JPH0618536Y2 - Vehicle headrest - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicle headrest mounted on a vehicle seat.

[Prior Art] A headrest is widely used to prevent a occupant from getting a whiplash due to a collision accident and to stabilize the head position, as exemplified in Japanese Utility Model Laid-Open No. 1-104249. .

Although various structures have been proposed for this headrest,
In any structure, if the head of the occupant collides due to a collision,
The shock energy at this time is absorbed only by the cushioning material.

[Problems to be solved by the invention] Therefore, the energy absorption effect is limited. Further, there is a problem in that the cushioning material that cannot be absorbed may cause the occupant's head to collide with other parts of the vehicle cabin due to the reaction.

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the edge of the frame from protruding outward even if the frame is largely plastically deformed in the front-rear direction and to prevent the buffering effect from becoming safe. It is intended to provide a vehicle headrest having a structure capable of improving the property.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a headrest main body that covers the outer periphery of a frame with a buffer, and has a substantially inverted U-shaped stay provided at the bottom of the frame, In a vehicle headrest mounted on a seat back through a pair of through-holes provided in the lower portion of the frame, through which both side stay portions of the stay are inserted, and through the stay portions protruding downward, hole edge portions of the through-holes Has a tongue portion provided between the slits by forming two slits at a predetermined interval, and normally the tip portion of the tongue portion abuts the stay portion so that the position of the tongue portion can be regulated. Further, when an external force larger than a predetermined value is applied to the frame side, the tongue piece portion is bent and deformed so as to come into contact with the stay portion at a position different from the position regulation.

[Operation] According to the above configuration, the frame and the stay are positioned relative to each other via the tongue portion and are normally held at a predetermined position. When impact energy is applied to the headrest, the shock energy can be first absorbed by the buffer body. When the shock absorber receives a large amount of impact energy that cannot be absorbed, the tongue is deformed to move the frame side with respect to the stay, and the impact energy that cannot be absorbed is absorbed. Can be further absorbed.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of a vehicle headrest according to the present invention.

In the figure, a headrest 1 includes a reinforcing base material 2 provided as a frame, a cushioning body 3, and a headrest body 1a including the reinforcing base material 2 and the cushioning body 3 for attaching to a top portion of a seat back (not shown). It is composed of stays 4 and the like.

Further explaining the detailed structure with reference to FIGS. 3 and 4, the reinforcing base material 2 is press-formed with a metal plate material,
The rear surface 2a, the front surface 2b, and the bottom surface 2c are integrally formed, and the cross-sectional shape in the front-rear direction is formed into a substantially C shape. Among them, the rear surface 2a and the front surface 2b are formed in a state that the cross-section in the front-rear direction is substantially U-shaped, and the bottom surface 2c is substantially perpendicular to the front surface 2b between the front surface 2b and the bottom surface 2c. It is formed in a substantially L-shape when extended. Further, the tip portion 2d of the bottom surface 2c is bent upward at a substantially right angle. In addition, the bottom surface 2c
Has a through-hole 5 formed at a middle portion of the left and right and extending substantially in the front-rear direction, and substantially circular through-holes 6 at left and right positions sandwiching the hole 5. There is. In addition, each through hole 6 normally positions the reinforcing base material 2 which is a frame with respect to the stay 4, and
When an external force of a predetermined value or more is applied, the hole edge is deformed and the stay 4
The reinforcement base material 2 is allowed to move with respect to each of the through holes 6. Further, each through hole 6 is formed with a slit 7 extending in the front-rear direction in order to facilitate the deformation of the hole edge. The slit 7 is configured to absorb and spread the impact energy as will be described later, and can be changed to the tongue portion 14 of FIGS. 5 and 6. That is, the tongue piece 14 is provided at the hole edge portion of the through hole 6. The tongue portion 14 is provided between the slits 7a by forming two slits 7a at a predetermined interval, and the tip portion 14a of the tongue portion 14 normally abuts the stay portion 4b so that the position can be regulated.

Next, the stay 4 is made of a pipe-shaped metal material and has a horizontal connecting portion 4
a and a pair of stay portions 4b, 4b that are bent at right angles from the left and right ends of the horizontal connecting portion 4a in the same direction, respectively, and are formed in a substantially inverted U shape. . The stay 4 is provided on the bottom surface 2 of the reinforcing base material 2.
The stay portions 4b are inserted into and attached to the pair of through holes 6 formed in c, respectively, and thereafter, they are completely fixed via the bracket 8 and the bolt 9 and the nut 10. In this state, the stay portion 4b is inserted into the through hole 6 to position the reinforcing base material 2 with respect to the stay 4 in the front-rear and left-right directions.

On the other hand, the bracket 8 for preventing the stay 4 inserted in the through hole 6 from slipping off has a bulging portion 8a that allows the horizontal connecting portion 4a of the stay 4 to escape, and both sides sandwiching the bulging portion 8a. A contact surface portion 8b is provided which is in close contact with the bottom surface 2c. Further, each abutting surface portion 8b is provided with a mounting hole 11 respectively. In addition,
The interval dimension 1 of the pair of mounting holes 11 is set smaller than the length dimension L of the elongated hole 5. Then, in this bracket 8, after the stay portion 4b is inserted into the through hole 6 and the stay 4 is attached to the bottom surface 2c of the reinforcing base material 2,
The long holes 5 and the mounting holes 11 are mounted at corresponding positions. In this case, the bracket 8 is attached from above the stay 4 so as to receive the horizontal connecting portion 4a in the bulging portion 8a. When the contact surface portion 8b is brought into contact with the bottom surface 2c, the bolt 9 is then inserted through the mounting hole 11 and the elongated hole 5, and the nut 10 is further provided below the bottom surface 2c.
It is tightened and fixed by. As a result, the reinforcing base material 2 integrated with the stay 4 is formed.

Next, the buffer 3 is composed of the pad 12 and the skin material 13. Of these, the pad 12 is foam-molded, and the foam-molded is the reinforcing base material 2 integrated with the stay 4.
And (2) are put in the same foam molding die (not shown), and after that, the urethane undiluted solution is injected to carry out foam molding. And
By this foaming, the cushioning body 3 in which the outer surface of the reinforcing base material 2 is covered with the pad 12 and the skin material 13 is formed, and the headrest 1 in which the reinforcing base material 2 and the cushioning body 3 are integrated is made. After that, when the skin material 13 is subjected to a terminal treatment or the like, the integrated headrest 1 is completed.

In the headrest 1 configured in this way, the stay portion 4b is inserted into the through hole 6 to normally position the headrest body 1a with respect to the stay 4. Fifth
The same applies to the tongue piece configurations shown in FIGS. 6 and 6. Normally, the tip end portion 14a of the tongue piece portion 14 is in contact with the stay portion 4b of the stay 4, and this contact causes the headrest body 1a with respect to the stay 4 to contact. Positioning is in progress.

When impact energy is applied to the headrest 1 from the outside, the impact energy is first absorbed by the buffer body 3. Also, the impact energy at this time is
The impact energy is so large that it cannot be absorbed by itself, and this impact energy is also large due to the tightening force for tightening the bracket 8 with the bolts 9 and nuts 10. If there is enough force to move the head 7, the stay 4 pushes the slit 7 open, and at the same time, the headrest body 1a moves with respect to the stay 4 by the play between the long hole 5 and the bolt 9, and this movement causes an impact. It can absorb more energy.
The same applies to the cases of FIGS. 5 and 6, and when the shock energy that cannot be completely absorbed by the buffer 3 is received, the tongue piece 1
It is possible to move the headrest main body 1a with respect to the stay 4 while being pressed and deformed by the stay portion 4b, and this movement can absorb impact energy.
In this state, the tongue piece portion 14 is bent and deformed as shown in the figure and abuts on the stay portion 14a at different positions.

Therefore, with the above-mentioned configuration, the headrest 1 has improved impact absorption and improved safety.

In each of the above embodiments, the structure in which the stay portion 4b cannot normally move back and forth within the through hole 6 for position regulation is disclosed. However, the through hole 6 is formed as a long hole, and the position regulating portion is normally formed. When the movable body is moved within the long hole that is subjected to a large impact force and further moved, the slit 7 is expanded or the tongue portion 14 is deformed to absorb the impact force. It is also good.

[Effects of the Invention] As described above, according to the vehicle headrest of the present invention, when a large impact force cannot be absorbed by the shock absorber, the frame side is deformed with respect to the stay portion due to the deformation of the tongue piece. Therefore, the shock energy can be further absorbed, and the shock absorption is enhanced, so that the safety is improved.

[Brief description of drawings]

1 is an external perspective view showing an embodiment of a vehicle headrest according to the present invention, FIG. 2 is a schematic vertical sectional side view taken along the line AA of FIG. 1, and FIG. 3 is FIG. 1 and FIG. FIG. 4 is an external perspective view showing an essential part of the same headrest shown in FIG. 4, FIG. 4 is an exploded perspective view of an essential part of the same headrest shown in FIGS. 1 and 2, and FIG. 5 is a through hole part of the frame. FIG. 6 is a vertical cross-sectional side view taken along the line BB of FIG. 1 ... Headrest 1a ... Headrest main body 2 ... Reinforcing base material (frame) 4 ... Stays 4a, 4b ... Stay portion 6 ... Through hole 7, 7a ... Slit 14 ... Tongue piece portion.

Claims (1)

[Scope of utility model registration request] 1. A headrest body covers the outer periphery of a frame with a cushioning body, and has a substantially inverted U-shaped stay provided in the lower portion of the frame, and the stay is provided in a pair of through holes provided in the lower portion of the frame. Insert the stays on both sides of
In a vehicle headrest mounted on a seat back via a stay portion projecting downward, two slits are formed at predetermined intervals at the hole edge portion of the through hole, and are provided between the slits. The tongue piece has a tongue piece that normally comes into contact with the stay so that the tip of the tongue piece can be positionally regulated, and the tongue piece bends and deforms when an external force larger than a predetermined value is applied to the frame A headrest for a vehicle, which is brought into contact with a stay portion at a position different from the position regulation.