JPH0532045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vehicle or indoor vehicle equipped with a backrest.
This invention relates to an improvement of a device for adjusting the longitudinal inclination of a seat in a passenger seat.

In general, especially for high-end seats equipped with a backrest, the inclination angle of the seat in the longitudinal direction can be adjusted within a certain range to allow the seating position to be changed according to the usage conditions or the preferences of the seated person. Adjustable devices, so-called longitudinal tilt adjustment devices, have been widely adopted, but in conventional adjustment devices,
When changing the tilt position, the operating direction of the control lever is constant in one direction, which is a so-called unidirectional operation method. Therefore, in order to change the inclination angle of the seat, you must operate the lever and use the force of your legs, hips, and back. It is necessary to apply force, the operation is complicated, and there are disadvantages in that an ergonomically unreasonable force relationship occurs in one of the movement strokes of the see-saw movement of the seat.

The present invention has been made in view of the problems of the conventional techniques, and its purpose is to provide a simple one-handed method that does not require the use of the strength of the legs, hips, or back. To provide a seat longitudinal inclination adjustment device which is easy to use and allows the inclination posture of a seat part to be arbitrarily changed by simply operating a two-way lever.

Hereinafter, the configuration of the seat longitudinal inclination adjustment device of the present invention will be described in detail from the first embodiment to the sixth embodiment shown in the figures.

1 and 2 show a first embodiment of the present invention, in which 1 and 2 are the seat and backrest of the seat, 3 is a pedestal disposed below the seat 1, 4 is a virtual center of gravity that combines the seat part 1, the backrest 2, and the seated person;
5 and 5' are pressure receiving metal fittings fixed to the bottom surface of the seat 1, 6 and 6' are support bases fixed to the upper surface of the pedestal 3, respectively, and the pressure receiving metal fittings 5 and 5' are connected to the horizontal pivot 7,
They are each pivotally connected to the support bases 6 and 6' via 7'.
In other words, the seat 1 is connected to the base 3 located below via the pivot shafts 7, 7' at its relatively rear portion, and its front end is supported so as to be able to swing up and down. The front and back positions of the pivots 7, 7' when viewed from the side are set below the virtual center of gravity 4 or points located at relatively short distances before and after the virtual center of gravity 4. Note that the pivots 7 and 7' are 1 due to design reasons.
You can also replace it with the thread of a book.

8 is a supporting base fixed to the upper surface of the front end of the pedestal 3;
1 is a bell crank whose fulcrum part is pivotally connected to a support base 8.
Reference numerals 0 and 11 are connecting metal fittings fixed to the front and rear ends of the bottom of the seat 1, respectively, and 12 is a conventionally known lock body disposed between the seat 1 and the pedestal 3 facing forward and backward, and has a lock function. By releasing it, its entire length can be expanded or contracted. 13 is the connecting fitting 11
The front end of the lock body 12 is movably connected to the lower end of the connecting fitting 10 via the bell crank 9, and the rear end is directly connected to the flange of the movable washer 13. The seat part 1 is kept fixed at all times. 14 is the lock body 1
Release pin for releasing the lock function of 2, 15
is a release lever for transmitting operating force to release the lock function by pushing the release pin 14 against the repulsive force thereof, and the release lever has a supporting point at the upper end that rotates with respect to the movable washer 13. The control cables 16 are movably connected, the middle part abuts the release pin 14, and the lower end part is connected to the inner cable of the control cable 16, thereby forming a locking mechanism for adjusting the inclination angle of the seat part 1.
Further, the lower end of the release lever 15 and the flange portion of the movable washer 13 form an input end of the lock mechanism.

In this embodiment, the connecting fitting 11 is fixed to the bottom of the seat 1, but due to design reasons,
Even if the shape is changed and it is moved to the rear end of the pedestal 3, there is no problem in terms of the structure of the invention.

Further, in this embodiment, the lever mechanism for releasing the lock function of the lock body 12 is constructed at the terminal part of the lock body 12, but depending on the structure of the lock body, the lever mechanism may be located along the outer periphery of the central part of the lock body. In other words, the present invention may be implemented in such a manner that the input end of the lock mechanism is located at the center of the lock body.

In this embodiment, the front end side support structure of the seat part 1 is made of a one-point support structure, but due to design reasons, the connection structure using the bell cranks 9 is changed to a pair of left and right bell cranks, and The pivot 17 connecting the crank 9 and the lock body 12 can be extended to form a long shaft, and both ends of the shaft can be connected to the left and right bell cranks 9, respectively, thereby changing the structure to a so-called two-point support structure. .

Next, 18 is an operating shaft rotatably mounted on the bottom of the seat 1 near the right side, 19 is an operating lever directly connected to the right end of the operating shaft, and 20 is the operating shaft 1.
8, a swing pin 21, 21' is a pair of levers rotatably fitted to the operating shaft 18, and 22 is arranged in the front-back gap below the levers 21, 21'. The stopper is fixedly supported by the seat part 1, and the outer and inner cables of the control cable 16 are connected to the lower ends or output ends of the levers 21, 21', respectively, while the swing pin 20 is connected to the lever 21, 21'. 21, 21', and is always in contact with the levers 21, 21', so that the swinging position is stabilized, and accordingly, the posture of the operating lever 19 is always maintained constant, and this operation An example motion conversion mechanism is constructed. The operating direction of the operating lever 19 can be freely operated diagonally upward and downward, and the levers 21, 2
1' is formed so that the attachment form is X-shaped, and no matter which direction the operating lever 19 is moved, a relative displacement occurs at the lower ends of the levers 21 and 21', and this relative displacement causes the control cable 16 to A function in which this is driven, that is, a two-way operation function is configured. Also, the operating lever 19
The position of the operating end shall be provided on the front end side of the seat portion 1 or on the side surface side relatively close to the front end, and the position of the motion conversion mechanism, the shape of the operating lever 19, etc. are set to satisfy this requirement. The basic attachment position of the motion conversion mechanism may be set on either the left or right side of the seat portion 1 depending on the application.

Next, the operation of the first embodiment will be described.
The figure shows a case where the front and back inclination angle of the seat part 1 is a standard angle, and the lock body 12 is in a locked state. To change the tilted posture of the seat 1 to a forward-upward position, by pulling up the operating end of the operating lever 19 diagonally upward, that is, in the direction of arrow P, the operating shaft 18 rotates counterclockwise and the swing pin 20 also rotates counterclockwise.
The upper end of the lever 21' receives the pressing force caused by the rotation of the swing pin 20, and rotates counterclockwise to a certain position. However, the lever 21' is prevented from moving because it comes into contact with the stopper 22. 21' causes a relative displacement with respect to the lever 21, that is, the lower longitudinal distance between the two levers is expanded, and therefore a driving force is supplied to the control cable 16. At the same time, the lower end of the release lever 15 of the lock mechanism
The lock body 12 moves forward by the driving force and pushes the release pin 14 forward to release the lock function of the lock body 12. When the lock function is released, the front end of the seat 1 becomes vertically movable, so that it floats upward due to the operating force applied to the operating lever 19, changing the tilted posture of the seat 1 to a forward-upward position. In this case, the entire length of the lock body 12 is extended, and the bell crank 9 changes to a counterclockwise rotation position within a certain range. When you release your hand from the operating lever 19 in this state, the repulsive force of the release pin 14 pushes the release lever 15 back to its original position, and at the same time, a reverse driving force is transmitted from the control cable 16 to return the operating lever 19 to its original position. do. Thereafter, the locking function of the lock main body 12 is restored, and the seat portion 1 is fixedly installed in an inclined position with the tilted position rising forward. Furthermore, when changing the tilted posture of the seat part 1,
The posture of back support 2 also changes in a related manner.

When changing the tilted posture of the seat 1 to tilt forward,
When the operating end of the operating lever 19 is pushed down diagonally, that is, in the direction of arrow Q, the operating shaft 18 rotates clockwise and the swing pin 20 also pivots clockwise.
The upper end of the lever 21 receives the pressing force caused by the rotation of the swing pin 20 and rotates clockwise to a certain position, and the lever 21' is prevented from moving by contacting the stopper 22, so that the lever 21, 21', the locking function of the lock body 12 is released in the same manner as described above, and the tilted posture of the seat portion 1 can be changed to a forwardly downward tilted position. In this case, the overall length of the lock body 12 is reduced, and the bell crank 9 changes to a clockwise position within a certain range. When the user releases the operating lever 19, the locking function of the lock main body 12 is restored in the same manner as described above, and the seat portion 1 is fixed in a tilted position.

Since the present invention is configured as described above, it has the following effects.

(1) A motion conversion mechanism equipped with a pair of levers that generates relative displacement when the operating lever is moved either upward or downward, and that relative displacement drives the control cable. Because it is attached, by bidirectional operation of the operating lever,
It is possible to cancel the lock function and change the tilt position of the seat. In addition, since the operating end of the operating lever is provided on the front end of the seat or on the side relatively close to the front end, that is, in a mechanically convenient position around the seat, operating the lever is extremely easy. be. Furthermore, since the direction of operation of the control lever is relatively close to the direction of movement of the front end of the seat, there is no risk of making a mistake in the direction of operation.

(2) A horizontal axis is provided below the virtual center of gravity of the seat, backrest, and seated person, or a point located at a relatively close distance before and after the virtual center of gravity, and the seat is compared through that axis. Since the rear part of the target is connected to the pedestal,
The weight is well balanced, and the seat can easily move up or down. Therefore, when the lock function is released and the front end of the seat is able to swing up and down, the slightest operating force applied to the operating lever will automatically cause the upper body to lean backwards or forwards.
The inclination position of the seat can be easily changed to raise the front or lower the front. Therefore, there is no need for redundant operating force such as exerting force on the legs, hips, and back in addition to operating the lever.

(3) A locking mechanism is installed between the bottom of the seat and the pedestal, which releases the locking function by pressing the release pin against the repulsive force. After changing the tilted posture of the lever, simply release the operating lever, and the operating lever will return to its original position and lock due to the repulsive action of the release pin transmitted via the release lever and the control cable. Functions will also be restored. Therefore, with one action of the operating lever, the three steps of canceling the lock function, changing the tilted posture of the seat, and restoring the lock function can be carried out at once, providing excellent usability.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the seat longitudinal inclination adjustment device according to the present invention, and FIG. 2 is a side view thereof. 1... seat, 2... backrest, 3... pedestal, 4...
Virtual center of gravity, 7, 7'... Pivot, 12... Lock body, 14... Release pin, 15... Release lever,
16...control cable, 19...operation lever, 21,2
1'...A pair of levers.

Claims (1)

[Scope of Claims] 1. A seat longitudinal inclination adjustment device that allows the longitudinal inclination angle of the seat of a vehicle or indoor seat equipped with a backrest to be adjusted arbitrarily within a certain range, A horizontal pivot is provided below the virtual center of gravity of the seat, the backrest, and the seated person, or a point located at a relatively close distance before and after the virtual center of gravity, and via that pivot, the center of gravity of the seat is The relatively rear part is connected to the pedestal located below, and the front end of the seat can swing up and down, and there is also a space between the bottom of the seat and the pedestal that can expand and contract in its entire length by releasing the lock function. a lock body, a release pin for releasing the lock function of the lock body, and a release lever for transmitting the operating force for releasing the lock function by pressing the release pin against the repulsive force of the release pin. A locking mechanism is provided, and the front end side of the lock body is movably connected to the front bottom side of the seat so that the seat can be held in a fixed state at all times, and the seat At the bottom of the movement converter, there is a pair of levers that generate a relative displacement when the operating lever is moved in either the upward or downward direction, and the relative displacement drives the control line. A mechanism is provided, and the operating end of the operating lever is provided on the front end side of the seat portion or on a side surface relatively close to the front end, and further, the output end of the pair of levers and the release lever are connected by the control cable. A seat longitudinal inclination adjustment device characterized by comprising: