JPH0411867Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thigh support device provided in a vehicle seat or the like.

In recent years, in vehicle seats, especially driver's seats, the support strength of the front part of the seat cushion, that is, the part that supports the thighs, has been adjusted according to the body length and leg length of the seated person. Products equipped with a built-in so-called thigh support device are widely used.

A conventional thigh support device of this type includes, for example, a movable frame 2 having a desired shape disposed at the front of a cushion frame 1, as shown in FIG.
The rear end of a is pivotally connected to a bracket 3 fixed to the side of the cushion frame 1 by a shaft pin 4, and an adjustment mechanism 5 is disposed between the movable frame 2 and the cushion frame 1. By rotating the operation dial 6 of the adjustment mechanism 5,
The support strength of the front part of the seat cushion of the seat is adjusted by rotating the movable frame 2 so that its front part 2' moves up and down with respect to the cushion frame 1.

That is, this conventional adjustment mechanism 5 has an operation dial 6.
It consists of a cam that rotates integrally with the cam and has a plurality of recesses on its circumferential surface, and a pin that protrudes from the movable frame 2 and comes into contact with the circumferential surface of the cam.The cam is rotated by operating the operation dial 6. As a result, the movable frame 2 is raised and lowered through the pin, and the pin of the movable frame 2 is engaged with the recess of the cam, so that the movable frame 2 is locked in the raised and rotated position.
This adjusts the support strength of the front part of the seat cushion. However, in such a conventional thigh support device, the raising and lowering rotation of the movable frame 2 is adjusted in stages, so the front part of the seat cushion cannot be accurately set to the desired support strength. Furthermore, if a strong impact is applied to the seat, there is a risk that the pin will come off from the recess of the cam, causing the movable frame 2 to rotate unexpectedly and changing the support strength of the front portion of the seat cushion.

Therefore, the present invention has been made in view of these points, and is an attempt to improve the configuration of the conventional thigh support device to solve the above-mentioned problems.

In order to achieve the above-mentioned object, the thigh support device of the present invention includes a movable frame that is pivotally attached to the front part of the cushion frame so that it can be rotated up and down, and a movable frame that is attached to the cushion frame from the pivot attachment part on the side of the movable frame. A cam is attached to a shaft corresponding to a required part separated from the movable frame, and has a slot whose radius continuously changes greatly as the movable frame rotates in the direction of the pivoting part, and a cam is attached to the side of the movable frame to rotate the cam. a pin that protrudes from the vertical line passing through the center on the side of the pivoting part of the movable frame and is engaged with a slot in the cam, and by rotating the cam in the direction of the pivoting part of the movable frame The movable frame is rotated upward through the engagement portion between the slot and the pin, and as the cam is rotated downward by an external force of the movable frame, the direction of the pivoting portion of the movable frame is rotated through the pin. The large diameter side of the groove is brought into contact with the pin so that the movable frame is prevented from rotating downward and is locked to the cushion frame. be.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 and 3. The same members as those in the conventional example described above will be denoted by the same reference numerals, and their explanation will be omitted.

In the figure, reference numeral 11 indicates the entire thigh support device of the present invention, and the movable frame 2 of this thigh support device 11 is
is formed into a substantially U-shape, and the movable frame 2 has an extension part 2a' extending the required length rearward from the pivot point to the cushion frame 1 on both sides 2a. A load bearing portion is constructed by extending an S-shaped spring 12 for receiving a load between 2a'. In addition to this spring 12, a pad receiving spring 12' is stretched between both sides 2a of the movable frame 2. And springs 12 stretched across these movable frames 2,
A seat pad is arranged on the upper surface from 12' to the cushion frame 1, and its surface is covered with a skin 13 to form a seat cushion.

With this configuration, when the occupant is seated, the weight of the occupant is transferred to the extension portion 2 of the movable frame 2.
a', thereby making it possible to adjust the balance with the load of the seated person's thighs that is applied to the front portion 2' of the movable frame 2, thereby facilitating the rotational operation of the movable frame 2. That is, when rotating the movable frame 2 in the seated state in a direction in which the front portion 2' is set at a high position (in the direction of arrow a in the figure),
The rotation of the movable frame 2 is assisted by the weight of the seated person applied to its extension 2a', and therefore the adjustment mechanism 5 is adjusted in accordance with the amount of load applied to this extension 2a'. The force required to operate the operation dial 6 is reduced.

Furthermore, by forming the extension part 2a', a displacement in the direction opposite to the displacement of the front part 2' of the movable frame 2 occurs behind the pivot joint, so that The amount of relative movement of the movable frame 2 is larger than that of the conventional one, so even if the amount of displacement of the movable frame 2 is small, a large amount of support adjustment can be obtained as a whole.

The adjustment mechanism 5 is pivoted on the cushion frame 1 so as to be rotated together with the operation dial 6 in accordance with a required part of the side part 2a of the movable frame 2 that is remote from the pivot part, and the radius is continuously adjusted. Changing slot 1
4a, and a pin 15 that protrudes from the side 2a of the movable frame 2 and is engaged with the slot 14a of the groove cam 14. The groove hole 14a of the grooved cam 14 has a shape in which the radius continuously increases as it rotates in the direction of the shaft attachment part (shaft pin 4) of the movable frame 2, that is, the distance from the center of rotation gradually increases toward the front. It is formed in the shape and also pin 1
5 is attached to the side 2a of the movable frame 2, which is closer to the shaft attachment part (shaft pin 4) of the movable frame 2 than the vertical line passing through the center of rotation of the grooved cam 14, and the pin 15 and the center of rotation of the grooved cam 14. The angle between the straight line connecting pin 15 and the straight line connecting pin 15 and shaft pin 4 is 90° to 120°.
It is protruded at a position within the range of . The radius of the adjustment mechanism 5 configured like a lever can be continuously changed by rotating the grooved cam 14 in the direction of the shaft attachment part of the movable frame 2, that is, backward, using the operation dial 6 from the illustrated state. The pin 15 is pressed by the inner edge of the slotted hole 14a, so that the movable frame 2 is rotated steplessly upward about the shaft pin 4 in a direction that matches the rotation of the slotted cam 14. , the support pressure by the movable frame 2 on the thigh contact area of the seat cushion is adjusted. In this manner, when a downward load is applied to the movable frame 2 due to sitting or the like while the rotation of the grooved cam 14 is stopped at the desired adjustment position, the pin 15 is moved along a vertical line passing through the center of rotation of the grooved cam 14. Since the groove cam 14 is engaged with the slot 14a closer to the shaft attachment part of the movable frame 2, the groove cam 14 is rotated backward, that is, toward the shaft attachment part of the movable frame 2.
Since the front part of the grooved cam 14 is formed to have a large diameter with respect to the center of rotation of the grooved cam 14, when the grooved cam 14 is rotated backward, this rotation is performed in a direction opposite to the rotation of the movable frame 2. The large diameter portion of the groove hole 14a comes into contact with the pin 15 so as to bite into it, and the rotation of the groove cam 14 is prevented by strongly compressing the groove cam 14 with its rotating shaft. Therefore, the movable frame 2 is prevented from rotating downward and is held at a desired rotational position, and the thigh contact portion of the seat cushion is set and maintained at a desired support pressure by the movable frame 2.

Further, in this example, the spring 12 is stretched between the extension parts 2a' of the movable frame 2 to constitute a load bearing part, and this load bearing part receives the weight of the seated person. Instead, the load bearing portion may be constructed by disposing cloth or a plate-like body. Further, the movable frame 2 is not limited to the U-shape shown in the embodiment, but may be formed entirely of a plate. In this case, the springs 12, 12' suspended on the movable frame 2 can be omitted. Further, other configurations are not limited to those shown in this example, and various embodiments may be adopted.

As described above, the thigh support device of the present invention engages the movable frame, which is pivotally supported by the cushion frame so that it can be rotated in a folding manner, by the rotation of a cam having a slot whose radius continuously changes. Since the configuration is such that the movable frame is configured to rotate and displace via a pin that is rotated and locked by stopping the rotation of the cam, the support pressure of the seat cushion at the thigh contact area can be smoothly and steplessly adjusted by the movable frame. The support pressure can be set accurately to the desired support pressure for the seated person, and after adjustment, it is reliably locked and can withstand shock loads.
A comfortable feeling of support can always be provided to the thighs of the seated person.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing a conventional thigh support device, Fig. 2 is a partially cutaway side view showing the thigh support device of the present invention, and Fig. 3 is a partially cutaway plan view of the same. be. In the figure, 1 is a cushion frame, 2 is a movable frame, 5 is an adjustment mechanism, 14 is a grooved cam, 14a is a slot thereof, and 15 is a pin.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable frame pivotably attached to the front part of the cushion frame so as to be rotatable up and down; a cam that is correspondingly pivoted and has a slot whose radius changes continuously and greatly as the movable frame rotates in the direction of the pivoted portion; a pin that protrudes from a vertical line on the side of the pivoting part of the movable frame and is engaged with the slot of the cam, and rotates the cam in the direction of the pivoting part of the movable frame. As a result, the movable frame is rotated upward through the engagement portion between the slot and the pin, and the cam is rotated downward through the pin due to the external force of the movable frame. The movable frame is rotated in the direction of the shaft attachment part, and the large diameter side of the slot is bitten into the pin, and the movable frame is prevented from rotating downward, and the cushion is rotated. A thigh support device characterized by being locked to a frame.