JP2898177B2 - Headrest device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a headrest body,
The present invention relates to a headrest device which is supported on a seat back so as to be vertically adjustable and forwardly movable through a stay extending downward from the headrest body.

[0002]

2. Description of the Related Art Conventional headrest devices are disclosed in, for example, Japanese Patent Application Laid-Open No. 62-125935 and
There is one disclosed in JP-A-158806.

[0003] That is, in the former, when the shoe is guided by the power device and lifted by the guide rail, the shoe comes into sliding contact with the cam member, and the shoe changes its direction, and the headrest is moved through the stay fixed to the shoe. It is intended to be brought forward.

[0004] The latter, from the relationship between the pinion and the rack,
When the connecting rod moves upward, the link swings, and the shaft and the stay holder swing together with the link,
When the stay holder swings, the headrest falls forward through the stay.

[0005]

However, in such a conventional headrest device, in the former, the shapes of the guide rail and the cam member are complicated, and they are separate from each other, so that they need to be assembled with high precision. There is a problem that the cost increases, and the latter has a problem that the cost increases because the number of components is large and the number of assembly steps is increased.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a headrest device capable of simplifying the shape and configuration and reducing the cost.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a headrest body (20) through a stay (21) extending downward from the headrest body (20). In the headrest device which is supported on the seat back (10) so that the vertical position can be adjusted and tilted forward, the lower end of the stay (21) is pivotally separated from the pivot (31) and upwardly with respect to the pivot (31). And a drive unit (4) capable of driving the pivot (31) in the vertical direction to move the headrest body (20) in the vertical direction via the stay (21).
0), and the pivot (3) is provided on the seat back (10).
1) and a guide for adjusting the vertical position of the cam follower shaft (35), which is fitted to be able to be guided in the vertical direction, so that the headrest body (20) can be guided and moved in the vertical direction via a stay (21). A groove (63) is formed. Similarly, the guide portion (63) for adjusting the vertical position is formed on the frame side of the seat back (10), and the drive portion (4) is formed.
When the pivot (31) is pushed up by (0), the cam follower shaft (35) shifts from the guide groove (63) for adjusting the vertical position and moves from its starting end (65) to its ending (66).
To the stay (2) about the pivot (31).
1) swings forward to form a forward-leaving guide groove (64) that allows the headrest main body (20) to fall forward, and an end portion of the forward-leaving guide groove (64), The cam follower shaft (35) is connected to the intermediate portion (63a) in the vertical direction of the position adjusting guide groove (63), and the cam follower shaft (35) is moved to the end portion when the driving shaft (31) is pushed down. To the intermediate portion (63a), and the pivot (3)
The headrest device according to the present invention is characterized in that the stay (21) swings rearward about 1) to form a guide groove (68) for erecting the headrest body (20) so as to be able to erect.

[0008]

[0009]

When the headrest body (20) is at the lower position, the pivot (31) and the cam follower shaft (35) are located in the guide grooves (63) for adjusting the vertical position, respectively.
The stay (21) is standing and the headrest body (2
0) is in an upright state. When the drive unit (40) is operated, the pivot (31) and the cam follower shaft (35) move upward in the guide grooves (63) for adjusting the vertical position, respectively, and move through the stays (21).
0) rises. As the headrest body (20) moves upward, the cam follower shaft (35) is eventually moved from the guide groove (63) for adjusting the vertical position to the guide groove (64) for tilting forward.
Side, and moves in the guide groove (64) for forward tilting.
As the cam follower shaft (35) moves in the guide groove (64) for forward tilting, the pivot (31) rises in the guide groove (63) for vertical position adjustment at this time. Accordingly, the stay (21) swings forward, and the headrest body (20) falls forward. When the headrest main body (20) is in the forward tilted state, the drive section (40) is operated, and when the pivot (31) descends in the guide groove (63) for vertical position adjustment, the cam follower shaft (35) is moved forward. The stay moves from the end of the inversion guide groove (64) to the erecting guide groove (68) and moves in the erecting guide groove (68), and the stay (21) swings backward. Move. Eventually,
The cam follower shaft (35) extends from the guide groove (68) for standing up to the intermediate portion (63) of the guide groove (63) for adjusting the vertical position.
When the procedure proceeds to a), the headrest body (20) comes to an upper position with the headrest body (20) standing up and down.

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, the headrest main body 20 is supported on the seatback 10 via a stay 21 extending upward, and a seatback frame (not shown) is provided inside the seatback 10, and the seatback frame is mounted on the seatback frame. Is fixedly provided with a housing 50.
A drive unit 40 for adjusting the vertical position of the headrest main body 20 and tilting the headrest body 20 forward is provided.

The housing 50 is formed in a box shape and is supported by the seat back frame with its opening facing rearward. Both side wall portions 52 of the housing 50 have a guide groove 53 for a pivot extending vertically and a cam follower. The guide grooves 54 for the shaft are formed so as to be aligned.

The pivots 3 are attached to both side wall portions 52 so as to be bridged.
The lower slider 37 made of resin is fitted to both ends of the pivot 31, and the pivot 3 is connected via the lower slider 37.
1 is fitted in the guide groove 53 for the pivot so as to be vertically movable. A relay member 32 is fixed to both ends of the pivot 31, and a stay holder 33 is fixed to the relay member 32, and a cam follower shaft 35, which is located below the pivot 31 and has its shaft directed sideways, is fixed. An upper slider 38 made of resin is fitted to the cam follower shaft 35, and the cam follower shaft 35 is similarly fitted to the cam follower guide groove 54 via the upper slider 38 so as to be vertically movable.

At the upper end of the guide groove 54 for the cam follower, a guide groove 55 for extending forward which extends obliquely forward and guides the cam follower shaft 35 is provided. The terminal end portion 56 of the guide groove 55 for forward tilting is a groove which bends forward and extends in the horizontal direction.

The headrest body 20 is urged through the stay 21 by the coil spring 34 wound around the pivot 31 in the direction of falling forward.

A drive motor 41 and a speed reduction mechanism 42 thereof are screwed to a front portion 51 of the housing 50.
A screw member 43 extends downward from the speed reduction mechanism 42, and a nut member 44 is screwed to the screw member 43. A locking recess 45 is formed on the front surface of the nut member 44, and the center of each side of the pivot 31 is rotatably fitted in the locking recess 45, and the pivot 31 is disengaged from the locking recess 45. To prevent this, a detachment prevention plate 46 is applied to the pivot 31 from the front, and is screwed to the nut member 44. The drive motor 41 and the speed reduction mechanism 42 and the like
0.

From the upper surface 58 of the housing 50 to the front 5
1, a long hole 59 for stay insertion is formed.

Next, the operation will be described. 3, when the headrest body 20 is at the lower position, the pivot 31 and the cam follower shaft 35 are moved through the lower slider 37 and the upper slider 38 into the guide groove 53 for the pivot and the guide for the cam follower shaft. Since each stay is in the groove 54, the stay 21 is restrained in a standing state regardless of the biasing force of the coil spring 34, and the headrest body 20 is in an upright state.

When the drive motor 41 of the drive section 40 is actuated, a speed reduction mechanism 42 and a screw member 43
The nut member 44 moves up and down, and the pivot 31 fitted into the locking recess 45 of the nut member 44 is driven upward. Accordingly, the pivot 31 and the cam follower shaft 35 move upward in the guide groove 53 for the pivot and in the guide groove 54 for the cam follower, respectively. Since the pivot 31 and the cam follower shaft 35 are still in the guide groove 53 for the pivot and the guide groove 54 for the cam follower, respectively, the headrest body 20 rises upright via the stay 21. The cam follower shaft 35 is resiliently pressed against the front edge of the cam follower shaft guide groove 54 by the urging force of the coil spring 34 while moving in the cam follower shaft guide groove 54.

When the headrest body 20 is raised,
Eventually, as shown by a broken line in FIG. 3, the cam follower shaft 35 reaches the upper end of the guide groove 54 for the cam follower shaft, and further the headrest body 20 rises, and the urging force of the coil spring 34 causes the cam follower shaft 3 to move.
5 automatically moves to the guide groove 55 for forward movement, and moves in the guide groove 54 for forward movement. When the cam follower shaft 35 moves in the guide groove 54 for tilting forward,
At this time, the pivot 31 rises in the guide groove 53 for the pivot, whereby the pivot 31 rotates, and the stay 21 swings forward through the stay holder 33 as shown by a solid line in FIG. When the cam follower shaft 35 reaches the end portion 55 of the guide groove 54 for forward tilting, the headrest main body 20 eventually tilts forward as indicated by a broken line in FIG. At this time, the stay 21 is a long hole 59 for stay insertion.
Insert inside.

Further, the pivot 31 is provided with a guide groove 53 for the pivot.
2, the stay holder 33 swings forward about the pivot 31, and the headrest body 20 further falls forward as shown by the imaginary line in FIG. 2. In a state where the headrest body 20 is tilted forward, a rear view is secured, and safety is improved.

In FIG. 2, when the drive motor 41 of the drive unit 40 rotates reversely when the headrest body 20 is in a forwardly inclined state, as shown by a broken line or an imaginary line, the nut member 44 moves along the screw axis of the screw member 43. Is moved downward, the pivot 31 moves down in the guide groove 53 for the pivot, and the cam follower shaft 35 moves to the guide groove 54 for forward tilt.
When it moves inside, the stay holder 33 swings backward about the pivot 31 and the stay 21 swings backward, and the cam follower shaft 35 is eventually moved from the guide groove 54 for forward tilt to the cam follower. When moving to the upper end of the shaft guide groove 54, the headrest main body 20 comes to an upper position with the headrest main body 20 standing up and down as shown by the broken line in FIG.

Further, when the drive motor 41 rotates in the reverse direction, the pivot 31 and the cam follower shaft 35 descend in the guide groove 53 for the pivot and the guide groove 54 for the cam follower, and the pivot 31 becomes the guide groove for the pivot. When the headrest body 53 is lowered to the lower end of the headrest 53, as shown by the solid line in FIG.

In the first embodiment, the guide groove 54 for the cam follower shaft is located in front of the guide groove 53 for the pivot shaft, and the guide groove 55 for tilting the guide groove 54 for the cam follower shaft is inclined forward. The guide groove 54 for the cam follower shaft is located on the rear side of the guide groove 53 for the pivot shaft, and the guide groove 55 for tilting the guide groove 54 for the cam follower shaft is inclined backward. May be done. In this case, the cam follower shaft 35 may be positioned below the pivot 31.

FIGS. 4 to 7 show a second embodiment of the present invention.

In this embodiment, a guide groove 63 for adjusting the vertical position is formed in the side wall 52 of the housing 50 so as to guide the pivot 31 and the cam follower shaft 35 in the vertical direction. A frontward guide groove 64 extending obliquely downward toward the front is continuous with the upper end of the front end. An erecting guide groove 68 for movably guiding the cam follower shaft 35 is provided so as to connect the end of the guide groove 64 for forward tilting and the intermediate portion 63a in the vertical direction of the guide groove 63 for vertical position adjustment. Is formed. As shown in FIG. 6, the standing guide groove 68 is a U-shaped cross-sectionally protruding groove that protrudes outward.

According to the present embodiment, when the headrest main body 20 is at the upper position, the drive unit 40 is operated and the pivot 31 is moved into the guide groove 63 for adjusting the vertical position, as shown by the broken line in FIG. When the cam follower shaft 35 moves upward, the cam follower shaft 35 moves from the upper end of the guide groove 63 for vertical position adjustment to the start end 65 of the guide groove 64 for forward tilt, and moves inside the guide groove 64 for forward tilt to the terminal end 66, The stay 21 swings forward. 7, when the cam follower shaft 35 moves to the end 66 of the guide groove 64 for forward tilt, the headrest body 20 tilts forward,
When the pivot 31 moves up the guide groove 63 for adjusting the vertical position, the headrest body 20 is further inclined forward as shown by an imaginary line in FIG.

In FIG. 5, when the headrest main body 20 is in a forwardly inclined state, as shown by a one-dot chain line or an imaginary line, the drive unit 40 is operated, and the pivot 31 moves down in the guide groove 63 for vertical position adjustment. Then, the cam follower shaft 35
Moves from the end of the front guide groove 64 to the upright guide groove 68, and moves in the upright guide groove 68. As shown by the broken line in FIG. Swings backward. Eventually, the cam follower shaft 3
When the headrest 5 moves from the guide groove 68 for standing up to the intermediate portion 63a of the guide groove 63 for adjusting the vertical position, the headrest main body 20 stands upright with the headrest body 20 standing upright as shown by a solid line in FIG. I will be.

In the above-described embodiment, the headrest body 20 is completely forwardly moved.
As shown in FIG. 5, a guide groove 73 for a pivot for guiding the pivot 31 and a guide groove 74 for a cam follower shaft for guiding the cam follower shaft 35 are provided, and the headrest main body 20 moves forward as it rises. Alternatively, the position of the headrest body 20 may be adjusted according to the reclining position, so that the sitting comfort may be improved.

[0030]

According to the headrest device of the present invention, when the drive unit moves the pivot and the cam follower shaft up and down in the guide groove for adjusting the vertical position, and the cam follower shaft moves in the frontward guide groove before long. When the stay swings forward, the headrest body falls forward, the pivot and cam follower shaft descend in the guide groove for vertical position adjustment, and the cam follower shaft moves in the guide for standing up. As the headrest body swings up and rises, the shapes of the guide groove for adjusting the vertical position, the guide groove for tilting forward and the guide groove for standing up are simplified, and the production is facilitated. The number of components is relatively small, the number of assembling steps is reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a headrest device showing a first embodiment of the present invention.

FIG. 2 is a side view of the headrest device according to the first embodiment of the present invention.

FIG. 3 is a side view of the headrest device according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a headrest device showing a second embodiment of the present invention.

FIG. 5 is a side view of a headrest device according to a second embodiment of the present invention.

FIG. 6 is a partial perspective view of a headrest device showing a second embodiment of the present invention.

FIG. 7 is a side view of a headrest device according to a second embodiment of the present invention.

FIG. 8 is a side view of a modified example of the present invention in a state where a headrest device is mounted.

FIG. 9 is a side view of a headrest device showing a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat back 20 ... Headrest main body 21 ... Stay 31 ... Axis 35 ... Cam follower shaft 41 ... Drive motor 42 ... Reduction gear 43 ... Screw member 44 ... Nut member 50 ... Housing 52 ... Side wall 53, 73 ... Axis guide groove 54, 74: Guide groove for cam follower shaft 55: Guide groove for forward tilt 63: Guide groove for vertical position adjustment 64: Guide groove for forward tilt 68: Guide groove for standing up

Claims (1)

(57) [Claims] 1. A headrest device comprising a headrest body supported on a seat back such that the headrest body can be adjusted up and down and forwardly tilted through a stay extending downward from the headrest body. A cam follower shaft that is upwardly separated from the pivot; and a drive unit that drives the pivot in the vertical direction to move the headrest body in the vertical direction via the stay. And a guide groove for adjusting the vertical position of the cam follower shaft, which is fitted so as to be able to be guided in the vertical direction, so that the headrest body can be guided and moved in the vertical direction via a stay. Side, the cam follower shaft extends to the guide groove for adjusting the vertical position, and the drive shaft pushes up the pivot. Serial guided to the terminal from the starting end moves from the guide groove for the vertical position adjustment,
A stay swings forward around the pivot to form a forward-leaving guide groove that allows the headrest body to fall forward, and an end portion of the forward-leaving guide groove, The cam follower shaft is guided from the terminal end to the intermediate portion when the drive shaft pushes down the pivot, and the stay swings rearward about the pivot. And a guide groove for erecting the headrest body so as to be able to erect the headrest body.