JPH0344012Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a headrest whose position can be adjusted by moving the headrest main body back and forth with respect to a support stay.

``Prior Art'' Conventionally, there are various types of headrests whose positions can be adjusted, but most of them are operated manually using knobs or levers, and the headrests are simply grasped and moved to the desired position without any knobs or the like. Some proposals have been made to allow adjustment by stopping at the position.

``Problems to be solved by the invention'' However, in such conventional headrests, which are operated by knobs, etc., the knobs, etc. must be attached to the headrest body or protruded from the headrest body. There are also problems in that the form is restricted or complicated, which increases costs, and the protruding parts impair safety.If there are no knobs, etc., the structure tends to be complicated, which also increases costs. Moreover, there was a problem that problems were likely to occur in terms of durability.

The present invention has been made in view of these conventional problems, and aims to provide a headrest that allows position adjustment without using knobs or the like, and is simple in structure and easy to assemble.

"Means for Solving the Problems" The gist of the present invention for achieving the above purpose is to provide a headrest whose position can be adjusted by moving the headrest main body back and forth relative to the support stay. an upper end, a pair of swinging link members whose respective bases are pivoted to the upper end so as to stand up in parallel from the upper end, and tips of the pair of swinging link members are respectively pivotally mounted. A link mechanism consisting of a headrest frame supports the headrest frame so as to be movable back and forth, and a spring tensioned between the upper end of the support stay and the headrest frame attaches the headrest frame to the rear. a tooth member is pivotably supported on the head rest frame, the tooth member is biased and held reversibly between an engaged state and a disengaged state via a turnover spring; The member is provided with a release input end and a return input end, and one of the swing link members is integrally provided with a locking pawl that engages with the teeth of the tooth member so that it cannot be climbed over in one direction and that it can be crossed over in the opposite direction. fixedly installed in the constituent member of the link mechanism, and at the end of the engagement stroke in which the head rest main body is moved to the forefront, it engages with the release input end of the tooth member to release the engagement with the locking pawl and release the link mechanism. and a return engagement portion that engages with the return input end of the tooth member to reverse the headrest body to the engaged state and perform the return operation when the head rest main body is returned to its original position. It is characterized by a head rest.

``Function'' However, if you grab the head rest body and move it from the start end of the movement stroke toward the rear end,
The headrest body moves according to the link mechanism.
When moving, the engagement relationship between the teeth of the tooth member and the locking pawl changes, and if the headrest body is released at an appropriate position, the locking pawl will mesh with the tooth of the tooth member at that position, and the locking pawl will move toward the starting end. The headrest main body is locked so that it does not return, and when the headrest main body is moved to the end of the movement stroke, the release engaging part of the link mechanism engages with the release input end of the tooth member, and the tooth member is reversed to the released state. When the locking pawl is disengaged from the teeth of the tooth member and the released head rest body is returned to the starting end, the return engaging portion of the link mechanism engages with the return input end of the tooth member and reverses the tooth member to the engaged state. The locking pawl meshes with the teeth of the tooth member at the starting end of the movement stroke to return to the initial state.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which support brackets 1 are installed on both sides of the upper end of a support stay 10 that is erected on the seat back A of the seat.
1 is fixedly installed, and a headrest main body 20 is supported by this support bracket 11 via a link mechanism 30 so as to be movable back and forth.

The headrest main body 20 consists of a headrest frame 21 covered with an exterior material such as a pad, and a link mechanism that supports the headrest main body 20 and the headrest frame 21 on the support stay 10 so as to be movable back and forth based on the support brackets 11 on both sides. 30, 30 are provided.

The link mechanisms 30 on both sides are attached to the support brackets 11
and a first swing link member 40 whose base is pivotally connected to the front part of the support bracket 11 via a pivot shaft 31.
and a second swing link member 50 whose base is pivotally connected to the rear part of the support bracket 11 via a pivot shaft 32.
and the tips of the first swing link member 40 and the second swing link member 50 rising in parallel from the support bracket 11 are pivoted via pivot pins 33 and 34, respectively. It is composed of a side plate 22 of a headrest frame 21.
The first swing link member 40 and the second swing link member 5
0 is parallel, the link mechanism 30 becomes a so-called parallel link mechanism, but it is not necessary to do so.

The headrest main body 20 is biased rearward in the right direction in FIG. 1 by a biasing spring 23 stretched between the support bracket 11 and the headrest frame 21.

A tooth member 60 is swingably supported on one side plate 22 of the head rest frame 21 via a pivot pin 61, and a tooth portion 62 is carved in the tooth member 60.

On the other hand, the first swing link member 40 is fixedly provided with a locking pawl 41 that cannot be climbed over the teeth 62 of the toothed member 60 in one direction, but that can be climbed over in the opposite direction, and at its base end, A cut-and-raised release engagement portion 42 is provided which engages a part of the tooth member 60 to release the engagement between the locking pawl 41 and the tooth member 60 when the head rest main body 20 is moved to the end of the movement stroke. The pivot shaft 31 of the first swing link member 40 is connected to the headrest main body 20 which is opened at the end of the movement stroke.
When the tooth member 60 is returned to its original position at the starting end, the tooth member 60 is engaged with a portion of the tooth member 60 to perform a return operation.

The tooth member 60 has a head rest main body 2 at one end.
A release input end 63 is provided with which the release engagement portion 42 engages in order to release the engagement with the locking pawl 41 when the 0 is moved to the end of the movement stroke.
A return input end 64 is provided so that when the head rest main body 20 released at the end of the movement stroke is returned to its original position at the starting end, the pivot shaft 31 serving as a return engagement portion engages and performs a return operation. There is.

A leaf spring 65 is stretched between the vicinity of the pivot pin 61 of the tooth member 60 and the headrest frame 21,
The direction of action of the leaf spring 65 is arranged to be reversed from one side of the center of the pivot pin 61 to the other side depending on the swinging state of the tooth member 60, so that the leaf spring 65 acts as a turnover spring and the tooth member 60 is biased and held reversibly between an engaged state and a released state.

Next, the effect will be explained.

In FIG. 2, the headrest main body 20 and the headrest frame 21 are at the most retracted position, which is the starting end of the movement stroke, and the locking pawl 41 engages with the starting end of the tooth portion 62 of the tooth member 60, and the headrest frame 21 and The headrest main body 20 is the second
In the figure, it is locked so that it does not move to the right. The locking claw 41 is locked in this manner no matter which tooth of the tooth portion 62 of the tooth member 60 is meshed with.

When adjusting the position of the headrest body 20, grip the headrest body 20 and apply force to move it to the left in FIG. Then, the head rest main body 20 and the head rest frame 2
1 moves, the link mechanism 30 operates, and the first swing link member 40 and the tooth member 60 attempt to rotate. If the force is greater than a predetermined value, the locking claw 41
rides on the side surface of one tooth of the tooth portion 62 of the tooth member 60 and climbs over it one after another.

If you release the headrest main body 20 at an appropriate position,
The locking pawl 41 meshes with the teeth of the tooth portion 62 of the tooth member 60 at that position, and the head rest frame 21 and the head rest main body 20 are stopped at that position.
You can adjust it to your desired position.

If the desired position has been exceeded, move the headrest main body 20 largely to the left in FIG. engages with the release input end 63 of the tooth member 60 and rotates the tooth member 60 counterclockwise in FIG. 6
Beyond the center of the pivot pin 61 of 0, the tooth member 60 is reversed to the released state and is biased and retained, as shown in FIG.

Therefore, when the headrest main body 20 and the headrest frame 21 are moved rightward from the position shown in FIG.
And the head rest frame 21 can be returned to the starting end of the movement stroke.

When the headrest main body 20 and the headrest frame 21 return to the starting end of the movement stroke, the pivot shaft 31, which is a return engagement portion, engages with the return input end 64 of the tooth member 60, as shown in FIG. The tooth member 60 is rotated clockwise in the figure for a return operation, and the line of action of the leaf spring 65 crosses the center of the pivot pin 61 of the tooth member 60 from the opposite direction to the above.
As shown in FIG. 5, the starting end of the tooth portion 62
1, and if the headrest main body 20 and the headrest frame 21 are slightly moved forward, the state shown in FIG. 2 will be restored.

Therefore, by moving the headrest main body 20 and the headrest frame 21 to the left in FIG. 2, the position can be adjusted as described above.

Note that the release input end, return input end, locking pawl, release engagement portion, return engagement portion, etc. of the tooth member may be appropriately provided at a portion where the members move relative to each other due to movement of the headrest main body. However, the present invention is not limited to the configuration of the above embodiment.

"Effects of the invention" According to the headrest according to the invention, the position of the headrest body can be adjusted without providing any knobs or levers, so there is no need to attach unnecessary items to the outside of the headrest body.
The structure becomes simpler. In addition, the position can be adjusted by a simple mechanism by minimizing the number of components of the adjustment mechanism, and a headrest whose position can be adjusted can be provided at a low cost.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is an exploded perspective view showing the internal structure of the headrest, Figure 2 is a longitudinal sectional view of the headrest main body,
3 to 5 are explanatory diagrams for explaining the operation, and FIG. 3 shows a state in which the headrest main body is at the forefront position, which is the end of the movement stroke, and the tooth member is in the released or inverted state; The figure shows a state in which the headrest body has been returned to its original state with the tooth member in the released state, and FIG. 5 shows a state in which the tooth member has returned to the engaged state. 10...Support stay, 11...Support bracket, 20...Head rest main body, 21...Head rest frame, 22...Side plate, 30...Link mechanism, 31... Pivot shaft (return engagement part), 40 ……
First swing link member, 41...Latching claw, 42...
Release engagement portion, 60...Tooth member, 62...Tooth portion, 6
3...Release input terminal, 64...Return input terminal, 65...
...Leaf spring.

Claims (1)

[Claims for Utility Model Registration] In a headrest whose position can be adjusted by moving the headrest main body back and forth with respect to a support stay, each of the bases is configured to stand up in parallel with the upper end of the support stay and the upper end. The headrest frame is movable back and forth by a link mechanism consisting of a pair of swinging link members pivotally attached to the upper end and a headrest frame to which the tips of the pair of swinging link members are pivoted, respectively. The head rest frame is supported by a spring stretched between the upper end of the support stay and the head rest frame, and the tooth member is pivotably supported on the head rest frame. , the tooth member is biased and held reversibly between an engaged state and a released state via a turnover spring, and the tooth member is provided with a release input end and a return input end, and the swing link member A locking pawl is integrally fixed to one of the teeth of the tooth member, and engages with the teeth of the tooth member so that it cannot be climbed over in one direction, and that it can be crossed over in the opposite direction, and the headrest main body is attached to the component of the link mechanism with the headrest main body facing forward. At the end of the moved engagement stroke, the release engagement portion engages with the release input end of the tooth member to release the engagement with the locking pawl and bring it into the released state, and the headrest body is returned to its original position. A headrest characterized in that a return engaging portion is provided which engages with the return input end of the tooth member to reverse the engagement state and perform a return operation.