JPS6010432Y2 - Seat reclining device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a seat reclining device that tilts the backrest of a seat.

In conventional seat reclining devices, an arm fixed to the frame of the backrest is rotatably attached to a base fixed to the frame of the seat, the arm is locked to fix the backrest, and when the lock is released, the backrest is moved backwards. Devices that allowed the user to tilt and tilt forward were common.

In such a conventional device, a spring force is always applied to the backrest in the direction of forward tilting so that the backrest automatically tilts forward when the arm is unlocked.

Therefore, when the arm is unlocked, the backrest falls forward with force, and the operator may be hit in the face or head by the backrest.

Particularly, if you are a passenger car owner, you have probably experienced something like this at least once when you unlocked the arm while not seated in the vehicle.

The present invention was developed to eliminate such drawbacks, and alleviates the sudden forward tilting action caused by the spring force of the backrest after the seat reclining device is unlocked, thereby eliminating the operator's discomfort. It is an object of the present invention to provide a seat reclining device with good operability.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In the first embodiment shown in FIGS. 1 and 2, the arm 1 has upper portions fixed to the backrest frame 100.
b, and is rotatably attached via a rotation shaft 3 to a base 2 whose lower part is fixed to a seat frame 200.

Reference numeral 1c is a hole into which the rotating shaft 3 is inserted and fixed.

Further, upper teeth 4 are formed at the lower end of the arm 1.

A rotary shaft 3, which has been inserted through the hole 1c, is rotatably inserted into the hole 2a bored in the base 2, and a return spring 5 is attached to the tip of the rotary shaft 3. Case 6 attached to the back side of base 2
is housed in.

Therefore, the force of the return spring 5 to unwind always acts on the rotating shaft 3, and also acts on the arm 1 fixed to the rotating shaft 3 of the bracket.

The spring force of this return spring 5 causes the arm 1 to
In the figures and FIG. 2, it always rotates counterclockwise.

The upper teeth 4 of the arm 1 are adapted to engage with the lower teeth 9 of a locking member 8 whose one end is rotatably attached to the base 2 with a pin 7.

Further, an operating lever 10 is rotatably attached to the base 2 with a pin 11.

A pin 12 is fixed near the lower end of this operating lever 10,
A pin 13 is provided in a protruding manner above it.

A roller 14 is loosely fitted onto the pin 12, and the tip 8a of the locking member 8 is placed on the roller 14.

When this operating lever 10 is pulled up in the direction of arrow A in FIG.
pushes up the tip 8a.

As a result, the engagement between the upper teeth 4 and the lower teeth 9 is released, and the arm 1 becomes free.

At this time, the arm 1 falls forward due to the spring force of the return spring 5.

A reclining device configured as described above is well known.

In the embodiment of the present invention, a stopper 15 is further formed on the arm 1, a spring member 16 made of a coil spring is loosely fitted on the rotation shaft 3, and one end 16a of this spring member 16 is attached to the holder 17. Adopts mounted configuration.

This holder 17 is in a fixed state, and the other end 16b of the spring member 16 whose one end 16a is attached to this holder 17 hits the stopper 15 at a predetermined rotational position of the arm 1.

When the stopper 15 and the other end 16b collide and the arm 1 further rotates due to the spring force of the return spring 5, it means that the spring force of the return spring 5 overcomes the spring force of the spring member 16.

In this way, even if the spring force of the return spring 5 overcomes the spring force of the spring member 16 and causes the arm 1 to rotate (counterclockwise rotation in FIG. 1), the momentum of the rotation of the arm 1 is It will be damped and rotate slowly.

The action of the spring member 16 will be explained in more detail with reference to FIGS. Since it moves away from the other end 16b, the spring force of the spring member 16 does not act on the arm 1 at all.

Next, when the lock is released from the reclining or normal state, that is, when the engagement between the upper teeth 4 and the lower teeth 9 is released, the spring force of the return spring 5 begins to tilt the arm 1 forward, and the arm 1 becomes approximately vertical. When the other end 16b of the spring member 16 collides with the stopper 15 of the arm 1 (the state shown in Figure 3), the spring force of the return spring 5 is greater than the spring force of the spring member 16. Since it is set strongly, arm 1 rotates while slowing down the momentum of forward rotation, as shown in Figure 3C.
This results in a state of falling forward.

The spring force of the spring member 16 begins to act on the arm 1 from the state shown in FIG. 3, and continues to act on the arm 1 until it reaches the state shown in FIG.

Note that the spring force of the return spring 5 and the spring force of the spring member 16 may be equal to each other, or the spring force of the spring member 16 may be made stronger.

In this way, when the lock is released, the arm 1 will stand still in the state shown in Figure 3.

If you want to tilt the arm 1 further forward, use the spring member 16
What is necessary is for the operator to forcibly tilt the backrest forward against the bouncing force and lock the reclining device again in the forward tilted state.

Next, a second embodiment of the present invention will be described with reference to FIG. 4 and the following drawings.

In this embodiment, a spring member 1 made of a plate spring is attached to a base 2.
6 is attached to the arm 1, and a stopper 15 is attached to the arm 1, which hits the spring member 16 at a predetermined rotational position of the arm 1.

The action of the spring member 16 and the stopper 15 is shown in Fig. 5a.
As shown in ``-''c, when the arm 1 is tilted backwards, the stopper 15 does not touch the spring member 16, but when the arm 1 is tilted forward, the tip of the stopper 15 touches the spring member (plate) at a predetermined position. When the arm 1 collides with the belly of the spring 16 and further falls forward, the stopper 15 bends the spring member (plate spring) 16 (the spring force of the spring member 16 is acting on the arm 1), and the arm 1 Stopper 1 at maximum tilt
The tip of 5 comes off the belly of the spring member (plate spring) 16.

In this second embodiment as well, the spring force of the return spring 5 and the spring member (plate spring) 16 may be equal or one of them may be stronger.

In each of the above-mentioned embodiments, the seat and backrest that make up the seat are not shown, but the rotation of the arm 1 is synonymous with the rotation of the backrest, and each member attached to the base 2 is moved toward the seat side. In other words, it can be said to be attached to.

Further, the means for rotatably attaching the lower end of the backrest to the seat portion is not limited to the illustrated example, and the mechanism for locking the rotation of the backrest is also not limited to the illustrated example.

Furthermore, as the spring member 16, various known springs other than a coil spring or a plate spring can be used.

As explained above, in the present invention, the lower end of the backrest (the lower end of the arm 1 in the embodiment) is rotatably attached to the seat (base 2 fixed to the seat frame 200 in the embodiment), and , is a seat reclining device equipped with a mechanism (mainly upper teeth 4 and lower teeth 8 in the embodiment) that locks the rotation of the backrest, and includes a return spring whose spring force acts to always tilt the backrest forward, and a backrest. The backrest has a spring member that applies a spring force in the opposite direction to the return spring when the backrest is tilted forward from a predetermined rotational position.

Therefore, the sudden forward tilt of the backrest caused by the return spring when the lock is released is alleviated by the spring member.
This prevents the operator from feeling uncomfortable.

Moreover, in order to raise the backrest from a forward-leaning state, the backrest can be raised easily and easily by the action of the spring force of this spring member, and operability is improved.

In addition, by making the spring force of the spring member weaker than the spring force of the return spring, the backrest tilts forward from a predetermined position while slowing down its rotation speed, so that the spring force of the spring member is applied to the backrest. This is more convenient than when the backrest stops tilting forward at the point where it starts to work.

Particularly in the front seat of a two-door type passenger car, it is easier to get in and out of the rear seat if the backrest is tilted forward.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention, Fig. 2 is a front view when assembled as seen from the line ■-■ in Fig. 1, and Figs. 3 a to C are the exploded perspective view of the first embodiment. Simplified front view explaining the operation, No. 4
The figure is a front view showing the second embodiment of the present invention.
c is a simplified front view illustrating the operation of the second embodiment. 5...Return spring, 16...
Spring member.

Claims (1)

[Claims for Utility Model Registration] 1. A seat reclining device in which the lower end of the backrest is rotatably attached to the seat and a mechanism for locking the rotation of the backrest, which always tilts the backrest forward. A seat reclining device characterized by having a return spring that applies a spring force as shown in FIG. 2. The seat reclining device according to claim 1, wherein the spring force of the return spring is stronger than the spring force of the spring member.