JPS6214932Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable headrest whose position can be adjusted in the longitudinal direction of the seat.

If the headrest of the seat can be moved and adjusted in the longitudinal direction or the vertical direction according to the body shape or preference of the seated person, the feeling can be further improved.

The purpose of the present invention is to provide a headrest that can be moved and adjusted in the front-rear direction of the seat in response to such requests, and includes a lower rail fixed to the head rest stay and a headrest that can be freely slid in the front-rear direction of the seat on the lower rail. Atsupah rail supported by,
a headrest body attached to the upper rail; a rack fixed to one of opposing surfaces of the lower rail and the upper rail; and a locking lever rotatably supported on the other side by a pivot pin; The rack has a ratchet engagement part formed along the front and back direction of the seat, and a front engagement piece and a rear engagement piece are formed protruding from the front and rear ends of the rack, respectively, and the locking The lever is formed with a pawl that can engage with the ratchet pawl, and one end of the spring is attached to a first locking portion formed between the pawl of the locking lever and the pivot pin that is the center of rotation. is locked, and the other end of the spring is formed on either the lower rail or the upper rail on which the locking lever is pivotally supported.
The pawl portion of the locking lever engages the ratchet portion when the first locking portion, the pivot pin, and the second locking portion are positioned in a straight line in the neutral position. The locking lever is biased by the spring in the meshing direction in which the locking lever engages with the ratchet meshing portion, and in the meshing release direction in which the claw portion of the locking lever is disengaged from the ratchet meshing portion, and the locking lever is biased in the meshing release direction. A stopper pin is provided to hold the locking lever at a predetermined release position when the locking lever is engaged, and the rearward movement of the upper rail is restricted by the engagement of the claw portion and the ratchet engagement portion, and the front portion of the rack is engaged. Either the mating piece or the rear engaging piece rotates the locking lever in the direction of releasing the engagement, and in the released position where the locking lever is held by the stopper pin, the locking lever is engaged with the ratchet engagement part by the biasing force of the spring. While maintaining the disengaged state, the locking lever is rotated in the meshing direction by either the front engaging piece or the rear engaging piece of the ratchet, and the claw portion of the locking lever is activated by the biasing force of the spring. This feature is characterized in that it is adapted to mesh with the ratchet engagement portion of the rack, which will become clearer from the detailed description below with reference to the drawings.

Figures 1 to 6 show one embodiment of the movable headrest according to the present invention, and in these figures, the headrest main body, designated as a whole by reference numeral 1, has a substantially rectangular shape; It consists of a frame, a pad, and a skin covering it. As shown in FIG. 1, this headrest main body 1 is disposed at the upper end of a seat back 2b in a seat 2 consisting of a seat cushion 2a and a seat back 2b.

As shown in FIG. 2, it is provided with a lower rail 10 fixed on a stay 11 attached to a seat back frame (not shown) of the seat back 2b, and both side edges of the lower rail 10 are bent into a substantially U-shape. A pair of guide grooves 10a, 10a are formed. A locking lever 12 having a claw portion 12a is rotatably supported by a pivot pin 12b on the front side of the upper surface of the lower rail 10, and the locking lever 12 is attached to the rear end of the lower rail 10. Spring 13 interposed between the side
Therefore, a biasing force is always applied in the meshing direction shown by arrow a in FIG. Also, a stopper 14 is located on the rotation locus of the locking lever 12 in the opposite direction.
is provided.

One end 13a of the spring 13 is connected to a first locking portion 21 formed between the claw portion 12a of the locking lever 12 and the pivot pin 12b which is the center of rotation.
In this embodiment, the other end 13b of the spring 13 is locked to a second locking portion 22 formed on the lower rail 10, which is the side on which the locking lever 12 is pivotally supported, and 21, the pivot pin 12b, and the second locking portion 22 are located in a straight line, that is, the locking lever 1 is in a neutral position with the dead center in between.
The engagement direction in which the claw portion 12a of the locking lever 12 engages with the ratchet engagement 18a, and the claw portion 12a of the locking lever 12.
is biased by the spring 13 in the direction of disengagement with the ratchet engagement portion 18a.

Reference numeral 15 denotes an upper rail that is slidably supported in the front and back direction of the seat 2 on the lower rail 10, and is bent so that its main body portion 15a is one step higher than both side edges 15b, 15b. 15b is fitted into the guide grooves 10a, 10a of the lower rail 10. The headrest body 1 is fixed onto the body portion 15a of the upper rail 15 with screws 16 and the like. Also, this Atsupah Rail 15
On the front edge of the lower rail 10 and the rear edge of the lower rail 10,
Notches 15c, 15c; 10b, 10b are formed respectively, and a pair of return springs 1 are inserted between these.
7 and 17 are spanned, and the upper rail 15 is always urged rearward.

Then, the main body part 15 of this upper rail 15
A rack 18 having a ratchet tooth portion 18a along the front and back direction of the seat 2 is provided at the center in the width direction on the lower surface of the rack 18, and is designed so that the ratchet tooth portion 18a can mesh with the claw portion 12a of the locking lever 12. It is composed of Further, the front and rear ends of the rack 18 are provided in a protruding manner so as to be able to engage with the side portions of the locking lever 12, and are formed with a front engagement piece 18b and a rear engagement piece 18c. . In addition,
Reference numeral 19 in FIG. 3 is a spacer for positioning the rack 18 on the same plane as the locking lever 12.

According to such a configuration, the headrest main body 1
is adjusted in the forward and backward directions as follows.

That is, as shown in FIG. 4, when the claw portion 12a of the locking lever 12 is biased by the spring 13 and meshes with the ratchet tooth portion 18a of the rack 18, this meshing state causes the upper rail 15 to move backward. Maintains a state in which movement to the side is restricted. Although this upper rail 15 cannot be pushed rearward, by pulling it forward, the claw portion 12a of the locking lever 12 is released into the locking lever 18.
The teeth can be engaged with the ratchet teeth 18a one by one, and their positions can be sequentially moved forward. Therefore, by performing this operation, it is possible to finely adjust the longitudinal position of the headrest main body 1 and fix it at a desired position to match the body shape or preference of the seated person.

When readjusting, pull the upper rail 15 forward, put the rear engaging piece 18c of the rack 18 against the locking lever 12, and push it against the spring 13, as shown in FIG. It is best to rotate it counterclockwise in the figure to disengage it.

What should be noted here is that when the locking lever 12 is rotated when the engagement is released, the spring 13 will overcome the dead center and its biasing direction will be reversed. The arrangement position of the spring 13 is set.

Then, the locking lever 12 is locked by the stopper 14 while being biased in the opposite direction.

According to the above configuration, the upper rail 15 moves rearward on the lower rail 10 by the action of the return spring 17, and reaches the rearmost position. At this time, the locking lever 12 remains locked to the stopper 14, and its claw portion 12a does not mesh with the ratchet tooth portion 18a of the rack 18.

When the upper rail 15 reaches the rearmost position, the front engaging piece 18b of the rack 18 hits the locking lever 12, as shown in FIG. 12a is now in a state where it can again mesh with the ratchet teeth 18a. Of course, the spring 13 overcomes the dead center by the rotation of the locking lever 12 and returns to its original state. Therefore, by sequentially pulling out the upper rail 15 forward from this state, it becomes possible to move and adjust the headrest 1 to the optimum position.

It should be noted that the above description merely shows one embodiment of the present invention, and it is obvious that various modifications and changes can be made to the shape, structure, etc. of each part without departing from the spirit of the present invention. . For example, a return spring 17 that urges the upper rail 15 rearward,
17 is not necessarily necessary, and the seated person may push the upper rail 15 rearward at the time of return, and the rack 18 and the locking lever 12
and lower rail 10 and upper rail 1 respectively.
5 can also be installed in reverse.

As explained above, according to the present invention, the upper rail on the headrest side and the lower rail on the seatback side are each provided with a rack and a locking lever that engages with the rack, so that when the upper rail is pulled forward, the position in the front and rear direction is In addition, the locking lever is released at the frontmost position and reengaged at the rearmost position, so the headrest can be moved and adjusted in the longitudinal direction of the seat, adjusting the body shape of the person sitting on the seat. It has the effect of being adjustable to the optimal position that suits your preference. Adjustment of the headrest in the vertical direction of the seat can be achieved by, for example, constructing a stay with a lower rail on the seat back frame so that it can be raised and lowered. The practical effects are significant.

[Brief explanation of drawings]

The figures show an embodiment of the movable headrest according to the present invention. Fig. 1 is a schematic perspective view of a seat with a headrest, Fig. 2 is an exploded perspective view showing the main parts in an enlarged manner, and Fig. 3 is an exploded perspective view of the seat with the headrest. The cross-sectional side view of the assembled state and FIGS. 4 to 6 are operational explanatory diagrams showing the relationship between the upper rail and the lower rail. In the figure, 1... Head rest main body, 10... Lower rail, 11... Stay, 12... Locking lever, 12a... Claw portion, 13... Spring, 14
...Stoppa, 15...Atsupa rail, 17...
...Return spring, 18...Rack, 18a...
Ratchet teeth, 18b, 18c...front and rear engagement pieces.

Claims (1)

[Scope of utility model registration request] A lower rail fixed to a headrest stay, an upper rail supported slidably in the front-rear direction of the seat on the lower rail, and a headrest main body attached to the upper rail, and surfaces of the lower rail and the upper rail that face each other. The rack has a rack fixed to one of the seats, and a locking lever rotatably supported by a pivot pin to the other, and the rack has a ratchet part formed along the front and back direction of the seat. A front engagement piece and a rear engagement piece are formed protruding from the front and rear ends of the rack, respectively, and the locking lever is formed with a pawl that can engage with the ratchet bit, and the locking lever One end of the spring is locked to a first locking portion formed between the claw portion of the lever and the pivot pin, which is the center of rotation, and the other end of the spring is connected to the side on which the locking lever is pivoted. The first locking portion, the pivot pin and the second
The claw portion of the locking lever engages with the ratchet bite portion in a neutral position in which the locking portion is located on a straight line, and the claw portion of the lock lever is disengaged from the ratchet bite portion. A stopper pin is provided which is biased by the spring in the disengagement direction and holds the disengagement lever at a predetermined disengagement position when the disengagement lever is biased in the disengagement direction. The rearward movement of the upper rail is restricted by the engagement between the pawl portion and the ratchet engagement portion, and the locking lever is rotated in the direction of disengagement by either the front engagement piece or the rear engagement piece of the rack. In the released position where the locking lever is held by the stopper pin, the locking lever is held in a disengaged state with the ratchet engagement portion by the biasing force of the spring, and either the front engagement piece or the rear engagement piece of the ratchet is engaged. On the other hand, the movable headrest is characterized in that the locking lever is rotated in the engaging direction, and the pawl portion of the locking lever is configured to mesh with the ratchet portion of the rack by the bias of the spring.