JP2717280B2 - Seat back hinge lock mechanism - Google Patents

Description

The present invention relates to a seat back hinge lock mechanism for a rear seat.

b. Conventional technology For example, in a car such as a one-box car having a space for loading luggage behind the rear seat back, it is convenient to load large luggage (see FIG. 6). In addition to the regular seatback position (inclination angle), a mechanism is used to lock the seatback before that position, that is, at a position almost upright.

8 and 9 show this seat back hinge lock mechanism. That is, a is an upper arm provided on the lower side of the seat back, b is a lower base fixed to the side of the seat cushion, c is a lock plate, and the upper arm a is rotatably supported by the lower base b by a pin b. The lock plate c is rotatably supported on the lower base b by a pin e.

The lock plate c has a lock striker c1 at an end, and the striker c1 is configured to be able to engage and disengage with a plurality of lock grooves a1 formed at the edge of the upper arm a.
f is a tension spring, which is locked by a spring hook c2 provided at the end of the lock plate c and a spring hook b1 provided by the lower base b, and the lock striker c1 of the lock plate c is always held by the lock groove a1 of the upper arm a. You are urging you to. The seatback is tilted and locked by the engagement positions of the lock grooves a1 and the lock strikers c1.

c. Problems to be Solved by the Invention In the conventional hinge lock mechanism, the tilt angle θ is as small as about 20 ° due to space or the like. for that reason,
The pitch angle of each lock groove a1 is small, and the space a2 between the grooves a1
Is narrower. Therefore, if the turning radius R of the upper arm a is small, the space a2 becomes insufficient in strength. Therefore, it is necessary to increase the turning radius R of the upper arm in order to provide strength, and there is a disadvantage that the structure becomes large.

Further, in order to restrict the radius of gyration R to a small value, it is necessary to use sawtooth-shaped teeth instead of other structures, for example, the lock grooves.

d. Means for Solving the Problems The present invention has been made in view of the above circumstances, and has as its object to provide a seat back hinge lock mechanism for a rear seat that solves the above problems.

That is, the present invention provides a seat hinge lock mechanism in which an upper arm having a plurality of lock grooves at an end portion is rotatably supported on a lower base, and the lock base is rotatably supported on the lower base. And a lever that rotates integrally with the lock base on the same rotation axis as the lock base, and a pair of substantially U-shaped lock strikers to be engaged with the lock grooves of the upper arm on the lock base. A further plate is rotatably supported on the lower base so that one end of the plate is engaged with one striker of the lock base. A seat back hinge lock machine in which one end of a spring is locked at one end and the other end of the spring is locked to another striker of the lock base. It solved the above problems by the.

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

1 to 6, 1 is a rear seat back, 2
Numeral 3 denotes a rear cushion seat, and numeral 3 denotes a hinge lock mechanism in which the rear seat back 1 is attached to the cushion seat 2 so as to be tiltable forward and backward. La indicates the luggage loaded on the back of the rear seat back 1.

The hinge lock mechanism 3 is composed of the following main parts. That is, 4 is an upper arm, 5 is a lower base, 6 is a lock base, 7 is a plate, and 8 is a lever.

The upper arm 4 is rotatably engaged with the lower base 5 by a pin 11. At the lower end of the upper arm 4, a plurality of lock grooves 4a, 4b are provided at intervals. The upper arm 4 has a pin 12 projecting therefrom and a pair of mounting holes 4c for the seat back 1 formed therein.

The lower base 5 has an arc-shaped guide groove 5a. The guide groove 5a is guided by fitting a pin 12 protruding from the upper arm 4. A pin 14 is provided on the lower base 5 so as to be rotatable, and guide grooves 5b and 5C are formed around the pin 12 so as to face each other. The base 5 has a pair of mounting holes 5 d for the cushion sheet 2.

A pin 14 standing on the lower base 5 is inserted through the center of the lock base 6. Lock base 6 and pin 14
They are connected to each other so as to rotate integrally by a rotation preventing structure. A pair of lock strikers 16 and 17 each having a substantially U-shaped bar formed in a circular cross section and positioned on both sides of the pin 14 are opposed to the lock base 6 (see FIG. 5). ). These rock strikers 16,17
Are inserted through the guide grooves 5b and 5c of the lower base 5.

The plate 7 is rotatably supported by pins 18 implanted on the lower base 5. At one end of the plate 7, a long guide groove 7a is provided. One end of a lock striker 16 provided on the lock base 6 is provided in the guide groove 7a.
16a is inserted and engaged. At the other end of the plate 7, a hook pin 7b is provided upright. Between the pin 7b and the extension 17a of the lock striker 17 of the lock base 6,
The spring 20 is hooked.

A lever 8 is fitted to the end of the pin 14 implanted on the lower base 5. When the lever 8 is turned, the pin 14 is turned integrally, so that the lock base 6 can be turned accordingly.

e. Operation The hinge lock mechanism according to the present invention operates in the following manner.

FIG. 1 shows a state in which the rear seat back 1, that is, the upper arm 4, is upright. In this case, the lock striker 17 of the lock base 6 is fitted in the lock groove 4b of the upper arm 4, so that the upper arm 4 is in a locked state without rotating. The lock base 6 is urged counterclockwise by the spring 20, and presses the lock striker 17 against the lock groove 4b. The plate 7 is urged clockwise.

Now, when the lever 8 is slightly rotated clockwise against the pulling force of the spring 20, the lock striker is released from the lock groove 4b.
17 comes off. Therefore, the upper arm 4 is freely rotatable. When the upper arm 4 is tilted forward while the lock striker 17 is in contact with the edge of the upper arm 4, the lock striker 17 is fitted into the lock groove 4a,
As shown by the two-dot chain line, the locked state in the forwardly inclined state is obtained.

Next, when the lever 8 is largely turned clockwise, the lock base 6 rotates clockwise and the plate 7 rotates counterclockwise about the pin 18. As a result, when the line connecting the hook pin 7b that locks the spring 20 and the extension 17a of the lock striker 17 passes through a position that coincides with the center of the pin 18 (that is, the dead point), the lock base 6 rotates clockwise. , The plate 7 is biased in the counterclockwise direction, and the lock striker 16 abuts on the outer peripheral end of the upper arm 4. Accordingly, when the upper arm 4 is tilted rearward, the lock striker 16 is fitted into the lock groove 4a, and a locked state tilted rearward as shown in FIG. 3 is obtained.

By turning the lever 8 in the counterclockwise direction, it is possible to return to the state shown in FIG. 1 again. In this embodiment, the lock striker
Since the lock bases 16 and 17 are formed in a substantially U-shape, the rotation angle of the lock base 6 can be small, and
Since the present invention is used, it is possible to increase the number of types of inclination angles of the seat without increasing the number of notches of the four upper arms. Therefore, the size of the lock hinge mechanism can be reduced.

Although the above-described embodiment has been described based on a principle mechanism for easy understanding, in the case of actual application, since the shape and position of the lever 8 are not practically preferable, for example, as shown in FIG. A rod-shaped lever 38 is fitted to the pin 14 so as to extend to the upper arm side, and the lock striker 17a of the lock base 6 and the hook pin 7b of the plate 7
May be extended to the outside of the lever 38 and the spring 20 may be applied to both of them.

f. Effects of the Invention As described above, according to the seat back hinge lock mechanism of the present invention, a seat having an upper arm having a plurality of lock grooves at its ends rotatably supported on a lower base is provided. In the hinge lock mechanism, a lock base is rotatably supported on the lower base, and a lever that rotates integrally with the lock base on the same rotation axis as the lock base is provided. A pair of substantially U-shaped lock strikers to be engaged with the lock grooves are provided to face each other with the rotation axis of the lock base interposed therebetween, and another plate is pivotally supported on the lower base so as to be rotatable. Is engaged with one striker of the lock base, one end of a spring is locked to the other end of the plate, and the other end of the spring is Since the lock base is configured to be locked to another striker, the following effects can be obtained.

That is, in the present invention, the lock striker is formed in a substantially U-shape by the above configuration, so that the rotation angle of the lock base can be small, and the two lock strikers are used. In addition, a wide variety of seat inclination angles can be provided without increasing the number of notches in the upper arm. Therefore, the size of the lock hinge mechanism can be reduced.

Further, according to the present invention, the following effects can be obtained.

A locking mechanism having strength can be obtained without increasing the size of the upper arm.

Regarding the inclination of the seat back, the angle difference between the first stage and the second stage can be freely set.

It is also possible to increase the number of lock grooves, thereby enabling locking at a relatively small pitch angle of three or more steps.

Since the direction of the biasing force is changed by the displacement of the locking position of the link mechanism and the spring locked by the link mechanism, the operation of the hinge lock can be further ensured.

The structure is relatively simple, inexpensive and easy to implement.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a seat back hinge lock mechanism according to the present invention, FIG. 2 is an explanatory sectional view taken along line CC of FIG.
FIG. 4 is an operation explanatory view corresponding to FIG. 1, FIG. 4 is an exploded perspective view of a lower base, FIG. 5 is an exploded perspective view of a lock base, FIG. 6 is an explanatory view of an operation state of a rear seat and a seat back.
FIG. 7 is an explanatory view corresponding to FIG. 2 in another embodiment, FIG. 8 is a structural explanatory view of a conventional mechanism, and FIG. 9 is a partially enlarged view of FIG. 1 ... rear seat back, 2 ... rear cushion seat, 4 ... upper arm, 4a, 4b ... lock groove, 5 ... lower base, 6 ... lock base, 7 ... plate, 8 ... lever, 16, 17 ... rock striker, 20 ... spring.

Claims (1)

(57) [Claims] 1. A seat hinge lock mechanism in which an upper arm having a plurality of lock grooves at an end portion is rotatably supported on a lower base, wherein the lock base is rotatably supported on the lower base. A lever that rotates integrally with the lock base on the same rotation axis as the lock base is provided. A pair of substantially U-shaped lock strikers are provided on the lock base so as to face each other with the rotation axis of the lock base interposed therebetween. The pair of substantially U-shaped lock strikers are engaged with the lock grooves of the upper arm, and another plate is rotatably supported on the lower base, and one end of the plate is connected to one of the strikers of the lock base. And the other end of the plate is engaged with one end of a spring, and the other end of the spring is engaged with another striker of the lock base. Seat back hinge locking mechanism, characterized in that was.