JP2575654Y2 - Center seat structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a center seat (seat) mounted on a truck or the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, this type of center seat often has a seat back (SB) folded forward and folded on a seat cushion (SC). that time,
The seat back (SB) folded on the seat cushion (SC) swings (rattles) in the vertical direction due to vibration or the like while the vehicle is running. In order to eliminate such a problem, in the conventional product, the belt (5) provided on the seat back (SB) is hung on the seat cushion (SC) to prevent the seat back (SB) from swinging.

However, as described above, the center seat is used as a seat by folding the seat back (SB) on the seat cushion (SC) or by erecting the folded seat back (SB). Since the operation is often repeated, it is necessary to hang or remove the belt each time, and the operation is troublesome. Then, this invention aims at eliminating such a defect of the conventional product.

[0004]

A center seat according to the present invention for achieving the above object is constructed by connecting an inverted U-shaped back frame of a seat back to a cushion frame of a seat cushion so as to be forwardly movable. In the center seat, an upper bracket rotatably pivotally attached to the lower bracket of the cushion frame is fastened to the free end of the back frame, and the left and right upper brackets are integrally connected by a plate-shaped reinforcing plate. And an end of a torsion bar for urging a seat back forward between the cushion frame and the cushion frame, and the torsion bar is supported on a front side of the reinforcing plate.

[0005]

[Function] Since the seat back is urged forward by the torsion spring, when the lock is released,
The seat back is moved forward by the elasticity of the torsion spring. Since the forward leaning state is maintained by the elasticity of the torsion spring, the seat back does not swing due to vibration during traveling.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a frame structure of a center seat according to the present invention, wherein (1) is a torsion spring, (2) is a locking device, (3) is a cushion frame of a seat cushion, and (4) is a seat back. Each shows a back frame.

The back frame (4) is connected to the cushion frame (3) by a hinge so as to be able to move forward, and the cushion frame (3) is formed by bending a metal pipe into a frame shape and is attached to the vehicle floor. Legs (31) (31)
Has been fixed through. (3a) in the figure shows a rear frame member of the cushion frame (3).

The back frame (4) is formed by bending a metal pipe in a substantially inverted U-shape similarly to the cushion frame (3), and the lower ends of the cushion frame (3) are provided at both free ends thereof. Upper brackets (22) and (22) rotatably connected to the upper and lower brackets (23) and (23) are integrally fastened to each other, and the left and right upper brackets (22) and (2).
2), a plate-shaped reinforcing plate (41) is integrally provided between them.

As shown in FIGS. 1 and 2, the reinforcing plate (41) is disposed so as to face forward when the back frame (4) is upright, and the central portion (41c) projects forward. The bent portions (41b) (41b)
b) is provided. Further, locking claws (4) are provided on the left and right sides on the front side of the central portion (41c) of the reinforcing plate (41).
1a) and (41a) are formed. The torsion spring (1) is hooked on the one bent portion (41b) and the left and right locking claws (41a) (41a) of the reinforcing plate (41), and the torsion spring (1) is provided.
Are supported along the front side of the reinforcing plate (41).

As shown in FIG. 2, the torsion spring (1) has one end (11) on the rear frame member (3a) of the cushion frame (3) and the other end (12) on the reinforcing plate (4).
1) are respectively hooked on the bent portions (41b), and the centers are locked by the locking claws (41a) (41a). And
Both ends (11) of the above torsion spring (1)
(12) is disposed above and below the extension of the pivot pin (24) that rotatably hinges the upper bracket (22) to the lower bracket (23).

FIG. 3 shows an example of the lock device (2). A locking notch (22a) is formed at the lower end of the one upper bracket (22), and the cushion notch (22a) is formed in the locking notch (22a). ) Side, the locking pin (21) of the operation lever (21) pivotally attached by the pin (21b).
By engaging a), the back frame (4) is structured to hold the upright state. The operation lever (2
The locking pin (21a) of 1) is urged by a spring (not shown) in the engaging direction of the locking notch (22a). Therefore, when the operation lever (21) is turned in the direction of the arrow,
The back frame (4) is moved forward in the direction of the arrow by the elasticity of the torsion spring (1).

The seat back which has been moved forward on the seat cushion is held in the forward-moved state by the elasticity of the torsion spring (1) and does not swing up and down (no backlash). In order to raise the seat back, when the seat back is raised against the elasticity of the torsion spring (1), the locking pin (21a) is locked by the locking notch (22).
a) is engaged and locked at a fixed inclination angle.

[0013]

According to the present invention, a torsion spring is disposed between a seat back and a seat cushion in a center seat, whereby the seat back is automatically moved forward by the elasticity of the torsion spring, and the seat is moved forward. It is possible to prevent the back of the seat from leaning back while the seat back is folded forward on the seat cushion while the seat is held forward. Therefore, it is not necessary to attach or detach the belt each time the seat back is moved forward or whenever the seat back is moved from the forward-leaved state to the upright state as in the related art. In addition, when the seatback in the forward tilted state is to be erected, the elasticity of the torsion spring works with a moderate sense of resistance, so that it is easy to return to the original upright state without tilting the seatback backward.

Further, in the present invention, upper brackets are respectively connected to both ends of a substantially U-shaped back frame, and the left and right upper brackets are connected by a reinforcing plate, and a torsion bar is supported on the front side of the reinforcing plate. Then, the end of the torsion bar is hooked between the reinforcing plate and the cushion frame. Therefore,
Since the torsion bar is supported along the inside of the reinforcing plate, the reinforcing plate not only serves as a reinforcing member for the substantially U-shaped back frame, but also serves as a protective member for the torsion bar, preventing deformation and damage of the torsion bar. Thus, the seat back can be reliably biased forward.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a plan view showing a main part of the present invention.

FIG. 3 is a front view showing an example of the lock device of the present invention.

FIG. 4 is a perspective view showing a folded state of a conventional center sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torsion spring 2 Locking device 3 Cushion frame of seat cushion 4 Back frame of seat back

Claims (1)

(57) [Scope of request for utility model registration] An upper bracket pivotally attached to a lower bracket of a cushion frame in a center seat having an inverted U-shaped back frame of a seat back connected to a cushion frame of the seat cushion so as to be capable of being tilted forward. To the free end of the back frame, the left and right upper brackets are integrally connected by a plate-like reinforcing plate, and the end of the torsion bar for urging the seat back forward between the reinforcing plate and the cushion frame. A center portion of the center sheet, wherein the torsion bar is supported on a front side of the reinforcing plate.