JPH0645014A - Different diameter tube contracted at room temperature - Google Patents

Abstract

PURPOSE:To prevent an excessive tensile stress from remaining in a tube positioned in a portion of the largest outer diameter in the case where a member to be fitted, having partly different outer diameters in the axial direction, is covered with the tube contracted at room temperatures. CONSTITUTION:A hollow elastic rubber mold tube member is molded in approximately the same shape as a member to be fitted, having partly different outer diameters in the axial direction, a dimension in the direction perpendicular to the axis smaller than that of the member to be fitted, and an axial length larger than that of the member to be fitted. A diameter of the tube member is enlarged over the whole length to such an extent as to be disposed in the largest outer diameter portion of the member to be fitted. A spacer 3 is provided in the hollow portion having the enlarged diameter. As required, a rib having a suitable shape is attached to the edge of the hollow elastic rubber mold tube member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold-shrinkable tube used for end treatment of wires and cables, straight connection, etc. Related to cold shrink tube.

[0002]

2. Description of the Related Art Conventionally, a cold shrink tube disclosed in Japanese Patent Application No. 1-89564 has been used.
In order to mechanically expand the diameter of the elastic rubber tube and hold it in the expanded state, a spacer made of hard polyethylene or the like that can be disassembled into a string shape is attached to the expanded hollow portion. This type of cold-shrink tube has been applied to those having a small difference in the outer diameter of the body to be fitted in the axial direction. The inner diameter of the tube before expansion is designed so that it can cover the portion of the minimum outer diameter in the axial direction of the fitting body with an appropriate pressing force, and the expansion is performed in the axial direction of the fitting body. It was processed so that the maximum outer diameter part could be easily covered. Therefore, when the difference in the outer diameter in the axial direction of the body to be fitted is large, it is necessary to expand the diameter to a value close to the limit value at which the rubber elasticity of the elastic rubber tube can be held. The elastic rubber tube of the maximum outer diameter portion is always in an excessively stretched condition during use, and for example, the elastic rubber tube may be torn by an external impact such as a slight impact with the needle tip. Had a point.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made to solve the above problems.

[0004]

[Means for Solving the Problems] The shape is almost the same as the body to be fitted, the outer diameters of which in the axial direction are partially different, and the dimension in the direction perpendicular to the axis is smaller than the dimension of the body to be fitted. After molding a hollow elastic rubber mold tube whose length is longer than the length of the body to be fitted, the diameter was expanded and expanded over the entire length so that it could be attached to the maximum outer diameter part of the body to be fitted. The spacer is attached to the hollow part. Further, if necessary, a rib having an appropriate shape is provided at the edge of the hollow elastic rubber mold tube body.

[0005]

[Function] The elastic rubber mold tube body before the diameter expansion is
The shape is similar to the shape of the body to be fitted and is slightly smaller, and the diameter expansion is performed over the entire length so that it can be attached to the maximum outer diameter part of the body to be fitted. As described above, excessive tensile stress does not remain in the maximum outer diameter portion. Further, the appropriately shaped rib provided at the edge of the elastic rubber molded tube body acts as a reinforcing layer against a mechanical impact force from the outside and can prevent the occurrence of tears and cracks.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings showing an embodiment of the present invention, the outer shape in the axial direction is substantially the same as that of the fitted object, and the dimension in the direction perpendicular to the axis is the same as the fitted object. After molding a hollow elastic rubber mold tube body 1 that is smaller than the size and has an axial length longer than the length of the body to be fitted, the entire length can be attached to the maximum outer diameter portion 2 of the body to be fitted. That is, the spacer 3 is appropriately expanded in diameter, and the spacer 3 is attached to the expanded hollow portion. Ethylene propylene rubber, silicone rubber and the like are suitable as the elastic rubber. Also,
When the ribs 4 having an appropriate shape are provided at the edges of the hollow elastic rubber molded tube body, the ribs 4 act as a reinforcing layer against a mechanical impact force from the outside, and it is possible to prevent the occurrence of tears and cracks. As the spacer, those disclosed in Japanese Patent Application No. 1-89564 can be used. The finished product has a tube shape as shown in FIGS. 2 and 5, or a shape substantially similar to the fitting body as shown in FIGS. 3 and 6, and the spacer 3 is put on the fitting body. Is removed,
It fits well into objects with different diameters.

[0007]

[Effect] Since the present invention is configured as described above,
It has the following effects. (1) Excessive tensile stress does not remain in the portion of the tube attached to the maximum outer diameter portion of the body to be fitted, so that the tube is not torn by a small external impact. (2) The ribs at the edges act as a reinforcing layer and prevent the occurrence of tears and cracks from the edges. (3) Fits well to the body to be fitted. It has excellent effects such as, and its industrial utility value is extremely high.

[Brief description of drawings]

FIG. 1 is a hollow elastic rubber molded body before diameter expansion showing one example of the present invention.

FIG. 2 is a front view showing a state in which a spacer is attached to a hollow elastic rubber mold body having an enlarged diameter.

FIG. 3 is a front view showing a state in which a spacer is attached to a hollow elastic rubber mold body whose diameter is expanded.

FIG. 4 is a hollow elastic rubber mold body having ribs before diameter expansion showing one example of the present invention.

FIG. 5 is a front view showing a state in which a spacer is attached to a hollow elastic rubber mold body having a rib whose diameter is expanded.

FIG. 6 is a front view showing a state in which a spacer is attached to a hollow elastic rubber mold body having ribs with an enlarged diameter.

[Explanation of symbols]

 1 Hollow elastic rubber molded body 2 Maximum outer shape of fitted body 3 Spacer 4 Rib

Claims (2)

[Claims] 1. A shape substantially the same as a body to be fitted, the outer diameter of which is partially different in the axial direction, the dimension in the direction perpendicular to the axis is smaller than the dimension of the body to be fitted, and the length in the axial direction is fitted. After molding a hollow elastic rubber molded tube body that is longer than the body length, expand the diameter over the entire length so that it can be attached to the maximum outer diameter part of the body to be fitted, and place a spacer in the expanded hollow part. Different diameter cold shrink tube characterized by being attached. 2. The hollow elastic rubber molded tube body is provided with ribs of an appropriate shape at the edge thereof.
Different temperature cold shrink tube described in.