JPH0536047B2 - - Google Patents

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 head rest provided in a.

(Prior Art) Vehicle seats generally have a head rest provided at the upper end of the seat back so as to support the head of a seated person on the back surface of the seat. Incidentally, 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 the seat bag 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, regarding this type of vehicle seat,
A perforated type headrest used in front seats has also been proposed, in which a hole is provided approximately in the center of the seat in the front-rear direction. It is possible to expand the forward field of view of passengers seated in the seats.
It has become desirable to adopt such a perforated headrest with a structure that allows for adjustment of the movement of the seat in the longitudinal direction as described above. A movable headrest using a ratchet mechanism having a link structure, and Utility Model No. 59
As shown in Japanese Patent No. 187355, a front and rear movable headrest using a ratchet mechanism has already been proposed.

(Problems to be Solved by the Invention) However, the above-mentioned conventional movable headrest structure is not only complicated and has a large number of parts, making manufacturing and assembly work cumbersome and complicated, but also because it is difficult to move the headrest. Since the ratchet mechanism is disposed inside the side plate of the headrest, the amount of overhang of this mechanism becomes large, which causes problems such as making it difficult to make the opening amount of the hole large. It was hot.

In order to secure the above-mentioned opening amount of the hole, it is conceivable to arrange the ratchet mechanism outward, but in this case, the foam that is integrally formed on the outside of the headrest frame may be used. The problem is how to handle the foam material in a way that can 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, the problem is 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. It would be desirable to be able to stop the

The present invention has been made in view of these circumstances, and by adopting a ratchet mechanism with a simple configuration, the headrest can be smoothly and reliably moved in the longitudinal direction of the seat with a small operating force at the upper end of the seatback. It can be adjusted, and the headrest can be easily and reliably locked in the adjusted position without rattling.The hole is also large enough, and the molding process of each part, especially the foaming The object of the present invention is to provide a perforated movable headrest that allows foam molding and assembly of the body to be performed easily and appropriately, and also achieves overall miniaturization, lightness, compactness, and cost reduction.

(Means for Solving the Problem) In order to meet such demands, the movable head rest according to the present invention includes a lower frame shaft fixed to the tip of the head rest stay, and a rotatable portion at both ends of the lower frame shaft. A headrest frame component consisting of a movable base plate supported by a movable base plate, an upper frame connecting the distal ends of both base plates, and a cover body assembled and fixed to form a sealed space outside the base plate. A ratchet mechanism is provided in a sealed space formed by the base plate and the cover body, and the ratchet mechanism includes a ratchet having a plurality of ratchet teeth fixed to the base plate, and a ratchet mechanism that is selectively attached to the ratchet teeth. and a side plate that pivotally supports the claw portion and is fixed to both ends of the lower frame shaft, wherein both ends of the lower frame shaft on the fixed side and a base plate on the movable side. The headrest frame is configured to be selectively locked by the ratchet mechanism, and a foam is molded integrally with the headrest frame constituent members and the ratchet mechanism.

(Function) According to the present invention, the closed unit structure consisting of the base plate with a built-in ratchet mechanism and the cover body allows it to be made smaller and more compact, and also when molding the foam on the outside. There is no problem with the ratchet mechanism, and molding and assembly operations can be performed easily and appropriately.

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

1 to 3 show an embodiment of a perforated movable headrest according to the present invention,
In these figures, a perforated head rest indicated by reference numeral 1 has a hole 2 that penetrates in the front-rear direction of the seat approximately in the center thereof, and head rest stays 3, 3 are integrally provided below the hole 2. ing. Here, reference numeral 4 in the figure is a foam body integrally molded with a foamed synthetic resin material injected into the inside of a skin material (not shown).

According to the present invention, in a perforated movable headrest 1 which has a hole 2 penetrating the seat in the front-rear direction and is provided at approximately the center thereof so as to be movable and adjustable in the front-rear direction of the seat, the seat back (see FIG. (not shown) A lower frame shaft 10 fixed to the tips of head rest stays 3, 3 as fixed sides extending from the upper end, and this lower frame shaft 1
movable base plates 11, 11 rotatably supported at both ends of the base plates 11, 11; It includes a headrest frame component consisting of a cover body 16 that is assembled and fixed so as to form a sealed space on the outside.

The base plates 11, 11 and the cover body 1
A ratchet mechanism 17 is provided within the closed space formed by the ratchet mechanism 6. Said ratchet mechanism 1
Reference numeral 7 denotes a ratchet 13 having a plurality of teeth 13a along the front-rear direction of the sheets of the base plates 11, 11, a pawl 14 that selectively engages with the ratchet teeth 13a, and a pawl 14 that supports the pawl 14. It has a side plate 15, which side plate 15 is attached to both ends 1 of the lower frame shaft 10.
The cover body 16 is fixed on the base plate 1 and covers the ratchet mechanisms 17 from the outside to form a sealed space.
It is constructed as a unit structure that is assembled and fixed on 1 and 11.

According to this configuration, the closed unit structure consisting of the base plate 11 with the built-in ratchet mechanism 17 and the cover body 16 can be made smaller and more compact, and the foam body 4 on the outside thereof can be made smaller and more compact. There is no problem with the ratchet mechanism 17 during molding, and the molding and assembly operations can be performed easily and appropriately.

Therefore, with the configuration according to the present invention as described above, the headrest 1 can be adjusted to move smoothly and reliably in the longitudinal direction of the seat with a small operating force at the upper end of the seatback, and moreover, the headrest 1 can be moved at the adjusted position. can be easily and reliably locked without rattling, and the size of the hole 2 is sufficient, and the molding and assembly of each part can be done easily and appropriately, and the overall size is small. , it is possible to achieve reductions in weight, size, and cost.

Here, the ratchet mechanism 17, which supports the headrest 1 as described above rotatably around both ends 10a of the lower frame shaft 10 and can adjust it to any inclination angle, will be explained briefly using FIGS. 2 and 3. To explain, the claw portion 14 is supported on the side plate 15 by a shaft portion 21 guided by an arcuate guide groove 20, and is configured to be engageable with a cam plate 22 provided on the movable side. There is.
A spring 23 stretched between the pawls 14 and the cam plate 22 normally biases the pawls 14 so as to mesh with the ratchet teeth 13a, but the headrest 1 is moved to the frontmost position F of the seat. When rotated, this spring 23 is configured to be able to overcome the lower frame shaft 10, which is the rotational fulcrum of the cam plate 22, and bias it in the direction of disengaging the cam plate 22.

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, thereby sequentially moving toward the front of the seat. The meshing states are sequentially conveyed through a ratchet operation. In the figure, reference numeral 24 denotes a return spring that urges the entire headrest 1 rearward.

Therefore, according to such a ratchet mechanism 17, by rotating the headrest 1 toward the frontmost side of the seat, the locked state can be released, and
Its position can be adjusted by sequentially moving it in a ratchet manner starting from the rear end.

In addition, the ratchet tooth portion 1 of the ratchet mechanism 17
There is a risk that the meshing state between the claw portion 3a and the claw portion 14 may become disengaged due to vibrations, shocks, etc. This can be easily solved by attaching the cover body 16 to the base plate 11 using the flange 11a for attaching it. Such a plate 30 is also effective in increasing the strength of the ratchet mechanism 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 foam 4 is foam-molded, there is no need to cut off the foam 4 or unprocess the edges. To explain this simply, the tips of the stays 3, 3 are fixed to both ends 10a of the lower frame shaft 10 by welding or the like. Further, as described above, the unit structure ratchet mechanism 17 includes a base plate having a sealed structure to the extent that the foamed synthetic resin material can be prevented from entering when the headrest frame component is inserted into the mold. 1
1 and the cover body 16.

In such a configuration, if the distance between the lower frame shaft 10 and the lower end of the head rest 1 is set to be as small as possible, the head rest 1 can be used as it is as a movable head rest after molding. , it does not require troublesome post-processing such as cutting off the foam 4 as seen in conventional products. That is, as shown in FIGS. 5a and 5b, when the headrest 1 is rotated after molding, the lower frame shaft 10 as an axis and the foam body 4 around it
It peels off naturally, and a hollow part as shown by A in the figure can be obtained. In addition, near the upper ends of the stays 3, 3, the foam 4 is somewhat affected by the rotational movement, but one is only compressed and the other is expanded, and this does not particularly impede the above-mentioned rotational movement. do not have. Note that B in the figure indicates a foam portion around the lower frame shaft 10 as an axis.

Of course, if the distance of the lower frame shaft 10 from the lower end of the headrest 1 cannot be shortened, the compression and expansion of the foam 4 as described above cannot be ignored, but in this case, as shown in FIG. A concave portion 40 may be provided on the lower end side of the body 4 to eliminate interference between the stays 3 and the foam body 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, the ratchet mechanism 17 that locks the headrest 1 may be
It does not necessarily have to be provided on both sides, but may be provided only on one side, or 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 head rest according to the present invention, the lower frame shaft fixed to the tip of the head rest stay and both ends of the lower frame shaft can be rotated. a supported movable base plate; an upper frame connecting the distal ends of both base plates;
A headrest frame component is provided, comprising a cover body assembled and fixed to the outside of the base plate to form a sealed space, and a ratchet mechanism is provided in the sealed space formed by the base plate and the cover body. , the ratchet mechanism includes a ratchet having a plurality of ratchet teeth fixed to the base plate, a pawl that selectively engages with the ratchet teeth, a pawl that pivotally supports the pawl, and both ends of the lower frame shaft. and a side plate fixed to the lower frame shaft, and is configured to selectively lock both ends of the lower frame shaft on the fixed side and the base plate on the movable side by the ratchet mechanism, and the headrest frame component and Since the foam is molded integrally with the ratchet mechanism, the closed unit structure consisting of the base plate with the ratchet mechanism built in and the cover body allows it to be made smaller and more compact. There is no problem with the ratchet mechanism even when molding the seat back, and the headrest can be easily and appropriately molded and assembled.Despite its simple and inexpensive structure, the headrest can be moved to the upper end of the seat back with a small operating force. The headrest can be adjusted smoothly and reliably in the front-back direction, and the headrest can be easily and securely locked in the adjusted position without wobbling, and the hole is also large enough. , which can function as a perforated headrest.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing one embodiment of a perforated movable head rest according to the present invention, Figs. 2 and 3 are front and side views showing the main part configuration, and Fig. 4 is a modification thereof. An exploded perspective view showing an example, FIG. 5a,
b is an explanatory diagram showing the relationship between the headrest frame and the foam, and FIG. 6 is a diagram showing a modification thereof. In the figure, 1...perforated movable headrest, 2...
... Hole, 3 ... Head rest stay, 4 ... Foam, 10 ... Lower frame shaft, 11 ... Base plate, 12 ... Upper frame, 13 ...
Ratchet, 13a... Ratchet teeth, 14...
...Claw portion, 15...Side plate, 16...Cover body, 17...Ratchet mechanism.

Claims (1)

[Claims] 1. A perforated movable head rest having a hole penetrating the seat in the front-rear direction and provided at approximately the center thereof so as to be movable and adjustable in the front-rear direction of the seat,
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 side base plate rotatably supported at both ends of this lower frame shaft, and a movable side base plate that is rotatably supported on both ends of the lower frame shaft. A headrest frame component comprising an upper frame connecting the distal end sides and a cover body assembled and fixed to the outside of the base plate to form a sealed space, the headrest frame being formed by the base plate and the cover body. A ratchet mechanism is provided in the sealed space, and the ratchet mechanism includes a ratchet having a plurality of ratchet teeth fixed to the base plate, a pawl that selectively engages with the ratchet teeth, and a pivot supporting the pawl. and side plates fixed to both ends of the lower frame shaft, and configured to selectively lock both ends of the lower frame shaft on the fixed side and the base plate on the movable side by the ratchet mechanism. Additionally, a movable headrest characterized in that a foam is molded integrally with the headrest frame constituent members and the ratchet mechanism.