JPH0313377Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a support structure for a headrest of a seat, particularly a vehicle seat.

2. Description of the Related Art An example of a conventional headrest support structure for a seat will be described with reference to FIGS. 7 to 9. The seat 2 is composed of a seat cushion 4 and a seat back 6. A head rest 8 is attached to the seat back 6, and a head rest stay 10 is integrally connected to the head rest 8. A seat bag frame 12 is built into the seat bag 6, and a head rest bracket 14 having a U-shaped cross section is fixed to the frame 12, and a head rest guide 16 is incorporated into the bracket 14 without play. ing. The above-described headrest stay 10 is fitted inside the guide 16 and is in close contact with the guide 16, and the guide 16 supports the headrest 8. Therefore, the headrest 8 is the guide 1
6, and is further coupled to the frame 12 via a bracket 14. That is, the headrest 8 is rigidly connected to the seat back 6.
In addition, as shown in FIG. 9, the headrest 8 has two headrest stays 10, and
Two sets of each headrest guide 16 and headrest bracket 14 are attached to the frame 12.

Problems to be Solved by the Invention When the above-mentioned seat 2 is attached to something that vibrates, such as a vehicle, for example, in the case of an automobile, the vibrations of the vehicle body (floor 9) are transmitted to the seat 2, causing the seat back 6 to The headrest 8 also vibrates in the front-back direction. In particular, when the frequency of the seat back 6 matches the natural frequency of the headrest 8, the headrest 8 resonates and swings significantly.
As a result, the person sitting on the seat feels unpleasant vibrations in their body, and the headrest 8 and seat back 6 of the seat that is not occupied vibrate and swing back and forth, making it visible to people sitting on other seats. There is a problem that causes an unpleasant feeling.

Furthermore, as mentioned above, the headrest 8 has two headrest stays 10;
Two sets of headrest guides 16 and headrest brackets 14 are each attached to frame 12, but due to manufacturing errors, the dimensions and accuracy of these may vary slightly (in particular, the accuracy of the parallelism of the headrest guides may vary slightly). At this time, it may be difficult to attach the headrest stay 10 to the guide 16. That is, there is a problem in that the headrest has poor assemblability.

Means for Solving the Problems The present invention has been devised to solve the above-mentioned problems, and is provided in the seat back frame of a seat, and has a cross section having an upper piece part and a lower piece part extending opposite to each other. A head rest bracket formed in a U-shape, and a bottom portion that penetrates and is supported by an upper hole and a lower hole drilled in both the upper and lower pieces, and that closes the insertion hole for inserting the head rest stay and the lower end of the insertion hole. and a cylindrical head rest guide having at least one of the upper and lower holes and the head rest guide so as to be able to tilt the head rest guide in the front-rear direction of the seat. a gap is formed between the upper piece or the lower piece having the gap,
An elastic member is provided that biases the head rest guide to tilt and displace the head rest guide in the rear direction at all times, and the elastic member is horizontally suspended in the gap along the width direction of the seat, and has both ends connected to the upper part of the seat. The gist of the present invention is a support structure for a headrest, characterized in that the headrest is fixed to the upper part or the lower piece part.

Function According to the present invention, the headrest guide is elastically supported by the headrest bracket by an elastic member so as to be tiltable in the longitudinal direction of the seat.
The headrest stay is fitted and supported inside the headrest guide, and the headrest stay and the headrest are integrally connected, so the headrest is connected to the headrest bracket, that is, the seat bag, via the headrest stay and the headrest guide. It is elastically supported by the frame.

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4 and FIG. 7. Note that the same or equivalent parts as in the conventional structure are given the same reference numerals as in the conventional structure, and the explanation thereof will be omitted.

14a is a headrest bracket having a U-shaped cross section, and is attached to the frame 12 of the seat bag 6.
The upper piece 19 has a through hole 20,
A through hole 22 is formed in the lower piece 21 and has a diameter smaller than the inner diameter of the hole 20 and larger than the outer diameter of the cylindrical portion of the headrest guide 16a, which will be described later. 16a
is a headrest guide made of resin, the central part is cylindrical and passes through the holes 20 and 22,
The lower end portion is locked to the lower piece 21 of the bracket 14a, and the upper end portion is locked to the upper surface of the seat bag 6 (indicated by a two-dot chain line in FIG. 1). hole 20 and hole 22
As shown in FIG. 20 and hole 22 are drilled. Furthermore, since the inner diameter of the hole 20 is larger than the outer diameter of the cylindrical portion of the guide 16a, when the guide 16a is inserted into the holes 20 and 22, a gap A is created in front of the hole 20 (on the side of the seat cushion 4). can. Bracket 14a
A spring 24 is disposed and locked on the upper surface of the upper piece 19 in the width direction of the seat, horizontally spanning the gap A of the hole 20.
The cylindrical portion 6a is biased rearward (to the opposite side of the seat cushion 4) by the permeability force, and is pressed against the rear end edge of the hole 20. That is, the guide 16a is elastically supported by the bracket 14a. As shown in FIG. 4, the spring 24 is secured at both ends to the upper piece 19 of the bracket 14a. The headrest stay 10 of the headrest 8 is fitted into and supported by the guide 16a.

Since the inner diameter of the hole 22 is slightly larger than the outer diameter of the cylindrical portion of the guide 16a, the guide 16a, that is, the headrest 8, is moved forward (towards the seat cushion) using the hole 22 as a fulcrum by the biasing force of the spring 24. Can be tilted against. Therefore, since the headrest 8 is tiltable in the front-rear direction, the spring constant of the spring 24 is
By changing the weight of the stay 10 and the guide 16a, the natural frequency (resonance frequency) of the headrest 8 can be freely set.

When the seat 2 incorporating the structure described above is attached to the floor (vehicle body) 9 of a car, the vibrations of the floor 9 enter the seat cushion 4, the seat back 6 vibrates in the longitudinal direction, and the headrest 8 also vibrates. However, the natural frequency of the headrest 8 can be set to deviate from the frequency of the floor and the frequency of the seat back. Therefore, the headrest 8 has the effect of not resonating.
Furthermore, since the headrest 8 is elastically supported, it can act as a dynamic damper against vibrations of the seat back 6 in the longitudinal direction, and has the effect of reducing vibrations of the seat back 6.

Also, due to manufacturing errors, the head rest stay 1
Even if the precision of the two legs of the headrest bracket 14a is slightly off, or even if the mounting precision of the headrest bracket 14a to the frame 12 is slightly off, the headrest guide 16a will elastically support the bracket 14a, that is, the front and rear Stay 1 is supported so that it can be tilted in
0 can be easily assembled to the guide 16a. That is, the headrest 8 has the advantage of being easy to attach and assemble to the seat bag 6.

Note that since the cylindrical portion of the guide 16a is in contact with the rear edge of the hole 20 (see FIG. 4), the headrest 8 will not tilt further rearward. Therefore, when the seat is used as a car seat and a person is sitting on it, even if there is a rear-end collision, the headrest 8 moves (deforms) integrally with the seat back 6, so there is no risk that the person sitting will suffer whiplash.

In the first embodiment described above, the hole 20 in the upper piece 19 and the hole 22 in the lower piece 21 of the bracket 14a are arranged so that the rear edges of the holes are aligned (as described above). A hole 22 having a small inner diameter may be concentrically formed. In this case, the guide 16a will be in a state of being slightly tilted rearward than in the first embodiment.

The second embodiment shown in FIG. 5 is a modification of the first embodiment, and a hole 20b having a diameter larger than the outer diameter of the cylindrical portion of the headrest guide 16b is bored in the upper piece 19b of the headrest bracket 14b. Established, same 20b
A hole 22b with a larger diameter is provided in the lower piece part 21b,
The head rest guide 16b is passed through the headrest guide 16b. In this case, since a gap B is formed in the rear part of the guide 16b of the hole 22b (or so that a gap is formed), the spring 24b is placed horizontally in this gap B and arranged in the width direction of the seat, Guide 16b
It is locked to the lower piece part 21b so as to bias it.
That is, the spring 24b urges the cylindrical portion of the guide 16b forward (towards the seat cushion) to force the cylindrical portion of the guide 16b toward the hole 22.
It is pressed against the front edge of b. For this reason, guide 1
6b is tilted backward, and the cylindrical part of the guide 16b is connected to the hole 2.
For 0b, it abuts against the rear end edge of the hole 20b. Therefore, the guide 16b is elastically supported by the bracket 14b. Therefore, the second embodiment also has the same effects as the first embodiment.

The third embodiment shown in FIG. 6 is a modification of the first embodiment, in which the upper piece 19c and the lower piece 21c of the headrest bracket 14c have a diameter larger than that of the cylindrical part of the headrest guide 16c. , hole 20 of the same diameter
Drill holes c and 22c and attach the head rest guide 16.
c is passed through. Hole 20c, hole 22c
Since the inner diameter of the guide 16c is larger than the outer diameter of the cylindrical portion of the guide 16c, the hole 20c is larger than the outer diameter of the guide 16c of the hole 20c.
The spring 24
c is disposed in the width direction of the seat, and the guide 16c is biased to engage the upper piece 19c. That is, the spring 24c urges the cylindrical portion of the guide 16c rearward and presses it against the rear end edge of the hole 20c. Hole 2
2c, a spring 25c is disposed in the width direction of the seat so that a gap is formed at the rear of the hole 22c, and the guide 16c is biased and locked to the lower piece 21c. That is, the spring 25c is connected to the guide 16.
The cylindrical portion c is urged forward and pressed against the front edge of the hole 22c. Therefore, the guide 16c tilts backward, and the guide 16c also tilts toward the bracket 14c.
It is elastically supported against. Therefore, the third embodiment also has the same effects as the first embodiment.

In the above embodiment, the springs that bias the headrest guide are provided on the upper surface of the upper or lower piece of the headrest bracket, but they may also be provided on the lower surface, or a plurality of springs may be provided on both the upper and lower surfaces. I don't mind.

Further, elastic rubber or plastic may be used instead of the spring.

Further, in the above embodiment, the gap was formed only on one side of the head rest guide, but the guide may be supported by elastic members from both sides so that the gap is formed on both sides of the guide.

Furthermore, the guide may be permeably supported by being pulled by an elastic member from the side without the gap.
Further, it may be held by elastic members from both sides, the side with the gap and the side without the gap.

Effects of the invention As explained above in detail along with the examples,
According to the present invention, since the headrest guide is elastically supported so as to be tiltable in the longitudinal direction (of the seat) with respect to the headrest bracket, the headrest that is fitted and supported by the headrest guide can be tilted from the seat. This has the effect of preventing resonance due to vibration. Furthermore, since the headrest functions as a dynamic damper, it has the effect of reducing longitudinal vibrations of the seatback due to vibrations from the structure to which the seat is attached, such as the floor. Furthermore, even if the dimensional tolerance of the headrest stay or the installation accuracy of the headrest bracket to the frame varies due to manufacturing errors, the headrest guide is elastically supported as described above, so the installation of the headrest to the seat back is easy. It also has the effect of being easy to install, incorporate, and operate the headrest.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of the first embodiment of the present invention, FIG. 2 is a partially enlarged perspective view of the first embodiment of the present invention, and FIG. 3 is a partial sectional view taken along the line - in FIG. Figure 4 is an enlarged partial sectional view taken along the - line in Figure 1, Figure 5 is a partial sectional view corresponding to Figure 3 in the second embodiment of the present invention, and Figure 6 is a third embodiment of the present invention. A partial cross-sectional view corresponding to FIG. 3,
FIG. 7 is a schematic side view of the seat, FIG. 8 is a partial sectional view showing a conventional headrest support structure, and FIG. 9 is an exploded perspective view of the conventional headrest support structure. 2...Seat, 6...Seat back, 8...Headrest, 10...Headrest stay, 12
... Seat bag frame, 14, 14a, 1
4b, 14c...Headrest bracket, 1
6, 16a, 16b, 16c...Head rest guide, 24, 24b, 24c, 25c...Spring (elastic member), A, B...Gap portion.

Claims (1)

[Scope of utility model registration request] A head rest bracket is provided on the seat back frame of the seat and has a U-shaped cross section and has an upper piece and a lower piece that extend opposite each other, and an upper hole and a lower hole bored in both the upper and lower pieces. A cylindrical headrest guide that is supported through a hole and has an insertion hole for inserting a headrest stay and a bottom portion that closes the lower end of the insertion hole, wherein the headrest guide is inserted into the sheet. A gap is formed between at least one of the upper and lower holes and the head rest guide so as to be tiltable in the front-rear direction, and the upper piece or the lower piece has the gap. is provided with an elastic member that biases the head rest guide to tilt and displace the head rest guide in the rear direction at all times, and further, the elastic member is horizontally suspended in the gap along the width direction of the sheet, and has both ends thereof A support structure for a headrest, characterized in that it is locked to the upper piece or the lower piece.