased by the spring 21 to hold the armrest 4 at a desired angle. Next, when the rod 18 moves backward, the rod 18 engages the lock gear 14.
Since the upper part of the lock gear 14 is pushed backward, the lock claw 1 of the lock gear 14
6 rotates counterclockwise and separates from sector gear 8 (Fig. 3
), the armrest 4 is free to rotate about the mounting shaft 7, and the inclination angle of the armrest 4 is adjusted.

In this case, since a cam mechanism 17 is provided between the operating knob 25 and the lock gear 14 for converting movement in the left and right direction into movement in the front and back directions, the operating knob 25 is provided on the inner surface of the front side of the armrest 4. be able to. Therefore, when you sit on the vehicle seat 1, not only do you immediately see the operation knob 25, but you can also press your thumb against the operation knob 25 by simply grasping the front end of the armrest 4, allowing you to safely and reliably operate the operation knob. 25 can be operated.

The specific operation of the cam mechanism 17 is that when the operating knob 25 is pushed, the operating knob 25 is guided inside the shaft cylinder 26 by the mounting horizontal shaft 30 and moves inward against the elasticity of the spring 31. Cam part 2 that slides and is provided inside the operating knob 25
8 moves inward together with the operating knob 25.

Since the front surface 32 of the rotating arm 19, which is arc-shaped when viewed from above, is in contact with the cam portion 28, the cam portion 28 is in contact with the cam portion 28.
8 moves inward, the cam part 28 pushes the rotating arm 19 rearward, converting the left-right movement of the operating knob 25 into a back-and-forth movement, and the rotating arm 19 rotates rearward around the vertical axis 20. When the rotation arm 19 rotates, the rod 18 moves backward and pushes the upper part of the lock gear 14 backward, and the lock gear 14 rotates around the shaft 15 so that the lock pawl 16 of the lock gear 14 is moved from the sector gear 8. break away.

When the lock claw 16 of the lock gear 14 is disengaged from the sector gear 8, the armrest frame 9 becomes free with respect to the mounting shaft 7, so the inclination angle can be adjusted by moving the tip of the armrest 4 up and down to a desired position.

In this case, the relationship between the front surface 32 of the rotating arm 19 and the cam portion 28 is such that the tangent L when the cam portion 28 abuts the front surface 32 of the rotating arm 19 is the direction of movement of the cam portion 28. Since they are configured to be nearly parallel, when the operating knob 25 is pushed, the cam portion 28 acts like a wedge on the rotating arm 19, causing the rotating arm 19 to resist the elasticity of the spring 21. Since the operating knob 25 is rotated by hand, the operating load on the operating knob 25 is reduced.

[0021] After adjusting the inclination angle, the operating knob 25
When you release your finger, the operating knob 25 moves outward within the shaft cylinder 26 due to the elasticity of the spring 31, and the side surface of the cam portion 28 moves outward within the shaft cylinder 26.
The operating knob 25 returns to its original position. When the cam portion 28 moves outward, the pressure on the rotating arm 19 by the cam portion 28 is released, so the lock gear 14 rotates due to the elasticity of the spring 21, and the lock pawl 16 rotates toward the sector gear 8 to engage. Then, the armrest 4 is fixed, and the rotation of the lock gear 14 causes the rod 18 to move forward and return the rotation arm 19 to its original position.

Note that the armrest frame 9 is attached to the mounting shaft 7.
Since the lock gear 14 is detached from the sector gear 8, the armrest frame 9 is rotated and the armrest 4 is attached to the backrest seat 3.
It can also be stored so that it overlaps the side of the body.

[0023]

[Effect] The present invention includes a mounting shaft 7 provided on the side of the back seat 3 so as to project laterally, and a sector gear 8 fixed to the mounting shaft 7 and forming a gear around the axis of the shaft 7. , an armrest frame 9 of the armrest 4 rotatably attached to the mounting shaft 7; a lock gear 14 provided on the armrest frame 9 to be connected to and detached from the sector gear 8; and a lock gear 14 configured to engage the sector gear 8. The lock gear 14 is provided to rotate in the front-rear direction, and the operation knob 25 is provided on the front side of the armrest frame 9. A cam mechanism 17 is provided to be slidable in the left-right direction, and a cam mechanism 17 is provided between the operation knob 25 and the lock gear 14 to convert the left-right movement of the operation knob 25 into a front-back movement and rotate the lock gear 14. Since this is an armrest angle adjustment device, a cam mechanism 17 is provided between the operating knob 25 and the lock gear 14 to convert the horizontal movement of the operating knob 25 into a longitudinal movement and rotate the lock gear 14. Because of this provision, the operating load that pushes the operating knob 25 due to the cam action of the cam mechanism 17 can be reduced without reducing the elasticity of the spring 21 that biases the engagement between the lock gear 14 and the sector gear 8, and a reliable lock can be achieved. This has the effect of achieving both of this and the reduction of the operating load.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vehicle seat.

[Fig. 2] A perspective view of the assembled state.

[Figure 3] Cross-sectional plan view of main parts.

[Fig. 4] A perspective view of the main parts.

FIG. 5 is an explanatory diagram of the operating state.

[Explanation of symbols]

1...vehicle seat, 2...seat sheet, 3...backrest sheet,
4... Armrest, 5... Skeletal frame, 6... Bracket, 7... Mounting shaft, 8... Sector gear, 9... Frame, 10...
Shaft cylinder, 11... Bolt, 12... Notch, 13... Opening, 1
4...lock gear, 15...shaft, 16...lock claw, 17...cam mechanism, 18...rod, 19...rotating arm, 20...vertical shaft, 21...spring, 25...operation knob, 26...shaft cylinder, 27...shaft Cylinder part, 28...Cam part, 29...Insertion hole, 30...Mounting horizontal axis,
31...Spring, 32...Front surface, 33...Protrusion piece.

Claims (1)

[Claims] Claim 1: A mounting shaft 7 provided on the side of the backrest seat 3 so as to protrude laterally, and a mounting shaft 7 fixed to the mounting shaft 7.
a sector gear 8 formed with a gear around an axis; an armrest frame 9 of the armrest 4 rotatably attached to the mounting shaft 7; a lock gear 14 provided on the armrest frame 9 and connected to and detached from the sector gear 8; A spring 21 that urges the lock gear 14 to engage with the sector gear 8, and an operation knob 2 that rotates the lock gear 14.
5, the lock gear 14 is provided to rotate in the front-rear direction, the operation knob 25 is provided on the front side of the armrest frame 9 so as to be slidable in the left-right direction,
The armrest angle adjusting device is provided with a cam mechanism 17 between the operation knob 25 and the lock gear 14, which converts the left-right movement of the operation knob 25 into a front-back movement and rotates the lock gear 14.