JPH0454447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a headrest provided on the upper part of a vehicle seat, and particularly to a device for adjusting its longitudinal and vertical positions.

"Prior Art and its Problems" This type of headrest is attached to the upper part of the seat back with the main purpose of ensuring the stability of the occupant's head position and the safety of the occupant in the event of a rear-end collision. It is desirable that the position of this headrest can be adjusted according to the occupant's physique and preferences, and various adjustment mechanisms have been proposed in the past, but conventional devices have been able to adjust the front and rear positions and up and down positions in multiple stages. However, the adjustable positions are coarse and cannot accommodate the more detailed demands of the occupants. In addition, it is difficult to operate because the operator must manually move the pillow back and forth or up and down, and for this reason, even though the headrest has an adjustment mechanism, it is often not used. Ta.

``Purpose of the Invention'' The purpose of the present invention is to solve the problems of conventional headrests, and to provide a headrest that allows stepless position adjustment in the front-rear and up-down directions, and that can be operated with power. shall be.

The present invention also relates to a headrest that can reliably position a pillow.

"Summary of the Invention" The headrest of the present invention comprises: a base bracket supported via a stay on the upper part of a seat bag; a pillow body bracket supporting the base bracket so as to be movable back and forth and fixing a pillow body; and a headrest provided on the base bracket. A rack in the front-rear direction, a pinion supported on the pillow body bracket and meshing with the rack, an electric drive mechanism having a worm gear and a worm wheel for driving the pinion, and the stay integrally provided in a portion of the stay located inside the seat back. A spiral wire was suspended downward from the seat bag, and was supported substantially directly below the spiral wire within the seat bag. It is characterized by having a screw gear to which the helical wire is screwed into the shaft portion, and an electric drive mechanism that rotationally drives the screw gear to move the helical wire up and down.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. Left and right stays 13, 13 are vertically movably inserted into and supported by left and right support tubes 12, 12 in the seat bag 11, and the upper ends of these stays 13, 13 are fixed to a base bracket 14. The base bracket 14 has link pivot holes 15, 15 formed on the front, rear, left and right sides of its lower part, and also has link mounting holes 15, 15 formed on its upper left and right sides.
Guide elongated holes 16, 16 in the front-rear direction are formed. A long hole 19 in the vertical direction is bored at the upper end of the interlocking link 18 of approximately equal length formed by a pin 17 in each link pivot hole 15.
9 and the pin 20 inserted into the guide slot 16,
They are each fixed to the pillow body bracket 21.
The pillow body bracket 21 includes left and right brackets 21a,
It consists of a central bracket 21b and an outer peripheral bracket 21c, and the pin 20 is fixed to the left and right brackets 21a and the central bracket 21b. A pillow body H, on which the occupant's head abuts, is fixed to the outer periphery of the outer peripheral bracket 21c.

According to this configuration, the moving direction of the pillow body bracket 21 is guided in the front-back direction by the guide elongated hole 16 and the pin 20, and when a force in the front-rear direction is applied to the pillow body bracket 21, the interlocking link 18 moves toward the pin 17.
The pillow body bracket 21 moves back and forth without tilting while the pin 20 moves vertically relative to the elongated hole 19 (see FIG. 4).

A rack plate 23 having a front-back rack 22 is fixed to the upper surface of the base bracket 14. In contrast, the pillow body bracket 21
An electric deceleration motor unit 25 having a pinion 24 that meshes with the rack 22 is fixed to the lower surface of the central bracket 21b via a fixed bracket 26.

As shown in FIG. 3, the electric reduction motor unit 25 has a worm gear 28 driven by a forward/reverse rotation motor 27 meshed with a worm wheel 29, and the pinion 24 is integrally connected to the shaft of the worm wheel 29. is provided.

Below the stay 13 located inside the seat back 11, a spiral wire (geared cable,
geared cable) 30 is connected with rotation restraint. The spiral wire 30 has a series of spiral protrusions 30a around the wire, and is flexible as a whole, so it is suitable for placement within the curved seat back 11. This spiral wire 30 is
For example, it can be securely fixed to the stay 13 by inserting it into the stay 13 made of a hollow pipe and caulking the stay 13.

The spiral wire 30 is suspended downward within the seat bag 11, and is screwed into the shaft portion of a screw gear 31 made of a worm foil located substantially directly below the spiral wire 30. This screw gear 31 meshes with a worm gear 32 as shown in FIG. The worm gear 32 is driven by a forward and reverse rotation motor 33. The forward/reverse rotation motor 33, the worm gear 32, and the screw gear 31 are also connected to the electric reduction motor unit 35.
It is configured as , and is held at a fixed position within the seat bag 11 .

Therefore, in this apparatus having the above-mentioned structure, when the forward/reverse rotation motor 27 of the electric reduction motor unit 25 is driven in the forward or reverse direction, the pinion 24 rotates. pinion 2
4 rotates, since the rack 22 meshing with the pinion 24 is fixed to the base bracket 14, the pinion 24 itself, that is, the electric deceleration motor unit 25 and the pillow body bracket 21 that supports it, The body H) moves back and forth, and the back and forth position of the pillow body H is adjusted.

Further, when the forward and reverse rotation motor 33 of the electric deceleration motor unit 35 is driven, the screw gear 31 rotates, and the screw gear 31 is supported so as not to move up and down, and the spiral wire 30 itself does not rotate. Move up and down. As a result, the entire stay 13 and base bracket 14 move up and down, and the pillow body bracket 21 (pillow body H), which is supported by the base bracket 14 so as to be adjustable in its longitudinal position, moves up and down.

When a rearward force is applied to the pillow body H by the occupant's head or when the pillow body H is pushed forward by a passenger in the rear seat, the deceleration mechanism consisting of the worm wheel 29 and the worm gear 28 is activated by the pinion. 24 is prevented from reversing (stopper effect), the pillow body bracket 21 (the pillow body H) does not move back and forth inadvertently.

Also, when an upward force is applied to the pillow body H,
Since the speed reduction mechanism consisting of the screw gear 31 and the worm gear 32 prevents the screw gear 31 from reversing, the pillow body bracket 21 (the pillow body H) does not move upward inadvertently.

Furthermore, if a downward force is applied to the pillow body H due to the weight normally acting on it, or if a downward force is applied to the pillow body H by pushing it from above, the spiral wire suspended downward via the stay 13 30 causes the downward force by the pillow pair H to act linearly downward on the screw gear 31 located substantially directly below it. Therefore, the downward force is reliably supported by the spiral wire 30, which is prevented from moving downward by the screw gear 31, so that the pillow body bracket 21 (the pillow body H) does not move downward inadvertently. Never.

In the above embodiment, the spiral wire 30 was provided only on one of the left and right stays 13, but the left and right stays 13
A helical wire 30 is fixed to each of the left and right helical wires 30 and suspended downward, and the left and right helical wires 30 are connected to an electric deceleration motor unit 35 arranged approximately directly below them.
It may also be configured to be screwed onto the shaft portion of the screw gear 31. According to this, the pillow body H can be supported more reliably by the left and right spiral wires 30, 30 hanging downward.

Further, in the above embodiment, in order to rotate the pinion 24 and the screw gear 31 in the forward and reverse directions, electric reduction motor units 25 and 35 having these components in the unit are used, which has the advantage that the device configuration is easy. , these may be driven in the forward and reverse directions by another electric mechanism different from the embodiment.

``Effects of the Invention'' As described above, the headrest of the present invention can adjust its position in the longitudinal direction by a rack provided on the base bracket, a pinion supported by the pillow body bracket and meshing with the rack, and an electric drive mechanism for this pinion. It can be done with Furthermore, when a force in the longitudinal direction is applied to the pillow body, the deceleration mechanism consisting of a worm wheel and a worm gear prevents the pinion from reversing, thereby preventing the inconvenience of the pillow body H inadvertently moving back and forth. can.

Further, vertical position adjustment can be performed using a spiral wire connected to a stay connected to the base bracket, a screw gear supported within the seat back and screwed to the spiral wire, and an electric drive mechanism for the screw gear. can. Moreover, when a downward force is applied to the pillow body, the spiral wire hanging down through the stay applies the downward force of the pillow body linearly to the screw gear located almost directly below it, so that the downward force is applied to the pillow body. The force can be reliably supported by the spiral wire whose downward movement is prevented by the screw gear, and the pillow body can be prevented from inadvertently moving downward. In addition, the upward force applied to the pillow body is reliably regulated by the spiral wire, which is prevented from moving upward by the screw gear.
Thereby, it is possible to prevent the pillow body from moving upward inadvertently.

The position adjustment using the above-mentioned rack and pinion mechanism and the screw gear mechanism screwed together with the spiral wire can be performed steplessly. It is possible to obtain a more correct driving posture by adjusting the Moreover, since the operation can be performed only by turning on/off the electric drive mechanism and controlling the rotational direction of the electric motor, the operation is excellent, and the occupant does not feel the complexity of adjustment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the headrest of the present invention, FIG. 2 is an exploded perspective view of the longitudinal adjustment mechanism, and FIG. 3 is a partially sectional view taken in the direction of the arrow in FIG.
FIG. 4 is a side view of the same, and FIG. 5 is a sectional view showing an example of an electric reduction motor unit of the vertical adjustment mechanism. 11...seat back, 13...stay, 14
... Base bracket, 16 ... Guide slot, 18
... Interlocking link, 21 ... Pillow bracket, 22
...Rack, 23...Rack plate, 24...
Pinion, 25...Electric reduction motor unit, 2
7... Forward/reverse rotation motor, 28... Worm gear,
29... Worm foil, 30... Spiral wire,
31... Screw gear, 32... Worm gear, 33... Forward/reverse rotation motor, 35... Electric reduction motor unit.

Claims (1)

[Scope of Claims] 1. A base bracket supported on the upper part of the seat bag via a stay; A pillow body bracket supported on this base bracket so as to be movable back and forth and fixing a pillow body; Rack; An electric drive mechanism having a pinion supported on the pillow body bracket and meshing with the rack, and a worm gear and a worm wheel that drives the pinion; a spiral wire hanging downward; a screw gear supported substantially directly below the spiral wire in the seat bag to screw the spiral wire onto the shaft; and a screw gear that is rotationally driven to move the spiral wire up and down. A headrest characterized by having an electric drive mechanism.