JPH0347565Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a movable head rest provided on a vehicle seat, and more particularly to a movable head rest whose tilt can be adjusted by friction.

<<Prior Art>> An example of a movable head rest whose tilt can be adjusted is a friction type head rest shown in FIG. 4.

This movable headrest consists of a headrest frame 1, a pad 2 and a skin 3 surrounding the outer periphery of the frame 1, a bracket support 4 attached to the inner surface of the frame 1, and one end of the headrest frame 1. It is generally composed of a holding bracket 5 biased by a leaf spring 7, and a headrest stay 6 supported by the bracket 5. The headrest stay 5 has a substantially inverted U-shape, and has a horizontal shaft portion 6a supported by the bracket 5, and both side leg portions 6b protruding from elongated holes formed in the lower surface of the frame 1. be. Then, the bracket 5 presses the horizontal shaft portion 6a against the support base 4 side by the spring pressure of the leaf spring 7, thereby holding the movable headrest at a predetermined inclination angle position with respect to the headrest stay 6, and adjusting the angle. It is designed to provide frictional resistance at a certain time.

<<Problems to be solved by the invention>> By the way, in this type of movable headrest, a fan-shaped stopper 8 is provided on the horizontal shaft portion 6a as shown in the same figure, or a fan-shaped stopper 8 is provided on the horizontal shaft portion 6a from the frame 1 side.
By providing a lock plate or the like toward a, the range of forward and backward tilting of the movable headrest is regulated.

However, these locking means only have the function of regulating the two positions of the most forward tilt and the last tilt, so when a load greater than the spring pressure of the leaf spring 7 is suddenly applied, the movable headrest will not move. It is then tilted to the most forward or last tilted position and locked. Therefore, if a large load is suddenly applied to the movable headrest due to a rear-end collision, for example, the occupant's head held by the movable headrest will be strongly affected by the rapid tilting and locking of the movable headrest. There was a risk of being shocked.

The present invention was devised in view of these circumstances, and provides a movable headrest for this type of friction type that can absorb the shock and improve safety even when a large load is suddenly applied. The purpose is to

<Means for Solving the Problems> In other words, the present invention supports the upper horizontal shaft portion of the headrest stay by a holding bracket provided within the headrest frame and having one end biased by a leaf spring. A movable head rest that is elastically clamped and tilted and adjusted against the spring pressure of the leaf spring, wherein an energy absorbing damper is installed in the head rest frame, and the horizontal position of the damper and the head rest stay is It is characterized by being connected to the shaft part.

<<Operation>> When a load greater than the leaf spring pressure is applied to the movable headrest, the energy absorbing damper absorbs the load and prevents the movable headrest from rapidly tilting.

<<Example>> Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2. In addition, Figures 1 and 2
In the figures, the same parts as in the conventional example are given the same reference numerals and explained.

As shown in FIG. 1, a movable headrest installed in a vehicle seat includes two hollow headrest frames 1a and 1b, frames 1a and 1b.
A buffer pad 2 and a skin 3 surrounding the outer circumference of the frame 1b, a bracket support 4 fixed to the inner surface of the frame 1a by welding or the like, a holding bracket 5 provided on the support 4, and a It is generally composed of a supported headrest stay 6, a leaf spring 7 that biases one end of the bracket 5, a stopper 8 that restricts the tilting range of the movable headrest, and an energy absorption damper 10 that is connected to a shaft 9. has been done.

As shown in FIG. 2, the support stand 4 is made of an elongated body, and has a guide groove 41 bent at its upper end and a locking groove 42 at its lower end. A bracket 5 for supporting the headrest stay 6 is attached to the support base 4. The bracket 5 has a substantially Ω-shaped cross section with a curved central portion, and a lower end 52 is engaged with the locking groove 42 of the support base 4, and an upper end 51 is loosely fitted into the guide groove 41. Further, the headrest stay 6 supported by the support base 4 and the bracket 5 has a substantially inverted U shape, and a pair of leg portions 6b are joined to both ends of the horizontal shaft portion 6a via a mounting plate 61. The horizontal shaft portion 6a is held by a bracket 5 attached to the support base 4, and the plate spring 7, which is bent into a roughly wave shape, is inserted into the guide groove portion 4.
By inserting it into 1, it is elastically supported by the spring pressure of the leaf spring 7. As a result, the movable head rest is held at a predetermined inclination angle position with respect to the leg portion 6b of the head rest stay 6. A pair of substantially fan-shaped stoppers 8 are provided on the horizontal shaft portion 6a, and the movable headrest can be tilted forward against the spring pressure of the plate spring 7, for example, as shown by the imaginary line in FIG. At times, one end of the stopper 8 is locked to the inner wall of the support base 4 to restrict the tilting range.

In addition, shafts 9 each having a rectangular cross section are fixed to both ends of the horizontal shaft portion 6a, and are movable by connecting the tip 9a of each shaft 9 to an energy absorbing damper 10 attached to the inner surface of the frame 1a. Rapid tilting of the headrest is prevented. As shown in FIG. 3, the damper 10 has a resistor 12 having a plurality of blades 12a rotatably installed in a housing 11, and a resistance imparting material such as silicone oil in the outer peripheral space 13 of the resistor 12. When a large impact is applied to the movable headrest, the energy of the impact is absorbed by the friction caused by the viscosity of the resistance imparting material applied to the resistor 12. Note that this damper 10 may be of any type as long as it can absorb energy due to impact.
Of course, a well-known structure can be applied.

<<Effects of the invention>> As explained above, according to the invention, a large load that is suddenly applied is absorbed by the energy absorbing damper, so even in the event of a rear-end collision, the movable headrest will not tilt or lock suddenly. There will be no more trouble. As a result, the seater's head held by the movable headrest is always safely protected, and safety can be greatly improved.

In addition, the energy absorbing damper of the present invention functions as a holding force for the headrest or as friction resistance during angle adjustment when the spring pressure of the leaf spring becomes weak, so it can also serve as a supplementary function to the leaf spring. Becomes available.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a movable headrest according to the present invention, Fig. 2 is an exploded perspective view of essential parts of the headrest, Fig. 3 is a schematic sectional view showing an energy absorption damper, and Fig. 4 is a conventional example. FIG. 3 is a partial cross-sectional view of the movable headrest. 1a, 1b...Head rest frame, 4...
Bracket support stand, 5... Holding bracket, 6
...Head rest stay, 6a...Horizontal shaft part, 7
... leaf spring, 8 ... stopper, 9 ... shaft,
10...Damper for energy absorption.

Claims (1)

[Scope of utility model registration request] A holding bracket provided in the headrest frame and having one end biased by a leaf spring resiliently clamps the upper horizontal shaft portion of the headrest stay to resist the spring pressure of the leaf spring. What is claimed is: 1. A movable headrest whose tilting is adjusted by the headrest frame, characterized in that an energy absorbing damper is mounted within the headrest frame, and the damper is connected to a horizontal shaft portion of the headrest stay.