JP2576848Y2 - Car seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile seat in which a seat cushion is mounted so that the seat back can be inverted with the seat back forward.

[0002]

2. Description of the Related Art A vehicle seat 100 of this kind operates as shown in FIGS. FIG. 8 shows a normal use state. The front portion of the seat cushion 101 is pivotally supported by a mount bracket 11 fixed to the vehicle floor 20 via an arm bracket 10 fixed to the cushion frame, and the rear portion is connected to the cushion frame. The fixed lock bracket 12 is locked by the striker 13 fixed to the vehicle floor 20 to maintain the use state. In this use state, the seat back 102 is in an upright state to support the back of the occupant.

When the vehicle seat 100 is not in use, the seat cushion 101 is stored with the seat cushion 101 upside down.
Can be widely used (see FIG. 11). In order to make the automobile seat 100 inverted, the following is performed. First, as shown in FIG. 9, the seat back 102 is brought forward. Next, the locked state of the striker 13 is released, and the rear portion of the seat cushion 102 is gripped and lifted in the direction of the arrow. By this lifting, the seat 100 can be brought into the inverted state in FIG. 11 around the pivot portion 14 at the front of the seat cushion 101 as the center of rotation.

[0004] Such a vehicle seat 100 is usually provided with a torsion spring (not shown) for urging the seat cushion 101 to turn in the inverted direction at a pivot portion 14 in front of the seat cushion 101. In this case, when the striker 13 is unlocked, the rear portion of the seat cushion 101 jumps up to the inclined state shown in FIG. 10, and can be further raised from the inclined state to the inverted state shown in FIG.

[0005]

However, in the conventional automobile seat, there is no mechanism for loosening or locking the rotation of the seat cushion in the opposite direction to the inverted direction, so that the seat back is moved from the inverted state (FIG. 11). If the hand is inadvertently released, such as when the restoration operation is performed up to the forward leaning state (FIG. 9), or when the lifting operation is further performed from the inclined state (FIG. 10), the seat 100 is impactably rotated in the opposite direction. As shown in FIG. 12 and FIG. 13, there is a large possibility that the luggage 103 placed on the vehicle floor, the feet of the occupant in the rear seat, and the like may be damaged, which is a safety defect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a folding and flippable automobile seat having a function of loosening or locking the above-mentioned turning in the inverted direction. It is an object of the present invention to provide a vehicle seat that secures operational safety when storing and restoring a vehicle.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention pivotally supports a seat cushion in an upright manner via an arm bracket and a mount bracket fixed to a seat cushion frame and a vehicle floor, respectively. In a vehicle seat provided with a spring for urging a seat cushion in an inverting direction on a support portion, the pivot portion includes a movable shaft attached to an arm bracket so as to rotate integrally therewith, and a fixed shaft fixed to a mount bracket. Are arranged in series on the same axis, and a coil spring for braking the rotation of the seat cushion in the inverted direction is hung on the movable axis and the fixed axis in a close state. And the hook on the other end against the mount bracket, and the coil part on the pivot. It is characterized by being attached is.

[0008]

The coil spring suspended on the movable shaft and the fixed shaft expands in diameter by rotation of the movable shaft accompanying rotation of the seat cushion in the inverted direction, and contracts in diameter by rotation of the movable shaft in a direction opposite to the above-described direction. The seat cushion is turned in the inverted direction when the frictional force between the movable shaft and the coil spring is reduced and the seat cushion is turned with a small external force. In the rotation, the frictional force between the movable shaft and the coil spring is increased, and the rotation can be performed in the same direction only by an external force exceeding the frictional force.

Further, since the coil for urging the seat cushion in the inverted direction is mounted by extrapolating the coil portion to the pivotal support portion, the spring has a multiple structure with a movable shaft, a fixed shaft, and a coil spring suspended on both of these shafts. To save the installation space.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 shows a vehicle seat 1 according to the present invention.
The main part of is shown. The seat 1 has an arm bracket 10 and a mount bracket 1 in which a front portion of a seat cushion 101 is fixed to a cushion frame 15 and a vehicle floor 20, respectively.
1, a torsion coil spring 5 for flipping up the seat cushion 101 in the inverted direction (direction a) is attached to the pivoted portion 14 so as to be rotatable around the pivoted portion 14 in the inverted direction. Installed. The seat 1 in FIG. 1 shows a usage state corresponding to FIG. 9 of the conventional seat 100 described above, and the rear part of the seat 1 is the conventional seat 10.
Similarly to the case 0, a lock bracket (not shown) fixed to the cushion frame is fitted and locked to a striker (not shown) fixed to the vehicle floor 20.

At this time, as shown in FIG. 2, the pivot portion 14 is provided with a stepped bolt 17 penetrating through the arm bracket 10 and the mount bracket 11, and a bolt 17
A movable shaft 2 which is externally mounted on the shaft portion 17a and is attached so as to rotate integrally with the arm bracket 10, and a mount bracket 11 which is externally mounted on the shaft portion 17a in series with the movable shaft 2.
And a coil spring 4 extrapolated so as to be suspended in close contact with the movable shaft 2 and the fixed shaft 3.
It is roughly composed of At this time, the mount bracket 11 is assembled so that its side walls 11a and 11b are located inside the side walls 10a and 10b of the arm bracket 10, and the stepped bolt 17 is attached to its shaft portion 17a.
Penetrates the side walls 10a, 11a, 11b, and 10b, and is attached by screwing a nut 18 to the tip screw portion 17b.

The movable shaft 2 and the fixed shaft 3 are formed in a cylindrical body having the same outer diameter and inner diameter as shown in FIG. 4, and parallel cut portions 2a, 2a, 3a are formed. The movable shaft 2 and the fixed shaft 3 are connected to the arm bracket 1 by the parallel cut portions 2a and 3a.
0 and the side wall 11 of the mount bracket 11
By being fitted into each of the non-circular holes b, they are integrally fixed to the arm bracket 10 and the mount bracket 11, respectively. At this time, the other side walls 10b and 11a of the arm bracket 10 and the mount bracket 11 have a structure in which they are fitted into the threaded portion 17b of the stepped bolt 17 and the spacer 6 described later, respectively.

The coil spring 4 is wound so that the inner diameter of the coil spring 4 is smaller than the outer diameters of the movable shaft 2 and the fixed shaft 3 in a free state.
Is extrapolated to After the extrapolation, the coil spring 4 is attached with its hook portions 4a and 4b at its free ends and its coil portion 4c in close contact with the movable shaft 2 and the fixed shaft 3. At this time, as shown in FIG. 3, the coil spring 4 expands when the movable shaft 2 rotates in the direction TS, which is the rotation direction when the seat cushion 101 is rotated in the inverted direction.
When the movable shaft 2 rotates in the TL direction, which is the rotation direction when the seat cushion 101 is rotated in the direction opposite to the inverted direction, the winding direction is determined so as to reduce the diameter. The torque required for the rotation of the movable shaft 2 in the TS and TL directions is a slip torque and a lock torque, respectively, and the rotation of the movable shaft 2 in each direction is only possible if the torque exceeds the above-mentioned respective torques. At this time, since the slip torque is extremely small as compared with the lock torque, the rotation of the movable shaft 2 in the TS direction can be performed with a small external force as compared with the rotation in the TL direction. Further, as shown in FIG. 4, the coil spring 4 is extrapolated so that the number of turns is smaller on the movable shaft 2 side than on the fixed shaft 3 side, so that the tightening force is smaller on the movable shaft 2 side than on the fixed shaft 3 side. ing. For this reason, the coil spring 4 is integrated with the fixed shaft 3 irrespective of the rotation of the movable shaft 2, and only the movable shaft 2 slips with the coil spring 4, and T
It turns in the S or TL direction. Further, the hook 4a of the coil spring 4 on the movable shaft 2 side is formed so as to be separated from the outer peripheral surface of the movable shaft 2 as shown in FIGS. And the edge of the hook 4a is prevented from damaging the outer peripheral surface of the movable shaft 2, thereby stabilizing the operation.

In FIG. 2, reference numerals 6, 7, and 8 denote spacers. In particular, the spacers 6 and 7 are externally mounted on the movable shaft 2 and the fixed shaft 3, respectively. I am trying to be stable. In FIG. 2, reference numeral 9 denotes a guide pipe, both ends of which are supported by spacers 6 and 7 and are concentrically mounted outside the coil spring 4.

The pivot 14 is assembled as described above. The torsion coil spring 5 is assembled to the pivot 14 as follows. That is, as shown in FIG. 2, the torsion coil spring 5 has its coil portion 5a concentrically inserted outside the guide pipe 9, one end hook portion 5b thereof abutting on the arm bracket 10, and the other end hook portion. 5c is attached to the mounting bracket 11 by abutting it (see FIG. 1).

The automobile seat 1 configured as described above.
Works as follows. First, after the seat back of the seat 1 in use is brought forward (see FIG. 10), the lock of the rear portion of the seat cushion 101 by the striker is released. With this release, the seat 1 is flipped up around the pivot 14 by the torsion coil spring 5, and the rear portion of the seat cushion 101 is tilted up (see FIG. 11). From this inclined state, the seat cushion 1
By rotating 01 in the same direction, the seat 1 can be stored in an inverted state (see FIG. 12). The rotation of the seat 1 through the inclined state until the seat 1 reaches the inverted state is performed by moving the movable shaft 2 through the arm bracket 10 in the TS direction (FIG. 3).
2), the tightening torque by the coil spring 4 becomes a slip torque and does not cause a high load.

When the seat 1 is restored from the inverted state to the used state, the movable shaft 2 rotates in the TL direction, and the tightening torque by the coil spring 4 becomes the lock torque. The lock torque can be designed to have various sizes depending on the wire diameter of the coil spring 4, the number of turns around the movable shaft 2, and the like. The seat 1 can be loosened in the same direction by its own weight, or rotated by an external force load exceeding the lock torque. Then, it can be stopped in an inclined state at an arbitrary position by releasing the external force load.

As described above, according to the seat 1, the load in the inverted direction is not increased, and the seat 1 can be operated with substantially the same operating force as that of the conventional seat, and the rotation in the inverted direction is slowed down or stopped at an arbitrary position. As a result, it is possible to prevent shocking rotation and to ensure safety for the occupant or the load.

The present invention can be applied not only to the second seat which sits forward as in the seat 1 described above but also to the third seat which sits sideways as shown in FIG. That is, the third seat 20 is rotatably mounted around the pivot 14 of the arm bracket 10 and the mount bracket 11, and the pivot 14 at this time has the same structure as the seat 1 described above, and Like the seat 1, the torsion coil spring 5 is provided on the pivot portion 14. As shown in FIG. 6, the third seat 20 can be stored in an inverted state with the seat back turned forward as in the case of the seat 1, and at this time, the rotation in the inverted direction can be loosened or locked. Operational safety is ensured, and the mooring work can be performed with both hands in the inverted state of the seat 20 as shown in FIG.

[0020]

As described above, the present invention is capable of performing the turning in the inverted direction with substantially the same operating force as the conventional seat, and has a function of loosening or locking the turning in the inverted direction. As a result, the operational safety and efficiency in storing and restoring the seat can be improved.

Further, in the present invention, the spring for lifting the seat is assembled concentrically with the pivot portion having the function of loosening or locking the seat, so that the size of the entire mechanism can be designed to be compact. The installation space was saved.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a vehicle seat according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing an assembled state of a movable shaft, a fixed shaft, and a coil spring externally mounted on both shafts constituting a pivot portion of the vehicle seat of FIG. 1;

FIG. 4 is a longitudinal sectional view of an assembled state of FIG. 3;

FIG. 5 is a bottom view of the assembled state of FIG. 3;

FIG. 6 is a side view showing an inverted state of another embodiment of the present invention.

FIG. 7 is a side view of another embodiment of FIG. 6 in an inverted and moored state.

FIG. 8 is a side view of a conventional automobile seat in use.

9 is a side view of the vehicle seat of FIG. 8 in a state where the seat back is tilted forward.

FIG. 10 is a side view showing an inclined state when the automobile seat of FIG. 8 is flipped up.

FIG. 11 is a side view showing an inverted state of the vehicle seat of FIG. 8;

FIG. 12 is a side view showing the operation of the automobile seat of FIG. 8;

FIG. 13 is a side view showing the operation of the automobile seat of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 20 Automotive seat 2 Movable shaft 3 Fixed shaft 4 Coil spring 5 Torsion coil spring (spring) 5a Coil unit 10 Arm bracket 11 Mount bracket 14 Pivot support 15 Seat cushion frame 20 Car floor 101 Seat cushion

Claims (1)

(57) [Scope of request for utility model registration] 1. A seat cushion is pivotally supported by an arm bracket and a mount bracket fixed to a seat cushion frame and a vehicle floor, respectively, and a spring for urging the seat cushion in the inverted direction is provided at the pivot. In the vehicle seat, the pivot portion, a movable shaft attached to the arm bracket so as to rotate integrally, and a fixed shaft fixed to the mount bracket are arranged in series on the same axis, and this movable shaft and A coil spring for braking the rotation of the seat cushion in the upside-down direction is hung on the fixed shaft in close contact, and the spring abuts one end of the hook portion to the arm bracket and the other end to the mount bracket. And a coil part is mounted by being extrapolated to the pivot part. Door.