JPS6235941Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cap member secured to the end of a conduit of a push/pull control cable.

Conventionally, for push-pull control cables (hereinafter simply referred to as cables), the clearance between the inner diameter of the conduit and the outer diameter of the inner cable inserted into the conduit has been adjusted to ensure the transmission of operating force, especially during push operations. , and the clearance between the inner diameter of the cap member and the outer diameter of the cable end fitting that slides inside the cap,
It is desirable to minimize it as much as possible. In particular, in the case of the cap member 21 having the guide hole 22 as shown in FIG. The guide hole 22 is much larger than the outer diameter of the terminal fitting 26, so that the flange 27 provided at one end of the terminal fitting 26 slides into it, and there is a clear run between the inner and outer diameters. To ensure accurate operation of the cable, the amount of interference is kept to a minimum.

Generally, this type of cap member is coated with a lubricant such as grease so that the guide hole 22 and the flange 27 can slide smoothly.

If the terminal fitting 26 is suddenly slid in the direction A in this state, the flange 27 in FIG.
The air on the left side of the flange is difficult to move to the right side of the flange due to the lubricant present in the gap between the guide hole 22 and the flange 27. This creates negative pressure, which causes the cable to slide more slowly. Furthermore, when the terminal fitting that has been slid in direction A is moved in direction B, the air on the left side of the collar becomes negative pressure, causing the boot to contract extremely and at the same time compressing the air on the right side of the collar, so that the cable slides smoothly. inhibit movement. In any case, the air on both sides of the collar gradually moves to the opposite side by manipulating the cable, but cable manipulation generally involves a sudden push or pull, and the sudden action causes the air to move to the opposite side. This has the disadvantage that it hinders the sliding of the cable because it cannot accommodate the movement of the cable.

In view of the above-mentioned drawbacks of the conventional art, an invention as disclosed in Japanese Patent Application Laid-open No. 150611/1983 has been made to overcome these problems. In other words, ventilation holes and ventilation grooves are provided to communicate the space on the left and right sides of the flange provided on the terminal member, so that air can easily move by sliding the terminal member from side to side. be.

However, when actually providing ventilation holes in the flange, for example, it is difficult to create large ventilation holes due to space limitations, and many small ventilation holes are provided to facilitate the movement of air. Even in this case, a lubricant such as grease is actually applied to the cap member so that the flange slides smoothly. It may not be possible to move easily.

Furthermore, if the inner diameter of the cap member on which the flange slides is made to have an irregular cross section, such as a polygon, to facilitate the movement of air within the cap member, it would be extremely difficult to manufacture it. Therefore, there are problems such as the fact that it becomes expensive.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional cables, it is an object of the present invention to provide a cap member for a push-pull cable in which the operation of the cable is not inhibited by the enclosed air every time the terminal fitting is slid.

To explain the cap member of the present invention with reference to the drawings, 1 is a cap member, 2 is a guide hole, 3a, 3
Reference numeral b denotes a first ventilation hole provided substantially coaxially with the cap member in the axial direction and penetrating outward from the guide hole in the radial direction. 4 and 4' are elastic sealing members and the first
Ventilation grooves 4a and 4a' are provided on the inner circumferential surface of the elastic sealing member, which is covered with the ventilation holes 3a and 3b, respectively, and a second passageway penetrating to the outside is provided in the annular ventilation grooves 4a and 4b. Pores 4b and 4b' are provided. Note that it is desirable that the first ventilation hole and the second ventilation hole are located on substantially opposite sides. Reference numeral 6 designates a cable end fitting having a collar portion 7 at one end and an engaging portion 8 at the other end, reference numeral 9 an inner cable, and reference numeral 10 a boot.

To explain the function and effect of the cap member of the present invention with reference to FIG. 1, by sliding the terminal fitting in the direction A, the air on the right side of the flange 7 becomes a negative pressure, but the first ventilation hole 3a It communicates with the outside air through the second ventilation hole 4b' through the annular ventilation groove 4a', so the outside air is taken in through the second ventilation hole 4b', and at the same time, the compressed air on the left side of the collar is drawn through the first ventilation hole 2b. The boot 10 is not inflated by being discharged from the second ventilation hole 4b through the annular ventilation groove 4a.

In this way, the inner cable 6 can smoothly slide in the A direction.

Next, when the terminal fitting that has been once slid in the A direction is slid in the B direction, the compressed air on the right side of the collar 7 will flow from the first ventilation hole 3a through the annular ventilation groove 4a' to the second
The air that is discharged from the ventilation hole 4b' and becomes negative pressure on the left side of the collar passes through the annular ventilation groove 4a from the first ventilation hole 3b, and outside air is sucked in from the second ventilation hole 4b, so that the boots do not contract. The inner cable 9 smoothly slides in the B direction.

In the structure as described above, the first ventilation hole 3a,
The reason why the elastic seal members 4, 4' are fitted so that the second ventilation holes 4b, 4b' are located on the substantially opposite side to the cap member 3b is to prevent rainwater and dust from easily entering the cap member. The purpose is to

As mentioned above, the cap member of the present invention has a structure in which the ventilation hole communicates with the outside air, which overcomes the various disadvantages described above due to the movement of air only within the cap member as in the conventional case, and makes it possible to maintain a smooth cable. It is possible to provide an excellent cap member that can provide sliding properties, and also has a structure that can be improved by simply drilling a ventilation hole in a conventional general cap member of this type and fitting an elastic seal member. Because of its high quality, it can also provide excellent effects at a relatively low price.

[Brief explanation of the drawing]

The drawings are according to the present invention, and Figure 1 is a partially cutaway side view of the main part of the cap member of the present invention;
FIG. 2 is a partially cutaway side view of the main parts of a conventional cap member. 1: Cap member, 2: Guide hole, 3a, 3
b: first ventilation hole, 4, 4': elastic sealing member, 4
a, 4a': annular ventilation groove, 4b, 4b': second ventilation hole.

Claims (1)

[Scope of utility model registration request] In the cap member fixed to the end of the conduit of the push-pull control cable, the guide hole is inserted radially outwardly in the vicinity of the opening of the axial guide hole provided in the cap member and at an appropriate position near the bottom. Each cap member includes at least one first ventilation hole and an annular elastic sealing member that covers the outer peripheral surface of the cap member so as to cover the first ventilation hole, and an annular ventilation recess is formed in the inner peripheral surface of the elastic sealing member. a groove, and at least one second vent hole penetrating outwardly is provided at a suitable position in the annular vent groove, and the first vent hole opens in the outer circumferential surface of the cap member. A cap member for a push/pull control cable, characterized in that the cap member is covered so that the second ventilation hole is located on the same outer peripheral surface of the cap member on the substantially opposite side.