JPH0352444Y2 - - Google Patents

Description

[Detailed explanation of the idea] 《Industrial application field》 The present invention relates to a reclining device.

<<Prior Art>> As a reclining device of this type, a device is known in which an arm pivotally supported by a base and a lock member each have engaging portions so that the two are directly engaged with each other. That is, the base is attached to a seat cushion frame or the like, and rotatably supports the base end of the arm. Further, the distal end side of the arm is attached to the seatback frame, and an engaging portion is formed in an arc shape around the rotation axis at the periphery of the proximal end. The locking member is operated by an operation knob, and the engaging portion formed at the base end engages with and disengages from the engaging portion of the arm.

In such a reclining device, the rotation of the arm is usually regulated by a locking member due to the engagement of each engagement, and the seat back is fixed at a predetermined inclination angle. Further, when the engaging portion of the lock member is disengaged from the engaging portion of the arm by operating the operating knob, the arm becomes freely rotatable and the seat back can be displaced to a desired angle of inclination.

Note that a spiral spring is installed between the base and the arm to support the arm and prevent the seat bag from falling backwards when the engaging portion is disengaged.

<<Problems to be solved by the invention>> However, such conventional reclining devices have a structure in which the arms are locked by directly engaging the engaging portions of the arms and the locking members, so small angle adjustments cannot be made. In order to make this possible, it is necessary to reduce the pitch of the meshing portions, which has a drawback in terms of strength and increases in manufacturing costs.

Therefore, an object of the present invention is to provide a reclining device that allows fine angle adjustment.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the reclining device of the present invention is concentrically integrated or substantially integrated with a base provided on the seat cushion side. , a large gear and a small gear rotatably supported on the base; a hub portion rotatably supported on the base and formed at the base end engages with the small gear; The arm includes an arm whose side is joined to the seat back frame, and a lock member which is rotatably supported by the base and whose rack portion formed at the base end is engaged with and disengaged from the large gear by means of an operation knob. It is characterized by

<<Operation>> By the engagement of the large gear and the locking member, rotation of the arm engaged with the small gear is restricted, and angle adjustment is performed in small increments.

<<Embodiment>> FIG. 1 is a partially omitted exploded perspective view of a reclining device showing an embodiment of the present invention.

This reclining device includes a base 1, an arm 2, a lock member 3, and a pair of large and small gears 4, 5.
This is the one with the attached.

The base 1 is formed into a plate shape and is fixed to a side bracket of a seat cushion frame (not shown) by bolts or the like. Note that a cover body (not shown) is attached to the outside of the base 1.

Further, as shown in FIG. 2, the base end of the arm 2 is rotatably supported on the base 1 by a shaft 6, and the distal end is connected to a side bracket of a seatback frame (not shown) by bolting or the like. has been done. Note that the reclining device in this embodiment is provided only on one side of the seat, so the base end of the seatback frame on the opposite side of the reclining device is connected directly to the seat cushion frame via the side bracket. movably supported.

Further, an arcuate hub portion 7 centered on the shaft 6 is formed on the periphery of the base end portion of the arm 2 . This hub portion 7 has a relatively large pitch and is designed to mesh with the small gear 5. Note that the radius of curvature of the hub portion 7 is set to be approximately 2.5 times the radius of the small gear 5.

Further, the large gear 4 and the small gear 5 are integrally formed concentrically, and are rotatably supported on the base 1 by a common shaft 8 with the small gear inside.

The small gear 5 is connected to the hub portion 7 of the arm 2 as described above.
It has a relatively large pitch corresponding to the hub portion 7.

Further, the large gear 4 has a diameter approximately twice that of the small gear, and is formed with a smaller pitch than the small gear 5.

The lock member 3 is rotatably supported on the base 1 by a shaft 9, and has a rack portion 1 formed at its base end.
0 meshes with the large gear 4. That is, this rack portion 10 is formed into a slightly arcuate concave shape corresponding to the outer peripheral shape of the large gear 4, and has the same pitch as the large gear 4. Furthermore, an operating knob 11 is connected to the distal end of the lock member 3, as shown in FIG. Further, a tension coil spring 12 is installed between the lock member 3 and the base 1 to bias the rack portion 10 toward the large gear 4.

Therefore, in such a reclining device, the rotation of the gears 4 and 5 and the arm 2 is locked with the rack portion 10 of the locking member 3 meshing with the large gear 4 due to the tension of the tension coil spring 12.
The seat back is fixed at a predetermined inclination angle. Further, as shown in FIG. 4, by rotating the operation knob 11 and disengaging the rack part 10 from the large gear 4, the gears 4 and 5 and the arm 2 are unlocked, and the seat bag is rotated. It is movable and can be displaced to any desired angle. In this case, the seat bag is resiliently rotated forward by a spiral spring (not shown) disposed between the base 1 and the arm 2, and is prevented from falling backward.

In the reclining device configured as above, the rotation angle of the arm 2 is controlled by the small gear 5 to approximately
Since the outer circumferential distance of the small gear is approximately doubled by the large gear 4, the moving distance of the hub portion 7 relative to the rotation of the arm 2 is approximately 5 times that of the large gear 5. It will be expanded to. Therefore, the large gear 5 and the rack portion 10 of the lock member 3
arm 2 without making the pitch extremely small.
The rotation angle can be adjusted in small increments. Further, since the arm 2 is engaged with the small gear 5 through the hub portion 7 having a relatively large pitch, a supporting state with sufficient strength can be obtained.

FIG. 5 is a partially omitted perspective view of a reclining device showing another embodiment of the present invention.

This reclining device supports both base ends of a seatback frame by a pair of left and right arms 22, and includes a pair of bases 21 that support each arm 22, and a lock member provided on one base 21. 23, a connecting shaft 20 installed between each base 21, a large gear 24 provided at the end of the connecting shaft 20 on the lock member 23 side, and a pair of connecting shafts 24 provided near both ends of the connecting shaft 20, respectively. It is configured to include a small gear 25.

As shown in FIG. 6, each arm 22 is arranged inside the base 21, is rotatably supported via a shaft 26, and has a hub portion 27 at its base end.
is formed.

Moreover, the large gear 24 and each small gear 25 are each fixed to the connecting shaft 20 and are substantially integrated.

The large gear 24 is disposed on the outside of the base 21 on one side and is adapted to mesh with the rack portion 28 of the locking member 23. In addition, the lock member 23
The operation is the same as in the previous embodiment.

Further, each small gear 25 is arranged inside the base 21, and meshes with the hub portion 27 of the arm 22 described above. In addition, each small gear 25
is formed so that the angle of each tooth is shifted by 1/2 pitch from each other, as shown in Figure 7.
Along with this, the teeth of the hub portion 27 of the arm 22 are also 1/2
They are formed with different pitches. This eliminates looseness due to bumps and the like, and provides a stable meshing condition.

In such a reclining device, by operating the operating knob 29 on one side and disengaging the rack part 28 of the locking member 23 from the large gear 24, the connecting shaft 20 becomes rotatable, and each small gear 25
The arm 22 and the seat bag are rotated together with the rotation of the arm 22 to be displaced to a desired angle of inclination.

With this reclining device, the angle of the seat back can be adjusted in small increments, as in the previous embodiment. In addition, with this structure, the base end of the seatback frame is reinforced by the connecting shaft 20 provided between the bases 21, and the strength of the seatback frame can be improved, and the tilting operation of the seatback can also be improved. The seat back frame can be made more stable, and the overall structure of the seat back frame can also be simplified.

Further, with such a structure, the number of parts can be reduced compared to the case where conventional reclining devices are provided on both sides.

<<Effects of the invention>> As explained above, according to the invention, the locking member locks the arm through the large gear and small gear, so the pitch of the rack part and the hub part can be made extremely small. The inclination angle of the arm can be adjusted in small increments without having to do so.
Therefore, a stable support state with sufficient strength can be obtained, and manufacturing costs can be reasonably reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted exploded perspective view of a reclining device showing one embodiment of the present invention, and FIG.
FIG. 3 is a schematic side view of the reclining device shown in FIG. 1 in a locked state;
4 is a schematic side view of the reclining device shown in FIG. 1 in an unlocked state, FIG. 5 is a partially omitted perspective view of the reclining device showing another embodiment of the present invention, and FIG. 6 is a schematic side view of the reclining device shown in FIG. A sectional view of a main part explaining the structure of the reclining device shown in FIG.
7 is a side view showing a pair of small gears provided in the reclining device shown in FIG. 5. FIG. 1,21...Base, 2,22...Arm, 3,2
3... Lock member, 4, 24... Large gear, 5, 25...
Small gear.

Claims (1)

[Scope of utility model registration request] concentrically integrated or substantially integrated with a base provided on the seat cushion side;
A large gear and a small gear are rotatably supported on the base, and a hub portion rotatably supported on the base and formed at the base end engages with the small gear, and the base end side is rotatably supported on the base. The seat back frame includes an arm that is connected to the seat back frame, and a lock member that is rotatably supported on the base and whose rack portion formed at the base end is engaged and disengaged from the large gear using an operation knob. Features a reclining device.