JPH0451633Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is attached to a headrest that is provided at the upper end of the seat bag and supports the head of the seated person, and the height is adjusted according to the position of the seated person's head. This invention relates to a height adjustment mechanism for a seat headrest.

[Conventional technology]

For example, a headrest is provided at the upper end of the seat back of a seat in various types of vehicles, such as passenger car seats. This type of headrest supports the head of the seated person, and in the event of a collision, the seated person's head has a safety function that restricts the backward movement of the seated person's head relative to the torso, reducing injuries to the groin area. have. In addition, under normal conditions, the headrest maintains stability of the head of the seated person, thereby helping to ensure an optimal posture that does not cause fatigue.

A height adjustment mechanism for the headrest attached to the headrest is provided so that the seated person can set the headrest to an optimal head support position according to the sitting height.

This type of headrest height adjustment mechanism is attached to a headrest that is formed separately from the seat bag. Such a separable headrest is attached to the upper end of the seat bag by a support rod called a stay that is interposed between the headrest and the upper end of the seat bag. Generally, a stay is composed of two rods placed side by side or one rod bent into a square shape. As a headrest height adjustment mechanism, a configuration is known in which an operating handle is provided on the side of the headrest, for example, and the headrest is raised and lowered by rotating the operating handle.

Such a headrest height adjustment mechanism is constructed by, for example, a pinion gear operably connected to the operation handle of the headrest meshing with a rack formed at the free end of a stay whose one end is fixed to the seat back. . The pinion gear rotates as the operating handle rotates, and the pinion gear moves by itself relative to the rack, thereby raising and lowering the headrest.

Further, a configuration including a link and a gear is also known. In such a configuration, for example, a link is provided between the headrest and the stay, and a gear is provided between the operating handle and the link for transmitting rotation of the operating handle. Then, the rotation of the operating handle drives the gear and rotates the link.
This raises and lowers the headrest.

[The problem that the idea aims to solve]

However, as mentioned above, pinion gear,
A structure that combines racks, a link, and a gear has a large number of parts, so the structure tends to become complicated. Moreover, relatively high precision is required for the main components such as gears and racks, and the headrest height adjustment mechanism cannot be manufactured at low cost.

The object of this invention is to provide a height adjustment mechanism for a seat headrest that has a simple structure and can be produced at low cost.

[Means to solve the problem]

To achieve this object, according to one embodiment of the invention, a base bracket is fixed to the headrest, and one end of a stay interposed between the headrest and the seatback is fixed to the seatback. A bellcrank-shaped link having a rotatable adjuster nut at one end is rotatably attached to the base bracket. Further, a drive shaft having an operating handle at one end and an adjusting screw on its outer circumferential surface that can be screwed into an adjusting nut is attached to the base bracket so as to be rotatable but immovable in the axial direction of the drive shaft. The other end of the link is connected to a stay bracket fixed to the other end of the stay.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the seat headrest height adjustment mechanism 10 according to the present invention includes, for example, a base bracket 12 fixed to the headrest 11 and a stay 16 fixed at one end to the seat back 14. are connected by a link 18.

The stay 16 is constructed by bending a rod into a square shape, and, for example, plate-shaped stay brackets 20 with bent ends are fixed to the other end of the stay. The base bracket 12 is formed, for example, to hold the stay bracket 20, and is slidably attached to the outside of the stay bracket.

The link 18 is formed in a bell crank shape,
It is rotatably attached to the base bracket 12 by a pivot pin 24. The link 18 having such a configuration rotates about the pivot pin 24 as a fulcrum. The link 18 is formed, for example, by bonding two steel plates together, and has one end 18a bent away from each other to form a pair of bent pieces 26. Between the bent pieces, An adjusting nut 28 is provided. Here, adjust the nut 28
has a pair of extension pins 30 extending to both sides, and the extension pins are rotatably attached to a pair of insertion holes 32 formed in the bent pieces of the link. As will be described later, the adjusting nut 28 is screwed into an adjusting screw 36 of a drive shaft 38 and moves linearly in the horizontal direction. However, since the end 18a of the link to which the adjusting nut 28 is attached rotates around the pivot pin 24, there is a difference in trajectory between the linear movement of the adjusting screw and the rotation of the end 18a of the link. Misalignment occurs. Therefore, the insertion hole 32 through which the extension pin 30 of the adjusting nut is inserted is made into an elongated hole in the vertical direction, and the adjusting nut 28 is made movable in the vertical direction to compensate for the deviation in the trajectory between the end portion 18a of the link and the adjusting nut. It is preferable to do so.

Drive shafts 38 each have an operating handle 34 at one end and an adjustment screw 36 on the outer circumferential surface that can be screwed into the adjustment nut 28.
is pivotally supported, for example, by a shaft bracket 40 fixed to the side of the base bracket 12. The drive shaft 38 has, for example, a ring-shaped stopper 42 on the outside of the shaft bracket 40, and an E-ring 44 that prevents the drive shaft from separating from the shaft bracket. (not shown) to stop the shaft bracket, E
It's stuck between the rings. In such a configuration, the drive shaft 38 is rotatable and immovable in the direction of the drive shaft axis. Then, tighten the adjusting screw 36 on the outer peripheral surface with the adjusting nut 28.
A drive shaft 38 is disposed in screw engagement with the drive shaft 38 .

Further, the pivot pin 46 is inserted into the insertion hole 48 of the other end portion 18b of the link, the elongated hole 50 of the base bracket 12,
Insert into the insertion holes 52 of the stay bracket one after another,
The end 18b of the link is connected to the stay bracket 20. Here, the elongated hole 5 of the base bracket
0 is formed in an arc shape centered on the pivot pin 24 which is the fulcrum of the link, and allows the pivot pin 46 to move as the link 18 rotates.
The rotation range of the link is regulated. Note that the end portion 18b of the link draws an arc centered on the pivot pin 24. However, the connected base bracket 12 of the link end 18b is connected to the stay bracket 2.
0 and tends to move vertically together with the pivot pin 46, causing a deviation from the rotation trajectory of the end portion 18b of the link. Therefore, it is preferable that the insertion hole 52 of the stay bracket be a horizontally elongated hole to compensate for the deviation of the trajectory. However, the present invention is not limited to this, and for example, the insertion hole 48 of the end portion 18b of the link may be made into a long hole to compensate for the deviation of the trajectory.

According to such a configuration, the drive shaft 38,
In turn, the adjusting screw 36 is rotated integrally with the rotation of the operating handle 34. At this time, the adjusting nut 28 screwed into the adjusting screw 36 is connected to the pair of bent pieces 2 of the link.
6, rotation in the same direction as the adjusting screw is prevented. Therefore, the adjuster nut 28 is moved forward and backward by the rotation of the operating handle 34, and the link 18 is moved forward and backward by the rotation of the operating handle 34.
to rotate the end 18b of the link.

The seat headrest height adjustment mechanism 10 configured as described above is operated as follows.

The state in which the headrest 11 is at its lowest position is assumed to be the initial position, as shown in FIG. In FIG. 2, the pivot pin 46 of the link end 18b is located at the upper edge of the elongated hole 50. When the adjusting screw 36 is rotated by rotating the operating handle 34 from such a position, the adjusting nut 28 screwed into the adjusting screw moves rearward (to the left) (retreats). And Asiast Nut 2
8 moves backward, the link 18 moves to the pivot pin 24.
(Fully point) as the center of rotation, it attempts to rotate counterclockwise as shown by the arrow. At this time, pivot pin 4
Since the stay bracket 20 connected to the end portion 18b of the link by 6 is fixed to the stay 16 fixed to the seat bag 14, as the link 18 rotates, the base bracket 12 moves upward. and the headrest 11 is raised.

For example, as shown in FIG. 3, when the pivot pin 46 of the end portion 18b of the link comes into contact with the lower edge of the elongated hole 50 of the base bracket and the rotation of the link 18 is restricted, the head rest 11 Rising is prevented and the highest position of the headrest is set.

Conversely, when the operating handle 34 is rotated in the opposite direction at the uppermost position of the head rest 11 as shown in FIG.
The adjuster nut 28 screwed into the link 18 moves forward (to the right), and the link 18 is rotated clockwise. When the pivot pin 46 of the end portion 18b of the link comes into contact with the upper edge of the elongated hole 50 of the base bracket and the rotation of the link is restricted, the lowering of the headrest 11 is prevented, and as shown in FIG. As shown, the lowest position of the headrest is set.

As described above, according to the seat headrest height adjustment mechanism 10 of this invention, the drive shaft 38
Adjustment screw 36 formed on the outer peripheral surface of
The height of the headrest 11 is adjusted by the rotation of the link 18 as the adjuster nut 28, which is screwed into the headrest, moves forward and backward. Therefore, link 18
The movement of the adjuster nut 28 that causes the rotation can be arbitrarily set according to the rotation angle of the drive shaft 38, that is, the rotation angle of the operating handle 34, and the height of the headrest 11 can be adjusted steplessly.

The end portion 18a of the link is rotatably attached to the base bracket 12 by the pivot pin 24.
It is sufficient to provide an adjusting nut 28 on the drive shaft 38, form an adjusting screw 36 screwable to the adjusting nut on the drive shaft 38, and connect the end portion 18b of the link to the stay bracket 20 fixed to the seat back 14. Therefore, three of the drive shafts 38, on which the link 18, the adjustment nut 28, and the adjustment screw 36 are formed,
The height adjustment mechanism 10 is simplified in structure since the height adjustment mechanism 10 is only made of the main component. Further, the combination of the adjusting nut 28 and the adjusting screw 36 does not require high precision and the parts themselves can be made at low cost, so that an inexpensive seat headrest height adjustment mechanism 10 can be obtained.

Further, the base bracket 12 is formed in a shape to hold the stay bracket 20, and is slidably attached to the stay bracket 20. and,
Since the stay bracket 20 can be held with a sufficient length, the backlash of the base bracket 12 with respect to the stay 16 can be reduced, and the headrest 11 can be moved up and down stably.

In the embodiment, the link 18 is made of two steel plates pasted together, the ends 18a are bent apart, and an adjuster nut 28 is provided between the bent pieces 26. However, it is sufficient that the adjusting nut 28 is rotatably attached to one end of the link 18, and the end of the link formed from a single steel plate is bent into a substantially U-shape, and the adjusting nut is rotated between the bent pieces. It may be provided if possible. Also, the end portion 18b of the link
is connected to the stay 16 via a stay bracket 20 fixed to the other end of the stay 16. However, the present invention is not limited to this, and for example, the stay 16
A part of the connecting part of the link is formed flat by a press or the like, and an insertion hole 52 through which the pivot pin 46 is inserted is formed in this flat part, and the end part 18b of the link is attached to the stay by the pivot pin 46. They may be directly connected.

Further, in the embodiment, the base plate 12 is fixed within the headrest 11, and one end of the stay 16 is fixed to the seat back 14. However, it is not limited to this configuration; for example,
As shown in FIG. 4, contrary to the above, the base plate 112 is attached to the seat back 14 and the stay 116
Fix one end of each to the headrest 11,
A seat headrest height adjustment mechanism 110 may also be configured.

As can be clearly seen from FIG. 4, in this embodiment, a link 18, a drive shaft 38 having an operating handle 34 at one end and an adjusting screw 36 screwed into an adjusting nut 28 of the link are provided. with the base bracket 112
is fixed to the seat back frame 56, for example. At this time, the operating handle 34 is provided on the side of the seat bag 14. and,
The end 18b of the link is connected to the stay bracket 120 by a pivot pin 46.

Further, the stay 116 is inserted into a pair of stay holders 58 fixed to the upper end of the seat back frame 56, and is inserted into the seat back frame 56.
6 is slidably attached.

As shown in FIG.
b is located at the lower edge of the elongated hole 50 of the base bracket. When the operating handle 34 is rotated to rotate the adjusting screw 36, the adjusting nut 28 screwed into the adjusting screw moves to the right (advance). Then, as the adjuster nut 28 moves forward, the link 18
rotates clockwise around the pivot pin 24 (fulcrum) as shown by the arrow. Then, the end 18b of the link
moves upward along the elongated hole 50 of the base bracket, pushes up the stay bracket 120 and raises the headrest 11. Also, from the state where the headrest 11 is raised, if the operating handle 34 is rotated and the adjustment screw 36 is rotated to move the adjustment nut 28 to the left (backward), the link 18 will be rotated counterclockwise. is moved to lower the headrest 11.

Although this invention is most suitable for headrests of vehicle seats, it is not limited thereto. In other words,
The idea of this invention can be applied to, for example, acupressure seats, reception seats, general household seats, etc.

The above-mentioned embodiments are for illustrating this invention, and are not intended to limit this invention in any way, and any modifications, modifications, etc. made within the technical scope of this invention are also included in this invention. Needless to say.

[Effect of idea]

As described above, according to the seat headrest height adjustment mechanism according to this invention, the rotation of the link is caused by the forward and backward movement of the adjuster nut screwed into the adjuster screw formed on the outer peripheral surface of the drive shaft. The height of the headrest is adjusted by the movement. Therefore, the movement of the adjuster nut that causes the rotation of the link can be arbitrarily set according to the rotation angle of the drive shaft, that is, the operating handle, and the height of the headrest can be adjusted steplessly.

Then, an adjusting nut is provided at one end of the bell crank-shaped link rotatably attached to the base bracket, an adjusting screw that can be screwed onto the adjusting nut is formed on the drive shaft, and the other end of the link is attached to the seat back. It is sufficient to connect it to the bracket of a fixed stay.
Therefore, the height adjustment mechanism is structurally simplified, with only three main components: a link, an adjusting nut, and a drive shaft having an adjusting screw formed thereon. Also, Asian nuts,
The combination of adjusting screws does not require high precision and the parts themselves can be made at low cost, so an inexpensive seat headrest height adjustment mechanism can be obtained.

Further, the base bracket is formed in a shape to hold the stay bracket, and is slidably attached to the stay bracket. Since the stay bracket can be held with sufficient length, the backlash of the base bracket against the stay can be reduced.
The headrest can be raised and lowered stably.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the height adjustment mechanism of the headrest for a seat according to this invention, and Figures 2 and 3 are a part of the height adjustment mechanism for the headrest for a seat at the lowest and highest positions of the headrest. Each cutaway front view, FIG. 4, is a partially cutaway front view of the seat headrest height adjustment mechanism at the lowest position of the headrest in another embodiment of this invention. 10,110... Seat headrest height adjustment mechanism, 11... Headrest, 12,112...
...Base bracket, 14...Seat back, 1
6,116...Stay, 18...Link, 20,
120...Steer bracket, 24...Pivot pin (fulcrum), 28...Adjustment nut, 34, 13
4... Operation handle, 36... Adjustment screw, 38... Drive shaft, 46... Pivot pin, 50... Long hole.

Claims (1)

[Claims for Utility Model Registration] (1) A bellcrank-shaped link that fixes a base bracket to the headrest, fixes the headrest to the seatback, and fixes one end of the stay interposed between the seatbacks, and has a rotatable adjuster nut at one end. is rotatably attached to the base bracket, and has an operating handle at one end and an adjustment screw on the outer circumferential surface that can be screwed into the adjustment nut. A height adjustment mechanism for a headrest for a seat, in which the other end of the link is connected to a stay bracket that is fixed to the other end of the stay and is fixed to the other end of the stay. (2) The base bracket is fixed to the seat back, the headrest is fixed to the headrest, and one end of the stay interposed between the seatbacks is fixed, and a bell crank-shaped link with a rotatable adjuster nut at one end is rotatable to the base bracket. A drive shaft is mounted on the base bracket, and has an operating handle at one end and an adjusting screw on its outer circumferential surface that can be screwed into an adjusting nut, and is rotatably attached to the base bracket but not movable in the axial direction of the drive shaft, A height adjustment mechanism for a headrest for a seat, in which the other end of the link is connected to a stay bracket fixed to the other end of the stay. (3) The height adjustment mechanism for a headrest for a seat according to claim 1 or 2, wherein the base bracket is formed to hold a stay bracket.