JPH0411555Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hinge device for a vehicle seat, and in particular, it is capable of bending the seat bag forward approximately parallel to the seat cushion, while also allowing the seat bag to be pushed back and fully flat. The present invention relates to a possible hinge device.

[Conventional technology]

Generally, in a seat for a vehicle such as an automobile, a seat cushion and a seat back are connected through a reclining device and a hinge device so that the seat back maintains a predetermined or desired inclination angle. In order to make effective use of the interior of the vehicle, the seat bag of unoccupied seats can be folded in two stages, like folding over the seat cushion, while the seat bag and seat cushion can be pushed backwards to become fully flat, thereby improving the interior of the vehicle. A configuration that can be used as a pet space is known.
This configuration consisted of a pair of reclining devices attached to both left and right sides of the seat cushion.

[Problem that the invention attempts to solve]

However, a reclining device in which the seat bag is folded over the seat cushion or both are fully flat has a complicated structure and is expensive due to problems in assembly and manufacturing. Therefore, in order to solve this problem, it is a good idea to replace one of the left and right reclining devices with a hinge device, and hinge devices for this purpose are also being provided. However, in this type of hinge device, the upper arm and the lower arm, which are configured to be foldable in two stages, do not have a locking mechanism, so the positions of both are maintained by the force of a coil spring. Therefore, when folding the seat bag onto the seat cushion, the upper arm and the lower arm are folded in two steps against the force of the coil spring, so that when the seat bag is folded in two steps to the maximum, the force of the coil spring is also maximized. Consequently, depending on the relationship between the force of the coil spring and the weight of the seat bag, the seat bag may naturally rise up, resulting in an inconvenience. In particular, since a vehicle generates vibrations when the vehicle is running, there are problems such as the possibility that the seat back may flip up due to the vibrations.

[Means for solving problems]

The present invention aims to provide a hinge device that solves the above-mentioned problems, and includes a pair of lower arms that are rotatably connected to each other by sandwiching a base plate that is connected to a seat cushion, and one of the lower arms. It has an upper arm rotatably connected to the seat back, and a coil spring loaded between the upper arm and the one lower arm, and the seat pack can be folded over the seat cushion or laid flat. In the hinge device for a vehicle seat, the coil spring is loaded so that when the seat bag is folded onto the seat cushion, its center line is located on the pivot portion of the upper arm and the lower arm. This is a seat hinge device.

[Effect]

According to the above structure of the present invention, when the seat bag is folded on the seat cushion, the upper arm and the lower arm are respectively bent and the upper arm is folded in two stages substantially parallel to the base plate. Since the center line of the coil spring elastically loaded between the seats is located on the pivot portions of both seats and serves as a dead point, no rotational torque in the upright direction is generated in the seat back. When the seat bag is raised up, rotational torque is generated that acts as a restoring force, making the operation easier and faster.

〔Example〕

The present invention will be explained below based on an illustrated embodiment.

FIG. 1 is a front view, and FIGS. 2 and 3 are action explanatory views. In the figure, 1 is a base plate that is connected to one side of the seat cushion 9 of the vehicle seat, and 2 and 3 are first and second members that are pivotally connected to the base plate 1 so as to be rotatable about a rotation shaft 4. The second lower arm 5 has a rotation shaft 6 attached to the second lower arm 3.
It is connected to the seat back 10 by an upper arm rotatably pivoted at. The base plate 1 and the lower arm 2 each have a protruding pin 1a,
A coil spring 7 connecting between the lower arm 2a and the lower arm 2 is elastically loaded, and a rotational force is applied to the lower arm 2 in the counterclockwise direction in the drawing about the rotation shaft 4. This pin 2
a passes through a long hole 3g drilled in the lower arm 3, and also slides on a circular arc portion 1e formed on the base plate 1 around the rotation axis 4, and stops at a stopper 1d formed at the end thereof. However, the lower arm 2 can be tilted clockwise in the drawing by a predetermined angle.
Further, a stopper 2b is also formed on the lower arm 2, and a protrusion 1b that abuts against the stopper 2b is provided in a protruding manner on the base plate 1. On the other hand, a pin 2c is provided protruding from the upper end of the lower arm 2, and a roller 2d is rotatably pivoted to this pin 2c. Further, the lower arm 3 is provided with an elongated hole 3a having a predetermined length in an arc shape with the rotation shaft 4 as the center, into which the roller 2d is fitted. Furthermore, the lower arm 3 has an arc-shaped notch 3b centered on the rotation axis 4.
is formed, and stoppers 3c and 3d are formed at both ends thereof.
is formed. The stopper 3c collides with a protrusion 1e protruding from the base plate 1 and is stopped from rotating. The upper arm 5 is integrally formed with a substantially V-shaped long hole 5a centered on the rotation axis 6 and an arc-shaped long hole 5b centered on the rotation axis 4. is long hole 3a of lower arm 3
can match. Further, a stopper 5c is formed at the lower part of the upper arm 5, and a protrusion 3c that abuts against the stopper 5c is provided in a protruding manner on the lower arm 3. Further, the lower arm 3 is provided with a rising portion 3f below the rotation shaft 6, and a pin 5d that faces the rising portion 3f in a substantially horizontal position is provided protruding from the upper arm 5. A coil spring 8 is elastically loaded between the pins 5d.

Next, the operation of the above embodiment will be explained. First, when folding the seat bag 10 onto the seat cushion 9, the seat bag 10 is pushed down toward the seat cushion 9 in the state shown in FIG. Release the lock. Therefore, if the seat back 10 is pushed down toward the seat cushion 9, the upper arm 5 and lower arm 2,
3 integrally rotate in the counterclockwise direction in the figure around the rotation shaft 4, and the pin 2a of the lower arm 2 collides with the left end of the circular arc portion 1c of the base plate 1 and stops, and the rotation of the lower arm 2 stops. If the seat bag 10 stops and the seat bag 10 is still pushed down, the lower arm 3 rotates counterclockwise in the drawing within the range of the elongated hole 3a and stops. Therefore, the roller 2d of the lower arm 2 is connected to the upper arm 5 which overlaps with the elongated hole 3a of the lower arm 3.
Move to the right end of the elongated hole 5b in the figure. Then, when the seat back 9 is further pushed down, the upper arm 5 rotates in the counterclockwise direction in the figure around the rotation axis 4,
The roller 2d moves from the upper end where the long holes 5a and 5b are connected to the lower end, and the seat cushion 9 becomes approximately parallel to the seat back 10, as shown in FIG. Then, the center line of the coil spring 8 is located on the rotation axis 6 and reaches a dead point, so that no rotation torque is applied to the upper arm 5. Next, to return the state shown in FIG. 2 to the state shown in FIG. The hole 5a moves guided by the roller 2d, and the elongated hole 5b matches the elongated hole 3a of the lower arm 3, while the stopper 5c
collides with the protrusion 3e of the lower arm 3. and,
The upper arm 5 and the lower arm 3 integrally rotate in the clockwise direction in the figure around the rotation shaft 4, and the roller 2d moves to the left end of the elongated hole 3a in the figure. Therefore, the reclining angle may be set appropriately by operating the lock mechanism of the reclining device. Furthermore, the first
In the state shown in the figure, in order to bring the seat back 10 into a fully flat relationship with the seat cushion 9, the locking mechanism of the reclining device is released and the seat back 10 is pushed backward, and the upper arm 5 and lower arms 2 and 3 are integrally moved. The stopper 2b of the lower arm 2 collides with the protrusion 1b of the base plate 1, and the stopper 3c of the lower arm 3 collides with the protrusion 1e of the base plate 1. The pin 2a moves through the elongated hole 3g of the lower arm 3 from the left end in the figure to the right end in the figure, collides with the stopper 1d of the base plate 1 and is stopped from rotating, and the seat back 10 and the seat cushion 9 become fully flat as shown in FIG. It becomes a state. Furthermore, in order to change from the state shown in FIG. 3 to the state shown in FIG. 1, when the seat bag 10 is lifted, the upper arm 5, lower arm 2,
3 rotate in a counterclockwise direction around the rotation shaft 4 as one body, and are in the state shown in FIG. That is, since the upper arm 5 and the lower arm 3 are loaded with a spring 8, they rotate together, while the lower arm 2 rotates counterclockwise in the figure around the rotation axis 4 due to the force of the spring 7. Since rotational force is applied to the roller 2d, the long holes 3a and 5
This is because b is not moved.

[Effect of idea]

According to the present invention described above, when the upper arm is bent forward, the center line of the coil spring loaded between the upper arm and the lower arm is positioned on the axis of the upper arm and the lower arm. In that case, the coil spring does not reach a dead point and apply rotational torque to the upper arm, and therefore, the problem of the seat back lifting up does not occur. In addition, when the seat back is raised, the coil spring leaves the dead point and applies rotational torque to the upper arm as a restoring force, making it easier to raise the seat back.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure shows a state in which the seat bag is folded over the seat cushion, and FIG. 3 shows a state in which the seat bag and seat cushion are fully flat. 1... Base plate, 2, 3... Lower arm, 4, 6... Rotating shaft, 7, 8... Coil spring, 9... Seat cushion, 10... Seat back.

Claims (1)

[Scope of utility model registration request] a pair of lower arms that are rotatably connected to each other by sandwiching a base plate that is connected to the seat cushion; an upper arm that is rotatably connected to one of the lower arms and connected to the seat bag; A hinge device for a vehicle seat, which has a coil spring loaded between lower arms, and allows the seat bag to be folded over the seat cushion or to be fully flat.
A hinge for a vehicle seat, characterized in that the coil spring is elastically loaded so that when the seat bag is folded over the seat cushion, its center line is located on the pivot between the upper arm and the lower arm. Device.