JPS5927173Y2 - Automobile headrest front and back adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automobile headrest longitudinal adjustment device that allows the longitudinal position of a headrest attached to the upper part of an automobile seat to be adjusted according to the seating posture of an occupant.

A conventional headrest longitudinal adjustment device of this type includes, for example, a frame in which a frame of a headrest body made of a frame and a pad material surrounding the frame is fixed to the upper ends of a pair of poles that are connecting members to the seat back. The frame is connected to the body so as to be horizontally movable back and forth via a parallel link, and the frame is provided with a meshing member driven by the bundle, and the frame is provided with a meshing portion that meshes with the meshing member to rotate the bundle. Accordingly, it has been proposed that the position of the headrest body can be adjusted back and forth by relatively changing the engagement position between the engagement member and the engagement portion (see Japanese Patent Laid-Open Publication No. 54-127762).

However, in the above-mentioned conventional type, the headrest main body is adjusted back and forth by using the engagement between the engagement member on the frame side and the engagement part on the frame body side, so the backlash of the engagement part can cause backlash. The adjustment error is large,
The problem was that machining the small meshing parts was troublesome and required high-precision machining.

The present invention has been made in view of this point, and instead of adjusting the back and forth movement of the frame relative to the frame body by the engagement of the engagement member and the engagement portion as in the past, the present invention is made by adjusting the movement of the frame relative to the frame body between the frame and the frame body. By swinging the mounted plate member by driving an eccentric cam provided on the frame side, the close engagement between the plate member and the eccentric cam prevents looseness between the frame and the frame body. It is small, and the front and rear positions of the headrest body can be adjusted with high precision.In addition, only machining is required to make holes such as openings for inserting eccentric cams in the plate member, making machining easy and improving adjustment accuracy. It is an object of the present invention to provide an automobile headrest adjustment device that is excellent in both workability and workability.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows a seat device for an automobile, in which 1 is a seat cushion, 2 is a seat back whose lower end is rotatably connected to the rear end of the seat cushion 1, and the seat back 2 is a lower seat back 3 and the lower seat back 3
It consists of an upper seat back 5 that is connected to the upper side and changes its angle with respect to the lower seat back 3 by operating the operating bundle 4, and a headrest is provided at the upper end of the upper seat back 5 (the upper end of the seat back 2). 6 is removably attached.

As shown in enlarged detail in FIGS. 2 and 3, the headrest 6 includes a rectangular box-shaped frame 8 having left and right side walls 7, 7, and a pad material 9 surrounding the frame 8 by a predetermined thickness. a headrest main body 10, a frame 12 located at the lower part of the frame 8 and having left and right side walls 11.11, an upper end fixed to the frame 12, and a locking recess 13.13 at the lower end. ．． ..., and the locking recesses 13, 13
A pair of poles 14 and 14 are provided, which are latched and held to the upper seat back 5 to support the headrest main body 10 at a position above the upper seat back 5 (seat back 2).

The upper part of each side wall 7 of the frame 8 and each side wall 1 of the frame body 12
1, two link arms 15, 15 having the same length are attached to the side walls I, 11, respectively, and engaging pins 16, 16 .・・・
The headrest main body 10 is connected to the pole 14 by a parallel link 17.
It is configured to be horizontally movable back and forth with respect to 14.

Note that 15a is a connecting plate that connects the left and right opposing link arms 15, 15.

Further, a camshaft 18 is supported on one sidewall 7 of the frame 8 and extends in the left-right direction through the sidewall 7, and one end of the camshaft 18 protrudes outward from the headrest main body 10 and is attached to the one end. While the handle 19 is attached, an eccentric cam 20 is fixed to the other end of the camshaft 18, and a friction clutch 21 equipped with a spring 21a is attached to the camshaft 18. The eccentric cam 20 is rotated only by the operation of the nozzle 19, and the rotation of the eccentric cam 20 is prevented by the friction clutch 21 in other cases.

Further, a substantially diamond-shaped plate member 22 is disposed between the side walls 7 and 11 of the frame 8 button and the frame body 12, and the eccentric cam 20 is closely inserted into the center of the plate member 22. A possible opening 23 is formed in the upper and lower portions of the opening 23, respectively, and long holes 24, 24 extending in the vertical direction are formed, respectively.
An eccentric cam 20 is rotatably inserted into the opening 23, and a frame-side shaft member 25 fixed to the side wall 7 of the frame 8 is inserted into the elongated hole 24 on the upper side of the casing, and into the elongated hole 24 on the lower side. is a frame body side shaft member 26 fixed to the side wall 11 of the frame body 12;
are respectively inserted and pivoted, and the buttons are pressed.By rotating the handle 19, the headrest main body 10 is moved horizontally and parallel to the poles 14, 14 relative to the frame 12. It is configured so that its front and rear positions can be adjusted.

Next, the operation of the above embodiment will be explained. When the occupant of a car wants to move the headrest 6, for example, to the front side to match his/her seating position,...
When the is rotated counterclockwise in FIG. 3, the eccentric cam 20 also tries to rotate counterclockwise in FIG. 3, causing the plate member 22 to move backward (toward the right in FIG. 3). push.

However, since the upper and lower portions of the plate member 22 are locked to the frame-side shaft member 25 and the frame-side shaft member 26, and relative movement in the front-rear direction is restricted, the eccentric cam 20 is conversely moved by the reaction force. Pushed forward (leftward in Figure 3).

As a result, when the eccentric cam 20 rotates, the eccentric cam 20
The frame 8 to which the headrest body 10 is attached, that is, the headrest body 10, moves horizontally forward relative to the frame body 12 and the poles 14.14 due to the link action of the parallel links 17.17.

Incidentally, as the eccentric cam 20 rotates, the direction in which the plate member 22 is pushed changes from the rear direction to the upward direction, and as the plate member 22 moves toward the frame side axis through the elongated holes 24, 24 on the upper and lower sides. It moves upward while being guided by the member 25 and the frame-side shaft member 26.

On the other hand, when trying to move the headrest 6 rearward, on the other hand, by rotating the bundle 19 clockwise in FIG. In operation, the headrest body 10 is connected to the pole 14.14.
Move horizontally backwards relative to the object.

Therefore, by moving the headrest main body 10 back and forth in this way and stopping it at a desired position, the headrest 6 can be adjusted.
The front and rear positions are adjusted.

The eccentric cam 20 is closely inserted into the opening 23 of the plate member 22, and the upper and lower portions of the plate member 22 are connected to the frame 8 and the frame body 12, respectively, by the shaft member 2.
Since it is pivoted through 5.26, there is little backlash.
The position of the headrest main body 10 can be adjusted with high precision.

In addition, since the frame 8 is moved back and forth by the eccentric cam 20 via the plate member 22, the position of the headrest body 10 can be adjusted quietly and smoothly.
Moreover, the setting of the adjustment position can be changed steplessly.

Furthermore, since the eccentric cam 20 is rotated only by the operating force from the bundle 19 through the intervention of the friction clutch 21, the headrest main body 10 is not moved by external force, and the headrest 6 can be reliably brought to the stop position. In addition, when manufacturing such a device, the plate member 2
It is only necessary to drill an opening 23 and a long hole 24 through 2, which is extremely easy to process compared to the conventional process of forming an interlocking part, and the processability can be significantly improved.

4 and 5 show other embodiments; the same members as in FIGS. 2 and 3 are given the same reference numerals and detailed explanations are omitted). In this embodiment, the frame is 8′
A side wall 7' is located at the left and right center position inside.

Attaching the subframe 27 having a diameter of 7',
A fixing bracket 28 having side walls 11', 11' is attached to the frame 12' at a position corresponding to the sub-frame 27 (left and right center position), and a parallel link 17, Plate member 22
etc. are interposed.

Therefore, this embodiment can also achieve the same effect as the above embodiment, and in addition, the parallel links 1 on both the left and right sides
7.17 are arranged close to each other, the link function of both parallel links 17.17 can be made smooth, and the position adjustment can be performed even more smoothly. It is.

As explained above, according to the present invention, the headrest body includes a frame and a pad material surrounding the frame, a frame body located within the frame, and an upper end portion of which is fixed to the frame body. In an automobile headrest equipped with a pair of poles supported above the seat back, the left and right side walls of the frame body and the left and right side walls of the frame are connected by parallel links, and a bundle is attached to one side wall of the frame. An eccentric cam that is rotated via a friction clutch is provided, and a plate member is provided that has an opening through which the eccentric cam is inserted and has elongated holes extending in the vertical direction at the upper and lower portions, and the above-mentioned upper long By inserting and supporting the frame-side shaft member fixed to the side wall of the frame into the hole and the frame-side shaft member fixed to the side wall of the frame body into the lower elongated hole, and rotating the bundle,
By moving the headrest body horizontally and parallel to the pole to adjust its relative front and back position with the frame, play between the headrest body and the pole can be minimized, making it possible to The front and back position of the headrest can be adjusted accurately and smoothly.

It is extremely easy to make holes such as openings in the above-mentioned plate member by simply machining it, so it also has the advantage of greatly improving workability during manufacturing. .

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is an overall perspective view of an automobile seat, FIG. 2 is a longitudinal sectional front view showing one embodiment, and FIG. 3 is a sectional view taken along the line ■■ in FIG. 2. 4 and 5 show other embodiments, with FIG. 4 being a front view and FIG. 5 being a perspective view. 2... Seat back, 6,6'... Headrest,
7°7′... side! , 8 , 8'...frame, 9.
... Pad material, 10... Headrest body, 11,
11'...Side wall, 12.12...Frame body, 14...
Pole, 17... Parallel link, 19... Endle, 20... Eccentric cam, 21... Friction clutch, 22
... Plate member, 23 ... Opening, 24 ... Long hole, 2
5... Frame side shaft member, 26... Frame side shaft member, 27... Subframe, 28... Fixed bracket.

Claims (1)

[Scope of utility model registration request] a headrest body made of a frame and a pad material surrounding the frame; a frame body located within the frame; and a pair of poles whose upper ends are fixed to the frame body and support the headrest body at a position above the seat pack. The left and right side walls of the frame body and the left and right side walls of the frame are respectively connected by parallel links, and one side wall of the frame is provided with an eccentric that is rotated by a bundle via a friction clutch. While providing a cam, a plate member having an opening through which the eccentric cam is inserted and having elongated holes extending in the vertical direction at the upper and lower parts thereof is provided, and a frame side fixed to the side wall of the frame is provided in the upper elongated hole. By inserting the shaft member and the frame-side shaft member fixed to the side wall of the frame into the lower elongated hole for pivotal support, and rotating the bundle, the headless body can be moved horizontally parallel to the pole. A headrest longitudinal adjustment device for an automobile, characterized in that the longitudinal position relative to the frame body can be adjusted by adjusting the longitudinal position of the headrest relative to the frame body.