JPH0721149Y2 - Car seat headrest - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement in a headrest of an automobile seat.

(Prior Art) Conventionally, various automobile seats, particularly those having a headrest provided on a rear seat have been put into practical use.

The headrest of the rear seat is generally a fixed type and always protrudes from the upper part of the seatback, so that not only the appearance is poor, but also there is a problem that the rear view is obstructed during back driving.

Therefore, the present applicant has proposed a new automobile seat headrest in Japanese Patent Application No. 1-109936.

According to this, when not in use, the headrest body is stored in the recess formed in the upper part of the seat back,
The headrest body becomes a part of the seat back to improve the appearance, and the rear view is not obstructed during back driving.

Also, when not in use, when the lock mechanism is released, the ball protrudes above the recess of the seat back while being swung by the swing mechanism and the biasing mechanism, so that the ball cannot be seen and the appearance is improved as in the conventional case. At the same time, the climbing operation is smooth and gives a high-class feel.

(Problems to be solved by the invention) By the way, when a link is used as the swinging mechanism, there is a problem that the number of parts increases and the assembling property is poor.

Therefore, the base frame is fixed in the recess, the guide frame is fixed to the headrest body, and the left and right rising edges of the base frame are fitted into the vertical slots formed in the left and right falling portions of the guide frame, respectively. It is conceivable to use an elevating mechanism that fits a guide shaft supported by the section to guide the guide frame in the vertical direction.

However, the elevating mechanism including the left and right elongated holes and the guide shaft has a problem that it is not possible to effectively prevent the left and right tilts associated with the elevating and lowering of the guide frame (headrest main body).

The present invention has been made to solve the above problems, and it is an object of the present invention to reliably prevent the lateral inclination of the guide frame ascending and descending only by adding a simple configuration.

(Means for Solving the Problems) For this reason, the present invention is directed to a vehicle seat headrest in which a headrest body housed in a recess formed in an upper portion of a seatback is made to project above the recess by an elevating mechanism. The elevating mechanism includes a base frame fixed in the recess and a guide frame fixed to the headrest body, and the left and right falling portions of the guide frame have vertical elongated holes. And a long hole in the front-back direction are respectively formed, on the left of the base frame,
A guide shaft that fits in an elongated hole in the vertical direction is rotatably supported on the right rising portion, and a guide pin that fits in the elongated hole in the front-rear direction is attached to links fixed to both ends of the guide shaft. Are supported respectively.

(Effects and effects of the invention) The present invention, as an elevating mechanism, includes vertical guide holes of the left and right falling portions of the guide frame, the guide shaft of the base frame, and the guide pin of the guide shaft link. The guide frames are fitted in the longitudinal holes of the left and right falling portions in the front-rear direction.

Therefore, even if the guide frame moves up and down while being guided in the vertical direction by the guide shaft and the vertical holes, the front and rear long holes are blocked by the guide pins that synchronize with the left and right even if the guide frame tilts left or right. As a result, the guide frame does not tilt to the left and right, and the headrest body moves up and down smoothly.

Further, since the guide frame is provided with the elongated hole in the front-rear direction and the guide shaft is provided with the link and the guide pin, the structure is simple and the assembling property is good.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 10 (a) and 10 (b), a recess 12 is formed in the upper part of the seat back 11 of the rear seat 10, and the headrest main body 13 is provided in the recess 12 and the outer surface of the seat back 11. It is stored so that it is flush with.

When the headrest body 13 is pushed by hand,
As shown in FIGS. 11 (a) and 11 (b), an elevating mechanism 14 to be described later causes the structure to project (pop up) above the recess 12.

As shown in FIG. 1, a substantially inverted U-shaped guide frame 16 is fixed to the headrest body 13, and falling portions 16a and 16b are integrally formed on both left and right sides of the guide frame 16.

A substantially U-shaped base frame 17 is fixed to the recess 12 of the seat back 11, and rising portions that fit inside the falling portions 16a and 16b of the guide frame 16 are formed on both left and right sides of the base frame 17. 17a and 17b are integrally formed.

At the front and rear positions of the respective falling portions 16a, 16b of the guide frame 16, elongated holes 16c, 16d are formed in a vertical arc shape having a radius of an imaginary center O (see FIG. 2). In front of the long hole 16c, a long hole 16e is formed in the front-back direction, in other words, in a direction perpendicular to the long hole 16c.

At the rear positions of the rising portions 17a, 17b of the base frame 17, short rear guide shafts 18, which fit into the long holes 16d, 16d at the rear positions of the falling portions 16a, 16b of the guide frame 16,
18 are fixed respectively.

The guide frame 1 is provided in front of the rising portions 17a and 17b.
A long front guide shaft (stabilizer) 19 fitted in the long holes 16c, 16c at the front positions of the respective falling portions 16a, 16b of 6 is rotatably penetrated.

One link 20 is provided at one end of the guide shaft 19.
a is fixed, and the other link 20b is non-rotatably fitted to the other end of the guide shaft 19 and fixed by being fastened with a nut 21.

Guide pins 22a, 22b fitted into the longitudinal holes 16e, 16e of the respective falling portions 16a, 16b of the guide frame 16 are fixed to the respective links 20a, 20b.

If the lifting mechanism 14 is configured as described above, the guide frame
16 is a front and rear guide shafts 19 and 18 and a vertically elongated hole 16
It is vertically guided by c and 16d to move up and down between a storage position (see FIG. 4), an intermediate position (see FIG. 3), and a raised position (see FIG. 2).

Following this elevating and lowering of the guide frame 16, the links 20 are formed through the guide pins 22a and 22b by the longitudinal holes 16e and 16e in the front-rear direction.
The a and 20b rotate up and down together with the front guide shaft 19.

While raising and lowering the guide frame 16,
If tilting force is applied to the left or right, guide pins 22a, 22
Since b is rotated synchronously by the links 20a, 20b and the front guide shaft 19, the elongated hole 16e (16e) in the front-rear direction on which the tilting force acts is blocked by the guide pin 22a (22b). Therefore, the guide frame 16 does not tilt.

As a result, the headrest body 13 moves up and down smoothly.

On the other hand, as shown in FIG. 1, an urging mechanism 26 for urging the guide frame (headrest main body 13) 16 in the ascending direction is provided.

The urging mechanism 26 is composed of a long coil spring 27 wound around the front guide shaft 19, and the coil spring 27
One end portion 27a of 27 is hooked on a spring hooking portion 17c of a rising portion 17b of the base frame 17, and the other end portion 27b is connected to the link.
It is hung on 20a.

In this case, the guide frame 16 is biased in the upward direction via the link 20a, the guide pin 22a, and the elongated hole 16e.

The other end portion 27b of the coil spring 27 may be fixed to the spring pin by driving a spring pin into the front guide shaft 19.

In this case, the guide frame 16 is urged in the upward direction via the spring pin, the front guide shaft 19, the links 20a and 20b, the guide pins 22a and 22b, and the elongated holes 16e and 16e.

If the biasing mechanism 26 is configured as described above, the coil spring 27 is wound around the front guide shaft 19, so that the coil spring 27 can be set to a long size and the spring force can be sufficiently charged. The climb can be done smoothly.

Further, as compared with the method of attaching wire springs to the rising portions 17a and 17b of the base frame 17 to urge the guide frame 16 in the ascending direction, it can be wound around the front guide shaft 19, which is advantageous in space.

Next, as shown in FIGS. 5 to 7, a cushioning mechanism (damper) 30 is provided to cushion (decelerate) the upward bias of the guide frame (headrest body 13) 16 by the biasing mechanism 26. There is.

The buffer mechanism 30 includes a first link 31, 31 and a first link 31, 31.
A second link 32 sandwiched between and each first link 3
A lower part of the 1, 31 and an upper part of the second link 32 are connected by a pin 33 so as to be vertically rotatable.

A sector gear 34 centered on the pin 33 is formed on each first link 31.

At the center of the left and right surfaces of the second link 32, small gears 35, 35 meshing with the respective sector gears 34, 34, and the small gears 35, 35
The speed-increasing gears 37, 37 composed of a large gear 36, 36 integrated with the shaft 38 are respectively supported by the shaft 38, and a large number of dampers 39, ..., 39 are mounted around the gears 36, 36 of the second link 32. The input gears 40, ..., 40 of the dampers 39, ..., 39 mesh with the large gears 36, 36.

It is not always necessary to provide a large number of dampers 39, but only one damper 39 may be provided on one surface of the second link 32.

An upper portion of the first link 31 is connected to a shaft 42 (a lock shaft of a lock mechanism can be used) 42 supported by the guide frame 16, and a lower portion of the second link 32 is a shaft 43 fixed to the base frame 17. Are linked to.

If the buffer mechanism 30 is configured as described above, the guide frame
When 16 is urged by coil spring 27 and rises,
The speed increasing gear 37 is rotated by the sector gear 34 of the link 31, the input gear 40 of the damper 39 is rotated by the speed increasing gear 37, the damper 39 acts, and the rising speed of the guide frame 16 is buffered (decelerated). Become so.

Therefore, the guide frame 16 does not rise suddenly due to the bias of the coil spring 27, so that the guide frame (headrest main body 13) 16 feels heavy when it is raised.

Further, since the gears 34 to 37, 40 are attached to the first link 31 and the second link 32 which are connected to each other by the pin 33, the gears 34 to 37, 40 are attached.
-37, 40 can be adjusted as a unit in advance, and assembly adjustment can be easily done.

FIG. 8 shows a first modification of the buffer mechanism 30, in which the sector gear 46 is fixed to the front guide shaft 19 of the lifting mechanism 14.
The input gear 40 and the speed increasing gear 44 of the damper 39 are attached to the rising portion 17b of the base frame 17, and the speed increasing gear 44 is constituted by meshing with the sector gear 46.

With this configuration, when the guide frame 16 is biased by the coil spring 27 and moves up, the speed increasing gear 44 is rotated by the sector gear 46 that rotates together with the front guide shaft 19, and the speed increasing gear 44 causes the damper 39 to rotate. The input gear 40 is rotated, the damper 39 acts, and the rising speed of the guide frame 16 is buffered (decelerated).

The other end portion 27 of the coil spring 27 of the biasing mechanism 26 is
b may be hooked on the spring hooking portion 46a of the sector gear 46.

FIG. 9 shows a second modified example of the buffer mechanism 30, in which one end portion 45a of a cylindrical air damper 45 is attached to the base frame 1 described above.
7 and the other end portion 45b is connected to the guide frame 16 so as to be configured.

With this configuration, when the guide frame 16 is biased by the coil spring 27 and rises, the air damper 45 is extended and the damper acts, so that the rising speed of the guide frame 16 is buffered (decelerated). .

[Brief description of drawings]

FIG. 1 is a perspective view of a headrest lifting mechanism according to the present invention,
2 is a side view of the headrest in the raised position, FIG. 3 is a side view of the headrest in the middle position, FIG. 4 is a side view of the retracted position of the headrest, and FIG. 5 is a side view of the cushioning mechanism in the raised position. 6 is a side view of the storage position of the cushioning mechanism, FIG. 7 is a front view of FIG. 5, FIG. 8 is a perspective view of a first modification of the cushioning mechanism, and FIG. 9 is a perspective view of a second modification. 10 (a) is a side view of the retracted position of the headrest, FIG. 10 (b) is a perspective view of FIG. 10 (a), and FIG. 11 (a) is a side view of the raised position of the headrest. FIG. 11B is a perspective view of FIG. 11A. 10 …… Rear seat, 11 …… Seat back, 12 …… Concave,
13 …… Headrest body, 14 …… Elevating mechanism, 16 …… Guide frame, 16c, 16d …… Vertical long hole, 16e …… Front and rear long hole, 17 …… Base frame, 19 …… Front guide shaft , 20a, 20b …… link, 22a, 22b …… guide pin,
26 …… Biasing mechanism, 27 …… Coil spring, 30 …… Cushioning mechanism, 31,32 …… Link, 34,46 …… Sector gear, 37,4
4 ... Accelerating gear, 39 ... Damper.

Claims (1)

[Scope of utility model registration request] 1. A headrest for an automobile seat, wherein a headrest main body housed in a recess formed in an upper portion of a seat back is made to project above the recess by an elevating mechanism, wherein the elevating mechanism is in the recess. And a guide frame fixed to the headrest main body, and vertical slots and longitudinal slots are formed in the left and right falling portions of the guide frame, respectively. Guide shafts fitted in vertically elongated holes are rotatably supported at the left and right rising portions of the base frame, and the guide shafts in the front-rear direction are attached to links fixed to both end portions of the guide shaft, respectively. A headrest for an automobile seat, characterized in that guide pins fitted into the long holes are respectively supported.