JPH0114219Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a headrest for a vehicle in which the height of the headrest is adjusted by vertically movably inserting the support rod of the headrest into a guide cylinder which is internally fixed in the seat bag. This invention relates to improvements in locking devices.

(Prior art and its problems) Conventionally, this type of headrest locking device includes:
It has been disclosed that an elastic member made of a leaf spring engages with a recess provided in the support rod of the headrest through a window hole in a guide tube through which the support rod of the headrest is inserted, thereby locking the headrest in a predetermined position (for example, Publication No. 50-22417). This is done by pushing the operating section that is integrally connected to the elastic member.
The structure is such that the engagement state of the headrest with respect to the support rod is released by pressing and bending the elastic member, and there is an advantage that the engagement state can be maintained by the elasticity of the elastic member as long as the operating portion is not pushed.

However, in this case, the elastic member must be fixed to a support member welded inside the seat bag separately from the guide tube through which the support rod of the headrest is inserted. As a result, the various parts constituting the locking device cannot be integrated into a unit, resulting in a problem that it is difficult to assemble the locking device into a seat bag. In addition, the guide tube is made of synthetic resin (the guide tube is made of hard synthetic resin from the viewpoints of moldability, slidability of the support rod, soundproofing, etc.), and is Since this load is received by the edge of the window hole of the guide tube through which the elastic member is inserted, there is a defect that the guide tube is easily damaged from the window hole.

In order to eliminate this problem, for example, as disclosed in Japanese Utility Model Application No. 54-184218, the locking device is made into a unit to improve the ease of attachment to the seat bag and at the same time simplify the structure of the locking device itself. There is something I did. This consists of a synthetic resin guide cylinder with a pair of slits in the vertical direction to form a lock part with a protrusion, and a protrusion that engages with the recess of the support rod of the headrest on the inner surface of the upper part of the lock part. This is a built-in structure. Therefore, as mentioned above, the structure of the locking device itself is simple and the installation to the seat bag is good, but as in the case where the leaf spring elastic member is used, the load applied to the support rod of the headrest is absorbed by the locking portion. Since the lock is supported only by the protrusion, the strength of the lock part is insufficient, resulting in a lack of durability.

Therefore, the present invention aims to eliminate such defects of conventional products. That is, it is an object of the present invention to provide a locking device which is made into a unit, which improves the ease of assembling the locking device itself, and which is also easy to attach to a seat bag and has excellent durability.

(Structure) The lock structure of the headrest according to the present invention to achieve the above object is fixed in the seat bag, has an upper edge protruding from the top surface of the seat bag, and has a square outer surface with a window hole in one side wall. a guide tube; a headrest support rod that is fitted into the guide tube so as to be vertically movable and has a recess for vertical adjustment of the headrest on the side facing the window hole of the guide tube; and a guide tube from the window hole of the guide tube. An elastic member made of a flat plate spring having a locking protrusion to be inserted into the cylinder on the upper side side; a through hole through which the locking protrusion of the elastic member is inserted; and an upper end protruding outside the seat back. an elastic release plate made of a flat plate spring and having an operation part for controlling the elastic release plate, the locking protrusion provided on the elastic member is inserted into the through hole of the elastic release plate, and the elastic member and the elastic release plate are connected to a guide. The lower ends of both members are superimposed on one side wall of the cylinder, with the elastic member outside, and the lower ends of both members are fixed to the guide cylinder, and the locking protrusion of the elastic member is connected to the support rod of the headrest from the window hole of the guide cylinder. It is characterized in that it engages with the recessed portion.

(Function) The locking protrusion of the elastic member passes through the hole in the elastic release plate and the window hole in the guide tube, and engages with the recess provided in the support rod of the headrest, thereby raising the headrest to a predetermined height. Retained. At this time, the vertical load applied to the support rod of the headrest is received by the locking protrusion, which is inserted through the through hole of the elastic release plate. Therefore, the locking protrusion is pressed by the load of the support rod and comes into contact with the hole edge of the through hole of the elastic release plate, so that the load is borne by the elastic release plate. The elastic release plate is held between the elastic members, is formed of a plate-shaped leaf spring together with the elastic members, and is fixed to one side wall of the guide cylinder together with the elastic members, so that it is not locked. It will not be deformed by the load from the protrusion.

When the operating section provided at the upper end of the elastic release plate is pushed or pulled against the elasticity of the elastic member, the elastic member moves using the distal end as a fulcrum, and the locking protrusion moves into the recess of the support rod. The locked state is released by escaping from the unit.

(Embodiment) Below, an embodiment of the present invention will be explained based on the drawings. In the figure, A is a headrest, a and a' are support rods of the headrest A, and one of the support rods a has a vertically extending A large number of recesses a ₁ , a _{1 .} . . for vertical adjustment of the headrest are drilled at predetermined intervals. Note that the vertical side walls a' ₁ , a _{' 1} of each of the recesses a ₁ , a ₁ are formed in an inclined shape (FIG. 3).

In this figure, both the upper and lower side walls of the concave portion _a1 and the locking protrusion 3 (to be described later) are formed in an inclined manner, and the locking protrusion 3 can be smoothly moved by the vertical movement of the headrest A.
can escape from the recessed part _a1 and lock off.

B in the figure is a seat bag, and an inverted U-shaped frame (not shown) is installed inside the seat bag B, and a bracket (not shown) is fixed to the top of the frame. is fixed to a guide tube 1 having a square outer surface and a cylindrical inner surface. The brim-shaped upper end edge 1b of this guide tube 1 is attached so as to be exposed from the top surface of the seat bag B, and the outer surface side of the guide tube 1 is provided with the concave portion a ₁ of the support rod a. window hole 1
A is opened, and an elastic member 2 provided with a pressure release plate 4 and a locking protrusion 3, which will be described later, is fixed to a side wall with a window hole 1a in a stacked manner with fixing pins 5, 5.

The pressure release plate 4 has a flat plate-like vertical portion 4b that joins without a gap along one side of the guide tube 1 where the window hole 1a is provided, and a horizontal portion that protrudes outward from the back side of the upper end edge 1b of the guide tube 1. It is composed of a leaf spring including an operating section 4a. A window hole 1 is provided at a position of this vertical portion 4b that engages with the window hole 1a of the guide tube 1.
A through hole 4c for inserting the locking protrusion 3, which is approximately the same shape as a, is opened, and the operating portion 4a is formed into a wing shape or annular shape so that the fingertip can be easily hooked, and the upper end edge 1b of the guide tube 1 is attached to the back side of the upper end edge 1b. It protrudes horizontally from the

The elastic member 2 is a plate-like leaf spring, and at the position where it engages with the through hole 4c of the elastic pressure release plate 4 inside the upper part,
A locking protrusion 3 that engages in the recessed part a ₁ of the support rod a is provided, and the locking protrusion 3 engages with the support rod a by the elasticity of the elastic member 2.
It is designed to make elastic contact with one side of the.

Note that the locking device shown in FIGS. 5 and 6 has an operating portion 4a' integrally provided on the top of the pressure release plate 4, and this operation portion 4a' is provided with a guide cylinder 1 on the top of the pressure release plate 4.
A mounting ring 6 having a larger diameter is provided, a pushing piece 7 is fixed to this mounting ring 6, and the mounting ring 6 is inserted into the upper part of the guide tube 1. Therefore, by pushing the pushing piece 7 with a fingertip in one direction along the guide passage against the elasticity of the elastic member 2, the engagement state of the locking protrusion 3 is released (locked off).

Hereinafter, to explain how the present invention is used, in order to adjust the height of the headrest A, the operating parts 4a and 4a' exposed at the top of the seat bag B are pulled or pushed with a fingertip against the elasticity of the elastic member 2. When you move it,
The locking protrusion 3 fixed to the elastic member 2 escapes from the recessed part _a1 of the support rod a and becomes in a lock-off state. Then, in this state, the user grasps the headrest A and moves it up and down to adjust the height of the headrest A to an appropriate position. After that, when you release your fingertips from the operating parts 4a, 4a', the elasticity of the elastic member 2 causes the locking protrusion 3 to
is resiliently engaged with the recessed portion _a1 of the support rod a, thereby restricting the upward and downward movement of the support rod a, resulting in a locked state. By making the shape of the concave portion a ₁ and the locking protrusion 3 as shown in the figure, when the headrest A is gripped in the locked state and forcefully moved up and down, the support rod a
The locking protrusion 3 engaged in the recessed part _a1 of the head rest A is moved upwardly and downwardly by the support rod a of the headrest _A.
Escape from inside (lock-off state). Note that since the pressure release plate 4 having the operating parts 4a and 4a' is a separate member from the elastic member 2 provided with the locking protrusion 3, the guide cylinder 1 is held in the lock-off state (FIG. 3) as well as in the locked state. It is attached to the outer surface without any gaps.

(Effects) Since the present invention is configured as described above, it has the following effects.

(1) Since the locking device can be formed by fixing an elastic member with a locking protrusion and an elastic release plate to the guide cylinder, the locking device can be made into a unit. Therefore, not only is it easy to assemble the lock device itself, but also it is not necessary to provide a part of the lock device on the seat back side in advance, so the lock device can be easily attached to the seat back side.

(2) The locking protrusion that engages with the concave part of the support rod is inserted into the hole in the elastic release plate that is superimposed on one side of the guide cylinder due to the elasticity of the elastic member, so that the The load applied to the stopper can be received by the hole edge of the through hole of the elastic release plate. Therefore, the guide tube is not damaged from its window hole by the locking protrusion. Further, the elastic release plate is overlapped with the elastic member on one side of the guide tube, and does not deform even when bearing the load of the locking protrusion, thereby improving durability.

(3) Both the elastic member and the elastic release plate are flat leaf springs, and are fixed to one side of the guide cylinder in an overlapping manner in the same direction as the vertical load applied to the support rod of the headrest. It is possible to effectively cope with the load applied to the locking protrusion.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view showing the seat bag attached to the seat bag, Fig. 2 is a longitudinal sectional front view of the main part of the seat bag to which the headrest is attached, and Fig. 3 shows the seat bag in the lock-off state. FIG. 4 is a partially cutaway plan view, FIG. 4 is an exploded perspective view, FIG. 5 is a partially cutaway front view of another embodiment in a locked state, and FIG. 6 is an exploded perspective view thereof. . In the figure, A is a headrest, B is a seat back, a, a' are support rods, _a1 is a recessed part, 1 is a guide tube, 2 is an elastic member, 3 is a locking protrusion, 4 is a pressure release plate, 4a, Reference numeral 4a' indicates an operating portion of the pressure release plate 4, respectively.

Claims (1)

[Scope of Claim for Utility Model Registration] A guide tube that is fixed within the seat bag and has an upper edge protruding outside from the top surface of the seat bag, and has a window hole in one side wall and has an angular outer surface, and is movable up and down within the guide tube. A support rod for the headrest has a recess for vertical adjustment of the headrest on the side facing the window hole of the guide tube, and a locking protrusion that is inserted into the guide tube from the window hole of the guide tube on the upper side. an elastic member made of a flat plate spring, having a through hole through which a locking protrusion of the elastic member is inserted, and an elastic release plate made of a flat plate spring having an operating portion protruding outside the seat back at its upper end. The locking protrusion provided on the elastic member is inserted into the through hole of the elastic release plate, and the elastic member and the elastic release plate are overlapped on one side wall of the guide tube, with the elastic member facing outside. The lower ends of both members are fixed to the guide cylinder, and the locking protrusion of the elastic member engages with the recess provided in the support rod of the headrest through the window hole of the guide cylinder. Locking device.