JPH0217167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reclining device for an automobile seat, and more particularly, to a reclining device for an automobile seat, which is capable of obtaining small inclination angles and reliably stopping and holding at each inclination angle.

Generally, simple reclining devices have an engaging recess on one side and a pin on the other that is removably engaged with the engaging recess to adjust the inclination angle. Although it is necessary to reduce the pitch of the engaging recesses, there is a limit in this case due to strength issues. In view of this problem, Japanese Patent Publication No. 44-23071 and Japanese Patent Publication No. 44-27272 proposed a device for reducing the inclination angle in small increments without reducing the pitch of the engagement recess. There has been provided a device in which two engaging pins are alternately engaged with the troughs of the tooth pattern, and the inclination angle can be adjusted by 1/2 pitch of the tooth pattern.
However, in the above device, the pivot position of the lever with the protruding engagement pin that engages with the trough of the tooth pattern is not on the tangential line of the engagement pin that engages with the trough. In this case, there is a drawback that the engagement pin easily comes off from the trough. As described above, it is difficult to maintain the engaged state reliably and the strength is poor, so there is a problem that it is unsuitable for a reclining device for a car seat.

This invention aims to solve the above-mentioned conventional drawbacks, and includes protruding engagement pins that engage alternately in the troughs of the engagement recess so that they can be tilted in small increments at 1/2 pitch of the engagement recess. The pivot position of the lever is located on the tangent of the engagement pin that engages with the valley,
To provide a reclining device for a car seat that is securely held at a stop position by preventing disengagement even when a load is applied.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

The automobile seat 1 includes a seat back 4 rotatably attached to a seat bottom 2 attached to a vehicle body via a reclining device 3.

The reclining device 3 includes a seat bottom 2
A fixed bracket 5 fixed to the seat back 4, a tilting bracket 7 having a lower side rotatably attached to the fixed bracket 5 via a pivot 6 and an upper side fixed to the seat back 4, and a lower end of the tilting bracket 7 projecting. a pair of first engaging pieces 8 rotatably attached to the fixed bracket 5 via a support shaft 9;
The main components are the levers 10A, 10B and a pair of second levers 12A, 12B, which are also rotatably attached to the fixed bracket 5 via the support shaft 11.

The tilting bracket 7 has a stepped portion 7a recessed on the circumference centered on the pivot shaft 6 at its lower end overlapping the engaging piece 8 protruding from the side surface.
A raised portion 7b is provided near the. In addition, the hooking piece 13 is fixed near the pivot 6, and the pivot 6
A slotted groove 6a is provided in, one end of the spiral spring 14 is engaged with the above-mentioned hooking piece 13, and the other end is engaged with the pivot slotted groove 6a, and the tilting bracket 7 is rotated counterclockwise about the pivot shaft 6. It is energizing.
Therefore, the seat bag 4 to which the tilting bracket 7 is fixed is always biased forward.

At the lower end of the engaging piece 8 protruding from the lower end of the tilting bracket 7, as shown in FIG. 15a...15d) and convex portions 16, (16
a...16e) are formed alternately.

A first lever 10A rotatably supported via a pivot 6 on both left and right sides of the fixed bracket 5;
10B has a substantially doglegged shape, and its center portion is connected by the pivot 6 so that the first levers 10A and 10B are interlocked, and both levers 10A and 10B are connected to each other by the pivot 6.
A first engagement pin 17 is fitted between one end portion.
The first engagement pin 17 is located below the concave portion 15 and the convex portion 16 of the engagement piece 8 so as to face each other. Further, the first lever 10A on the outside side has a protrusion 18 that is bent and protrudes from the tip on the side where the engagement pin is attached.
Moreover, an operation knob 19 is attached to the other end.
Further, a tension spring 20 is stretched between the first lever 10A and the tilting bracket 7, and is biased in a direction in which the first engagement pin 17 engages with the engagement recess 15 of the engagement piece 8. In addition, the positional relationship is set such that the support shafts 9 of the first levers 10A, 10B are positioned tangentially to the arc of the toothed portion when engaged.

The second levers 12A and 12B are connected by a support shaft 11, and have one end rotatably supported on the lower rear side of the fixed bracket 5 at a position below the engagement piece 8. The other ends of the second levers 12A, 12B on the free side are positioned to face the first levers 10A, 10B, and the second engagement pin 21 is fitted between the other ends. There is. The second engagement pin 2
1 is located below the concave portion 15 and convex portion 16 of the engagement piece 8, facing each other. Also, one second lever 12
A protrusion 22 that protrudes upward is formed in B, and the protrusion 2
2 can be inserted into and removed from the stepped portion 7a of the tilting bracket 7. Furthermore, the second lever 12
The free ends of A and 12B are the protrusion 1 of the first lever 10A.
8, and when the protrusion 18 descends, the second
The second lever 12A, 1 abuts and engages with the engagement pin 21.
2B is pushed down, and the first levers 10A, 10B
I am trying to link it with. Also, the second lever 1
A tension spring 2 is placed between 2A and the tilting bracket 7.
3 is stretched, the second engagement pin 21 is biased in the direction of engagement with the engagement recess 15 of the engagement piece 8, and when engaged, the support shafts 11 of the second levers 12A, 12B are toothed. It is positioned tangentially to the arc of the section. Note that the second engagement pin 21 has a protrusion 22
When it is inserted into the stepped portion 7a of the tilting bracket 7, it can engage with the engagement recess 15, and when it is not inserted, it cannot engage with the engagement recess 15.

Next, the operation of the reclining device having the above configuration will be explained.

FIG. 2 shows the seat bag 4 in the most forward tilted position, with the first engagement pin 17 engaged with the engagement recess 15a at the frontmost portion of the engagement piece 8. At this time, the second
The protrusion 22 of the lever 12B is located away from the front end of the step 7a, and the second engagement pin 21 is located in the engagement recess 1.
Not engaged with 5. From the most forward tilted position, when the operating knob 19 is pulled in the direction P against the biasing force of the tension spring 20 as shown by the chain line in FIG. 2, the first levers 10A and 10B are moved clockwise. , and the first engagement pin 17 is removed from the engagement recess 15a. In this state, when the seat back 4 is pushed rearward, that is, the tilting bracket 7 is rotated clockwise about the pivot 6, the protrusion 22 of the second lever 12B is inserted into the stepped portion 7a, and the second engagement pin 21
is in a state where it can be engaged with the engagement recess 15. The second
When the pulling pressure of the operation knob 19 is released at the position where the engagement pin 21 corresponds to the engagement recess 15c, the second engagement pin 21 moves to the tension spring 2 as shown in FIG.
3 and engages with the engagement recess 15c,
The first engagement pin 17 is biased by the tension spring 20 and abuts and locks on the convex portion 16b at the rear of the 1/2 pitch. In this way, the tilting bracket 7 engages the engagement recess 1
It tilts at an angle of 5 1/2 pitches and stops.

Next, from this state, operate knob 1 in the same manner as above.
9 is pulled, the protrusion 18 of the first lever 10A descends and engages with the second engagement pin 21 to push down the second levers 12A, 12B, and the second engagement pin 2
1 is disengaged from the engagement recess 15c. In this state, when the tilting bracket 7 is moved rearward and the suction pressure is released at the position where the engagement recess 15 and the first engagement pin 17 correspond, the first engagement pin 17 is moved to the next engagement position at the frontmost part. While engaging with the mating recess 15b, the second engagement pin 21 abuts and locks on the protrusion 16d.

In this way, the first engagement pin 17 and the second engagement pin 21 alternately engage the engagement recesses 15, and the pitch (inclination angle A) between the engagement recesses 15 is changed as shown in FIG. It will be tilted at 1/2 pitch (tilt angle B).

Further, when the first engagement pin 17 and the second engagement pin 21 are engaged with the engagement recess 15, as shown in FIG.
Since the support shafts 9 and 11 of 2A and 12B are located in the tangential direction with respect to the arc of the toothed part, even when a load is applied to the tilting bracket 7, the engagement pins 17 and 21 move from the engagement recess 15 in the direction of the arrow. It does not move in the direction in which it leaves. Therefore, the engaged state is reliably maintained.

When the tilting bracket 7 reaches its final tilting position,
The protrusion 22 comes off from the rear side of the stepped portion 7a, the second engagement pin 21 does not engage with the engagement recess 15, and the first engagement pin 17 engages with the engagement recess 15c, and the tilting bracket 7
By abutting and locking on a restraining piece (not shown), further backward tilting is suppressed. In this way, the stepped portion 7
Outside the adjustment angle setting set by a, the second engagement pin 21 does not engage the engagement recess 15, and it is the first engagement pin 17 that finally engages the engagement recess 15 within the adjustment angle range. The adjustment pitch is constant at 1/2 pitch of the recess 15 within the adjustment angle setting range.

Further, when tilting the tilting bracket 7 forward, the first levers 10A and 10B are pulled from the most forward tilted position within the adjustment range shown in FIG.
Since the protrusions 22 of the levers 12A, 12B have already come off the stepped portion 7a and are engaged with the raised portion 7b, the pin 21 cannot engage with the engagement recess 15, and the first engagement pin 17 is at the forefront. Just by disengaging from the engagement recess 15a, the device will freely tilt forward.

As is clear from the above description, according to the reclining device according to the present invention, by adding the second lever provided with the second engagement pin, the first engagement pin of the first lever provided with the operation knob is By alternately engaging the engagement recesses of the tilting bracket, the inclination angle pitch can be reduced to half the conventional pitch (1/2 pitch).

In addition, since the pivot points of the first lever and the second lever are both located on the tangent line between the engagement pin and the recess, even if a load is applied to the tilting bracket from either the front or the rear, the lever will not engage from the recess. The dowel pin does not come off and has the advantage of improved holding strength.

[Brief explanation of drawings]

Fig. 1 is an external view of an automobile seat equipped with a reclining device according to the present invention, Fig. 2 is a front view of the reclining device, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a view of Fig. 2. FIG. 5 is a schematic diagram showing the positional relationship between the first lever, the second lever, and the recess;
FIG. 6 is an explanatory diagram of the pitch between the engaging recesses, and FIG. 7 is a front view of the engaging piece. 1... Seat, 2... Seat bottom, 3... Reclining device, 4... Seat back, 5...
Fixed bracket, 6... Pivot, 7... Tilting bracket, 7a... Step portion, 8... Engaging piece, 10A, 1
0B...First lever, 12A, 12B...Second lever, 15...Engagement recess, 16...Protrusion, 17...
...first engagement pin, 21...second engagement pin.

Claims (1)

[Claims] 1 Attach the fixing bracket to the seat bottom,
A tilting bracket is rotatably supported on the fixed bracket, a plurality of engagement recesses are arranged in an arc shape in the tilting bracket attached to the seat bag, and a first lever is pivotally supported on the fixed bracket. One end of the first lever is used as an operating part, and the other side is provided with a first engagement pin that can be freely engaged with and detached from the engagement recess, and the second lever is pivotably pivoted on the fixed bracket. the second lever is provided with a second engagement pin that can be freely engaged with and detached from the recess, and the first lever and the second lever are arranged substantially tangentially to the circular arc surface forming the engagement recess. An automobile seat characterized in that when the first lever is actuated, the second lever swings in conjunction with the first lever to alternately engage and disengage the first engagement pin and the second engagement pin in the engagement recess. Reclining device.