JP2542640Y2 - Headrest device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a headrest device in which a stay is extended upward from an upper end portion of a seat back, and a headrest body is supported on the stay so as to be able to adjust a vertical position and a posture. .

"Prior art" Conventionally, as a headrest device of this kind, for example,
There is one as shown in FIG.

That is, the stay 2 is mounted on the seat back 1 so as to be movable up and down, and the stay 2 is composed of an outer stay 3 and an inner stay 4 inserted so as to be vertically movable relative to the outer stay 3. A drive mechanism 6 for vertical position adjustment for vertically moving the inner stay 4 to adjust the vertical position of the headrest body 5 is provided, and an output end 6a of the drive mechanism 6 for vertical position adjustment and the outer stay 3 are provided. Are connected via the connection bracket 6b, and the outer stay 3 is connected to the inner stay 4
The headrest main body 5 is moved up and down relatively, and a drive mechanism 7 for adjusting the posture such as the front / rear position and the inclination is provided. The output end 7a of the drive mechanism 7 for attitude adjustment and the inner stay 4 form a connection bracket 7b. Are connected via the

[Problem to be Solved by the Invention] However, in such a conventional headrest device, a tool or the like is inserted from the back of the seatback 1 to output the output end 6a of the drive mechanism 6 for adjusting the internal vertical position and the outer stay 3. And an output end of a drive mechanism 7 for posture adjustment.
Since it is necessary to connect the inner stay 7a to the inner stay 4, the workability is not good, and this is a major obstacle in improving the productivity. In particular, when the headrest main body 5 is assembled to the seat back 1, when the headrest main body 1 is replaced due to, for example, a failure or the like, there is a problem that the number of man-hours for replacement work is significantly increased, and productivity is extremely reduced.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a headrest device which is excellent in usability by reducing the man-hour for replacing the headrest body.

"Means for solving the problem" The gist of the present invention for achieving the object is to extend the stay upward from the upper end of the seat back, and to adjust the posture of the headrest main body to the stay and adjust the posture. In the headrest device supported so as to be movable, the stay includes an outer stay mounted on the seat back so as to be vertically movable, and an inner stay fitted into the outer stay and movable up and down relatively to the outer stay. A driving mechanism for adjusting the vertical position of the outer stay and the inner stay that can move up and down together, and a driving mechanism for adjusting the position of the inner stay that can move only the inner stay up and down, are installed in the seat back; An elastic holding portion is provided on the inner output member which is the output end of the drive mechanism for adjustment, and a neck portion is provided on the lower end of the inner stay, and the strength is such that it does not come off with an operating load. The neck portion of the inner stay is held between the elastic holding portions of the output member, and the outer output member, which is the output end of the drive mechanism for adjusting the vertical position, is formed in a split tube shape, and is resiliently inserted into the groove formed in the outer stay. A locking claw that fits into the protruding portion is protruded from the inner edge of the circumferential opening, and the opposing enlarged pieces are formed on both edges of the split opening. An end for operation protrudes from the upper end of the back, and when inserted and rotated between the opposing spreadable pieces of the external output member, the space between the expandable pieces is widened, and a locking claw of the external output member is opened. And a headrest device provided with an operation rod member having a plate bar portion for removing the plate from the groove of the outer stay.

It is well-known that the headrest body is adjusted not only vertically but also back and forth or tilted.However, the present invention makes it possible to relatively displace the inner stay and the outer stay so that the relative displacement can be adjusted. It is used to adjust the posture of the headrest body.

[Action]

When the drive mechanism for adjusting the vertical position operates and the outer output member and the inner output member move up and down, the outer stay moves up and down via the outer output member and the inner stay moves up and down via the inner output member. . Thereby, the headrest body can be moved up and down to adjust its position.

When the drive mechanism for posture adjustment operates and the inner output member moves up and down, the inner stay moves up and down with respect to the outer stay via the inner lock member, thereby displacing the headrest body in the front-rear direction. Thus, the posture of the headrest body such as the front-rear position and the inclination can be adjusted.

To replace the headrest body attached to the seatback, the operation rod member projecting from the upper end of the seatback is rotated. When this rotation causes the plate bar portion to rotate between the expanded pieces forming a pair of the outer output member, the space between the expanded pieces expands, and the circumferential opening of the outer output member expands.
The locking claw comes off from the groove engraved on the outer stay.

Therefore, when the headrest body is pulled up strongly, the neck at the lower end of the inner stay spreads out the elastic holding portion of the inner output member and exits.

To mount the headrest body to be replaced, insert the outer stay deeply while inserting the outer stay into the outer output member. If the neck at the lower end of the inner stay reaches the elastic holding portion of the inner output member, push it in slightly more. Resiliently fit.

At the same time, the locking claw of the outer output member is fitted over the groove of the outer stay, and the outer stay is connected to the outer output member so as not to come off.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

 1 to 3 show an embodiment of the present invention.

As shown in FIG. 1, a headrest body 30 is attached to the seat back 10 via a pair of stays 20,20.

The stay 20 is constituted by pipe-shaped outer stays 21 and 21 arranged on both sides inside the seat back 10, and a pair of inner stays 22 which are fitted in the respective outer stays 21 and are relatively vertically movable. I have.

A pair of support members 11 is fixed to a frame (not shown) of the seat back 10, and a holder member 12 is fitted to each support member 11. The outer stay 21 is inserted and supported by the holder member 12 so as to be vertically movable. The holder member 12 is formed by extending a cylindrical leg 14 from a disk-shaped head 13.

As shown in FIGS. 1 to 3, inside the seat back 10, a drive mechanism 50 for adjusting the vertical position of the headrest main body 30 and a drive mechanism 50 for adjusting the vertical position of the headrest main body 30 are provided. A drive mechanism 60 for adjusting the front / rear position is provided.

The drive mechanism 50 for adjusting the vertical position has a drive motor 51 as a power source, a screw member 52 that moves up and down by the drive motor 51, and a screw member that moves up and down when the screw member 52 rotates forward and reverse. Nut member to be screwed
53 and.

The nut member 53 is fixed to an elevating bracket 54 extending to both sides corresponding to the stays 20, 20, and the holder members 12, 12
External output members 55, 55 are fixedly provided at both ends of a lifting bracket 54 extending to a position below the upper and lower brackets.

The outer output member 55 is formed in a split tube shape, and locking claws 56, 56 which resiliently fit into the groove 21a engraved on the outer stay 21 are protruded from the inner edge of the circumferential opening and face each other. To be spread
Are formed on both edges of the slit.

The drive mechanism 60 for front / rear position adjustment has a drive motor 61 fixedly mounted on a lifting bracket 54 of the drive mechanism 50 for vertical position adjustment as a power source, and a screw member 62 that moves up and down by the drive motor 61. And a nut member 63 screwed to the screw member 62 so as to move up and down when the screw member 62 rotates forward and reverse.

The nut member 63 is fixed to an elevating connecting member 64 extending to both sides corresponding to the stays 20, 20, and an inner output member is provided at both ends of the elevating connecting member 64 extending below the holder members 12, 12.
65 and 65 are fixed respectively.

The inner output member 65 has an upwardly open groove-shaped cross section,
A grooved elastic holding portion 66 is provided on the opening side of the groove, and the elastic holding portion 66 is resiliently fitted to the neck portion 22a formed at the lower end of the inner stay 22, and the elastic holding portion 66 is of such a degree that it does not come off with an operating load. Neck in strength
22a is pinched.

An operation rod member 70 extending vertically in the seat back 10 along the axis of the stays 20, 20 is provided in the seat back 10.
Are arranged.

A pivoted support pin 71 at the lower end of the operating rod member 70 is rotatably supported by a lower end pivoting bracket 14 fixed to a frame (not shown) of the seat back 10, and is operated from the upper end of the seat back 10. End 72 is projected. Operation end
The lever member 73 is mounted on the 72.

A plate bar portion 74 is formed between the pivoted support pin 71 of the operating rod member 70 and the operating end 72.

The plate bar portion 74 is formed by opposing spread pieces 57, 57 of the external output member 55.
When the operation rod member 70 is rotated, it is flat when the operated rod member 70 is rotated.
The outer pawls 55 are arranged so as to rotate between them to widen the gap and to release the locking claws 56 of the outer output member 55 from the groove 21a of the outer stay 21.

 Next, the operation will be described.

The locking claw 56 of the outer output member 55 is provided with the locking groove 21a of the outer stay 21.
And the vertical movement of the stay 20 is restrained. The elastic holding portion 66 of the inner output member 65 is elastically held in the locking groove 22a of the inner stay 22.

When the drive motor 51 of the drive mechanism 50 for adjusting the vertical position is actuated, the driving force is transmitted to the screw member 52, the nut member 53, the elevating bracket 54, the external output members 55, 55, the locking claws 56, and the external stay 21. Is moved up and down, and the inner stay 22 is also relatively displaced together with the drive motor 61, the screw member 62, the nut member 63, and the inner output members 65 and 65 of the drive mechanism 60 for adjusting the front and rear position mounted on the lifting bracket 54. Move up and down without.

Since the stays 20, 20 as a whole move up and down, the headrest body 30 can move up and down to adjust its up and down position.

When the external output member 55 moves up and down together with the lifting bracket 54, as can be seen in FIG. 2, the plate bar portion 74 of the operating rod member 70 is flat between the expanded pieces 57, 57 of the external output member 55. The to-be-expanded pieces 57, 57 move up and down with the plate bar portion 74 therebetween.

When the drive motor 61 of the drive mechanism 60 for adjusting the front / rear position is operated, the driving force is transmitted to the screw member 62, the nut member 63, the elevating connection member 64, the internal output members 65, 65, and the elastic holding portion 66, and the inner stay 22 moves up and down relatively with respect to the outer stay 21, whereby the headrest body 30 is displaced in the front-back direction, and the front-rear position of the headrest body 30 can be adjusted.

In order to replace the headrest body 30 attached to the seat back 10, the operating rod member 70 is pivoted by the lever member 73 projecting laterally from the head 13 of the holder members 12, 12, and Is rotated about the end 72 of the.

When the operating rod member 70 rotates, the plate bar portion 74 rotates between the expanded pieces 57, 57 of the external output member 55, and the interval between the expanded pieces 57, 57 increases as shown in FIG. As a result, the circumferential opening of the external output member 55 expands, and the locking claws 56, 56 come off the locking groove 21a formed in the outer stay 21.

In this state, when the headrest main body 30 is pulled up strongly, the inner stay 22 also tends to rise, and the neck portion 22a at the lower end of the inner stay 22 spreads out the elastic holding portion 66 of the inner output member 65 and exits. The stay 20 can be pulled out of the seat back 10 by pulling it up greatly.

To mount the headrest body 30 to be replaced, the outer stay 21 is passed through the holder member 12 and is inserted deeply while being inserted into the outer output member 55. When the neck 22a at the lower end of the inner stay 22 reaches the elastic holding portion of the inner output member, the inner stay 22 is pushed slightly stronger. Contrary to the above, the elastic holding portion 66 expands and the inner stay
After passing through 22, the elastic holding portion 66 is resiliently fitted to the neck portion 22a.

At the same time, the locking claws 56, 56 of the outer output member 55 engage with the grooves 22a of the outer stay 22 so that the outer stay 22 is engaged with the outer output member 55.
It is connected so that it does not come off The expanded pieces 57, 57 that were separated by the restoring force due to the elasticity of the outer output member 55 themselves approached,
The pivoted plate bar portion 74 returns to the original state.

In the above-described embodiment, the headrest body can be adjusted in the front-rear position by the relative displacement between the inner stay and the outer stay.However, the headrest body can be adjusted not only up and down but also by moving the headrest back and forth or tilting. The present invention is a well-known technology, and the present invention is an improvement of a device that makes it possible to relatively displace an inner stay and an outer stay and uses this displacement.

According to the headrest device according to the present invention, the operation rod member protruding from the upper end of the seat back can be rotated to release the restraint of the stay and can be pulled out. Workability of headrest replacement work is good, and maintainability can be improved.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a perspective view of a headrest device, FIG. 2 is a perspective view of the same main part, and FIG. FIG. 4 is a perspective view of a headrest device according to a conventional example. 10 ... Seat back 20 ... Stay 21 ... Outer stay, 21a ... Groove 22 ... Inner stay, 22a ... Neck 30 ... Headrest body 50 ... Drive mechanism for vertical position adjustment 55 ... External output member, 56 ... Locking claw 57 ... Expanded piece 60 ... Drive mechanism for adjusting the front and rear position 65 ... Internal output member, 66 ... Elastic holding part 70 ... Operating rod member, 73 ... Lever member 74 ... Plate bar part

Claims (1)

(57) [Scope of request for utility model registration] 1. A headrest device in which a stay is extended upward from an upper end portion of a seatback, and a headrest body is supported on the stay so as to be capable of adjusting a vertical position and a posture, wherein the stay is mounted on the seatback so as to be vertically movable. An outer stay, and an inner stay fitted inside the outer stay and movable up and down relative to the outer stay, for adjusting a vertical position of the outer stay and the inner stay being movable up and down together. And a drive mechanism for posture adjustment capable of vertically moving only the inner stay is mounted on a seat back, and an inner output member which is an output end of the drive mechanism for posture adjustment is provided with an elastic holding portion. A neck is provided at the lower end of the inner stay, and the neck of the inner stay is held by the elastic holding portion of the inner output member with such strength that the inner stay does not come off under an operating load. The outer output member, which is the output end of the mechanism, is formed in a split cylinder shape, and locking claws that resiliently fit into the grooves engraved on the outer stay are protruded from the inner edge of the circumferential opening to face each other. The expanded piece to be expanded is formed on both edges of the slit, is extended vertically in the seat back, and an operation end protrudes from the upper end of the seat back. An operation rod member having a plate bar portion for separating the engaging claw of the outer output member from the groove portion of the outer stay is provided by expanding the space between the expanded members when inserted and rotated between the expanding members. Headrest device.