JPS61280808A - Movable headrest - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a hole that penetrates the seat in the front-rear direction and is adjustable in the front-rear direction by using a ratchet mechanism. This invention relates to an improvement in a perforated movable headrest provided in a.

(Prior Art) In general, vehicle seats etc.
It is desirable to hold the seated person stably, provide them with appropriate seating comfort, and reduce fatigue as much as possible even when seated for long periods of time. To this end, various support devices are installed in each part of the seat. be done. The most common type of support device is a headrest provided at the upper end of a seat pack so as to support the head of a seated person on the back surface of the seated person's head.

By the way, various configurations of such headrests have been known in the past. For example, a headrest supported by a headrest stay protruding from the upper end of a seat pack is provided so as to be movable in the front-rear direction of the seat. A front and rear position adjustable type is also well known. With such a movable headrest configuration, it is possible to further improve the feeling of the seated person.

In addition, in recent years, in this type of vehicle seat, the headrest used in the front seat is of the perforated type, which has a hole that penetrates the seat in the front and back direction at approximately the center. The hole allows the front field of view of passengers seated in the rear seats to be expanded.

Even in such perforated headrests, it has become desirable to adopt a configuration that allows for adjustment of the seat's movement in the longitudinal direction as described above.
For example, a movable headrest using a ratchet mechanism having a link structure has already been proposed in Japanese Utility Model Application Publication No. 59-174055.

(Problems to be Solved by the Invention) However, with the above-mentioned conventional movable headrest configuration, the configuration is complex and has a large number of parts, and not only is the manufacturing and assembly work cumbersome and complicated, but also the headrest can be moved. Since the ratchet mechanism for this purpose is located inside the side plate of the headrest, the amount of overhang of this mechanism increases, creating problems such as making it difficult to make the opening of the hole large. It was something.

In order to secure the opening amount of the hole described above, it is conceivable to arrange the ratchet mechanism outward.
In this case, the problem is how to handle the shock absorbing material that is integrally foamed on the outside of the headrest frame so as to eliminate problems such as the foam material flowing into the ratchet mechanism during molding.

In particular, when supporting this type of headrest in a movable manner, it is important to have a structure that is as simple as possible, yet superior in terms of operation and cost, and that also ensures that the movement of the headrest is controlled at the desired adjustment position. For example, it is desirable to be able to stably and firmly maintain the position of a seated person against the load when seated, and it is necessary to take some measures that take these points into consideration. is necessary.

The present invention was made in view of these circumstances, and
By adopting a ratchet mechanism with a simple configuration, the headrest can be adjusted smoothly and reliably in the longitudinal direction of the seat with a small amount of operating force at the upper end of the seat back. It can be locked easily and securely without any build-up, the hole size is sufficient, and the molding and assembly of each part can be done easily and appropriately, and the overall structure is small, lightweight, and compact. The object of the present invention is to obtain a perforated movable headrest that can be made more compact and lower in cost.

(Means for solving the problem) In order to meet such demands, the movable headrest according to the present invention has a lower frame shaft fixed to the tip of the headrest stay as a fixed side extending from the upper end of the seat back. , a movable base plate rotatably supported by both ends of the frame shaft, and an upper frame connecting the distal ends of both base plates, and the lower frame shaft on the fixed side and the base plate on the movable side can be selectively connected to each other. A ratchet mechanism for locking is provided on at least one side of the base plate, and a cover body is assembled and fixed onto the base plate so as to cover the ratchet mechanism.

(Function) According to the present invention, the unit structure consisting of the base plate containing the ratchet mechanism part and the cover body allows the unit structure to be made smaller and more compact, and the ratchet mechanism is not attached even when the foam material is molded on the outside of the unit structure. There is no problem and the molding process and assembly work can be performed easily and appropriately.

(Example) Hereinafter, the present invention will be explained in detail using an example shown in the drawings.

Figures 1 to 3 show an embodiment of a perforated movable headrest according to the present invention. In these figures, the perforated headrest designated by reference numeral 1 has a movable headrest located approximately at the center of the seat. It has a hole 2 penetrating in the direction, and headrest stays 3, 3 are integrally provided below the hole 2. Here, 4 in the figure is a cushioning material (foam) that is integrally molded with a foamable synthetic resin material that is injected inside a skin material (not shown).

Now, according to the present invention, as described above, in the perforated movable headrest 1 which has the hole 2 penetrating the seat in the front-rear direction and is provided at approximately the center thereof and is provided so as to be movable and adjustable in the front-rear direction of the seat. , a headrest stay 3, 3 as a fixed side extending from the upper end of the seat back (not shown).
A lower frame shaft 10 fixed to the tip, movable base plates 11, 11 rotatably supported at both ends of the frame shaft 10, and a downward-facing plate connecting the tip sides of these base plates 11, 11. and an upper frame 12 exhibiting a letter shape, the base brake) 11
．． 11 is provided with a ratchet 13 having a plurality of teeth 13a along the front-rear direction of the seat, and a side plate 15 having a claw 14 that selectively engages with the ratchet teeth 13a. The cover body 16 is fixed on the end 10a of the frame shaft IO, and the cover body 16 is fixed on the base brake (11.11) so as to cover these ratchet mechanism parts (13, 14, 15). It is characterized by being configured as a neat structure (17).

According to such a configuration, the ratchet mechanism section (
The ratchet mechanism unit 17, which is composed of the base plate 1-1 and the cover body 16, which incorporates the ratchet mechanism unit (13, 14), can be made smaller and more compact.
13 and 14), there is no problem and it is possible to perform simple and appropriate molding and assembly operations.

Therefore, in the configuration according to the present invention as described above, the headrest 1 can be smoothly and reliably adjusted in the longitudinal direction of the seat with a small operating force at the upper end of the seat pack. ,
It can be locked easily and securely without rattling, the hole part 2 is of sufficient size, and the molding and assembly of each part can be done easily and appropriately, and the overall structure is small and lightweight. Moreover, compactness and cost reduction can be achieved.

Here, a second ratchet mechanism (13, 14) that rotatably supports the heel 7 dress 1 as described above about the frame shaft 10 and can adjust the inclination angle to any desired angle is provided.
To briefly explain using FIG. 3 and FIG. 3, the claw portion 1
4 is supported on the side plate 15 by a shaft portion 21 guided by an arcuate guide groove 20, and is configured to be able to engage with a cam plate 22 provided on the movable side.

A spring 23 stretched between the pawl portion 14 and the cam plate 22 normally causes the pawl portion 14 to engage the ratchet tooth portion 1.
3a, but when the headrest 1 is rotated to the frontmost position F of the seat, this spring 23 overcomes the frame 10, which is the rotational fulcrum of the cam plate 22, and moves in the direction of disengaging the cam plate 22. It is configured to be biased.

Furthermore, when the headrest 1 is returned to the rearmost position in this state, the pawl portion 14 engages with the cam plate 22 and returns to a state in which it can mesh with the ratchet/tooth portion 13a. The meshing state of the ratchet is sequentially conveyed by the action of the ratchet. In addition, 24 in the figure is a return spring that biases the entire headrest 1 rearward.

Therefore, according to such a ratchet mechanism, the locked state can be released by rotating the headrest 1 toward the frontmost side of the seat, and the position can be changed by sequentially moving the headrest 1 from the rear end in a ratchet manner. It can be adjusted.

Further, in the ratchet mechanism section having the above-described configuration,
The meshing state between the ratchet tooth portion 13a and the pawl portion 14 is
There is a risk that problems such as disengagement may occur due to vibrations, shocks, etc., but as shown in FIG.
6. Attachment can be easily solved by attaching using the flange lla. Such a plate 30 can also be effective in increasing the strength of the ratchet mechanism unit 17 and preventing deformation of the cover body 16 and the like due to impact force.

Furthermore, in the configuration of the embodiment described above, after the cushioning material 4 is foam-molded, shaping treatment such as cutting out the cushioning material 4 is not necessary. To explain this simply, the tips of the stays 3, 3 are fixed to the frame shirt 10 by welding or the like. In addition, the ratchet mechanism unit 17 configured as a unit as described above is designed to prevent the foam material from entering when these headrest frame components (10, 11, 12) are inserted into the mold. It has a closed structure.

In such a configuration, the frame shaft 1
By setting the distance between 0 and the lower end of the headrest 1 as small as possible, the headrest 1 can be used as a movable headrest after molding, and the distance between Cushioning material 4
This method does not require troublesome post-processing such as excision.

That is, as shown in FIGS. 5(a) and 5(b), when the headrest 1 is rotated after molding, the frame shaft 10 as an axis and the cushioning material 4 around it are naturally separated, and as shown in FIG. A hollow portion as shown in center A can be obtained. In addition, near the north ends of the stays 3, 3, the buffer material 4 is affected by the rotational movement to some extent, but one side is only compressed and the other is expanded, so it does not particularly impede the above-mentioned rotational movement. do not have. Note that B in Figure 1 indicates a portion of the cushioning material around the frame shaft 10 as an axis.

Of course, if the distance of the frame shaft 10 from the lower end of the headrest 1 cannot be shortened, the compression and expansion of the cushioning material 4 as described above cannot be ignored, but in this case, as shown in FIG. A concave portion 40 may be formed on the lower end side of the stay 4 to eliminate interference between the stays 3, 3 and the cushioning material 4.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape and structure of each part may be modified or changed as necessary. For example, a ratchet mechanism (13° 14 ) does not necessarily have to be provided on both sides, and may be provided only on one side.
Furthermore, the ratchet 13 and the claw portion 14 may be formed on opposite sides.

(Effects of the Invention) As explained above, according to the perforated movable headrest according to the present invention, the frame shaft is fixed to the tip of the headrest stay extending from the upper end of the seat back as a fixed side. and a base plate on the movable side rotatably supported by both ends of the frame shaft, and an upper frame connecting the distal ends of both paceblades, the lower frame shaft on the fixed side and the base plate on the movable side. A ratchet mechanism for selectively locking is provided on at least one side of the base plate, and the cover body is assembled and fixed onto the base plate so as to cover these ratchet mechanism parts, resulting in a simple and inexpensive structure. Despite this, the headrest can be adjusted smoothly and reliably in the front and rear directions of the seat with a small amount of operating force at the upper end of the seat back, and the headrest can be easily and reliably moved in the adjusted position without wobbling. It can be locked securely, the holes are large enough to function as a perforated headrest, and the molding and assembly of each part can be done easily and appropriately. There are various excellent effects such as overall miniaturization, light weight, compactness, and cost reduction.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing one embodiment of a perforated movable headrest according to the present invention, Figs. 2 and 3 are front and side views showing the main structure thereof, and Fig. 84 is a modification thereof. FIGS. 5(a) and 5(b) are explanatory diagrams showing the relationship between the headrest frame and the cushioning material, and FIG. 6 is a diagram showing a modification thereof. In the figure, 1... to the perforated movable dress rest, 2...
Hole portion, 3... Headrest stay, 4... Cushioning material made of foam material, 10... Lower frame shaft, 11.
... Base plate, 12 ... Upper frame, 13.
...Ratchet, 13a...teeth part, 14...claw part,
15... Side plate, 16... Cover body, 1
7... Ratchet mechanism unit.

Claims (1)

[Claims] A perforated movable headrest that has a hole that penetrates the seat in the front-rear direction and is provided at approximately the center so that it can be moved and adjusted in the front-rear direction of the seat, and the fixed side extends from the upper end of the seat back. A lower frame shaft fixed to the tip of the headrest stay, a movable base plate rotatably supported at both ends of the frame shaft, and an upper frame connecting the tip sides of both base plates. A ratchet mechanism for selectively locking the lower frame shaft on the side and the base plate on the movable side is provided on at least one side of the base plate, and a cover body is assembled and fixed on the base plate so as to cover these ratchet mechanism parts. A movable headrest.