JPH04193109A - Headrest vertical adjusting device for seat - Google Patents

Abstract

PURPOSE:To easily adjust height by providing a lock releasing member which can be moved along the outer face of a stay and separates a lock member from a hooking notch at the time of a shift action, and fitting an interlocking system transferring the operating force of a lock release action knob to a lock releasing member. CONSTITUTION:When a headrest 19 is gripped with both hands or a hand and pulled upward from the state fixed at the upper end section of a seat back 18, a lock plate 23 is removed from a hooking notch 27 against the spring force of a spring 24 by the action of a slant face, a stay 25 is moved upward, and the headrest 19 is moved upward. When a lock release action knob 36 is pressed, a middle link 32 is rotated counterclockwise centering on a shaft 33, a lock release plate 28 is rotated counterclockwise, and the lock release plate 28 separates the lock plate 23 from the hooking notch 27 against the spring force of the spring 24. When the headrest 19 is gripped with both hands and pressed downward, the headrest 19 is displaced downward.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention enables the height of the headrest to be adjusted by engaging a locking member on the seat back side with one of a plurality of locking notches provided in the stay of the headrest. This invention relates to a seat headrest vertical adjustment device that adjusts the headrest of the seat.

(Prior art) As a headrest vertical adjustment device for this type of seat,
As shown in FIG. 14, a cylindrical guide 2 as shown in FIG. 15 is fixed to a frame (not shown) of the seat back 1,
A notch 3 is provided in this cylindrical guide 2, and a linear locking spring 4 is engaged with this notch 3, and a plurality of locking notches 7 are provided in one of the pair of stays 6 of the headrest 5 at intervals vertically. It has been considered that the stay 6 is fitted into the cylindrical guide 2 and the linear locking spring 4 is engaged with one of the plurality of locking notches 7 of the stay 6. In addition, the locking notch 7
It is formed into a figure 7 shape with slopes 7m and 7b provided above and below.

Therefore, when the headrest 5 is pulled or pressed vertically with a force greater than a predetermined value, the stay 6 moves to the inclined surface 7a.

7b, it is moved up and down against the spring force of the linear locking spring 4, and the mounting height of the headrest 5 is adjusted up and down.

In addition, as a headrest vertical adjustment device for other seats, a case 8 is fixed to the upper end of the seat back 1 as shown in FIG. 16, and a lock plate 9 is attached to the case 8 as shown in FIG. The intermediate side portion of the lock plate 9 is rotatably mounted on a pivot 10, and the base side of the lock plate 9 is rotatably biased upward by a spring 11, and a plurality of locking notches 12 are inserted into the headrest 5 as shown in FIG. It has also been considered that one of a pair of stays 6 is provided with an interval in the vertical direction, and the tip end 9a of the lock plate 9 is engaged with the stay 6 by the spring force of a spring 11. This locking notch 12 is formed by an upper stop surface 1 provided perpendicularly to the axis of the stay 6.
2a and a lower sloped surface 12b in a sawtooth shape.

In this configuration, by pulling the headrest 5 upward, the distal end 9a of the lock plate 9 resists the spring force of the spring 11 due to the action of the inclined surface 12b, and the locking notch 1
2, the stay 6 is displaced upward, and the height of the headrest 5 is adjusted. but,
When the headrest 5 is pressed downward, the distal end 9a of the lock plate 9 is prevented from being removed from the locking notch 12 while being engaged with the locking surface 12a. Therefore, by pressing the lock release knob 13 of the lock plate 9 and removing the tip 9a from the locking notch 12, the stay 6 is displaced downward and the headrest 5 is adjusted downward.

Further, as another example of the seat headrest vertical adjustment device, see Fig. 19 (see Japanese Utility Model Publication No. 1983-38911).
As shown in , the stay 6 is attached to the side of the headrest 50 facing downward, and this stay 6 is inserted into the cylindrical guide 2 on the seat back 1 side, and a spring-made "flap" is attached to this cylindrical guide 2. The base of the locking piece 14 in the shape of a square is fixed, the bent part 14a of this locking piece 14 is engaged with the locking notch 15 of the stay 6, and the locking piece 14 is attached to the side of the seat back 1. Some devices are provided so that the lock can be released using a lock release knob 16 that protrudes from the top.

In this configuration, by pulling the headrest 5 upward, the stay 6 is moved upward and the locking piece 14 is removed from the locking notch 15. Further, by pulling the lock release knob 16 to release the engagement of the locking piece 14 with the locking notch 15, the headrest 5 can be displaced downward.

(Problem to be solved by the invention) However, in the case shown in FIGS. 14 and 15,
In order to support the weight of the headrest 5, it is necessary to increase the spring force of the locking spring 4 to some extent, so a large force is required when adjusting the vertical movement of the headrest 5.

In addition, in the case shown in FIGS. 16 to 18, when adjusting the headrest 5 downward, the lock release knob 1
3, but I was lucky that there was a restriction on the position to attach the lock release knob 13.

Furthermore, in the one shown in Fig. 9119, the lock release knob 1
6 is provided on the side of the seat back 1, there is a problem in that it is difficult to operate the lock release knob 16 when the user is seated.

It has also been considered to make the lock release knob 16 protrude above the seat back 1 as shown by the two-dot chain line, but in this case and in the above case as well, the lock release knob 16 and the headrest 5 are placed at a distant position. Therefore, it was not easy to adjust the height of the headrest 5.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat headrest vertical adjustment device that can easily adjust the height of the headrest.

(Means for Solving the Problems) In order to achieve this object, the present invention includes a headrest stay that is vertically movably held in a stay holding member at the upper end of the seat back, and a plurality of locking notches that are spaced apart in the vertical direction. The locking member, which is provided with the stay ← and held by the seatback, is engaged with the plurality of locking notches 10 by spring force, thereby increasing the mounting height of the headrest with respect to the seatback. In the headrest vertical adjustment device for a seat, the device is mounted so as to be movable along the outer surface of the stay, and when the stay is moved, the lock member is separated from the locking notch against the spring force. A lock release member is provided, and the interlocking mechanism for transmitting the operating force of the lock release operation knob attached to the headrest to the lock release member is a headrest vertical adjustment device of the seat attached to the headrest. It is something to do.

(Function) According to this configuration, it is possible to operate the lock release operation knob while supporting the headrest with both hands, and perform an operation to separate the lock release member from the locking notch provided in the stay. .

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 13.

[First Embodiment] FIGS. 1 to #17 show a first embodiment of the present invention.

In FIG. 6, 17 is a vehicle seat, 18 is a seat 1
A seat back 7 and a headrest 19 are attached to the upper end of the seat back 18.

A pair of cylindrical guides (not shown) are fixed to the upper end of the seat back 18 at intervals laterally as stay holding members. In addition, an escutcheon 20 and a locking device 21 which also serves as the escutcheon are attached to the upper end of each cylindrical guide. In FIG. 1, 20a is an insertion hole provided in the escutcheon 20. be.

The locking device 21 includes a case 22 shown in FIG.
A spring 24 (see FIG. 3) is interposed between the lock plate 23 and the lock plate 23 to bias the lock plate 23 outward.

In FIG. 7, 22a is an insertion hole provided in the case 22.

An upper end portion of the stay 25 is fixed to a frame (not shown) of the headrest 19. As shown in FIG. 1, a mounting piece 26 is fixed to the upper part of the stay 25, and locking notches 27 are formed in a portion of the stay 25 protruding from the headrest 19 at intervals vertically. This locking notch 27 is provided between the upper locking surface 27a and the lower inclined surface 27b, as shown in FIG.

A semi-cylindrical lock release plate 28 is engaged with the intermediate portion of the stay 25 as a locking member so as to be rotatable in the circumferential direction. As shown in the construction drawing and FIG.
9 and a horizontally extending link engagement piece 30 are provided, the spring engagement piece 29 is formed with a notch 29m for spring engagement, and the link engagement piece 30 is formed with an engagement hole 30a.

Moreover, a portion near the upper end of the lock release plate 28 is held by the stay 25 by a return spring 31 wound around the stay 25. One end of the return spring 31 is locked to the stay 25, and the other end is locked to the notch 29m of the spring locking piece 29.

An intermediate portion of a link 32 is pivotally attached to the mounting piece 26 by a pivot 33. The lower end of this link 32 is inserted into the retaining hole 30a, one end of a link 34 is pivotally attached to the upper end of the ring 32 with a pivot 35, and an unlocking operation knob 36 is fixed to the other end of the link 34. has been done.

The link mechanism composed of the links 32 and 34 constitutes an interlocking mechanism that transmits the operating force of the lock release operation knob 36 to the lock release plate 28.

Next, the headrest 1 provided with such a stay 25
The height adjustment operation No. 9 will be explained.

The stay 25.25- is inserted into the insertion hole 22a of the seat back 18.
.

20a and into cylindrical guides (not shown), and by engaging the lock plate 23 with one of the locking notches 27 of the stay 25 by the spring force of the spring 24, the stay 25 of the headrest 19 is fixed to the seat. The headrest 19 is fixed to the frame (not shown) of the seatback 18 and is fixed to the upper end of the seatback 18 .

From this state, if you grab the headrest 19 with both hands or one hand and pull it upwards, the lock plate 23 will move onto the inclined surface 2.
7b, it is removed from the locking notch 27 against the force of the spring 24, the stay 25 moves upward, and the headrest 19 moves upward.

On the other hand, when the lock release operation knob 36 is depressed, the first
In the figure, the link 32 is rotated counterclockwise around the pivot 33, the lock release plate 28 is rotated counterclockwise from the state shown in FIG. 4 as shown in FIG. 5, and the lock release plate 28 is locked. The plate 23 is moved away from the locking notch 27 against the spring force of the spring 24. Therefore, in this state, if you grab the headrest 19 with both hands and press it downward,
The headrest 19 will be displaced downward.

[Second Embodiment] FIGS. 8 to 12 show a second embodiment of the present invention.

In this embodiment, a lock release plate 37 (lock release member) having an arcuate cross-sectional shape is held on the stay 25 by an annular holder 38 so as to be vertically movable. A notch 39 shaped to follow the side of the locking notch 27 is provided in the middle part of the lock release plate 37, a bent stopper part 40 is provided in the lower end of the holder 38, and a bent stopper part 40 is provided in the upper end of the holder 38. A plate-shaped spring receiver 41 is integrally provided in the spring receiver 4.
1 is formed with a notch 41a for engaging the stay 25 and a notch 41b for engaging the wire. Furthermore, the notch 39 has an inclined surface 39m that extends along the inclined surface 27b of the locking notch 27.

Further, a spring receiver 42 integrally fixed to the stay 25 is disposed above the spring receiver 41, and a spring 43 is interposed between the spring receivers 41 and 42. This spring 43 always biases the lock release plate 37 downward.

A release device 44 for vertically operating the lock release plate 37 is attached to the stay 25 as an interlocking mechanism. This release device 44 has a spring receiver 42 at one end.
A tube 45 fixed to the tube 45, a wire 46 slidably attached to the tube 45 and having one end held by the spring receiver 41b, and a lock release operation knob 47 attached to the other end of the wire 46. have This release device 4
4 is disposed within the headrest 19, and a lock release operation knob 47 is made to protrude to the side of the headrest 19.

Next, the operation of the headrest vertical adjustment device for a seat having such a configuration will be explained.

The stay 25.25- is inserted into the insertion hole 22a of the seat back 18.
.

20a and into cylindrical guides (not shown), respectively, and the stay 25 of the headrest 19 is attached to the frame (not shown) of the seat back 18 by the locking device 21.
It is fixed in the same manner as in the example.

From this state, when the headrest 19 is grabbed with both hands or one hand and pulled upward, the locking plate 23 of the locking device 21 is locked against the spring force of the spring 24 by the action of the inclined surface 27b, similar to the first embodiment. It is removed from the notch 27, the stay 25 moves upward, and the headrest 19 moves upward.

On the other hand, when the lock release operation knob 47 is pulled and operated,
The lock release plate 37 is slid upward via the wire 46 of the release device 44. On this occasion,
The lock plate 23 is moved away from the locking notch 27 against the spring force of the spring 24 shown in FIG. 11), therefore, if the headrest 19 is grasped with both hands in this state and pressed downward, the headrest 19 will be displaced downward.

In the embodiment described above, an example was shown in which the stay 25 of the headrest 19 was fixed to the seat back side using the sliding lock plate 27, but the present invention is not necessarily limited to this.

For example, as shown in No. 13@, instead of the above-mentioned lock plate 23, protrusions 48a, 4 are installed on corresponding parts of both sides.
8a is provided, and the projecting pieces 48a, 48a are pivotally connected to the side of the case 22 of the locking device by pivots 49 and 49, and the lock plate 48 is connected to a portion of the lock release operation knob 48b side. A configuration may also be adopted in which a spring 50 is interposed between the bottom of the case 22 and the bottom of the case 22.

(Effects of the Invention) As explained above, the present invention provides a lock that is movably mounted along the outer surface of the stay and that separates the lock member from the locking notch against the spring force when the stay is moved. A release member is provided, and an interlocking mechanism for transmitting the operating force of the lock release operation knob attached to the headrest to the lock release member is attached to the headrest, so that the height of the headrest can be adjusted with one hand. It can be done easily with a small amount of force and without taking an unreasonable posture.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part showing a first embodiment of a seat headrest vertical adjustment device according to the present invention. FIG. 2 is a perspective view of the lock release plate shown in FIG. 1. FIG. 3 is an explanatory diagram of the lock plate shown in FIG. 1. FIGS. 4 and 5 are explanatory views of the operation of the lock release plate shown in FIG. 1. FIG. 6 is a perspective view of a seat equipped with the headrest vertical adjustment device shown in FIGS. 1 to 5. FIG. FIG. 7 is an enlarged view of the main part of FIG. 6. FIG. 8 is a perspective view of a main part showing a second embodiment of the seat head restraint vertical adjustment device according to the present invention. FIG. 9 is a perspective view of the lock release plate shown in FIG. 8. FIGS. 10 and 11 are explanatory views of the action of the lock release plate shown in FIG. 8. FIG. 12 is a partial perspective view of a seat provided with the headrest vertical adjustment device shown in FIGS. 8 to 11. FIG. FIG. 13 is an explanatory diagram showing another example of the lock plate. FIG. 14 is a partial perspective view of a seat equipped with a conventional headrest vertical adjustment device. FIG. 15 is an exploded perspective view of the headrest vertical adjustment device used in the seat of FIG. 14. FIG. 16 is a partial perspective view of a seat equipped with another conventional headrest vertical adjustment device. FIG. 17 is an explanatory diagram of the headrest vertical adjustment device shown in FIG. 16. FIG. 18 is an explanatory diagram of the stay shown in FIG. 16. FIG. 19 is a partial perspective view of a seat equipped with yet another conventional headrest vertical adjustment device. 18...Seat back 19...Headrest 21...Lock device 23...Lock plate (lock member) 24...Swing ring 25...Stay 27...Latching notch 28... Lock release plate (lock release member) 32
．． 33...Link (interlocking mechanism) 36...Lock release operation knob 37--Lock release plate (lock release member) 44
... Release device (interlocking mechanism) 47 ... Lock release operation knob

Claims (1)

[Claims] (1) The stay of the headrest is held by the stay holding member at the upper end of the seat back in a vertically movable manner, and a plurality of locking notches are provided on the stay at intervals in the vertical direction, and the lock is held by the seat back. In the headrest vertical adjustment device for a seat, the mounting height of the headrest relative to the seat back is adjusted by a member being engaged with one of the plurality of locking notches by a spring force, the outer surface of the stay is provided with a lock release member that is mounted movably along the headrest and that separates the lock member from the locking notch against the spring force when the lock release member is moved, and the lock release member is mounted on the headrest to operate the lock release operation knob that is mounted on the headrest. A headrest vertical adjustment device for a seat, characterized in that an interlocking mechanism for transmitting force to the lock release member is attached to the headrest.