JPS6041154Y2 - Angle adjustment and fixing device for joint members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting and fixing the angle of a joint member for adjusting the tilting angle of a seat back, headrest, etc. in a seat, such as a vehicle seat.

Conventionally, this type of angle adjustment and fixing device consists of a spur gear that is fixed to the rotation center shaft on the fixed member side, and a spur gear that has a root circle diameter larger than the tooth tip circle diameter and is fixed on the movable member side. The movable member is rotated eccentrically with respect to the fixed member, that is, around the rotation center axis, by engaging the internal tooth ring at a part thereof and eccentrically rotating the internal tooth ring with respect to the spur gear using an operation knob. The rotation angle is adjusted and fixed.

However, with the device for adjusting and fixing the angle of the movable member configured in this way, the internal tooth ring must be rotated both in the front and rear directions in order to adjust the rotation angle of the movable member with respect to the fixed member. When used as a device for adjusting the tilt angle of the back seat in a vehicle seat, that is, as a reclining device, the operation knob that rotates the internal tooth ring must be continuously rotated for both forward and backward tilting of the back seat. Therefore, the tilt adjustment operation of the back seat requires time and effort, and there is a drawback that the back seat cannot be quickly set at a desired angle.

Therefore, the present invention makes it possible to finely adjust the rotational angle position between the fixed member and the movable member that constitute the joint member of the seat, and also allows the movable member to be freely movable with respect to the fixed member. An object of the present invention is to provide a device for adjusting and fixing the angle of a joint member, which allows the angle of the joint member to be largely varied in one operation up to a desired rotational position.

An embodiment of the device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a vehicle seat. The seat S is composed of a cushion seat Sc and a pack seat sb. The pack seat sb is arranged so as to be tiltable with respect to the cushion seat Sc. The angle adjusting and fixing device 1 of the present invention is applied as a joint member, that is, a reclining device that connects the two.

The device 1 of the present invention will be explained in detail with reference to FIGS. 2 to 5.

The device 1 of the present invention is a fixed arm 1 as a first toothed arm.
1. The fixed arm 11 is supported on an eccentric shaft 14 so that the relative positions of the intermediate toothed plate 12 and the movable arm 13 as the second toothed arm can be changed, and are controlled by an operating lever 15 as an operating means. It is configured to engage and release the intermediate toothed plate 12 and the movable arm 13, and the fixed arm 11 is attached to the cushion seat Sc and the movable arm 13 is attached to the pack seat sb.

The fixed arm 11 and the movable arm 13 are provided with necessary through holes 11a and 13a for fixing with screws or the like, and the knob 2 is fixed to the eccentric shaft 14.

A circular recess 16 is formed in the fixed arm 11, an internal gear part 17 is formed on the inner peripheral surface thereof, and a shaft hole 18 is provided in the center so that the first shaft part 14a of the eccentric shaft 14 can rotate. The holding frame 20 of the return spring 19 is fixed to the outer surface of the circular recess 16.

The intermediate toothed plate 12 that engages the movable arm 13 in relation to the fixed arm 11 has an outer end tip circle whose diameter is at least as high as the tooth height than the diameter of the root circle of the internal gear portion 17 of the fixed arm 11. Also, the tooth width is approximately 2 of the tooth width of the internal gear 17.
A double external gear part 21 is formed, and a shaft hole 22 is provided in the center thereof, and the first shaft is located on an axis spaced apart from the axis a of the first shaft part 14a of the eccentric shaft 14 by a predetermined distance. Part 1
A second shaft portion 14b integrally connected to 4a is rotatably fitted.

Here, the distance between the axes a and b, that is, the first and second
The amount of eccentricity between the shaft portions 14a and 14b of the fixed arm 11 is
The radius of the root circle of the internal gear portion 17 and the radius of the tip circle of the external gear portion 21 of the intermediate toothed plate 12 almost match the difference between the radius of the root circle of the internal gear portion 17 and the radius of the tip circle of the external gear portion 21 of the intermediate toothed plate 12, and this difference is 21 to ensure automatic engagement in some areas.

The movable arm 13 also has an external gear portion 2 of the intermediate toothed plate 12.
1 is formed with an internal toothed ring part 23 that meshes with the intermediate toothed plate 1 at a ratio of 1:l, and this movable arm 13 connects the internal toothed ring part 23 with the intermediate toothed plate 1.
It meshes with the external gear part 21 of No. 2, overlaps and contacts the fixed arm 11, and is held by a presser plate 24 in which a recess 24a covering the intermediate toothed plate 12 is formed.

A shaft hole 25 is provided in the holding plate 24 so that the first shaft hole 25 of the eccentric shaft 14 can be
A third shaft portion 14c, which is integrally connected to the second shaft 14b on the same axis a as the shaft portion 14a of A coil spring 26 is interposed therebetween to constantly press and bias the intermediate toothed plate 12 toward the fixed arm 11, causing the external gear portion 21 to mesh with the internal gear portion 17 of the fixed arm 11. Approximately half of the tooth width of the external gear portion 21 is meshed with the internal tooth ring portion 22 of the movable arm 13.

The operating lever 15 also has a third shaft portion 14c of the eccentric shaft 14.
A cam surface 28 is formed integrally with the circumferential surface of the elongated hole 27, and the cam surface 28 is slanted upward in one direction. The third shaft portion 14c of the eccentric shaft 14 is inserted into the hole 27, and a projecting edge 2 is provided on the outer periphery of the shaft hole 25 of the holding plate 24.
5a and a retaining piece 29 fitted to the third shaft portion 14c, and is rotatable in the vertical direction relative to the fixed arm 11 so that the cam surface 28 slides on the engaging piece 29. axis pin 3
It is pivoted by 0.

Further, the movable arm 13 has a pin 31 protruding from it, which engages the free end 19a of the return spring 19 and is always biased forward. A coil spring 33 is stretched between the cam surface 32 and biased so as to rotate downward at all times, so that the lower surface of the cam surface 28 faces the engagement piece 29 at a distance.

Next, the operation mode of the angle adjusting and fixing device 1 of this example configured as described above will be explained.

First, in the normal state, the operating lever 15 is rotated downward so that the lower surface of the cam surface 28 faces the engagement piece 29 in a spaced state, and the intermediate toothed plate 12 is pressed by the coil spring 26. One half of the ridge portion of the external gear portion 21 is engaged with the internal gear portion 17 of the fixed arm 11 within a portion thereof, and the other half width portion of the external gear portion 21 is engaged with the inner gear portion of the movable arm 13 over the entire circumference. The movable arm 13 is engaged with the toothed ring portion 23, so that the movable arm 13 is in a locked state with respect to the fixed arm 11 (FIG. 3).

Then, when the knob 2 is rotated, the second shaft portion 14 of the eccentric shaft 14
b is rotated around the central axis a of the first shaft portion 14a, thereby causing the second shaft portion 14b to perform a rolling motion, and this rolling motion is transmitted to the movable arm 13.

That is, by rotating the knob 2, the movable arm 13 moves to the intermediate toothed plate 1.
Since the external gear part 21 of the intermediate toothed plate 12 has fewer teeth than the internal gear part 17 of the fixed arm 11, this difference in the number of teeth causes the external gear part 21 to rotate integrally with the intermediate toothed plate 12. is meshed with the internal gear part 17 in a part of the range, and the range of this meshing is moved by the rotation of the eccentric shaft 14, and when the knob 2 is rotated once, the meshing part is on the inner periphery of the internal gear part 17. It will go around once.

With one rotation of the knob 2, the movable arm 13, which is integrally engaged with the intermediate toothed plate 12, is rotated by the ratio of the number of teeth described above.

By rotating the movable arm 13, the tilting position of the back seat Sb can be changed in a fine adjustment manner as in the conventional device.

Further, when the back seat sb is to be tilted forward or backward greatly, when the operating lever 15 is pulled up against the biasing force of the coil spring 33, the locking position of the elongated hole 27 with respect to the eccentric shaft 14 is shifted, that is, the cam surface 28 The high part of the cam surface 28 is brought into contact with the engagement piece 29, and by further pulling it up, the cam surface 28
The retaining piece 29 is pressed by the high portion of the retaining piece 29, and the eccentric shaft 14 is therefore slid outward.

As the eccentric shaft 14 slides, the intermediate toothed plate 12 is separated from the fixed arm 11 against the biasing force of the coil spring 26, and the external gear part 21 is disengaged from the internal gear part 17, and the intermediate toothed plate 12 is separated from the fixed arm 11 against the biasing force of the coil spring 26. The toothed plate 12 is free to rotate.

At this time, the intermediate toothed plate 12 and the movable arm 13 are connected to the external gear part 2.
1 and the internal tooth ring portion 23 are maintained, so that they maintain an integrally engaged state (FIG. 4).

Therefore, by pressing the back seat sb forward or backward in this state, the bank seat sb is tilted forward or backward, but in this example, the movable arm 13 is biased forward by the return spring 19. Therefore, the back seat Sb is automatically tilted forward.

On the other hand, in order to raise the back seat Sb from the forward tilted state or to tilt it significantly backward, it must be pulled up against the biasing force of the return spring 19, pressed, and rotated to a position close to the desired angle. The operating lever 15 is operated to lock the movable arm 13 to the fixed arm 11 to hold the back seat sb at a desired angle.

The movable arm 13 is locked to the fixed arm 11 by rotating the operating lever 15 downward, which releases the pressing of the engagement piece 29 by the cam surface 28, so that the intermediate toothed plate 12 and the eccentric shaft 14 are held together by the coil spring. 26 is moved inward and joined to the fixed arm 11, and the external gear part 21 is meshed with the internal gear part 17, so that the movable arm 13 that is in mesh with the intermediate toothed plate 12 is fixed. It will be engaged with the arm 11.

In order to further adjust the angle of the back sheet sb held at an inclination in this way to a desired angle, from this state, the above-mentioned knob 2
A fine adjustment operation is performed by rotating the eccentric shaft 14.

The angle adjusting/fixing device 1 of this example can be installed on both sides of the seat, that is, on both sides between the cushion seat Sc and the back seat sb. In the case where the devices are arranged symmetrically and are operated in conjunction with each other, both devices are arranged in the same direction, and the eccentric shafts are connected by the interlocking shaft.

In this case, the knob and operating lever need only be attached to one device, that is, the device on the sliding protruding side of the eccentric shaft.

The embodiment configured as described above is merely an example of the present invention, and the present invention is not limited thereto. The external teeth or the cam surface of the operating lever can be modified in various ways as long as they perform the above-mentioned operations, and the device of the present invention may be driven and operated using an electric drive device.

As described above, the device for adjusting and fixing the angle of a joint member according to the present invention can rotate the movable arm by a large amount in one operation when adjusting the rotation angle of the movable arm, and the rotation angle can be adjusted to the same angle as the conventional device of this type. This switching operation is performed by moving the intermediate toothed plate on one axis, so it can be done smoothly and reliably.If the device of the present invention is applied to a seat reclining device for a vehicle, In the seat tilting operation, it is only necessary to rotate the seat close to the desired tilting position in one motion and then make fine adjustments, which shortens the operation time, reduces operator fatigue, and allows the pack seat to be positioned quickly. It can be adjusted to the preference of the seated person.

For example, by applying the device of the present invention to the front seat of a two-door vehicle, the back seat can be tilted significantly forward when getting in and out of the rear seat, making it easier and faster to get in and out. have

[Brief explanation of the drawing]

Figure 1 is a perspective view of a vehicle seat to which the device of the present invention is applied;
Fig. 2 is an exploded perspective view of the device of the present invention, Fig. 3 is a longitudinal sectional view in the locked state, Fig. 4 is a longitudinal sectional view in the unlocked state, and Fig. 5 is a longitudinal sectional view of the device in the unlocked state.
The figure is an explanatory view of the meshing state between the fixed arm and the intermediate toothed plate. In the figure, 11 is a fixed arm, 12 is an intermediate toothed plate, 13 is a movable arm, 14 is an eccentric shaft, 15 is an operating lever, 17 is an internal gear part, 21 is an external gear part, 23 is an internal gear ring part, and 27 is a long hole,
28 is a cam surface, and 29 is an engagement piece.

Claims (1)

[Scope of utility model registration request] a shaft in which the first shaft part is formed at the positive 6 position, the second shaft part is formed in an eccentric position, and the third shaft part is formed in the positive 6 position; a fixed arm that is slidably supported in the axial direction at the second shaft portion and has an internal gear; an intermediate toothed plate having an external gear having a small diameter and a different number of teeth by the height of the teeth; a movable arm having an internal toothed ring portion meshed 1:1 with the external gear of the intermediate toothed plate; a retainer plate supporting an elastic member on which the third shaft portion is pivotally supported and which biases the intermediate toothed plate so as to always mesh with the internal gear of the fixed arm; and a length through which the third shaft portion is penetrated. A hole and an inclined cam surface slidingly contacting the third shaft part in a direction crossing the hole are formed on the circumferential surface of the elongated hole, and an operating lever is pivotally supported by the fixed arm, and the intermediate tooth The external gear of the attachment plate is always meshed with the internal gear of the fixed arm and the internal gear ring of the movable arm, thereby connecting the movable arm to the fixed arm, and by rotating the operating lever, the A joint characterized in that the shaft is moved in the axial direction via a cam surface, the intermediate toothed plate is separated from the internal gear of the fixed arm, and the connection between the fixed arm and the movable arm is released. Angle adjustment and fixing device for members.