JPH0336293Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a reclining device that adjusts the reclining angle by converting rotation of an operating handle into tilting of an upper arm via a handle shaft and a planetary gear mechanism.

(Prior Art) Examples of this type of reclining device include those shown in FIGS. 7 to 9. In these figures, 1 is a lower arm fixed to the seat cushion side (seat cushion frame) with screws or the like, and 2 is a lower arm similarly fixed to the seat back side (seat back frame).
An inner gear 2a is embossed on one side of the upper arm 2 by precision press processing or the like. In addition, there are holes 2e and 2f in the upper part of the upper arm 2 where it is attached to the seatback frame.
is drilled as a mounting hole to the seat back frame. Reference numeral 3 denotes a sub-plate disposed adjacent to the upper arm 2. An outer gear 3a is embossed on the side surface of the upper arm 2 facing the inner gear 2a by precision press processing, etc., and the lower part thereof is attached to the lower arm 1 by a rivet 4. It is fixed. The number of teeth of the inner gear 2a is selected to be at least one more than the number of teeth of the outer gear 3a.

5 is an eccentric part 5a and a concentric part 5 connected thereto;
b, 5c, etc., with an eccentric portion 5a
is rotatably inserted into the rotational center hole of the upper arm 2, the concentric portion 5b is rotatably inserted into the bush 6 of the lower arm 1, and the concentric portion 5c is rotatably inserted into the center hole of the sub-plate 3. has been done. Furthermore, the end of this rotating shaft 5 (the concentric part 5c side)
A sprocket 7 is attached to the rotary shaft 5 so as to rotate together with the rotary shaft 5. With the above configuration, the inner gear 2a of the upper arm 2
and the outer gear 3a of the sub-plate 3 mesh,
A planetary gear mechanism is formed.

A handle shaft 8 is rotatably supported by the lower arm 1 and a cover bracket 9 fixed to the lower arm 1. A sprocket 10 is integrally formed between the lower arm 1 and the cover bracket 9. ing. And this handle shaft 8
A serration portion 8a for attaching an operating handle 11 is provided at a portion projecting outward from the cover plate 9. Reference numeral 12 denotes a chain wound between sprockets 7 and 10, and an intermediate portion of the chain 12 is guided by chain guides (sprockets) 13 and 14.

Furthermore, reference numerals 15 and 16 are hook members that are locked to the upper arm 2, and their heads 15a and 16a limit the distance between the lower arm 1 and the sub-plate 3. The body portion 16b of the hook member 16 also functions as a stopper for regulating the adjustment range of the reclining angle. That is, the body 16b of the hook member 16 is located within the notch 3e of the sub-plate 3, and prevents the upper arm 2 from tilting within the range where the front end 3f and rear end 3g of the notch 3e abut against the body 16b. It is allowed. In addition, 17 is an elastic member (rubber,
The ring is made of synthetic resin, etc. and is disposed between the lower arm 1 and the upper arm 2 to absorb the lateral play as shown in FIG.

In this reclining device, when the operating handle 11 is rotated, the handle shaft 8 and the sprocket 10 integrally formed therewith are rotated, and the rotating shaft 5 is also rotated via the chain 12 and the sprocket 7. . Therefore, the upper arm 2 is also tilted at a constant reduction ratio by the planetary gear mechanism.

(Problem to be Solved by the Invention) In this reclining device, if one tries to turn the operating handle 11 with strong force without noticing that the movement of the upper arm 2 side is restricted, High torque (excessive torque)
There were cases in which the mechanical parts of the reclining device (for example, sprockets 7 and 10) were damaged. On the other hand, strengthening the mechanism to withstand this high torque will increase the cost of the reclining device.

This idea was created in view of the above problems.
The purpose is to provide a reclining device that can prevent damage to the mechanism.

(Means for Solving the Problems) The present invention which solves the above problems includes a lower arm and an inner gear fixed to the seat cushion side, an upper arm having a through hole concentric with the inner gear and fixed to the seat back side. , an outer gear meshing with the in-gear of the upper arm, a sub-plate having a through hole concentric with the outer gear and fixed to the lower arm, and a concentric portion and an eccentric portion rotating in the through hole of the sub-plate and the through hole of the upper arm. A rotating shaft movably inserted and rotatably supported by the lower arm, an operating handle rotatably attached to the lower arm, a sprocket on the operating handle side, and a sprocket on the rotating shaft side. A reclining device comprising a chain parallel to a sprocket and converting the rotation of the operating handle into a tilting motion of the upper arm via the chain and gear train to adjust the reclining angle, the operating handle Alternatively, the sprocket is characterized by having a torque limiter mechanism for limiting transmittable torque at at least one of the engagement portions between the sprocket and the shaft to which they are attached.

(Function) In the reclining device of the present invention, the operating handle idles due to the torque limiter mechanism in response to excessive torque. Therefore, the torque that can be transmitted by operating the operating handle is limited to a certain value or less, so damage to the mechanism can be avoided.

(Example) Hereinafter, an example of the present invention will be described in detail using FIG. 1 and FIG. 2. The configuration other than the parts shown in FIGS. 1 and 2 is the same as that shown in FIGS. 7 to 9. In this embodiment as well, like the conventional device, a recess 11a is provided on the operating handle 11 (boss portion) side, and a protrusion 8d is provided on the handle shaft 8 side, but their shapes are different. That is, the shape of the recess 11a is such that a perfectly circular hole is bored in the center, and vertically elongated substantially elliptical holes are bored on both sides of the hole, overlapping the perfectly circular holes. A pair of rectangular leaf springs 19 are fitted at the intersection of the perfect circle and the ellipse. On the other hand, the convex portion 8d has an oval cross section, and as shown in FIG. ing. Further, since there is a gap on the outside of the leaf spring 19, outward deformation is possible.
Attachment of the operating handle 11 to the handle shaft 8 is as follows:
Similar to the conventional device, this is done by inserting the protrusion 8d into the recess 11a (inside the leaf spring 19) and inserting the snap ring 18 into the ring locking groove of the protrusion 8d to prevent it from coming off.

With this configuration, a torque limiter mechanism is formed that limits the torque transmitted from the operating handle 11 to the handle shaft 8 to a constant value,
Damage to the mechanism can be prevented. That is, even if excessive torque is applied to the operating handle 11 in a state in which the Atsupah arm 2 cannot be rotated, the leaf spring 19 will deform outward, the operating handle 11 will idle, and the handle shaft 8 will be rotated below a certain value. of torque is transmitted. Therefore, excessive torque is not transmitted to the mechanism section, and it can be protected.

Note that the torque limiter mechanism is not limited to the above-mentioned embodiment, and various modifications can be made. For example, the third
It can also be configured as shown in the figure. Figure 3 A shows the perfect circular hole (recess 11a) in the operating handle 11.
3 has three longitudinal grooves in the axial direction, into which triangularly bent leaf springs 19 are fitted. Figure 3(b) has four rectangular leaf springs 19 fitted into the recess 11a, with a convex shape. Three and four flat portions are formed on the outer peripheral surface of the portion 8d, respectively, and these flat portions face the inner surface of the leaf spring 19.

FIG. 4 is an explanatory diagram showing still another embodiment of the present invention, in which the operating handle 11 itself has the function of a leaf spring 19. That is, when a moderate torque is applied to the operating handle 11, the tongue portion 11b is elastically deformed outward and the operating handle 11 is moved idly relative to the convex portion 8d.
1 itself. Based on the same idea, the operating handle 11 may be provided with a thin portion 11c for elastic deformation, as shown in FIGS. 5A to 5B. Furthermore, the fifth
Regarding Figure C, the convex portion 8d is not oval-shaped, but approximately wedge-shaped grooves are provided in the axial direction at 90° intervals, and here,
A protrusion protruding from the inner peripheral surface of the thin portion 11c is fitted. The configuration as shown in FIGS. 4 and 5 above is advantageous because the number of parts can be reduced.

Furthermore, as shown in FIG. 6, the sprocket 7 is provided with a recess (in this case, a through hole) 7a having a similar shape to that shown in FIG. It may also be configured such that the oval cross-sectional portion of the shaft 5 is inserted. Of course, the sprocket 10 may have such a configuration.

(Effects of the Invention) As described above, according to the present invention, even in the torque limiter mechanism, the torque that can be transmitted by operating the operating handle is limited, so damage to the mechanism can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the main parts of an embodiment of the present invention, Fig. 2 is a front view showing the main parts of the embodiment of Fig. 1, and Figs. FIGS. 7 to 9 are explanatory diagrams of the conventional example, FIG. 7 is an enlarged sectional view along AA of FIG. 8, FIG. 8 is a configuration diagram of the main parts, and FIG. The figure is BB in Figure 8.
It is an enlarged sectional view. 1...Lower arm, 2...Atsupa arm, 3...
...Subplate, 4...Rivet, 5...Rotating shaft, 5a...Eccentric part, 5b, 5c...Concentric part, 7, 10...Sprocket, 7a, 11a...
...Concave portion, 8...Handle shaft, 8a...Serration portion, 8d...Convex portion, 9...Cover bracket,
11...Operation handle, 12...Chain, 1
5, 16...Hook member, 17...Ring, 18
...Snat spring, 19,20...Plate spring.

Claims (1)

[Scope of utility model registration request] A lower arm fixed to the seat cushion side, an upper arm fixed to the seat back side having an inner gear and a through hole concentric with the inner gear, an outer gear meshing with the inner gear of the upper arm and a through hole concentric with the outer gear. and a sub-plate fixed to the lower arm, and a rotating shaft having a concentric part and an eccentric part rotatably inserted into a through-hole of the sub-plate and a through-hole of the upper arm, and rotatably supported by the lower arm. A movable shaft, an operating handle rotatably attached to the lower arm, and a chain suspended in parallel between a sprocket on the operating handle side and a sprocket on the rotary shaft side, The reclining device adjusts the reclining angle by converting the movement into a tilting movement of the upper arm via the chain and gear train, and at least one of the engaging portions between the operating handle or the sprocket and the shaft to which these are attached. A reclining device that has a torque limiter mechanism that limits the torque that can be transmitted.