JPS6080933A - Device for adjusting longitudinal position of head rest - Google Patents

Abstract

PURPOSE:To enable a rider to adjust the longitudinal position of a head rest easily with one hand and smoothly without moving the head rest stepwise, by arranging the head rest such that a shift member is shifted with rewpect to a guide member through rack and pinion gears by operating a control member. CONSTITUTION:A guide member 23 for guiding a seat in front and back directions is fixed on the upper end of a stay which can be inserted into or drawn out from the seat back of the seat. The guide member 23 is provided with U- shaped guide sections 24 on its both sides, and with a rack gear 29 at the central portion thereof. A shifting member 25 having sliders 26 to be engaged with the guide sections 24 is provided on the guide member 23, and a head rest body is attached to the shifting member 25. A fitting recess 31 is formed at the center of the lower face of the shifting member 25, while an approximately cylindrical housing 33 is integrally formed over the recess so as to extend in the transverse direction of the shifting member 25. A pinion gear 36 to be engaged with the rack gear 29 is housed in the housing 33 so as to be rotated by the control member 43.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application This invention relates to a headrest longitudinal adjustment device attached to the upper part of a seat pack.

(b) Prior Art As a conventional headrest longitudinal adjustment device, there is one shown in FIGS. 1 and 2 of Japanese Utility Model Application Laid-Open No. 55-32176, for example. That is, 1.1 is a stay that projects from the top of the seat pack. A guide member 4 having mouth-shaped guide portions 3.3 on both sides is fixed to this stay 1.1. This guide member 4 includes the guide portion 3.3.
A movable member 6 having a fitting portion 5.5 that fits with the inner cover 7 is provided so as to be slidable in the front and rear directions, and an inner cover 7 is fixed to the movable member 6. Further, a spring 8 is stretched between the guide member 4 and the moving member 6, and the guide member 4
In contrast, the moving member 6 is always urged forward. Furthermore, a lock plate 9 is installed on the top of the moving member 6, and is slidable in a direction perpendicular to the moving direction.
An operating knob 10 is provided at one end of this. Two lock claws 11.11 are protruded from the lock plate 9, and the guide member 4 faces the lock claws 11.11.
A plurality of lock holes 12 are provided in the guide portions 3, 3 in the seat front and rear directions. The lock plate 9 is biased by a spring 13 in a direction in which the lock pawls 11.11 engage with the lock holes 12. In addition,
14 is the urethane foam, and 15 is the epidermis.

When moving the headrest forward, when the operating knob 10 is pushed in against the restoring force of the spring 13, the lock plate 1-9 slides and the lock claw 11.1
1 comes off from the lock hole 12 and the lock is released. Therefore, since the moving member 6 moves forward due to the restoring force of the spring 8.8, when the operating knob 10 is released at the desired position, [
The single claw 11.degree. 11 engages with the lock hole 12, and the movable member 6 is locked to the guide member 4, allowing the headrest to be fixed at a desired position.

However, in such a conventional Heradrest back and forth adjustment device, the locking claw 11 .
11 and the lock hole 12, it will move forward due to the restoring force of the spring 8.
In order to lock it in a desired position, it is necessary to operate the operating knob 10 while holding the helmet rest with the hand or head, making it extremely difficult and complicated to adjust with only one hand.

Further, since the locking claw 11 is selectively engaged with the locking hole 12, there is a problem that the adjustment must be made in stages.

(c) Purpose of the Invention This invention was made to solve the above-mentioned problems, and provides a headrest longitudinal adjustment device that facilitates adjustment with only one hand, allows stepless adjustment, and reduces operational errors. provide.

(d) Structure of the Invention In order to achieve the above object, the present invention includes a guide member in the front and rear direction of the seat provided at the upper part of the seat back, and a guide member fixed to the headrest side and movably guided in the front and rear direction of the seat. 3-adjustment of the headrest fore and aft, the headrest having a movable member fixed to either the guide member or the movable member in the seat longitudinal direction, and an operating member having a pinion gear that is supported depending on the user and meshes with the rack gear. The device has a concave portion and a convex portion that are formed on the rack gear side and the pinion gear side and are fitted so as to be relatively movable in the front and rear directions of the seat to integrate the meshing of the rack gear and the pinion gear.

(E) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

First, to explain the structure, 21.21 is a stay that is removably supported on the seat back, and this stay 21.
．． 21 is provided with a headrest 22.

A guide member 23 in the seat longitudinal direction is fixed to the upper end of the stay 21, 21, and a guide member 23 in the seat longitudinal direction is bent inwardly into a U-shape at both ends of the guide member 23 in the seat width direction. 24.24 are provided facing each other. Reference numeral 25 denotes a moving member fixed to the headrest 22 side and guided by the guide member 23 so as to be movable in the seat longitudinal direction.The moving member 25 has guide portions 24 and 24 at both ends extending in the seat width direction. A sliding portion 4-26.26 is provided to be inserted. In addition, the guide member 23
A plurality of carbide holes 27 are drilled in the intermediate portion of the sheet along the width direction of the sheet, and these long holes 27...
A rack gear side 29 in the seat front-rear direction is attached to the upper surface of the guide member 23 by a plurality of screws 28 inserted into the seat. This rack gear 29 has teeth on its upper surface, and one side thereof is formed with four grooves 30 as concave portions extending in the front-rear direction of the seat, and the inner side surface 30a of the groove gear 30 has a precision in the moving direction of the moving member 25. Well finished. on the other hand,
A fitting recess 31 that fits into the rack gear 29 is provided on the lower surface of the moving member 25, and a protrusion that fits into the four parts 30 is provided on one side in the seat width direction of the fitting recess 31 on the pinion gear side. A protrusion 32 as a section is integrally protruded, and a distal end surface 32a of the protrusion 32 facing the inner side surface 30a of the four stripes 30 is finished with high precision like the inner side surface 30a.

This prevents the movable member 25 from floating up relative to the guide member 23, and allows the rack gear 29 to mesh with a pinion gear, which will be described later, in an integrated manner.

Further, a substantially cylindrical housing 33 is integrally formed above the fitting recess 31 of the moving member 25.
A stator 34 is integrally formed on one end of the stator 314, and a metal sleeve 34a is press-fitted or ultrasonically welded into the stator 314. A driven shaft 35 is provided to pass through the housing 33.
A pinion gear 36 and a cam rotor 37 that mesh with the rack gear 29 are fixed to the cam rotor 37 . This cam rotor 37
is located inside the sleeve 34a, and its cam 37
A pair of first lock bins 38a and 38b are located at the counterclockwise ends of the sleeves 34a and 37b to restrict the clockwise rotation of the driven shaft 35 equipped with the cam rotor 37. It is interposed in contact with the Also, the cam surface 37a.

At the opposite end of 3b, that is, the clockwise end in the figure, there is also a pair of lock bins 39a and 3b of ff12, which similarly restrict the counterclockwise rotation of the cam rotor 37. No intervention has been made. And between these first and second lock bins 38a, 38b 139a, 39b,
Each cam surface 37a.

371) A pair of compression springs 40a, 40b biasing toward each other are discharged above.

Therefore, according to such a configuration, each cam surface 37a
, 37b on the first and second lock bins 38a, 38
b, 39a, 39b are compression links 40a, 4
0b to J: Since the cam rotor 37 is pressed toward both ends of the recam surfaces 37a and 37b, the cam rotor 37 maintains a locked state in which rotation in both directions is restricted within the sleeve 34a. Further, a pair of pressers 41a are provided between the outer circumferential surface of both ends of the cam rotor 37 and the inner circumferential surface of the sleeve 34a.
, Il, 1b is rotatably supported on the driven shaft 35. Therefore, by rotating the release member 41 in either direction, the first or second lock bins 38a, 38b, 3
It becomes possible to move the compression springs 40a, 40tz7) inwardly against the biasing force of the cam surfaces 37a, 37b to release the locked state. The driven shaft 35 can be rotated in a desired direction. In this case, since the sleeve 34a is made of metal with high strength and precision, it is durable and can always maintain stable locking strength.

Further, the release member 41 is pivotally supported by a support member 42 fixed to one end of the movable member 25 and connected to an operating rod 44 that is integrated with an operating member 43, so that it can be operated from the outside.

Next, the operation of the above embodiment will be described. By rotating the operation member 43 and rotating the release member 41 in a desired direction, the first lock bin 38a is released.

38b or the second lock bins 39a, 39b are moved by the release member 41 against the compression spring 408.40b, and the locked state is released.

Then, the cam rotor 37 and the pinion gear 37 rotate integrally with the driven shaft 35 in the same direction, and the movable member 25 moves due to the engagement between the pinion gear 37 and the rack gear 29. Therefore, the headrest 22 can be moved and adjusted steplessly in a desired direction. Then, when the operation of the operating member 43 is stopped, the rotation of the rotor 37 is regulated as described above, resulting in a locked state.

Further, in the above embodiment, the guide portion 24.2 of the guide member 23
After inserting the sliding part 26.26 of the moving member 25 into the slot 4, the screw 28 is loosened and the rack gear 29 is moved along the long hole 27, so that the inner side surface 30a of the four strip 30 is inserted into the tip surface 32 of the convex strip 32.
a, the distal end surface 32a on the movable member 25 side and the sliding portion 26 are inserted between the back side surface 30a and the guide portion 24 opposing this, and when the screw 28 is tightened, the guide member The rattling between 23 and the moving member 25 is eliminated,
It is possible to absorb variations in dimensional accuracy. Therefore, not only the moving member 25 can slide smoothly, but also the rack gear 29 and pinion gear 37 can mesh reliably.

Furthermore, after being assembled in this way, the concave line 30 and the convex line 32
are fitted into each other, and the rack gear 29 and the moving member 25 are integrated, and even if the guide member 23 or the moving member 25 is bent by a large load, the rack gear 29 and pinion gear 37 will not be separated greatly and will be able to mesh with each other. is maintained, the pinion gear does not go overboard, and feeding errors can be prevented.

Note that the present invention is not limited to the above embodiment. For example, the rack gear may be provided on the moving member side, and the pinion gear may be provided on the guide member side. Further, the concave portion may be provided on the moving member and the convex portion may be provided on the rack gear V. The recessed portion or convex portion installed on the rack gear can also be formed on the guide member near the rack gear.

(f) Effects of the Invention As is clear from the above, according to the configuration of the present invention, the movable member is moved relative to the guide member via the rack gear and the pinion gear by operating the operating member, thereby eliminating the front and rear positions of the headrest. Can be adjusted in stages. The headrest moves back and forth just by operating the operating member, and when the operating member is stopped, the headrest stops moving at that position, making adjustment extremely easy and allowing adjustment with only one hand. Furthermore, the meshing of the rack gear and pinion gear is integrated by fitting the concave portion and the convex portion on the rack gear side and the pinion gear side, and even if the guide member or the moving member is bent by a large load, misfeeding due to the pinion gear V is prevented. Is possible.

[Brief explanation of drawings]

1 and 2 show a conventional example, in which FIG. 1 is a vertical side view of a headrest, FIG. 2 is a perspective view of a longitudinal adjustment device, and FIGS. 3 to 7 are an embodiment of the present invention. Fig. 3 is a headrest, Fig. 4 is an exploded perspective view of the entire structure, Fig. 5 is an exploded perspective view showing how the rack gear is installed, Fig. 6 is a sectional view of the locking mechanism, and Fig. 7 is an exploded perspective view of the entire structure. ■-v■ in Figure 6
It is a sectional view along a line.

Claims (1)

[Claims] a guide member in the seat longitudinal direction provided at the top of the seat pack; a movable member fixed to the headrest side and guided by the guide member so as to be movable in the seat longitudinal direction; and one of the guide member and the movable member. A headrest longitudinal adjustment device comprising a fixed rack gear in the longitudinal direction of the seat and an operation member supported on the other side and having a pinion gear meshing with the rack gear, the device being formed on the rack gear side and the pinion gear side and relative to each other in the longitudinal direction of the seat. A headrest longitudinal adjustment device characterized by having a concave portion and a convex portion that are movably fitted to integrate the meshing of a rack gear and a pinion gear.