JPH0226366Y2 - - 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 safety 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.

The present applicant has already proposed Japanese Patent Application No. 112089/1989 in view of the problems of the conventional headrest. In the headrest of this application, a pillow body bracket is supported on a base bracket supported by a seat bag via a stay, so as to be movable back and forth, and a pinion supported on the pillow body bracket is engaged with a longitudinal rack provided on the base bracket. Combine,
On the other hand, a spiral wire is integrally provided in a portion of the stay that is integrated with the base bracket and is located inside the seat bag, and the screw gear screwed onto the shaft portion of the spiral wire and the pinion are respectively driven by an electric drive mechanism. This is what I did. According to this headrest, the longitudinal and vertical positions of the pillow body can be changed steplessly by operating a switch.

However, in this headrest, as its vertical position adjustment mechanism, a spiral wire separate from the stay is fixed to the stay, and this spiral wire is screwed onto the shaft of a screw gear that is rotationally driven at a fixed position within the seat back. Therefore, it was necessary to fix the stay and the spiral wire, which increased man-hours and increased costs. In addition, if the stay and the spiral wire are insufficiently fixed, there is a possibility that the pillow body cannot be adjusted up and down.

``Purpose of the invention'' The present invention is based on the discovery of such new problems in the headrest of Japanese Patent Application No. 112089/1989, and aims to solve them. That is, an object of the present invention is to further simplify the structure of the vertical adjustment mechanism of the headrest disclosed in Japanese Patent Application No. 112089/1989, and to improve the reliability of its operation.

``Summary of the invention'' The headrest of the present invention is an improvement from the patent application No. 112089/1989, in which a separate helical wire was fixed to the stay, and a male screw is directly attached to the portion of the stay located inside the seat back. The seat bag is characterized in that the screw gear is rotatably driven by an electric drive mechanism. That is, in the present invention, a pillow body bracket for fixing a pillow body is supported on a base bracket supported via a stay at the upper part of a seat bag so as to be movable back and forth via an interlocking link, and a rack is attached to this base bracket in the front and rear direction. is provided, and the pillow body bracket supports an electric drive mechanism equipped with a pinion having a rotation axis in the vertical direction, and this pinion is engaged with the rack, and further, in a portion of the stay located within the seat back,
The present invention is characterized in that a male threaded portion is directly formed, a female threaded portion formed at the center of the screw gear is screwed into the male threaded portion, and an electric drive mechanism for rotationally driving the screw gear is supported within the seat bag.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. A seat back plate 12 is located inside the seat back 11, and this seat back plate 12
A vertical movement mechanism 13 is fixed to. This vertical movement mechanism 13 supports stays 15, 15 fixed to the left and right sides of the lower part of the base bracket 14 so as to be vertically movable.

Link pivot holes 16, 16 are formed in the base bracket 14 on its front, rear, left and right sides, and the lower ends of interlocking links 18, 18 of approximately equal length are connected to the link pivot holes 16, 16 by pins 17, 17, respectively. It is pivoted. The upper ends of the interlocking links 18, 18 are pivoted to the front, rear, left and right sides of the pillow body bracket 20 by pins 19, 19. The pillow body bracket 20 has a base plate 20a on which the interlocking links 18, 18 are pivotally connected on the left and right sides thereof.
It consists of left and right brackets 20b, 20b coaxially fixed to the left and right sides of this board 20a with pins 19, 19, and these left and right brackets 20b, 20b.
The pillow body H is formed by wrapping the outer periphery with cloth or other soft material. According to this configuration, the pillow body bracket 2
0 (pillow body H), the interlocking link 18 moves in an arc around the link pivot hole 16, and the pillow body bracket 20 accordingly moves in the front and rear direction while slightly moving up and down. (See Figure 4).

A rack plate 22 having a front-back rack 21 is fixed to the upper surface of the base bracket 14. In contrast, the pillow body bracket 20
An electric deceleration motor unit 25 is fixed to the lower surface of the pillow body bracket 20a via a motor fixing bracket 23 and a fixing band 24, and a pinion 26 of the electric deceleration motor unit 25 is engaged with the rack 21. As shown in FIG. 5, the electric reduction motor unit 25 has a worm 28 driven by a forward/reverse rotation motor 27 meshed with a worm wheel 29, and the pinion 26 is integrally connected to the shaft of the worm wheel 29. is provided. The pinion 26 and the rack 21 have a thickness that allows them to maintain engagement even if the pillow body bracket 20 moves up and down slightly as it moves back and forth. Reference numeral 30 denotes a tension spring that pulls the pillow body bracket 20 rearward with respect to the base bracket 14 and prevents rattling due to backlash between the rack 21 and the pinion 26.

Next, the vertical movement mechanism of the base bracket 14, that is, the pillow body bracket 20, will be explained with reference to FIGS. 1, 3, and 6. One of the left and right stays 15, 15 fixed to the lower surface of the base bracket 14 has a male threaded portion 33 carved directly in its lower part. The vertical movement mechanism 13 fixed to the seat back plate 12 moves the base bracket 14 up and down via this male threaded portion 33. A vertical movement mechanism support plate 34 is fixed on the seat back plate 12. , this support plate 3
4, the electric deceleration motor unit 3 is attached via the motor fixing band 35 and the retaining bracket 43.
7 is fixed. Electric reduction motor unit 3
7 is a forward/reverse rotation motor 38 as shown in FIG.
, a worm 39 driven by the forward and reverse rotation motor 38, and a screw gear 40 that meshes with the worm 39.
A female threaded portion 41 into which the male threaded portion 33 is screwed is formed on the shaft portion. Screw gear 40
After the male threaded part 33 is screwed into the female threaded part 41, its upper and lower parts are sandwiched between bushes 42, 42, and these bushes 42, 42 are further connected to the vertical movement mechanism support plate 34 and this support plate 34. It is sandwiched between the screw gear 40 and a fixed retaining bracket 43 to prevent the screw gear 40 from coming off.

Therefore, in this apparatus having the above-mentioned configuration, when the forward/reverse rotation motor 27 of the electric reduction motor unit 25 is driven in the forward or reverse direction, the pinion 26 rotates. pinion 2
When the pinion 26 rotates, the rack plate 22 having the rack 21 meshing with the pinion 26 is fixed to the base bracket 14, so that the pinion 26 itself, that is, the electric deceleration motor unit 25
and the pillow body bracket 20 supporting this
(Pillow body H) moves back and forth, and the longitudinal position of pillow body H is adjusted.

Further, when the forward/reverse rotation motor 38 of the electric reduction gear motor unit 37 is driven, the screw gear 40 rotates. The screw gear 40 has a bush 42,
42, the male screw portion 33 of the stay 15 is supported so as not to move up and down via the vertical movement mechanism support plate 34 and the retaining bracket 43, and is screwed onto the female screw portion 41 of the screw gear 40.
does not rotate, the male threaded portion 33, that is, the stay 15 and the base bracket 14 as a whole move up and down, and the pillow body bracket 20 (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 force in the longitudinal direction and a force in the vertical direction is applied to the pillow body bracket 20 (the pillow body H), the deceleration mechanism consisting of the worm wheel 29 and the worm 28, and the deceleration mechanism consisting of the screw gear 40 and the worm 39, Since the pinion 26 and the screw gear 40 are prevented from reversing, the pillow body bracket 20 (the pillow body H) is prevented from inadvertently moving back and forth and up and down.

In the above embodiment, only one of the left and right stays 15 was provided with the male threaded portion 33, but the left and right stays 15 were each provided with the male threaded portion 33 by being carved directly, and the left and right male threaded portions 33 were connected to the electric reduction motor unit 37, respectively. It may be screwed onto the shaft of the screw gear 40.

Further, in the above embodiment, in order to rotate the pinion 26 and the screw gear 40 in the forward and reverse directions, the electric deceleration motor units 25 and 37 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 engaged with this rack, and an electric drive mechanism for this pinion. The position adjustment in the vertical direction can be performed using a male threaded part formed on the stay connected to the base bracket, a screw gear supported within the seat back and screwed into this male threaded part, and an electric drive mechanism for this screw gear. This can be done by The above rack and pinion mechanism,
The position of the pillow body can be adjusted steplessly using the screw gear mechanism that screws together the external threaded part and the male screw part, so according to the present invention, the position of the pillow body can be finely adjusted according to the occupant's physique and preferences to achieve a more accurate position. It becomes possible to obtain a driving posture. Also, the operation is
This can be done by simply turning on/off the electric drive mechanism and controlling the rotational direction of the electric motor, which provides excellent operability and eliminates the need for the occupant to feel the complexity of adjustment. Furthermore, since the present invention forms a male threaded portion directly on the stay, compared to Japanese Patent Application No. 112089/1989 filed by the present applicant, in which a spiral wire made of a separate member is fixed to the stay, Costs can be reduced by reducing the number of parts and man-hours, and since there is no risk of the male thread part rotating relative to the stay or falling off, the reliability of operation can be increased.
In particular, the adjustment of the vertical position of the pillow body is performed by a screw gear that is rotatably driven and has a male threaded portion formed directly on the outer periphery of the stay and a female threaded portion into which this male threaded portion is screwed. There is very little risk that the shaft center will shift, and stable vertical position adjustment can be performed without shaking in the front-rear direction. Furthermore, the front and back position of the pillow can be adjusted by fixing a rack to the base bracket, and supporting an electric drive mechanism equipped with a pinion having a vertical axis of rotation that engages the rack on the pillow bracket that can be moved in the front and back direction. Therefore, almost the entire length of the rack can be made into a range of longitudinal movement, and therefore a compact and high-performance adjustment function with a large adjustable amount compared to the thickness in the longitudinal direction can be obtained.

[Brief explanation of drawings]

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, Fig. 3 is an exploded perspective view of the vertical adjustment mechanism, and Fig. 4 is the front and rear of the headrest of the invention. FIG. 5 is a side view showing a moving state of the motor; FIG. 5 is a partially sectional view taken along the arrow V in FIG. 1; and FIG. 11... Seat back, 12... Seat back plate, 13... Vertical movement mechanism, 14... Base bracket, 15... Stay, 16... Link pivot hole, 18... Interlocking link, 20... Pillow bracket , 21...Rack, 25...Electric reduction motor unit, 26...Pinion, 27...Forward and reverse rotation motor, 33...Male thread portion, 37...Electric bundle reduction motor unit, 38...Forward and reverse rotation motor, 40...
Screw gear, 41...Female thread part, 43...Keeping bracket.

Claims (1)

[Claims for Utility Model Registration] A pillow body bracket for fixing a pillow body is supported on a base bracket supported via a stay at the upper part of the seat bag so as to be movable back and forth via an interlocking link. In addition to providing a rack in the direction, the pillow body bracket supports an electric drive mechanism including a pinion having a rotation axis in the vertical direction, the pinion is engaged with the rack, and the pinion is further positioned within the seat back of the stay. A headrest characterized in that a male threaded part is directly formed in the part, a female threaded part formed at the center of the screw gear is screwed into the male threaded part, and an electric drive mechanism for rotationally driving the screw gear is supported in the seat bag.