JPH068752Y2 - Headrest locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a headrest locking device, which is useful when applied to a device in which the position of the headrest with respect to the seat back of the seat can be adjusted in the vertical direction.

<Prior Art> FIGS. 6 to 13 show a headrest locking device according to the prior art.
Shown in the figure. In these figures, 1 is a back frame provided inside the backrest of the seat.
The cylinder 2 is fixed to the top of the cylinder 2, and a cut groove 2a is formed in the upper end of the cylinder 2. On the other hand, 3 is a headrest, and two headrest support rods 4 are fixed to the lower surface of the headrest 3, and a plurality of notches 4a are formed on the side surface of one of the support rods 4.

Reference numeral 5 denotes a support member that is inserted into and attached to the tubular body 2 of the back frame 1 and is integrally formed in a tubular shape from synthetic resin. A substantially circular flange 6 and a tongue piece 7 projecting outward from the flange are provided at the upper end of the support member 5.
A slit 9 at the upper end reaching the central hole 8 is horizontally formed between the flange 6 and the tongue piece 7. A stopper 10 is provided on the inner surface of the slit 9 as shown in FIGS. 8 and 10. A slit 11 at the lower horizontal end reaching the central hole 8 is formed in the lower part of the peripheral surface of the support member 5, and a vertical groove 12 connecting the slits 9 and 11 is formed between the slits 9 and 11. There is. On the upper outer peripheral surface of the support member 5, the cut groove 2a of the cylindrical body 2 is formed.
A protrusion 13 that engages with the to prevent the support member 5 from rotating, and a claw 14 that is locked to the lower edge of the tubular body 2 is provided at the lower end portion.

Reference numeral 15 is a stop spring made of a single spring wire, which has a knob 16 at the tip of a horizontal upper end 15a, a central part 15b is vertical, and a lower end 15c is bent horizontally. The locking spring 15 has an upper end portion 15a, a central portion 15b, and a lower end portion 1
5c are the slit 9 and the vertical groove 12 of the support member 5, respectively.
And the slit 11 and the tab 16 is the tongue piece 7.
Is located on the upper surface of. The locking spring 15 is
As shown in the figure, it is rotatable about a central portion 15b fitted in the vertical groove 12, and the rotation angle is regulated by a stopper 10 provided on the inner surface of the slit 9.

Next, the headrest locking device having the above structure will be described.

First, with the locking spring 15 fitted in the slits 9 and 11 and the vertical groove 12 of the support member 5 as shown in FIG.
When the support member 5 is inserted into the tubular body 2, the support member 5
The projection 13 is engaged with the cut groove 2a to prevent rotation, and the claw 14 is locked to the lower edge of the cylindrical body 2 to prevent it from coming off. At this time, the locking spring 15 is connected to the support member 5 and the tubular body 2.
It doesn't fall off because it is sandwiched between.

Next, as shown in FIG. 7, when the headrest support rod 4 is inserted into the central hole 8 of the support member 5, the tip taper 4b of the headrest support rod 4 causes the lower end portion 15 of the locking spring 15 to move.
c is pushed outward (in the direction of arrow A in FIG. 9 and FIG. 13), whereby the upper end portion 15a of the locking spring 15 pivots inward and comes into pressure contact with the peripheral surface of the headrest support rod 4. At this time, the upper and lower ends 15a and 15c of the locking spring 15 are in a state of being opened from their natural positions. Further, when the headrest support rod 4 is inserted to a position where the notch 4a and the upper end 15a of the locking spring 15 correspond to each other, the upper end 15a of the locking spring 15 is fitted into the notch 4a by its own spring force (see FIG. 9). The state of the middle dashed line), the headrest support rod 4 is locked.

Further, when changing the protruding length of the headrest support rod 4 from the support member 5, that is, the height of the headrest 3, the knob 16 of the locking spring 15 is moved in the direction of arrow B in FIG. The upper end 15a is removed from the notch 4a of the headrest support rod 4. In this state, the headrest support rod 4 can move up and down, and when pushed to a predetermined position, the upper end portion 15a of the locking spring 15 fits into the notch 4a again, and the headrest support rod 4 is locked at this position.

As described above, in the above-mentioned conventional technique, the upper end portion 15 of the locking spring 15 is
Both a and b (see FIG. 13) of the lower end portion 15b are in pressure contact with the peripheral surface of the headrest support rod 4 to lock the headrest support rod 4.

<Problems to be Solved by the Invention> As described above, in the prior art, both a and b portions of the locking spring 15 are in pressure contact with the headrest support rod 4, so that the headrest support rod 4 is provided with the central hole 8. Friction when inserting into the headrest and when changing the height of the headrest 3,
Not only does the operation of the headrest 3 associated with these operations become heavy, but there is also a problem that when the headrest support rod 4 is pulled out, the restricting force on the locking spring 15 is lost and backlash occurs.

SUMMARY OF THE INVENTION In view of the above problems of the prior art, it is an object of the present invention to provide a headrest locking device in which an operating force for moving a headrest is reduced and a rattling does not occur even when a headrest support rod is pulled out. And

<Means for Solving the Problems> The structure of the present invention that achieves the above-mentioned object is a cylindrical body that is fixed to the back frame at the top of the backrest of the seat and opens upward, and a vertical groove that extends in the vertical direction. And a cylindrical member in which a slit at the upper end and a horizontal groove at the lower end, which extend horizontally from the upper and lower ends of the vertical groove and extend continuously to the vertical groove, are engraved on the peripheral surface, and are inserted into the cylindrical body from above. A support member to be attached, one end of which is fixed to the headrest and the other end of which is inserted into a central hole of the support member, and which has a notch in the insertion portion, the slit, the vertical groove, and the horizontal The shape along the groove is fitted into them, and the portion along the slit projects from the slit into the central hole and can be engaged with the notch of the headrest support rod, and the tip thereof. To An outwardly projecting knob portion is provided, and a locking spring formed of a single spring wire rod is formed so that a portion along the vertical groove and the horizontal groove is located between the support member and the cylindrical body. Is characterized by.

<Operation> According to the present invention having the above-described structure, only the upper end of the locking spring is pressed against the headrest support rod, and the lower end thereof is pressed against the inner peripheral surface of the tubular body.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to FIGS.

In FIGS. 1 to 5, the same parts as those of the prior art are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIGS. 1 to 5, the support member 25 in this embodiment is different from the support member 5 of the prior art in that a horizontal groove 31 is formed instead of the slit 11. The horizontal groove 31 is continuously formed from the lower end of the vertical groove 12 along the peripheral surface of the support member 25 and is horizontally engraved in the vertical groove 12 in the same direction as the slit 9. Along with this, the locking spring 35
The shape of is also different. That is, the lower end portion 3 of the locking spring 35
5c is bent in the horizontal direction from the lower end of the central portion 15b according to the shape of the horizontal groove 31. Thus, the locking spring 35 is fitted and fixed to the tubular body 2 together with the support member 25 while being fitted in the slit 9, the vertical groove 12 and the horizontal groove 31. That is, the locking spring 35 in this state is fixed between the support member 25 and the tubular body 2 with the upper end portion 15a thereof facing the central hole 8 through the slit 9.

According to this embodiment, when the headrest support rod 4 is inserted into the central hole 8, it abuts on the upper end portion 15a of the locking spring 35 and moves the upper end portion 15a in the direction B in FIG. As a result, the upper end portion 15a is pressed against the headrest support rod 4 by its reaction force, and the lower end portion 35c is pressed against the inner peripheral surface of the tubular body 2. That is, the locking spring 35 is pressed into contact with the headrest support rod 4 only through one location (a portion in FIG. 5) of the upper end portion 15a. From this state, headrest support rod 4
Is further inserted into the central hole 8, the upper end 15 of the locking spring 35
The notch 4a faces the a, and the upper end portion 15a enters the notch 4a to lock the headrest support rod 4.

<Effects of the Invention> As described in detail in connection with the above embodiments, according to the present invention, one portion of the locking spring is brought into pressure contact with the headrest support rod. The power is small, and the headrest can be easily attached and the height can be changed.

Further, since the locking spring is fixed between the support member and the cylindrical body, the locking spring does not rattle even when the headrest support rod is pulled out.

[Brief description of drawings]

1 is a front view of a support member having a locking spring according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along the line I--I of FIG. 1, and FIG. 1 is a sectional view taken along line II-II of FIG. 1, FIG. 5 is a perspective view of a locking spring, FIG. 6 is an overall perspective view of a headrest locking device according to the prior art, and FIG. 8 is a front view of a support member having a locking spring according to the prior art, FIG. 9 is a plan view, FIG. 10 is a partial sectional view taken along the line VV of FIG. 9, and FIG. 11 is of FIG. VI-
A sectional view taken along line VI, FIG. 12 is a sectional view taken along line VII-VII in FIG. 8, and FIG. 13 is a perspective view of the locking spring. In the drawings, 1 is a back frame, 2 is a cylinder, 3 is a headrest, 4 is a headrest support rod, 4a notch, 8 is a central hole, 9 is a slit, 12 is a vertical groove, 15a is an upper end portion, and 15b is a central portion. Reference numeral 16 is a knob portion, 25 is a support member, 31 is a horizontal groove, 35 is a locking spring, and 35c is a lower end portion.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical body fixed to a back frame at the top of a backrest of a seat and opened upward, a vertical groove extending in the vertical direction, and a horizontal groove continuously extending from the upper and lower ends of the vertical groove to the vertical groove. A cylindrical member having a slit on the upper end and a horizontal groove on the lower end, which are respectively extended on the peripheral surface, are engraved on the peripheral surface.The support member is inserted into the cylindrical member from above, and one end is fixed to the headrest. An end portion is inserted into the central hole of the support member, and a headrest support rod having a notch in the insertion portion, and the slit, the vertical groove and a shape along the horizontal groove, and fitted to these, A portion along the slit projects into the central hole from the slit and is engageable with the notch of the headrest support rod, and further, a knob portion protruding outward is provided at the tip thereof, and the vertical groove and Headrest locking device portion along a flat groove and having a locking spring made of a single spring wire and shaped to come between the tubular body and the support member.