JP3015861B2 - Seat front and rear tilt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a front / rear tilt device for adjusting the height of a seat by tilting (tilting) a front portion and a rear portion of a vehicle seat.

[0002]

2. Description of the Related Art A conventional seat front-back tilt device 20
Is as shown in FIG. That is, in FIG. 6, the seat front-rear tilting device 20 includes a front rotation shaft 22 and a rear rotation shaft 23 rotatably mounted on the seat frame 21 in the left-right direction, and Link mechanisms 24 and 25 provided respectively, and link mechanism 2
The cushion frame 26 is supported by the support shafts 4 and 25 and moves up and down with the rotation of the front rotation shaft 22 and the rear rotation shaft 23, and the cushion frame 26 stops rotation of the front rotation shaft 22 and the rear rotation shaft 23. Mechanical lock machine groove 27 and rear mechanical lock machine groove 28
And tilt springs 31 and 32 which are bridged between spring hooks 29 and 30 fixed to the front rotation shaft 22 and the rear rotation shaft 23, respectively, and push up and urge the cushion frame 26 upward. ing.

Here, mechanical lock mechanisms 27, 28
Each consists of a cylinder and a piston that moves in and out of the cylinder.A coil spring is wound around the piston, and when the height of the seat is adjusted, the piston is tightened to lock the movement of the piston. This locks the position of the seat. And the front mechanical lock mechanism 2
7 and the lock release of the rear mechanical lock mechanism 28
The operation is performed by two operation levers, that is, an operation lever 35 for adjusting the front tilt mechanism and an operation lever 36 for adjusting the rear tilt mechanism via the cables 33 and 34, respectively.

[0004]

[SUMMARY OF THE INVENTION However, in the prior art, since by adjusting the seat angle to suit the seating persons with two operating levers, when the two operation levers are operated simultaneously, There is a problem that the front and rear link mechanisms become free and perform complicated operations, making it difficult to make fine adjustments and causing malfunctions.

The present invention has been made in view of the above circumstances, and has as its object to provide a seat front / rear tilt device capable of preventing malfunction.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a front rotation shaft and a rear rotation shaft rotatably mounted on a seat frame in a left-right direction, and the front rotation shaft and a rear rotation shaft. A link mechanism provided on each of the rotating shafts,
A cushion frame that is supported via the link mechanism and moves up and down with the rotation of the front rotation shaft and the rear rotation shaft, and stops the rotation of the front rotation shaft and the rear rotation shaft to fix the position of the cushion frame. A front mechanical lock mechanism and a rear mechanical lock mechanism, and a tilt spring that is bridged between spring hooks fixed to the front rotation shaft and the rear rotation shaft, respectively, and that pushes up and urges the cushion frame upward. In the seat front-back tilt device, a three-pronged operation lever member for unlocking the front mechanical lock mechanism and the rear mechanical lock mechanism via a cable is provided, and a part of the lever is controlled as an operation lever. By rotating the operation lever to the left and right, the front mechanical lock mechanism and the rear mechanical lock mechanism are moved. So as to unlock the mechanism alternately, the triple branching shaped operating lever member, the operating lever
Is located in the center of the front side of the seat, and the other
Position it so that it is located inside, and
The cables attached to each other cross each other
The front lock mechanical lock extends
Connected to the mechanical machine and the rear mechanical lock mechanism.
It is characterized in that the.

[0007]

With [act-described structure, than was to perform the release operation alternately with an operation lever for performing unlocking of the front mechanical lock mechanism and a rear mechanical lock mechanism to one, reduce the malfunction prevention it is possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of the first embodiment. In FIG. 1, since the configuration is the same as that of the conventional technology except for the operation lever, the same reference numerals are given to those portions as they are, and the duplicated description will be omitted.

A three-pronged operating lever member 1 is connected to a front frame member 4 constituting a cushion frame 26 by a pin 3 through a pin hole 4a.
It is attached so as to be able to rotate with it. In such a configuration, by rotating the operation lever 1a of the operation lever member 1, the cable 33 and the cable 34 are pulled, and the mechanical lock mechanisms 27 and 28 are alternately unlocked and the link mechanisms 24 and 25 are unlocked. The front-back tilt is operated via the switch. That is, turning the operation lever 1a in the clockwise direction (direction of arrow a) activates the front tilt. Turning the operation lever 1a in the counterclockwise direction (the direction of arrow b) activates the rear tilt. Then, by alternately moving the operation lever 1a in both directions, the front-back tilt operation can be freely adjusted from the lowermost stage to a desired position on the uppermost stage.

In the first embodiment as described above, the number of operation levers 1a is one, so that the number of parts can be reduced, and the space for moving the operation lever 1a can be reduced, so that a space-saving design can be achieved. It becomes possible. In addition, since the unification of the front and rear tilt locks does not occur due to the unification of the operation lever 1a, the front tilt,
The rear tilt can be adjusted, and malfunction can be reliably prevented.

FIGS. 2 to 4 show a second embodiment according to the present invention. In the second embodiment, only one tilt spring is used in place of the conventional two-tilt spring for front tilt and the tilt spring for rear tilt. In FIG. 3, the front rotating shaft 2 is rotated so that a rotating force for lifting the seat 5 upward is generated.
A tension spring 8 as a tilt spring to be assembled to the spring hook 6 fixed to 2 and the spring hook 7 fixed to the rear rotation shaft 23 is set.

This tension spring (tilt spring) 8
The front rotation shaft 22 rotates in the direction of d by the spring force of (2), and the front end of the seat 5 moves upward through the links 9 and 10. At this time, in order to lock the rotation of the front rotation shaft 22 so that the height can be held at an arbitrary position, the mechanical lock mechanism 27 is connected via the link 11 fixed to the rotation shaft 22.
Is set. On the other hand, the rear rotation shaft 23 rotates in the direction of e, and the rear end of the seat 5 moves upward via the link 12. Similarly, a mechanical lock mechanism 28 is set via a link 13 fixed to the rotation shaft 23 to lock the rotation of the rear rotation shaft 23 for maintaining the height. The spring force of the tension spring (tilt spring) 8 is such as to push up the seat 5 within the adjustment range (not less than the weight of the seat assembly). (The sheet is lifted up by force).

When adjusting the height of the front end of the seat 5 upward, the occupant holds the mechanical lock mechanism 2 with the hips raised.
7 is released, and the mechanical lock mechanism 27 is locked when the front end of the sheet pushed up by the tension spring 8 reaches a desired position. Further, when adjusting the height of the front end of the seat 5 downward, the occupant releases the mechanical lock mechanism 27 with the weight applied to the seat, and the front end of the seat moves downward due to the weight exceeding the spring force, so that the desired occupant's weight can be adjusted. At this point, the mechanical lock mechanism 27 is locked. Similarly, with respect to the height adjustment of the rear end of the seat 5, a desired height can be obtained by unlocking the mechanical lock mechanism 28 and applying the weight of the occupant.

The force F of the tension spring (tilt spring) 8 will be described with reference to FIG. 4. If the torque of the front rotation shaft 22 is T1 and the torque of the rear rotation shaft 23 is T2, the following is obtained. It is. T1 = Fh1cosθ1 (1) T2 = Fh2cosθ2 (2) In the equation (1), h1 is increased and θ1 is decreased to increase the torque. To reduce the torque, set the reverse. In the equation (2), to increase the torque, h2 is increased and θ2 is decreased. To reduce the torque, set the reverse.

In the above-described second embodiment, only one tilt spring (tension spring) 8 can be used for two conventional tilt springs, so that the number of parts can be reduced. It becomes possible and space saving can be achieved. Also, by changing the spring constant of the tension spring 8 and changing the link ratio (links 9, 10, 12 and spring hooks 6, 7) connected to the tension spring 8, the front-to-back push-up force is optimized. Can be set to

FIG. 5 shows a third embodiment according to the present invention. The third embodiment is an example in which the first embodiment and the second embodiment are combined. That is, in the third embodiment, only one operation lever 1a for unlocking the mechanical lock mechanisms 27 and 28 is provided, and only one tilt spring (tension spring) 8 is provided. . In such third embodiment, the reduction and space saving of additional parts is possible, it is possible to perform the prevention of malfunction <br/> reliably.

[0017]

As described above, according to the present invention, the number of operation levers for unlocking the front mechanical lock mechanism and the rear mechanical lock mechanism is reduced to one , and the release operation is alternately performed. this to achieve the the malfunction prevention
Can be .

[Brief description of the drawings]

FIG. 1 is an exploded overall perspective view of a main part of a first embodiment according to the present invention.

FIG. 2 is a schematic plan view of a main part of a second embodiment according to the present invention.

FIG. 3 is a side view of a second embodiment according to the present invention.

FIG. 4 is an explanatory side view of a second embodiment according to the present invention.

FIG. 5 is a plan view of a third embodiment according to the present invention.

FIG. 6 is an overall perspective view according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation lever member 1a Operation lever 2 Cable set bracket 5 Seat 6, 7, 29, 30 Spring hook 8, 31, 32 Tilt spring 21 Seat frame 22 Front rotation shaft 23 Rear rotation shaft 24, 25 Link mechanism 26 Cushion frame 27, 28 Mechanical lock mechanism 33, 34 Cable

Continuing from the front page (72) Inventor Kenichi Kitabayashi 3-10-10 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Hakko Co., Ltd. 38833 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60N 2/00-2/54

Claims (1)

(57) [Claims] A front rotation shaft and a rear rotation shaft rotatably attached to a seat frame in a left-right direction; a link mechanism provided on each of the front rotation shaft and the rear rotation shaft;
A cushion frame supported via the link mechanism and moving up and down with the rotation of the front rotation shaft and the rear rotation shaft; and stopping the rotation of the front rotation shaft and the rear rotation shaft to fix the position of the cushion frame. A front mechanical lock mechanism and a rear mechanical lock machine groove, and a tilt spring that is bridged between spring hooks fixed to the front rotation shaft and the rear rotation shaft, respectively, and pushes up and urges the cushion frame upward. In the front / rear tilt device provided with a seat, a three-pronged operation lever member for unlocking the front mechanical lock mechanism and the rear mechanical lock mechanism via a cable is provided, and a part thereof is controlled as one operation lever. The front mechanical lock mechanism and the rear mechanical lock mechanism The click mechanism so as to unlock alternately, the triple branching shaped operating lever member, the operating lever Sea
Is located in the center on the front side of the
So that they are positioned
The cables to be attached
Linearly extending, the front mechanical lock mechanism and the rear
A front-back tilt device connected to a side mechanical lock mechanism .