JP2000135137A - Hinge mechanism of sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount the title mechanism even in a small space and to eliminate the fear of detaching a hinge arm on the side of a sheet back from a hinge pin on the side of a sheet cushion. SOLUTION: In the state of pivotally attaching the hinge arm 4 to the hinge pin 5 through a bush 1, a spacer 2 is fitted to a part positioned outside of the arm 4 of the bush 1 to integrally engage the three of the spacer 2, the bush 1 and the pin 5 to an engaging pin 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge mechanism for a vehicle seat, and more particularly, to a hinge mechanism for connecting a seat back (backrest) to a seat cushion (seat) so as to be able to lean forward.

[0002]

2. Description of the Related Art A conventional example of this type of hinge mechanism is shown in FIG.
Shown in In the figure, (6) is a hinge bracket which is integrally welded to the seat cushion frame. A hinge pin (5) is integrally fixed to the hinge bracket (6), and the hinge pin (5) is interposed through a bush (1 '). The hinge arm (4) integrally fixed to the back frame of the seat back is pivotally mounted on the hinge so as to be rotatable in the front-rear direction, and the bush (1 ') is locked to the hinge pin (5) by the locking pin (3). Have been. In the drawing, (50) indicates a through hole of the locking pin (3).

In the above conventional product, the locking pin (3) prevents the hinge arm (4) from being pulled out of the hinge pin (1 '). However, when the vehicle is suddenly stopped, a load mounted behind the seat back may hit the seat back and the hinge arm may be disengaged from the hinge pin.

In order to eliminate such a problem, a hinge pin is used as a stepped bolt and a hinge arm is inserted through the hinge arm. Then, the hinge pin is fixed to the hinge bracket side of the seat cushion side with a stepped bolt and a nut (for example, a real open flat). 2-12
No. 5173).

[0005]

When the hinge arm is attached with the above stepped bolt, the stepped bolt needs to be fastened to the nut on the hinge bracket side.

However, two seat backs are arranged side by side on a two-seat seat cushion, and the adjacent sides inside each seat back are hinged.
Since the space for fastening with stepped bolts is limited, there is a problem that the mounting workability is extremely poor.

Accordingly, the present invention provides a seat in which two seatbacks are arranged side by side and hingedly connected to a two-seat seat cushion side to improve the connectivity, and An object is to prevent the hinge arm from being detached after the connection.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, when the hinge arm is pivotally connected to a hinge pin via a bush, a spacer is provided on a portion of the bush located outside the hinge arm. And the spacer, the bush and the hinge pin are integrally locked by a locking pin.

Therefore, after attaching the bush to the hinge arm side, the spacer is fitted to the bush. Thereafter, the hinge arm is inserted into the hinge pin and locked by the lock pin, thereby connecting the hinge arms. Therefore, a large space is not required for the connection operation.

[0010] Preferably, a locking projection for preventing the spacer from being removed is provided on the outer periphery of the distal end portion of the bush, so that the hinge arm does not come off the hinge pin due to the locking projection of the spacer and the bush.

The bush is provided with a convex portion on the outer peripheral surface in the axial direction, and a concave portion into which the convex portion is fitted is provided on the inner peripheral surface of the spacer. Pins can be easily inserted.

Furthermore, by providing a positioning small projection which fits into a small recess provided outside the hinge arm, the bush, the spacer and the hinge pin are positioned inside the spacer. The connection between the three members by the locking pin is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded view of an automobile seat adopting a hinge mechanism according to the present invention.
(SB) is a seat back, and each seat back (SB) is arranged in parallel with a cushion frame (70) of a seat cushion (not shown) for two.

The arms (4A) and (4A) provided outside the lower portion of each seat back (SB) are attached to the seat cushion side by a reclining device, and the hinge arms (4A) provided inside the lower portion of each seat back (SB). )
(4) is rotatably mounted on the seat cushion side by the hinge mechanism according to the present invention.

The cushion frame of the seat cushion shown in the figure has two pipes (70) and (71), and a pedestal (7) for fixing both ends of the pipes (70) and (71).
2) (73), and a reclining device is mounted on each of the pedestals (72) and (73).

At the center of the rear pipe (70), a support rod (7) obtained by bending the pipe in a U-shape is welded upward, and a hinge is attached to the support rod (7). The brackets (6) and (6) are welded, and the hinge pins (5) face each hinge bracket (6) (6).
(5) is integrally fixed.

The hinge arms (4) and (4) are pivotally mounted on the hinge pins (5) and (5) so as to be rotatable in the front-rear direction. Reference numeral (40) in the figure denotes an insertion hole for the hinge pins (5) and (5) provided in the hinge arms (4) and (4).

FIG. 2 shows a state where the hinge arm (4) is attached to the hinge pin (5). The hinge bracket (6) is covered with a synthetic resin cover member (60), and the hinge pin (5) is attached to the bush (1). ) Is attached,
The bush (1) is locked to the hinge pin (5) by a locking pin (3) together with a spacer (2) provided on the outer surface of the hinge arm (4).

The hinge pin (5) has a through hole (50) through which the locking pin (3) is inserted, and the hinge arm (4).
A small concave portion for temporarily fixing the spacer (2) is provided on the outer side surface of the spacer (2), and the small protrusion (20) provided on the side surface of the spacer (2) is engaged with the small concave portion, so that the spacer ( 2) is positioned so that the insertion hole (24) provided in the spacer (2) shown in FIGS. 3 and 5 matches the through hole (50) of the hinge pin (5).

The spacer (2) is fitted to a locking projection (12) provided on the outer periphery of the end of the bush (1), so that the spacer (2) can be prevented from coming off with respect to the bush (1) and the bush (1) can be moved in the axial direction. Is positioned at a predetermined position, so that the insertion of the locking pin (3) is improved.

FIGS. 3 to 5 show the bush (1), the spacer (2), and the locking pin (3), respectively. As shown in FIGS. 3 and 4, the bush (1) is composed of a flange (10) and a tube (11), and the slit (1A) extends from the flange (10) to the tube (11). It is formed so that it can be easily mounted in the insertion hole (40) of the hinge arm (4).

A convex portion (13) is formed integrally with the outer peripheral surface of the cylindrical portion (11) of the bush (1) in the axial direction. Are provided.

The cylindrical portion (11) is provided with through holes (14) (14) for vertically inserting the locking pin (3).

The spacer (2) is formed of a synthetic resin such as nylon similarly to the bush (1), and the projection (13) is formed in the through hole (2A) so that the spacer (2) can be mounted on the bush (1) even if it is turned upside down. The recesses (23) and (23) into which are fitted are cut out, and the small projections (22) and (22) that engage with the small recesses of the hinge arm (4) are integrally formed on both side surfaces.

The thickness of the spacer (2) is substantially the same as the thickness of the hinge arm (4), and the outer diameter of the spacer (2) is larger than the outer diameter of the flange (10) of the bush (1). ing. Therefore, the spacer (2) is configured so as not to be deformed by the twist of the hinge arm (4) or the like.
The end of the hinge arm (4) is securely supported by the spacer (2).

The spacer (2) has a substantially trapezoidal head (20A) having a circular outer periphery and a guide surface (20A) having a flat top surface integrated with the main body (21). 2
0), and as shown in FIG.
0), the through holes (24) through which the small protrusions (22) and (22) are inserted and the guide pin (20A) through which the locking pin (3) is inserted are formed. The main body below the through hole (24) is formed. (2
A through hole (24A) is provided in 1).

As the locking pin (3), a metal spring pin is used. From the through hole (24) of the spacer (2) to the through hole (14) of the bush (1), the through hole of the hinge pin (5), and the bush. The through hole (14) of (1) and the through hole (2) of the spacer (2)
4A), and each through hole (2
4) (14) (50) ... locked inside.

Next, a method of connecting the hinge arm (4) to the hinge pin (5) will be described. First, the bush (1) is installed in the insertion hole (40) of the hinge arm (4), and then the spacer (2) is fitted into the bush (1).
At this time, one of the concave portions (23) of the spacer (2) is engaged with the convex portion (13) of the bush (1).

As a result, the through holes (24), (14), (14), and (24A) of the bush (1) with the spacer (2) become straight. Then, the small protrusion (2) of the spacer (2)
2) is engaged with the small recess of the hinge arm (4).

The hinge arm (4) is so small that, for example, in a state perpendicular to the hinge pin (5), the through hole (14) of the bush (1) and the through hole (50) of the hinge pin (5) coincide. A concave portion is preset on the hinge arm (4), and a small protrusion (22) is preset on a predetermined position of the spacer (2).

Therefore, the small projections (2) of the spacer (2)
By engaging 2) with the small recess of the hinge arm (4), the through holes of the spacer (2), the bush (1), and the hinge pin (5) communicate with each other in a straight line.

Next, after the hinge pin (5) is inserted through the hinge arm (4) on which the bush (1) and the spacer (2) are mounted, the locking pin (3) is changed to the spacer (2), the bush (1), When the hinge pin (5) is inserted and locked, FIG.
As shown in the figure, the hinge arm (4) is connected to the hinge pin (5).
Are rotatably connected in the front-rear direction.

Incidentally, the hinge arm (4) is rotated by the forward and backward rotation of the seat back (SB).
The small protrusion (22) of the spacer (2) is a hinge arm (4).
Of the hinge arm (4), and comes into resilient contact with the side surface of the hinge arm (4).

[0034]

According to the present invention, the hinge arm of the seat back is connected to the hinge pin on the seat cushion side by the adjacent seat back, such as a seat for connecting two seat backs to the two-seat seat cushion so as to be able to lean forward. When the space for connecting to the seat back is narrow, there is no need to connect with bolts as in the conventional product, so that the work of connecting each seat back to the seat cushion can be facilitated and the workability can be improved.

In addition, since the hinge arm is supported by the spacer and the spacer is locked to the hinge pin together with the bush by the locking pin, there is no possibility that the hinge arm will come off the hinge pin.

The spacer is attached to a predetermined position of the bush by providing a locking projection for stopping the spacer on the outer periphery of the end of the bush, and the hinge arm is supported by the bush on one side and the spacer on the other side. You. Therefore, it is possible to prevent the hinge arm from rattling, and to prevent the hinge arm from being pulled out of the hinge pin due to the rattling of the hinge arm.

In addition, by fitting the convex portion of the bush to the concave portion of the spacer, the spacer can be mounted at a predetermined position of the bush, and the locking pin can be easily locked to the spacer and the bush.

Further, by fitting the small projection of the spacer into the small recess of the hinge arm, the positioning of the spacer and the hinge pin can be achieved, and the workability of the connection of the spacer, the bush, and the hinge pin by the locking pin can be improved. Become.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automobile seat on which a hinge mechanism according to the present invention is mounted.

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

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view of a conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bush 2 Spacer 3 Lock pin 4 Hinge arm 5 Hinge pin

Claims (4)

[Claims] 1. A seat hinge mechanism for pivotally connecting a hinge arm on a seatback side to a hinge pin provided on a seat cushion side via a bush so as to pivotally connect the seatback to the seat cushion. In a state where the hinge arm is pivotally attached to the hinge pin via the bush, a spacer is fitted to a portion of the bush located outside the hinge arm, and the spacer, the bush and the hinge pin are integrally fixed by a locking pin. A hinge mechanism for locking the seat. 2. The seat hinge mechanism according to claim 1, wherein a locking projection for retaining the spacer is provided on an outer periphery of a distal end portion of the bush. 3. The hinge mechanism for a seat according to claim 1, wherein a convex portion is provided on an outer peripheral surface of the bush in an axial direction, and a concave portion into which the convex portion is fitted is provided on an inner peripheral surface of the spacer. 4. The seat hinge mechanism according to claim 1, wherein a small positioning protrusion is provided inside the spacer to fit into a small recess provided outside the hinge arm.