JPH02102838A - Two stage hinge for seat - Google Patents

Abstract

PURPOSE:To make it possible to satisfactorily and manually operate the change- over of lock in a two stage hinge for a seat by disposing a center arm between a lock arm and an upper arm, and by incorporating a lock mechanism, a stopper means and the like to these arms. CONSTITUTION:When a lever 8 is rotated counterclockwise, a striker 7a secured to a lock plate 7 is moved being guided by a guide groove 6a in an center arm 6, and then is fitted in a lock groove 4a in an upper arm 4. Then, the upper arm 4 cannot be rotated about a pin 11, and is operated integrally with the center arm 6. Since these are not restrained with respect to a lower arm 5, and accordingly can be moved freely within a range between stoppers 5c, 5d. A seat back 1 falls in a reclining condition at a position where the side end of the center arm 6 abuts against the stopper 5d. Meanwhile, when the lever 8 is turned clockwise, another striker 7b is fitted in a lock groove 5a in the lower arm 5.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a two-stage hinge for a seat equipped with a locking mechanism used in a vehicle or the like.

b. Prior Art Figures 6 to 9 are examples of conventional two-stage hinges for seats. In Figure 6, which shows the operating state, a is the upper arm attached to the seat back side, and d is the upper arm attached to the Tafsilane seat side. The lower arms b and c attached to the upper arm are engaged with each other and are provided between the upper arm a and the lower arm d.

The upper arm a is provided with a mounting hole a1 for attaching to the seat back, a guide groove a2 shaped like a letter 0 formed with an arcuate outline, and a protrusion a3.

The lower arm d is provided with a mounting hole d1 for attaching to the KUSHIRAN sheet, and the arms b and c are rotatably held by a pin e.

The arm b is provided with an arcuate guide groove b1 and a stopper b2, and is rotatably engaged with the upper arm a by a pin f.

The arm C holds at its tip a pin g which is fitted into the guide groove a2 of the upper arm a and the guide groove bl of the arm b.

FIG. 6 shows a state in which the seat back is tilted forward, and the upper arm a is tilted forward about the bin f. The end of the guide groove a2 hits the pin g of the arm C, and the upper arm a cannot tilt forward any further.

FIG. 9 shows a reclining state in which upper arms a, arms b, and c are tilted rearward with bin e as the center of rotation.

FIG. 8 shows the standard operating condition in which the seven-piece arm a, arm b, and arm C are fixed by the bin g. The upper arm a has its protrusion a3 hitting the stopper b2, and cannot tilt any further backward.

FIG. 7 shows the preliminary stage of tilting the seat back forward in order to transition from the state shown in FIG. 8 to the state shown in FIG. And,
It is located at the right end of the guide groove bl of arm b, and arm b does not tilt forward to the left beyond this point.

C1 Problem to be Solved by the Invention In the state shown in FIG. 7, if the seat back is now tilted forward, only the upper arm a will tilt forward. Further, when arm b is tilted backward, upper arm a and arm b are integrally tilted backward. Furthermore, when arm C is tilted backward, upper arm a, arm b, and arm C tilt backward while remaining in the state shown in FIG.

In order to achieve the state shown in FIG. 9, it is desirable to tilt the switch backward from the state shown in FIG. 8. In this way, there is a problem that there is too much freedom in the operation at the switching point, and there is a lack of sense of moderation. Therefore, the hinge lock mechanisms provided on both the left and right sides of the seat are not synchronized and move independently, which sometimes results in a lack of smooth operation. Another disadvantage is that the switching mechanism is relatively complex.

d. Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a two-stage hinge for a seat that solves the above-mentioned problems.

That is, in the present invention, a center arm is provided between a lower arm and an upper arm, and when the center arm is rotatably engaged with a lock plate provided with a striker approximately in the center, both ends of the center arm are connected to the lower arm. and an upper arm, respectively, lock grooves for engaging and disengaging the striker of the lock plate are provided on the edges of the lower arm and the upper arm, respectively, and a stopper for roughly regulating the tilted position of the hinge is provided on the lower arm. The above-mentioned problem has been solved by providing a bifurcated hinge for a seat, which is characterized in that it is provided on the upper arm and the upper arm.

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

In Figures 1 to 5, 1 is the seat back, 2 is the seat back, and 3 is the seat back 1 and the seat back 2.
In contrast, this is a two-stage seat hinge that can be installed so that it can be tilted forward and backward.

The two-stage seat holder 3 is composed of the following main parts. That is, 4 is the upper arm, 5 is the lower arm,
6 is a center arm, 7 is a lock plate, and 8 is a lever.

The upper arm 4 has a bin 11 with respect to the center arm 6.
and a lock groove 4a at the lower end, a pair of mounting holes 4b for the seat back 1,
A stopper 4c (manufactured by embossing or the like) is provided at the side end of the bottle 11.

The lower arm 5 rotatably holds and supports the center arm 6 with a bin 12, and has a lock groove 5a at the upper right end of the bin 12, a pair of mounting holes 5b for the cutter seat 2 at the lower part, and a bin 12. A stopper 50 and a stopper 5d are provided at the diagonally upper left and lower right ends of 12.

The center arm 6 is rotatably engaged with the lock plate 7 by a shaft 13 passing through the center of the center arm 6, and is provided with an arcuate guide groove 6a on the outer periphery of the shaft 13. Both ends of 6a are formed into a circular arc shape.

The center arm 6 has a projection 6b at its end above the bin 11 which is rotatably engaged with the upper arm 4.
This is provided.

The lock plate 7 has a pair of strikers 7a with a circular cross section.
, 7b are provided at intervals, and the striker 7a.

7b passes through the guide groove 6a of the center arm 6,
The penetrating ends are connected to each other to form a U-shape. Further, the lock plate 7 is fitted onto the shaft 13 so as not to rotate. For example, the shaft 13 is provided with an angular section, and this section is fitted into the angular section hole of the lock plate 7, so that the shafts 13 do not rotate relative to each other.

The lever 8 is fitted onto the end of the shaft 13 so as not to rotate, and when the lever 8 is rotated, the lock plate 7 is also rotated together.

e. Operation The two-stage seat hinge according to the present invention is operated in the following manner.

First, when the lever 8 is rotated counterclockwise from the state shown in FIG. 1, the striker 7a fixed to the lock plate 7 is guided by the guide groove 6a of the center arm 6 and moves in the direction of the arrow. Lock groove 4 of upper arm 4
a (see Figure 3).

Therefore, the upper arm 4 cannot rotate around the pin 11 (and thus operates in unison with the center arm 6).Since these are not restrained with respect to the lower arm 5, the stopper 5
c and the stopper 56. Then, as shown by the chain line in FIG. 3, the seat back 1 is in a reclined state at a position where the side end of the center arm 6 comes into contact with the stopper 5d. That is, when the lever 8 is operated counterclockwise in the state shown in FIG. 1, the seat back 1 can be tilted to a reclined state. Furthermore, the stopper 5c prevents the seatback l from being tilted forward beyond the illustrated state.

When the lever 8 is rotated clockwise after returning from the reclining state to the state shown by the solid line in FIG. The other striker 7b is removed from the lock groove 4a of the lower arm 5.
a and returns to the state shown by the solid line in FIG. As a result, the center arm 6 is restrained by the lower arm 5 and cannot rotate.

On the other hand, since the upper arm 4 is no longer restrained by the center arm 6, it can freely rotate forward around the bin 11.
The stopper 40 can be tilted forward until it comes into contact with the projection 6b of the center arm 6 (see the state indicated by the chain line in FIG. 1).

Specifically, in the state shown in FIG. 1, the center arm 6 is restrained by the stopper 50 of the lower arm 5 and the striker 7b fitted into the lock groove 58 of the lower arm 5, and cannot rotate. The stopper 4c comes into contact with the side end of the center arm 6, thereby preventing it from rotating rearward.

f. Effects of the Invention As described above, the two-stage hinge for seats according to the present invention provides the following effects.

■ The two-stage hinge lock can be switched manually using a lever.

■ There is no excessive degree of freedom in switching the lock of the two-stage hinge as in the conventional example (there is a clear sense of moderation).

■ The rotation restriction position for forward and backward tilting can be freely selected depending on the presence or absence and position of each stopper protruding from each arm.

■ The hinge position can be changed using a small lock plate, and the structure is simple and cost-effective.

■ Not only front and rear seats of vehicles, but also various equipment that requires a two-stage hinge structure.

Applicable to the device.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of a two-stage hinge for a seat according to the present invention, FIG. 2 is an explanatory side cross-sectional diagram of FIG. 1, FIG. 3 is an operational explanatory diagram corresponding to FIG. 1, and FIG. FIG. 5 is a perspective view of the lock plate, FIG. 5 is an explanatory diagram of the operation of the seat, and FIGS. 6 to 9 are explanatory diagrams of the operation of a conventional two-stage hinge. 4...Upper arm, 4c...Stopper 5m...Lock groove, 6...Center arm, 7...Lock plate, 4a...Lock groove, 5...Lower arm, 5c/5d... Stopper 6a...Guide groove, 7a/7b...Striker. 5b Diagram

Claims (1)

[Claims] A center arm is provided between the lower arm and the upper arm, and the center arm is rotatably engaged with a lock plate equipped with a striker at approximately the center thereof, and both ends of the center arm are rotatable to the lower arm and the upper arm, respectively. A locking groove for engaging and disengaging from the striker of the locking plate is provided on the end edge of the lower arm and the upper arm, respectively, and a stopper for regulating the tilted position of the hinge is provided on the lower arm and the upper arm. Two-stage hinge for seats.