JPH0643178B2 - Seat suspension locking device - Google Patents

Description

The present invention relates to a locking device for a seat suspension provided in a vehicle seat or the like.

[Conventional technology]

In a vehicle seat, particularly in a driver's seat of a truck, in order to improve the sitting comfort by absorbing vibration,
A seat suspension that elastically supports the seat is provided between the seat and the floor surface. In this seat suspension, the seat may vibrate excessively when traveling on a bad road, which may hinder the driving operation of the occupant.Therefore, various seat suspensions are equipped with a locking device that can stop the suspension function as necessary. Proposed.

As a conventional locking device for this type of suspension,
For example, there is one as disclosed in "JP-A-57-144139". That is, this suspension lock device
In a seat suspension in which an X-shaped link elastically supports an upper frame to which a seat is fixed with respect to a lower frame fixed to the floor side, a lock pin is provided on the upper frame side, and correspondingly, On the lower frame side, a lock piece having a plurality of locking recesses in the up-and-down direction is axially supported in an upright state, and a lock pin is engaged with one of the locking recesses of the lock piece to raise the height of the seat suspension. It is configured to lock in the vertical direction.

[Problems to be solved by the invention]

However, since the conventional locking device for the seat suspension is configured to lock the suspension in the bending direction of the upper frame, the locking mechanism is arranged in the thickness direction of the seat suspension. However, the locking recess of the lock piece can be formed only at a few places, so that the seat suspension can be locked only in large steps in a limited position.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a locking device for a seat suspension that can be made thinner and can be locked at an arbitrary height position.

[Means for solving problems]

In order to achieve the above object, the present invention provides a seat suspension device in which an upper frame, to which a seat is fixed, is elastically supported via a X-shaped link, with respect to a lower frame, which is fixed to a floor surface side. In the above, an engaging member having a plurality of continuous engaging teeth that horizontally move in the front-rear direction of, for example, the lower frame along with the vertical movement of the X-shaped link is formed at the sliding end of one of the X-shaped links. At the same time as mounting, a lock member is provided on the lower frame corresponding to the engaging member, the locking member being engaged and disengaged in the horizontal direction with respect to the engaging teeth of the engaging member, and the lock for operating the locking member on the outer surface of the lower frame. A switching operation unit is provided.

[Action]

 The above-mentioned means work as follows.

When the lock member is separated from the engaging teeth of the engaging member, the engaging member can slide back and forth integrally with the X-shaped link,
Therefore, when the occupant is seated, the X-shaped link operates and suspension operation is performed. When the lock member is rotated in the horizontal direction and is engaged with the engagement teeth of the engagement member, the engagement member is locked so that it cannot slide, so that the operation of the X-shaped link is stopped and the upper frame is stopped. That is, the height position of the seat is fixed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, (1) shows the whole seat suspension device, (2) is a lower frame, (3) is an upper frame,
The lower frame (2) is fixed on the floor side, and the seat cushion of the seat is fixed on the upper frame (3) .The upper frame (3) is located on the left and right sides of the lower frame (2). It is movably supported in the vertical direction by X-shaped links (4) arranged on both sides.

That is, the left and right X-shaped links (4) are constructed by pivotally connecting a pair of links (5) and (6) in a central portion thereof with a shaft (7) in an intersecting manner. The front end of one link (5) of the link (4) is connected by the front shaft (8), the rear end of the link (4) is connected by the rear shaft (9), and the front end of the other link (6) is connected by the front part. The rear ends are connected by a shaft (10) and a rear shaft (11). Both ends of these rear shafts (9) and (11) are located at the rear ends of both sides (2a) (2b) of the lower frame (2) and at the rear sides (3a) (3b) of the upper frame (3), respectively. Both ends of the front shafts (8) and (10) are respectively supported on both ends, and the front ends of both sides (3a) and (3b) of the upper frame (3) and both sides of the lower frame (2) are respectively supported. Rail members (12) and (1) having a U-shaped cross section, which are fixed to face the front ends of (2a) and (2b).
It is fitted in 3) so as to be slidable in the front-rear direction via rollers (14) and (15).

A bracket (16) is fixed to the front surface of the front shaft (8) of the link (5), and a coil spring (between the bracket (16) and the front side portion (3c) of the upper frame (3) ( 1
7) is inserted, and the elastic force of the coil spring (17) elastically biases the X-shaped link (4) in the standing direction,
Force is always applied to the upper frame (3) in the pushing up direction.

A rod (18) is laterally fixed to the center of both sides (3a) (3b) of the upper frame (3).
A shock absorber (19) is provided between the rear shaft (9) and the lower frame (2).

And the seat suspension configured in this way (1)
On the front part of the lower frame (2) of the
0) is provided.

Reference numeral (21) is a support plate on which the locking device (20) is arranged. The front portion (21a) of the support plate (21) is bent in a U shape, and the tip portion of the support plate (21) is of the lower frame (2). It is fixed to the front side of the front side (2b), and the lower support surface (21b) passes under the front side (2c) of the lower frame (2) and under the front shaft (10) of the link (6). The one end of the lower frame (2) is fixed to the lower surface of the other side (2b) of the lower frame (2).

An engaging member (22) is attached to the front end side sliding portion of the other link (6) of the X-shaped link (4) on the support surface portion (21b) of the support plate (21). That is, a hollow pipe (23) is fitted onto the front shaft (10) of the other link (6) between the links (6) on both sides in a non-slidable manner in the axial direction, and is fitted into this pipe (23). L-shaped engaging member (22)
Is fixed to the vertical surface portion thereof, and a plurality of engaging teeth (22a) continuous in the front-rear direction are formed on the edge of the horizontal surface portion of the engaging member (22).

In addition, the engaging member (22) is engaged with the dovetail-shaped guide member (24) whose horizontal surface portion is fixed to the support plate (21) in the front-rear direction, and is accompanied by the operation of the X-shaped link (4). The support plate (21) is slidable along the lever guide member (24) in the front-rear direction without shaking.

Corresponding to the engaging member (22), a substantially L-shaped lock member (25) is provided on the front portion (21a) of the support plate (21).
Is rotatably supported by a shaft pin (26) at its central bent portion so as to be horizontally rotatable. This locking member (25)
The one side portion (25a) of the lower frame (2) faces the engaging member (22) through the front side portion (2c) of the lower frame (2), and the engaging member is attached to the side edge of the one side portion (25a). Engaging tooth (22a)
) Corresponding to the above, a continuous lock tooth (25 _a1 ) is formed in the front-rear direction.

Also, on the other side portion (25b) of the lock member (25),
An operating slot (27) is formed in the longitudinal direction. This actuating slot (27) has a stepped shape in its center,
That is, the other end portion (27b) is formed so as to be bent rearward from the one end portion (27a), and the one end portion (27a) is formed.
Terminal portion of the terminal portion (27a) (27 _a1) is formed by bending slightly backwards.

Corresponding to the actuation slots (27) of the lock member (25), laterally linear guide slots (28) are formed in the upper and lower surfaces of the front portion (21a) of the support plate (21). The operation bracket (2) that is U-shaped so as to sandwich the upper and lower guide slots (28)
9) is arranged in the front part of the support plate (21), and the sliding pin (30) is attached between the upper and lower surfaces of the tip part of the operation bracket (29) and both guide elongated holes () of the support plate (21). 28) and the operating elongated hole (27) of the lock member (25) are communicated and axially supported, and the operating bracket (29) is a range in which this sliding pin (30) moves within the elongated guide hole (28). It is designed to be slid to the left and right.

Further, an elastic stopper member (31) is provided on the back surface of the front side portion of the operation bracket (29), and the operation knob (3
It is fixed by 2). This stopper member (3
1) is a cylindrical engaging portion (31a
) (31b), and corresponding to these engaging portions (31a) (31b), the front surface of the front portion (21a) of the support plate (21) is provided with engaging recesses (33a) ( 33b) is formed,
At the left and right sliding ends of the operation bracket (29), the engagement portions (31a) (31b) of the stopper member (31) are engaged with the engagement recesses (33a) (33b), respectively, so that the operation bracket (29) is It is designed to be fixedly held at that position.

Next, the operation of the lock device for the seat suspension of the present example configured as described above will be described.

Now, when the sliding pin (30) is located at one end of the guide elongated hole (28), the sliding pin (30) is located at one end of the operating elongated hole (27) of the lock member (25). The lock member (25) is rotated by being engaged with the terminal portion (27 _a1 ) of the (27a) so that the lock tooth (25 _a1 ) is separated from the engaging tooth (22a) of the engaging member (22). Is held. In this state, the operation bracket (29) is locked to the support plate (21) by engaging one engaging portion (31a) of the stopper member (31) with one engaging concave portion (33a). Sliding pin (3
0) is not unnecessarily slid (see FIG. 5A).
Therefore, the engaging member (22) is slidable in the front-rear direction. Therefore, when the occupant is seated on the seat, the X-shaped link (4) is operated to perform a normal suspension operation.

To stop the suspension operation from this state, slide the operation bracket (29) with the operation knob (32) and slide the slide pin (30) toward the other end of the elongated guide hole (28). The sliding pin (30) moves from the one end portion (27a) to the other end portion (27b) in the operating elongated hole (27) of the lock member (25) to continuously connect the front edge of the operating elongated hole (27). The locking member (25) so that the locking pin (25)
6) Rotate horizontally around the lock tooth (2)
5 _a1 ) is engaged with the engaging teeth (22a) of the engaging member (22). Even in this state, the operation bracket (29) is locked to the support plate (21) by engaging the other engaging portion (31b) of the stopper member (31) with the other engaging recess (33b). , The sliding of the sliding pin (21) is prevented, and the locked state of the lock member (25) is maintained (see FIG. 5B). As a result, the engagement member (22) is locked so that it cannot be slid, so that the operation of the X-shaped link (4) is stopped and the upper frame (3), that is, the seat height position is fixed.

When releasing the lock from this state, reverse the above operation, that is, slide the slide pin (30) on the operation bracket (29).
When the operation is returned from the other end of the guide elongated hole (28) to the other end through the sliding pin (30), the sliding pin (30) moves through the operating elongated hole (27) of the lock member (25) from the other end (27b) to one end. (27a) to continuously push the rear edge of the operating slot (27), so that the locking member (25) has its locking teeth (25a).
Is horizontally rotated so as to be disengaged from the engaging teeth (22a) of the engaging member (22), whereby the engaging member (22) becomes slidable and the seat suspension (1) is unlocked. It

In this unlocked state, the lock member (2
When the sliding pin (30) is engaged with the terminal portion (27 _a1 ) that is bent further rearward from the one end portion (27a) of the operation long hole (27) of (5), the sliding contact with the lock member (25). There is no play between the moving pin (30) and the moving pin (30), so that the lock member (25) is reliably held in the unlocked state.

The seat suspension locking device of the present example configured and operated as described above is configured so that the lock member (25) is engaged and disengaged with respect to the engaging member (22) in the horizontal direction. The device can be arranged in a small space approximately equal to the thickness of the lower frame (2), and therefore the seat suspension (1) as a whole can be made thin.

Further, the locking device for the seat suspension is constructed by engaging an engaging member (22) having a plurality of engaging teeth (22a) with a locking member (25) having a plurality of locking teeth ( _25a1 ). Since the suspension is locked, there is also an effect that the seat can be fixed at an arbitrary height position with a feeling almost stepless.

In the above embodiment, the engaging member (22) is attached to the sliding end of the link (6) of the X-shaped link (4), and the lock member (25) is arranged on the lower frame (2) side. Although an example is shown, the engaging member (22) may be attached to the sliding end of the link (5) and the lock member (25) may be arranged on the upper frame (3) side, without being limited thereto. .

Further, as the lock-type disengagement mechanism of the lock member (25), various structures can be adopted other than those using the operation elongated hole (27) and the sliding pin (30) shown in this example. It is needless to say that the present embodiment does not specify the present invention also in the above member, and various change deflections are possible.

〔The invention's effect〕

As described above, according to the device of the present invention, since the seat suspension is configured to be locked in the horizontal direction, the locking device can be arranged in a space substantially equal to the thickness of the lower frame or the upper frame,
Therefore, it can be applied to a thin seat suspension, and since the locking of this seat suspension is performed by the engagement of a plurality of continuous teeth of the lock member and the engaging member, the seat can be placed at any height position of the seated person. It has various practical effects, such as being able to be fixed with an almost stepless feeling.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a seat suspension device equipped with the device of the present invention, FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. 3 is a line taken along the line BB ′ of FIG. A sectional view, FIG. 4 is an exploded perspective view of the device of the present invention, and FIGS. 5A and 5B are explanatory views of the operation of the device of the present invention. In the figure, (2) is the lower frame, (3) is the upper frame,
(4) is an X-shaped link, (22) is an engaging member, (22a) is an engaging tooth, and (25) is a locking member.

Claims (1)

[Claims] 1. A seat suspension device in which an upper frame, to which a seat is fixed, is elastically supported via a X-shaped link, with respect to a lower frame, which is fixed to the floor side, wherein any one of the X-shaped links is provided. At the sliding end of one of the links,
An engaging member having a plurality of continuous engaging teeth that move horizontally in the front and rear of the lower frame or the upper frame in accordance with the vertical movement of the X-shaped link is attached, and the lower member corresponding to the engaging member is attached. A lock member that is engaged and disengaged in the horizontal direction with respect to the engagement teeth of the engagement member is provided on either one of the frame and the upper frame, and the lock for operating the lock member is provided on the outer surface of the frame of the upper or lower frame. A locking device for a seat suspension, which is provided with a switching operation section.