JPS6122426Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-shrinking tool for a cable connection portion, which is used to heat-shrink a heat-shrinkable tube covering the cable connection portion.

As shown in FIGS. 1 and 2, a conventional heat-shrinking tool 3 used to heat-shrink a heat-shrinkable tube 2 made of cross-linked polyethylene or the like placed over the outer periphery of a cable connection portion 1 is used to heat-shrink the heat-shrinkable tube 2. It has a heating cylinder 4 that accommodates a cable connection part 1,
The heating cylinder 4 is divided into upper and lower halves with a dividing surface 5 located approximately at the center in the vertical direction as a border, so that the cable connecting portion 1 can be easily inserted and removed. The cables 6 on both sides of the cable connection portion 1 are supported by supports 7, and thereby the cable connection portion 1 is positioned within the heating cylinder 4 in the vertical and horizontal directions.
The heating cylinder 4 has a built-in electric heater such as a heating wire for heating.

By the way, in such a heat shrink tool 3, since the diameter of the cable 6 is smaller than the diameter of the cable connection part 1, the heat shrink tube 2 first comes into close contact with the outer periphery of the cable connection part 1, which has a large diameter, and then It will come into close contact with the outer circumference of the cable 6, which has a small diameter,
Therefore, even though the heat-shrinkable tube portion on the outer periphery of the cable connecting portion 1 is in close contact with the outer periphery of the cable connecting portion 1, it continues to be heated for shrinkage. Since the heat-shrinkable tube 2 is originally designed to be able to shrink to the outer periphery of the cable 6, the force (stress) of the heat-shrinkable tube 2 that tends to shrink is generated in the central part.
In addition, as heating continues, the temperature of the heat-shrinkable tube 2 rises in the center, and in this state, the shrinkage stress of the heat-shrinkable tube 2 exceeds the tensile strength of the heat-shrinkable tube material. If it turns (because it is a plastic material, the tensile strength will decrease as the temperature rises), the heat shrink tube 2 will be cut.

For this reason, in the conventional heat shrink tool 3, when the heat shrink tube 2 has finished shrinking in the center and is in close contact with the outer periphery of the cable connection part 1, the heat shrink tool 3 or the cable connection part 1 is moved from side to side. The heat-shrinkable tube 2 is not heated at its center, but at both sides thereof to be compressed and brought into close contact with the outer periphery of the cable 6.

However, this method has the disadvantage that the heat shrink tool 3 or the cable connection part 1 must be moved, resulting in poor workability.

An object of the present invention is to provide a heat-shrinking tool for cable connections that can perform optimal heating without moving the heat-shrinking tool or the like.

The heat-shrinking tool for cable connections of the present invention mechanically divides the heating cylinder into upper and lower halves, and also divides at least the upper cylinder part in the longitudinal direction into a divided part facing the cable connection part and divided parts opposite to the cable on both sides thereof. The heating cylinder should be divided into at least three parts, and the upper part of these parts should be able to be opened and closed, and the heating cylinder should be electrically divided according to the mechanical division in the longitudinal direction, so that it could be heated independently. This makes it possible to heat only both ends of the heat shrink tube independently.

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 3 and 4, the heat-shrinking tool 3 for cable connections of this embodiment has a heating cylinder 4, and this heating cylinder 4 has a dividing surface 5 at approximately the center in the vertical direction. It is mechanically divided into two into an upper cylinder part 4A and a lower cylinder part 4B, and these upper and lower cylinder parts 4A and 4B are separated by two dividing surfaces 8 and 9 separated by a distance in the longitudinal direction. It is mechanically divided into three parts in the longitudinal direction as well: the cable connection part opposing divided parts 4A ₂ and 4B ₂ and the cable facing divided parts 4A ₁ , 4B ₁ , 4A ₃ , and 4B ₃ on both sides thereof. Each divided part 4A ₁ , 4
Heaters 10A ₁ , 10B ₁ and 10A 2 , 10B ₂ and 10A ₃ , and 10B ₃ are independently built into B ₁ and 4A ₂ , 4B ₂ and _{4A 3} , and 4B ₃ . In other respects, the structure is similar to that of FIG. 1.

Such a heat shrink tool 3 initially cuts all the divided parts 4A ₁ , 4B ₁ , 4A ₂ , 4B ₂ and 4A ₃ , 4B ₃
Each built-in heater 10A ₁ , 10B ₁ and 10A ₂ , 1
0B ₂ , 10A ₃ , and 10B ₃ are energized to heat and shrink the heat-shrinkable tube 2. When the heat shrink tube 2 is tightly attached to the cable connection part 1, the heaters 10A 2 , ₁ built in the central divided parts 4A ₂ , 4B ₂
The energization to 0B ₂ is stopped, and the central upper divided portion 4A ₂ is opened to quickly cool the heat-shrinkable tube portion on the outer periphery of the cable connection portion 1. At this time, the divided parts on both sides 4A ₁ , 4B ₁ , 4A ₃ , 4B ₃
The heaters 4A ₁ , 4B ₁ , 4A ₃ , and 4B ₃ built in are continued to be energized to continue heating both ends of the heat-shrinkable tube 2 so as to bring it into close contact with the outer periphery of the cable 6 . When both ends of the heat-shrinkable tube 2 are in close contact with the cable 6, the current supply is completely stopped, the upper divided portions 4A ₁ and 4A ₃ on both sides are opened, and the cable connection portion 1 is taken out.

Note that the lower cylindrical body portion 4B may not be divided mechanically but only electrically.

In addition, if the heating cylinder 4 is long,
It may be divided more than the number of divisions.

Furthermore, each of the upper divided parts 4A ₁ to 4A ₃ has one end pivoted to the lower cylindrical body part 4B by a hinge 11 so as to be freely openable and closable, and a handle 12 is attached to the other end so that it can be opened and closed easily. It is preferable to do so.

As explained above, in the heat-shrinking tool for cable connection parts according to the present invention, it is possible to heat only both ends of the heat-shrinkable tube independently from the central part, so that the heat-shrinkable tube can be heated easily due to overheating of the central part. damage can be prevented. Further, according to the present invention, it is possible to independently and sufficiently heat both ends of the heat shrink tube to shrink the cable into a cable having a smaller diameter than the cable connection portion. Further, according to the present invention, there is no need to move the heat shrinking tool or the cable connection side, which saves labor and allows optimal heating to be performed.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a side view of a conventional heat-shrinkable tool, and FIGS. 3 and 4 are a longitudinal sectional view and a side view of an embodiment of a heat-shrinkable tool according to the present invention. . 1...Cable connection part, 2...Heat shrink tube, 4...Heating cylinder, 4A...Upper cylinder part, 4B
...Lower cylinder part, 4A ₁ , 4B ₁ , 4A ₃ , 4B ₃ ...
Cable opposing split portion, 4A ₂ , 4B ₃ ... Cable connection opposing split portion, 4B ₁ to 4B ₃ ... Lower split portion, 6... Cable, 10A ₁ to 10A ₃ and 10B ₁ to 10B ₃ ... Electricity heater.

Claims (1)

[Scope of utility model registration request] A cable connection part and a heat-shrinkable tube fitted around the outer circumference thereof are accommodated in a heating cylinder which has a built-in electric heater and is mechanically divided into two upper and lower parts into an upper cylinder part and a lower cylinder part, In the heat-shrinking tool for a cable connection part, which heats the heat-shrinkable tube with the heating cylindrical body and is brought into close contact with the outer periphery of the cable connection part and the cable connected thereto, the upper cylindrical body part also has the heat-shrinkable tube in the longitudinal direction. A cable connection part facing divided part,
The heating cylinder is divided into at least three parts, each of which can be opened and closed freely, and the heating cylinder is electrically divided and becomes independent according to the mechanical division in the longitudinal direction. A heat-shrinking tool for cable connection parts, which is characterized in that it can be energized by energizing.