JPS6348803Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the mechanism of a device that absorbs the elongation of the inner cable of a control cable.

More specifically, the present invention relates to a mechanism for preventing excessive absorption of elongation in a device that automatically absorbs elongation of inner cables.

Conventionally, control cables (hereinafter simply referred to as cables) have often been used as a means of 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 susceptible to repeated operations with heavy loads such as in automobile clutches and brakes. The inner cable gradually stretches over a relatively long period of time during use, and the occurrence of permanent elongation that does not return to its original state cannot be avoided. Conventionally, adjustment has been required each time, and the length of the conduit has been adjusted using a screw or the like at the attachment end of the cable, but this is extremely inconvenient, and it is desirable to adjust the length automatically. 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 absorbs not only the permanent elongation of the inner cable but also the elastic elongation. For example, when this device is used for clutch operation, Since it also absorbs the apparent elongation caused by distortion of the vehicle body and elastic elongation caused by overload during operation, the clutch device may end up in a half-clutch state, resulting in burnout of the clutch plate, or when used for braking. In such cases, the brake remains applied, resulting in burnout of the brake lining.

In view of the above-mentioned drawbacks, the main object of the present invention is to provide a mechanism for an inner cable lengthening device that absorbs only the permanent elongation of the inner cable and does not absorb elastic elongation or apparent elongation.

To explain the mechanism of the present invention using drawings, in FIGS. 1 and 2, 1 and 1' are control cables, and 2 and 2' are conduits, the ends of which are fixed to both ends of the casing 4, respectively. cage, conduit 2,
Inner cables 3, 3' are slidably inserted into the inner cable 2'. One end of a ratchet member 5 is fixed to the end of the inner cable 3', and ratchet teeth 6 are carved on the inner peripheral surface of the other end of the ratchet member.
is biased toward the operating side, that is, to the right in the drawing. Furthermore, the end of the inner cable 3 is inserted into an inner cable through hole 8 formed in an adjustment member 7 that is slidably fitted into the ratchet member 5, and a tapered part 12 is provided at the end. A nipple 11 is fixed thereto. The adjusting member 7 is provided with a ratchet pawl holding hole 9 penetrating from the outer peripheral surface to the inner peripheral surface, and the ratchet pawl holding hole 9 and the nipple 11 are connected to each other.
The ratchet pawl 10 is held by the nipple 11, and the ratchet pawl 10 is configured to protrude and retract from the outer circumferential surface of the adjusting member 7 in the radial direction by sliding the nipple 11 in the directions A and B. Furthermore, the adjustment member 7 is biased by a spring 14 toward the driven device, that is, toward the left in the drawing, and comes into contact with a stopper 4a provided on the casing 4, so that its sliding toward the driven device is restricted at a certain position. .

To explain the function and effect of the mechanism according to the present invention, when the inner cable 3 is pulled and slid in the B direction by an operating means (not shown), the nipple 11 is fixed to the end of the inner cable 3 and moves in the B direction. As shown in FIG. 2, the ratchet pawl 10 in contact with the nipple rides on the tapered portion 12 and moves outward in the radial direction of the nipple within the ratchet pawl holding hole (hereinafter referred to as the holding hole) 9, so that the adjusting member At the same time, it projects from the outer surface of the ratchet member 7 and engages with ratchet teeth 6 carved in the ratchet member 5, so that the ratchet member 5 and the adjusting member 7 are integrally connected. When the inner cable 3 is further pulled in the direction B in this state, the inner cable 3' fixed to the ratchet member 5 moves in the direction B, allowing accurate remote control of a remote driven device (not shown). .

Next, when the inner cable 3 is returned to the direction A using the operating means, the integrated ratchet member 5
The adjustment member 7 slides in the A direction, and both members stop at a position where the tensions of both inner cables 3 and 3' are balanced, and only the nipple 11 fixed to the end of the inner cable 3 moves further in the A direction. As the ratchet pawl 10 moves, it comes off the tapered part 12 and retracts radially inward, and the engagement between the ratchet member 5 and the adjustment member 7 is released, and the connection between the inner cables 3 and 3' is released, resulting in a free state. Become. In particular, the inner cable 3' is biased to the right in the drawing by the spring 13. That is, in the normal state, the inner cables 3 and 3' are in a free state, and when the inner cable 3' stretches, the ratchet member 5 is moved in the direction B by the bias of the spring 13, so that the mechanism is not operated. In the case of pulling operation by the means, even if the inner cable 3' is stretched, the stretching action is completed by the movement of the ratchet member in the B direction by the spring 13, so the sliding stroke of the inner cables 3, 3' is It is possible to accurately remotely control the driven equipment regardless of the length of the cable.

By providing a stopper 4a in the casing 4 against which the end of the adjusting member 7 comes into contact, the sliding movement of the adjusting member 7 in the A direction is restricted at a certain position, thereby making it possible to return the inner cable in the A direction. There is an effect that the engagement between the ratchet member 5 and the adjusting member can be reliably disengaged during operation.

In addition, in the mechanism of the present invention, the inner cables 3 and 3' are connected and slid only when the operating means is pulled, so even if an overload operation that causes elastic elongation of the inner cable is performed, the inner cables will not have elasticity. This is an idea that can provide a mechanism that can exhibit an extremely excellent effect that has never been seen before, as absorbing elongation is something that never happens.

[Brief explanation of the drawing]

The drawings are related to the present invention, and Fig. 1 is a partially cutaway side view of the main parts of the mechanism of the present invention in its normal state, and Fig. 2 shows the mechanism in a state in which it is in operation compared to the normal state shown in Fig. 1. FIG. 3 is a partially cutaway side view of the main part. 1: control cable, 2: conduit, 3: inner cable, 4: casing, 4a: stopper, 5: ratchet member, 6: ratchet tooth, 7: adjustment member,
8: Inner cable through hole, 9: Ratchet claw holding hole, 1
0: Ratchet pawl, 11: Nipple, 12: Tapered part, 13, 14: Spring.

Claims (1)

[Claims for Utility Model Registration] 1. A flexible conduit and an inner cable made of stranded steel wire etc. inserted into the conduit so as to be slidable, and a driven device can be controlled remotely by pulling the inner cable on the operating side. The control cable to be operated includes a casing in which the bisected ends of the conduit are fixed at both ends thereof, and an inner cable on the driven device side is slidably inserted into the casing, and an inner cable on the driven device side is fixed at one end, and the other end is fixed. spiral or annular ratchet teeth are provided on the inner circumferential surface of the actuator, and a ratchet member is biased toward the operating means by a spring; An inner cable through-hole is drilled through the inner cable on the operating means side, and ratchet pawl holding holes are drilled in at least two places on the outer circumferential surface of the inner cable, and the ratchet claw holding holes penetrate from the inner circumferential surface to the outer circumferential surface. A ratchet claw is fitted into the claw holding hole so as to protrude from its outer circumferential surface and can be retracted freely, and the end of the inner cable inserted into the through hole of the adjustment member, which is biased toward the driven device by a spring, has a tip. The inner diameter of the control cable is characterized in that a nipple is fixed, the outer diameter of one end being thick, the other end being thin, and a tapered part being provided in the middle part, and the ratchet pawl is brought into contact with the nipple. Cable stretch absorber. 2. The control cable according to claim 1, which is a registered utility model, characterized in that a stopper is provided at an appropriate position of the casing to limit sliding of the adjustment member toward the driven device at a certain position. Inner cable stretch absorption device.