JPS5854810B2 - seat reclining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reclining device for tilting the backrest of a vehicle such as an automobile or other seat.

In conventional reclining devices, an arm attached to the back frame of the backrest is rotatably attached to a base plate attached to the cushion frame of the seat, and a gear fixed to the arm concentrically with the center of rotation is supported by the base plate. It is generally known that the inclination angle of the backrest can be adjusted by meshing and separating tooth profile pieces and gears, but this requires a large number of parts, increases the overall thickness and weight, and also Adjusting the inclination of the backrest is troublesome because it requires operations to engage and separate the toothed pieces and gears with the gears on the arm and to tilt the backrest, and the adjustment cannot be made steplessly.

Further, as another conventional example, the one described in Japanese Patent Application Laid-Open No. 54-24168 is known.

This is because the cylindrical pin around the oval plate engages with the inner engagement device provided on the arm and the base plate, and the basic idea is that the inner gear engages with the engagement teeth of the present invention from the operating plate. similar to the idea of

However, in this conventional example, in order to tilt the backrest back and forth as much as possible, the handle must be turned an extremely large number of times, and it is extremely troublesome to fully recline all at once or tilt it forward. Ta.

The present invention was invented in view of the above circumstances, and aims to provide a compact reclining device with excellent operability by reducing the number of parts, overall thickness and weight. .

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 is a cushion frame forming the frame of the seat. A base plate 3 is attached to one side of the rear end of the cushion frame 1, and a back frame 2 forming the frame of the seat backrest is attached to the back frame 2. The backrest is tilted by attaching the upper end of the arm 4 and rotatably attaching the arm 4 to the base plate 3.

The base plate 3 is provided with meshing teeth 5 whose tips point inward, and specifically, the meshing teeth 5 are formed at equal pitches on the inner peripheral surface of a circular hole 6 bored in the base plate 3. , or formed on the inner peripheral surface of a ring body (not shown) as the base plate 3.
It is designed to be installed on the

The illustrated circular hole 6 is surrounded by an annular protrusion 7 .

At the base of the arm 4, there is one large circular hole 8;
A plurality of stopper holes 9 are bored around the periphery, and the large circular hole 8 is fitted into the annular protrusion 7.

Further, the annular projection 11 of the attachment 10 is inserted into the large circular hole 8 of the arm 4, and the arm 4 is held between the attachment 10 and the base plate 3.

This attachment 10 also has a circular hole 12,
Engaging teeth 13 are formed on the inner peripheral surfaces of the circular hole 12 and the annular protrusion 11.

A stopper hole 14 is bored near this circular hole 12.

A circle formed by the two meshing teeth 5, 13 (circular holes 6, 1
2) to have the same diameter, and the attachment 10
The number of meshing teeth 13 on the side is larger than that on the base plate 3 side.

These meshing teeth 5, 13 are arranged side by side.
13, and has meshing teeth 1 on the outer periphery.
An inner gear 16 having a number 5 formed therein is inserted therein.

The inner gear 16 is formed into a ring shape from a stainless steel plate, a comb belt, a synthetic resin material, or the like, and has flexible properties.

Further, the number of meshing teeth 15 formed on the outer periphery is smaller than the number of meshing teeth 5 of the base plate 3.

An operation plate 17 is inserted into this flexible ring-shaped inner gear 16, and the operation plate 17 has a substantially rectangular shape with arcuate ends at both ends, and an insertion hole 18 is bored in the center. It rotates within the inner gear 16, and the tops at both ends push up the inner gear 16 to deform it into an elliptical shape.

At the top portions of both ends of the operating plate 17, three meshing teeth 5, 13, and 15 having different numbers of teeth mesh with each other.

The above three meshing teeth 5, 13, and 15 are A and B, respectively.

C, it is desirable that these be designed with dimensions as shown in the table below, for example.

When the members shown in FIG. 1 are assembled, the result is shown in FIG. 2. In FIG. 2, a cover 19 is attached to the back side of the base plate 3,
A shaft 20 is inserted into the insertion hole 18 of the operation plate 17, a knob 21 is fixed to one end of the shaft 20, and the housing 2 is inserted around the stopper hole 14 of the attachment 10.
2, and a stopper 23 whose tip is inserted into the stopper hole 9° 14 into the housing 22 is inserted into the housing 22.
4, the stopper is always urged toward the holes 9 and 14 and set.

When the knob 21 is rotated, the shaft 20 is rotated, and as the shaft 20 is rotated, the operation plate 17 is rotated,
As the operating plate 17 rotates, the elliptical shape of the inner gear 16 changes, and the meshing position of the three meshing teeth 5, 13, 15 changes.

When the stopper 23 is pulled, the tip of the stopper 23 comes out of the stopper hole 9 of the arm 3, allowing the arm 3 to rotate freely.

Next, the operation of the above-mentioned embodiment will be explained.
1 rotates the operating plate 17 within the inner gear 16, thereby changing the elliptical shape of the inner gear 16.

When the elliptical shape of the inner gear 16 changes, the meshing locations of the three meshing teeth 5, 13.degree. 15 change, and accordingly the arm 4 rotates and the backrest tilts.

In FIGS. 3 and 4, the operating plate 17 is located in a vertical position, and three meshing teeth 5, 13 are formed at locations X and X'.
゜15 is definitely engaged.

The meshing state of the teeth before and after the points X and X' gradually changes by the difference in the number of teeth (see FIG. 4).

In order to reliably engage the three meshing teeth 5° 13.15 at the point Y in Fig. 4 from this state, it is sufficient to rotate the operating plate 17 counterclockwise in Fig. 3; The arm 4 moves by the distance shown in FIG. 41.

The stopper 23 integrates the arm 4 and the attachment 10, and when the stopper 23 is pulled and its tip is removed from the stopper hole 9, the integration between the arm 4 and the attachment 10 is released, and the attachment 10 is removed from the arm. Leave from 4.

When the attachment 10 is detached from the arm 4, the arm 4 can freely rotate, and by tilting the backrest forward or backward in this state, the backrest can be quickly tilted at a large angle.

In the embodiment, each stopper hole 9 is drilled at four locations, so the pulled stopper 23 is drilled into the adjacent stopper hole 9.
When the arm 4 and the attachment 10 are inserted into the position by the force of the spring 24, the arm 4 and the attachment 10 are integrated again.

If a drive shaft of a motor (not shown) is connected to the shaft 20, a power seat can be easily realized by turning on/off the current to the motor.

In particular, in the present invention, a large reduction ratio can be obtained by setting the number of teeth of the three meshing teeth 5, 13, and 15, so when making a power seat, reclining is done by two-stage and three-stage reduction as in the conventional method. There is no such complexity.

As explained above, according to the present invention, one of the three meshing teeth is formed into a flexible inner gear, and the meshing tooth with the largest number of teeth can be integrated into the arm and detached. The second largest number of teeth is provided on the base plate, an inner gear is inserted into both meshing teeth, and an operating plate is inserted into the inner gear to transform it into an elliptical shape. The structure is simple, and the number of parts can be significantly reduced, resulting in cost reduction.

In particular, the thickness of the main parts needed to achieve the reclining function when assembled is equal to the sum of the widths of the meshing teeth of the base plate and the attachment, plus or minus, making it possible to provide a product that is thinner and lighter than ever before. can.

In addition, the number of teeth of the three meshing teeth is changed, and the three meshing teeth mesh only at two opposing locations, so the elliptical shape of the inner gear changes with the rotation of the operating plate, and this elliptical shape changes. By changing the meshing position of the three meshing teeth in accordance with this, the arm can be rotated almost steplessly.

Furthermore, by integrating the arm and attachment with a stopper, the two operations of unlocking and then tilting the backrest are no longer necessary, as in the past, and the backrest can be tilted to any position simply by rotating the operation plate. It has excellent operability.

Furthermore, when the backrest is to be tilted forward or backward (full reclining) all at once, it is convenient to release the integration between the arm and the attachment using the stopper, since the arm can freely rotate independently.

In addition, the means for achieving forward or backward tilting all at once is as simple as pulling out the stopper inserted into the plurality of stopper holes drilled in the arm and the stopper drilled in the attachment, from the stopper hole in the arm. Moreover, since this stopper is biased in the direction of insertion into the hole, the tip of the stopper pulled out of the stopper hole of one arm will slide on the surface of the arm as the arm rotates, and the tip of the stopper will slide on the surface of the arm as the arm rotates. It is automatically inserted when it is above the stopper hole in the arm, making it extremely easy to operate.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts, FIG. 2 is a vertical sectional side view when assembled, FIG. 3 is a simplified front view, and FIG. 4 is an enlarged view of the part indicated by arrow 3 in FIG.

Claims (1)

[Scope of Claims] 1. A reclining device in which an arm attached to a back frame of a seat backrest is rotatably attached to a base plate attached to a cushion frame of a seat so that the backrest can be tilted. Drill a hole,
A meshing tooth with an inner hole at the tip of the tooth is provided in this circular hole, and an annular projecting edge is formed around the circular hole, and a large circular hole drilled in the arm is fitted into this annular projecting edge. A plurality of stopper holes are drilled around the large circular hole of the attachment, and the large circular hole of the arm is fitted into the annular protrusion formed around the circular hole drilled in the attachment. The arm is rotatably held between the arms, and the circular hole of this attachment is provided with meshing teeth with the tips of the teeth inserted into the inner holes, and the circles formed by the meshing teeth and the meshing teeth of the base plate are formed to have the same diameter. At the same time, a large number of teeth are formed on the attachment side, and these meshing teeth are placed adjacent to each other in the large circular hole formed at the base end of the arm, and a width of the husband and wife of these meshing teeth is placed in both of the juxtaposed meshing teeth. A flexible ring-shaped inner gear with a width approximately equal to the width of the ring and meshing teeth formed on the outer periphery is connected to the other two.
The inner gear is inserted so as to face the two juxtaposed meshing teeth, and the number of meshing teeth of the inner gear is formed to be smaller than that of the base plate side, and the inner gear is deformed into an elliptical shape to form the meshing teeth of the three meshing teeth. An operating plate that engages at two opposing points is rotatably inserted into the inner gear, a stopper hole is drilled in the attachment, the stopper is attached to the stopper hole while being biased in the insertion direction, and the stopper A reclining device for a seat, characterized in that a tip of the arm can be selectively inserted into and extracted from a hole in a stopper of the arm.