JPS6344570Y2 - - Google Patents

Description

[Detailed description of the invention] The invention provides a cylindrical fixture made of synthetic resin that is fixed to a mounting member such as a frame to the terminal of the outer casing of a control cable in which the inner cable is freely inserted through the outer casing. The present invention relates to a control cable terminal device fixed by casting, and particularly to a control cable terminal device in which the coupling force of the cylindrical fixture to the outer casing is strengthened.

The control cable, in which the inner cable is freely inserted into the outer casing, is made by winding a plurality of round steel wires tightly in a spiral shape around a synthetic resin liner c, as shown in Figure 1, to form a strand a. an outer casing A which is formed and whose outer periphery is covered with a synthetic resin to form a jacket b, or
As shown in Fig. 2, the outer periphery of a tube d, in which a single flat steel wire is tightly wound in a spiral shape, is covered with a synthetic resin jacket e, and the inner periphery of the tube d is covered with a synthetic resin liner f. The structure is such that the inner cable C is inserted into the fitted outer casing B, and its terminal is cast-in with a cylindrical fixture D made of synthetic resin at the terminal of the outer casing A or outer casing B, as shown in each figure. It is fixed by
This cylindrical fixture D is fixed by fitting the groove h into the frame g to prevent the end from coming off from the cylindrical fixture D due to tensile load being applied to the outer casing A or outer casing B. When outer casing B is used, the end of jacket e is peeled off to expose tube d, and a cylindrical fixture D is cast around the outer periphery of the tube to fill the gap between adjacent flat steel wires. A part of the inner peripheral surface of the cylindrical fixture D was bitten to prevent it from coming off, but because the biting was shallow, the biting part of the cylindrical fixture D became soft when exposed to a high temperature atmosphere. There is a problem that it sometimes comes off easily, but on the other hand,
When using the outer casing A, even if the strand a is exposed and the cylindrical fixture D is cast, it will not work because the round steel wire is wound with a large pitch, unlike the flat steel wire described above. Since there is little snagging and it is not possible to sufficiently prevent the jacket from coming off, we formed unevenness on the outer periphery of the jacket b while still covering it, and made the outer periphery of the jacket b and the inner periphery of the cast-in cylindrical fixing device D. However, since it is a concave and convex bond between synthetic resins, the resistance against coming out is weak, and when exposed to a high temperature atmosphere, the cylindrical fixture D and the jacket B There is a problem that it becomes easy to pull out because the unevenness of both softens, and as another method, after exposing the sland a, take apart the round steel wire and bend the end of the wire outward. A method of cutting the end into the cylindrical fixture D has also been proposed, but this method has the disadvantage of complicating the process and increasing manufacturing costs.

Therefore, the inventor of the present application first applied
In No. 76473, a structure was proposed in which a metal locking ring was fixed to the outer periphery of the end portion of the outer casing by caulking, and a cylindrical fixture was fixed on top of the metal locking ring by casting. The disadvantage was that crimping required extra man-hours. Furthermore, Japanese Patent Publication No. 56-14888 proposes a method in which a spring ring is fitted around the outer periphery of the outer casing and a cylindrical fitting is cast-in. The spring ring is only fixed to the outer casing with a weak bonding force, so if a tensile force is applied to the outer casing in the direction of pulling it out of the cylindrical fitting, the spring ring will pull out from the outer casing with a relatively small force. There were some drawbacks.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a control cable terminal device that has a high bonding force to the terminal of the outer casing of the cylindrical fixture and is easy to manufacture. That is.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings.

In the first embodiment of the present invention shown in FIGS. 3 and 4, a steel plate is press-formed into a truncated conical shape with split grooves 9.
A locking ring 9 shaped like a disc spring is used, and when a tensile force is applied to the cylindrical fixture D fixed from above by casting, the biting part of the inner peripheral edge of the locking ring 9 9b has the advantage that it bites into the jacket b as shown by the chain line in FIG. 4, increasing the bonding force.

A second embodiment of the present invention shown in FIG. 5 uses a locking ring 10 having a large number of claw-like biting parts 10a projecting obliquely on the inner periphery. By biting into b, the same effect as in the first embodiment can be achieved.

Although each of the above embodiments relates to the outer casing A of the type shown in FIG. 1, it is clear that the present invention can also be applied to the outer casing B of the type shown in FIG.

As applied to each of the above embodiments, the control cable terminal device of the present invention applies a tensile force to the inner periphery of the locking ring in a direction in which the outer casing is released from the cylindrical fixation. Since the biting part is formed to be inclined in the biting direction, when a tensile force is applied to the outer casing, the biting part of the locking ring bites into the outer periphery of the outer casing in accordance with the force, so that the outer casing can be attached to the cylindrical fixture. It has the effect of being firmly bonded and reliably preventing it from coming off due to tensile force.

[Brief explanation of the drawing]

1 and 2 are vertical sectional views of a conventional control cable terminal device, FIGS. 3 and 4 show the first embodiment of the present invention, and FIG. 3 is a perspective view of the cylindrical fixture before it is fixed. 4 is a cross-sectional view thereof, and FIG. 5 is a perspective view of the cylindrical fixture of the second embodiment before fixing. A, B: Outer casing, C: Inner cable, D: Cylindrical fixture, b: Jacket, 9,1
0: Locking ring, 9b, 10a: Biting portion.

Claims (1)

[Scope of utility model registration request] An elastic metal locking ring is fitted onto the outer periphery of the terminal portion of the outer casing of the control cable, in which the inner cable is freely inserted into the outer casing whose outer periphery is covered with a synthetic resin jacket. In a control cable terminal device in which a synthetic resin cylindrical fixture is fixed to the terminal portion by casting, a tensile force is applied to the inner periphery of the locking ring in a direction in which the outer casing is released from the cylindrical fixation. Due to the action of
A terminal device for a control cable, characterized in that a biting part is formed on the outer periphery of the outer casing and is inclined in a biting direction.