JPS6325205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a device for absorbing elongation of an inner cable of a control cable.

More specifically, the present invention relates to an invention for a device that prevents absorption of elastic elongation in a device that automatically absorbs elongation of inner cables.

Conventionally, control cables (hereinafter simply referred to as cables) have been commonly used as a means for remotely controlling devices. That is, the cable consists of a flexible conduit and a flexible inner cable made of stranded steel wire or the like that is slidably inserted into the conduit. Such a cable has a small inertial force, little power transmission loss, and is flexible, so it can be freely curved. Such a cable is used to accurately transmit the pull or push motion of the operating means to the driven device to remotely control the driven device.

As mentioned above, the inner rope of the cable is made of stranded steel wire made by twisting at least several steel wires together, and is particularly suitable for repeated pushing and pulling due to heavy loads such as clutches and brakes of automobiles. Due to the operation, the inner cable gradually stretches over a relatively long period of time during use, and the occurrence of permanent elongation that cannot be avoided is unavoidable. Conventionally, whenever the inner cable stretched, it was necessary to adjust it each time, and the length of the conduit was adjusted using a screw, etc. at the end of the cable, but this was extremely inconvenient, and automatic adjustment was necessary. It is desirable to adjust to As a device to eliminate this drawback, there are conventional Utility Model Application Publications No. 51-79268 and Utility Model Application No. 52-79268.
Ideas such as those disclosed in Publication No. 21358 have been made.

In addition to the above-mentioned permanent elongation, the inner cable also undergoes elastic elongation in which it returns to its original state even if elongation occurs temporarily. The conventional inner cable elongation absorbing device as described above not only absorbs the permanent elongation of the inner cable, but also absorbs the apparent elongation caused by distortion of the vehicle body while running and elasticity caused by overload during operation. Because it absorbs elongation, for example, if this device is used in a clutch mechanism, it may end up in a half-clutch state, causing burnout of the clutch plate, and if used in a brake, it may cause the brake to be pulled. There are disadvantages such as the brake lining being burnt out due to the lingering condition.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the main object of the present invention is to provide an inner cable straightening device that absorbs only the permanent elongation of the inner cable and does not absorb elastic elongation or false elongation.

The inner cable elongation absorbing device of the present invention will be explained with reference to the drawings.

FIG. 1 is a partially cutaway side view showing an embodiment of the device of the present invention, and FIG. 2 is a partially cutaway side view showing the operating state of the device in FIG.

In Fig. 1, a bottomed cylindrical main body 1a and a cover 1
This is a casing consisting of b and a recess 1d provided at an appropriate position on the inner bottom surface 1C. A shaft 2 is assembled inside the casing 1 . A first pulley 3 and a second pulley 7 are rotatably supported on the shaft 2, and are urged by a spring 10 to move away from each other in the axial direction. . A first ratchet tooth is carved on one side of the first pulley, a cavity 6 is provided on the other side, and a projection 5 is provided on the annular side surface. is fitted into a recess 1d provided in the inner bottom surface 1C of the casing 1, and a spiral spring 11 whose one end is engaged with the casing and the other end is engaged with the first pulley is fitted into the cavity 6. is,
The first pulley 3 is urged to rotate in the D direction by the spiral spring 11. One side of the second pulley 7 is carved with second ratchet teeth 8 that can mesh with the first ratchet teeth 4 carved on the first pulley 3, and a cavity 9 is formed on the other side. A spiral spring 11' having one end locked to the casing and the other end locked to the second pulley is fitted into the space, and the second pulley is urged to rotate in the C direction by the spiral spring 11'. ing. An inner cable 1 is provided on the outer peripheral surface of the first pulley 3.
One end of the inner cable 13' is locked and wound slightly in the D direction, and one end of the inner cable 13' is locked on the outer peripheral surface of the second pulley and wound slightly in the C direction.

In the inner cable elongation absorbing device configured as described above, the first pulley 3 and the second pulley 7 are connected to the spring 10.
Since they are separated from each other in the axial direction by
Inner cables 13 respectively locked on the outer peripheral surfaces of both pulleys
and 13' are completely unrelated; the first pulley moves the inner cable 13 in the B direction, and the second pulley moves the inner cable 13' in the B direction.
Appropriate tension is applied in the A' direction by the respective springs 11, 11'. In this case, the other end of the inner cable 13 is locked to an operating means (not shown), and the other end of the inner cable 13' is locked to a driven device (not shown).

To explain the operation and effect of the device of the present invention, in FIG. 1, the inner cable 1 is
3 in direction A, the first pulley is rotated in direction C, and the protrusion 5 fitted into the recess 1d provided in the inner bottom surface 1C of the casing moves into the recess 1.
d and rides on the inner bottom surface 1C as shown in FIG. The second pulley 7 and the second pulley 7 rotate together in the C direction. Therefore, the inner cable 1
3' is wound around the second pulley 7, so that it can be slid in the direction A' to remotely control a driven device (not shown).

Next, when the inner cable 13 is returned to the B direction using an operation means not shown, the inner cable 13' is pulled in the B' direction by the return spring of the driven device not shown, and the inner cable 13' is pulled in the B' direction.
The pulley and the second pulley rotate together in the D direction, and at the position where the return operation is completed, the protrusion 5 of the first pulley fits into the recess 1d of the casing, and at the same time the spring 10
The first pulley 3 moves in the F direction due to the biasing force, the engagement between the first ratchet 4 and the second ratchet 8 is released, and the first pulley and second pulley return to their original positions as shown in FIG. Return to free status.

As described above, when the inner cable 13 on the operating side is operated in the direction A, the first pulley and the second pulley rotate together in the direction C, and the driven device is remotely controlled by the inner cable 13' on the driven side. However, when the normal state is restored by the return operation, the first pulley 3 and the second
Since the pulley 7 is disengaged, not only the elastic elongation of the inner cable that occurs during operation, but also the apparent elongation of the inner cable caused by distortion of the vehicle body that occurs while the vehicle is running, etc., is completely absorbed. It never happens.

If permanent elongation occurs in the inner cable 13 or 13', the first pulley 4 and the second pulley 7 will be applied to the inner cable 13 by the urging force in the winding direction of the inner cable by the spiral springs 11, 11'. The inner cable 13' is in the B direction.
Since an appropriate tension is always applied in the A′ direction, permanent elongation of the inner cable can be automatically absorbed.

As mentioned above, the device of the present invention does not absorb any of the elastic elongation that occurs in the inner cables or the apparent elongation that occurs due to distortion of the vehicle body, and is extremely superior in that it can reliably absorb only permanent elongation. A device for absorbing stretch of inner cables can be provided.

Note that instead of the first ratchet teeth 4 and the second ratchet teeth 8 carved on the first and second pulleys,
It goes without saying that even if a serration or a similar engagement means is provided, it is within the scope of the technical idea of the present application.

[Brief explanation of drawings]

The drawings relate to the present invention, and FIG. 1 is a partially cutaway side view of essential parts showing an embodiment of the device of the present invention, and FIG. 2 shows the operating state of the device in FIG. 1. FIG. 3 is a partially cutaway side view of the main part. 1: Casing, 1C: Inner bottom surface, 1d: Recessed part,
2: shaft, 3: first pulley, 3a: annular side part,
4: Ratchet tooth, 5: Projection, 6: Hole, 7:
2nd pulley, 8: 2nd ratchet tooth, 9: void,
10: Spring, 11, 11': Spiral spring, 12, 1
2': Control cable, 13, 13': Inner cable.

Claims (1)

[Claims] 1. (a) A casing provided near the middle portion of the control cable and having a bottomed cylindrical shape and having a recessed portion in a part of the inner bottom surface; (b) A casing assembled into the casing. (c) a shaft rotatably supported by the shaft, having first ratchet teeth near the outer periphery of one side, a cavity provided on the other side, and a portion of the annular side surface; (d) a first pulley provided with a protrusion that can fit into a recess provided on the inner bottom surface of the casing; (d) a first pulley that rotates within the casing so as to be adjacent to the first pulley and concentric with the axis (e) a second pulley having second ratchet teeth that are freely provided and can mesh with the first ratchet teeth near the outer periphery of one side surface and a hollow space on the other side surface; (f) an elastic member for urging the first pulley and the second pulley in a direction to separate them from each other in the axial direction; a spiral spring that is engaged with a boss provided in the casing, whose other ends are engaged with a first pulley and a second pulley, respectively, and urges the first pulley and the second pulley to rotate in opposite directions; g) an inner cable for power transmission, one end of which is locked to the outer periphery of the first pulley and the second pulley, and which are wound in opposite directions to form substantially one control cable; Automatic stretch absorption device for inner cables.