JPH0444132Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a headrest device that allows stepless adjustment of the position of a seat in a passenger car or the like.

[Prior Art] Conventionally, in this type of headrest device, one using a friction structure is known as an adjustment mechanism for rotating the headrest main body in the front and back direction in order to match the physique, posture, etc. of the seated person. However, with this structure, there was a problem in that the operating loads in both the front and rear directions were equal, and a considerably large force was required.

Therefore, as a solution to this problem, a device described in Japanese Utility Model Application Laid-Open No. 55-157467 has been proposed. This device is provided with a coil spring at a pivot point located in the headrest main body that is tilted forward and backward, and which makes the operating torque of the main body different in the front and rear directions.

[Problems to be solved by the invention] However, in the headrest device, during foam molding of the cushioning material covering the mechanism part,
If the undiluted solution of the cushioning material flows into the mechanism section, the mechanism of the mechanism section will be damaged, so there is a problem that the cushioning material cannot be integrally foamed unless the mechanism section is covered with a cover body.

The present invention was developed in view of the above-mentioned circumstances, and is a head restraint device whose position can be adjusted steplessly.It changes the operating load in both the front and rear directions, and also uses a cushioning material without covering the mechanical part with a cover body. The object of the present invention is to provide a headrest device capable of integrally foaming.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a U-shaped stay whose legs are supported by the seat bag, and a stay that is wrapped around the horizontal part of the stay, and one end of which is wrapped around the horizontal part of the stay. Consisting of a spring locked to the stay, and a base frame to which an upper frame is fixed, the other end of the spring engages, and is rotatably attached to the stay via a pair of bushes, The spring is wound around the stay in a winding direction such that a forward biasing force is always applied to the base frame, and means is provided for adjusting the tightening force of the bush against the stay.

[Operation] The position of the headrest is maintained by the frictional force generated by tightening the bush against the stay. Since tilting the headrest forward is in the direction of the return of the spring, the operating load is lighter and operability is improved, whereas tilting the headrest backward is in the direction of increasing the spring load, which increases the operating load. It can reliably support rearward impact loads in the event of an accident.

Since the position of the headrest is maintained by the frictional force as described above, its inclination angle can be adjusted steplessly.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 2 denotes a U-shaped stay whose legs are supported by the seat back, and a locking pin 3 is provided protruding from the upper surface of the horizontal portion of the stay. A spring 1 is wound around the center of the horizontal portion of the stay 2. One end 1a of the spring 1 is latched to the locking pin 3, and the other end 1b is latched to a hook portion 4a of a base frame 4, which will be described later. As will be described later, the spring 1 is wound around the base frame 4 which is rotatably attached to the stay 2 in a winding direction such that an acting force is always exerted in the forward tilting direction. A pair of headrest body frames 8, 8 are fixed to the rear end portions of both sides of the base frame 4, and hook portions 4a are cut and raised to protrude in the horizontal portion, and a pair of elongated holes 4b are formed on both sides of the hook portions 4a, respectively. , 4b and bolt holes 4c, 4c are drilled therein, and two engagement holes 4d, 4d each are bored at both ends of the vertical portion.

To attach the stay 2 to the base frame 4, insert the legs of the stay 2 into the long holes 4b, 4b, and insert one end 1b of the spring 1 protruding laterally into the hook portion 4a. 2
At the horizontal part, apply a pair of bushes 5 from above and below, place a plate 6 on top of the upper bush 5, and insert the bolt 7 into the bolt hole 6.
The stay is rotatably attached to the base frame 4 by inserting it into the holes a and 4c and fastening it.
In this case, the pair of protrusions 6b, 6b protruding from the rear end of each plate 6 are engaged with the engagement holes 4d, 4d of the base frame 4, and then the fastening is performed. Then, the portion above the base frame 4 is covered with a cushioning material by, for example, foam molding of synthetic resin, and a headrest body is formed. The tightening force of the bush 5 on the stays 2a, 2b can be adjusted using the bolt 7.

In this way, the plate 6 and the bolt 7 constitute means for adjusting the tightening force of the bush 5 against the stay 2. The position of the headrest is maintained by the frictional force generated by the tightening force. Next, the operation of this embodiment will be explained based on FIG. 2. In this embodiment, the forward and backward tilting operation of the headrest is replaced by the deflection of the stay 2. Said spring 1
is always acting in a direction to tilt the headrest body forward due to its winding direction, so a clockwise force is always acting on the stay 2 in FIG. 2. Therefore, the resistance when the headrest body is tilted forward is smaller than the frictional force between the stay 2 and the bush 5 due to the auxiliary action of the spring 1, and the headrest body can be tilted forward to a desired angle with a relatively light operating load. can be moved. In addition, by adjusting the tightening force of the bush 5 to the stay 2 using the bolt 7, the operating load of the headrest body can be adjusted. In addition, in the most forward tilted position of the headrest body, the stay 2 is connected to the long hole 4 of the base frame 4.
It is determined by contacting the edge between b and 4b.

Next, when the headrest main body is operated to tilt backward, the force of the spring 1 acts as resistance to the operation. Therefore, the resistance during the backward tilting operation is the resultant force of the friction force between the stay 2 and the bush 5 and the acting force of the spring 1. In other words, a larger operating load is required during a backward tilt operation than when a forward tilt operation is performed. This makes it possible to reliably support the original function of the headrest, that is, the cushioning load applied to the headrest due to a rearward impact on the head in an emergency such as a rear-end collision. In addition, the last tilted position of the headrest body is such that the stay 2 is aligned with the elongated hole 4 of the base frame 4.
It is determined by contacting the front edges of b and 4b.

[Effects of the invention] As explained above, in the present invention, by reducing the operating load when tilting the headrest forward, the operation can be performed easily and smoothly, and the operating load when tilting the headrest backward is reduced. By increasing the weight, it is possible to safely deal with rearward impact loads in the event of an accident, etc.

In addition, even if the raw solution flows into the recording part during foam molding of the cushioning material, it will not affect its function in any way.
It becomes possible to integrally foam the cushioning material.

Furthermore, since the present invention maintains the position of the headrest using frictional force, its inclination angle can be adjusted steplessly, resulting in good operability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the headrest device of the present invention, and FIG. 2 is a schematic side view illustrating the operation of the device. 1...Spring, 2...Stay, 4...Base frame, 5...Button, 6...Plate,
7...Bolt, 8...Headrest body frame.

Claims (1)

[Scope of utility model registration request] A U-shaped stay whose legs are supported by the seat back, a spring wrapped around the horizontal part of the stay and one end of which is locked to the stay, and a headrest body frame fixed to the spring. a base frame which is engaged with the other end and is rotatably attached to the stay via a pair of bushes, and the winding direction is such that a biasing force always acts on the base frame in a forward tilting direction. A headrest device, characterized in that the spring is wound around the stay, and means is provided for adjusting the tightening force of the bush against the stay.