JPH0243704Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background of the Invention] The present invention relates to a heat-shrinkable tube, particularly a heat-shrinkable tube used for covering various pipes, cables, and the like.

Heat-shrinkable tubes made of rubber, plastic, etc. are easy to install and have excellent waterproof properties, so they are widely used for covering pipes, repairing or connecting cables, etc.

By the way, conventional heat-shrinkable tubes are
Generally, the outside diameter is small and the wall thickness is relatively thin, less than 2 mm, so it can be easily cut to the desired length with scissors, knives, cutters, etc., and at almost right angles to the axial direction. Ta. Additionally, specialized cutting machines have also been developed.

However, recently, depending on the application, heat-shrinkable tubes that have a large diameter, a wall thickness of 2 mm or more, and are made of hard plastic have come to be used, making it difficult to cut them. In particular, since only hand tools can be used in field work, it is difficult to cut the tube at right angles and with a clean cut surface.

[Purpose of the invention] The first purpose of the present invention is to provide a heat-shrinkable tube that can be easily cut, especially in field work, etc., and the second purpose is to provide a heat-shrinkable tube that can be cut easily even in dark workplaces such as manholes and basements. To provide a heat-shrinkable tube whose parts can be easily checked and which can prevent impurities, dirt, etc. from entering into notches or recesses.

[Summary of the invention] The gist of the invention is that cuts or recesses extending over the circumference are provided at arbitrary intervals on the outer periphery of a heat-shrinkable tube, and furthermore, the cuts or recesses are filled with a colored putty-like material.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the heat-shrinkable tube of the present invention.

As shown in the figure, cuts or recesses 2 are provided on the outer periphery of a heat-shrinkable tube 1 at arbitrary intervals so as to be perpendicular to the length direction of the tube.

The depth of the recess 2 is arbitrary as long as it serves as a guide for cutting perpendicular to the circumferential direction, but it is preferable that it be shallow for a tube made of soft rubber and deep for a tube made of plastic. In addition, the recess 2
Even if the cutting edge of a knife or the like can be inserted within a very narrow area, the purpose can be achieved. The tip of the recess 2 is preferably rounded to prevent cracks from occurring.

For example, the following method is used to provide a cut or a recess in the heat-shrinkable tube 1.

One method is to expand the tube by creating a dent in the tube before expansion by mechanical cutting, electrical discharge machining, or a mold, and another method is to provide a protrusion on the outer mold of the tube during expansion. , the pressure at the time of expansion presses against the outer circumferential surface of the tube to form a depression.
The former is suitable for rubber tubes that are difficult to deform, and the latter is suitable for plastic tubes that are easy to deform.

Large-diameter, thick-walled heat-shrinkable tubes can be easily and accurately cut on-site using hand tools such as knives and scissors using these recesses as guides.

Further, the recess 2 is filled with, for example, a white silicone putty-like material 3. By doing this, the cut portion can be easily confirmed even in dark workplaces such as manholes and basements, and it is also possible to prevent impurities, dirt, etc. from entering the recess 2, and furthermore, it is possible to prevent the formation of voids on the inner surface of the recess 2. .

FIG. 2 shows an example of a short tube of a specific length as another embodiment of the present invention. In this case, a plurality of recesses 2 of the same size are provided at both ends, and both ends can be cut to match the length of the object to be coated. This method is suitable for covering pipe connections that are symmetrical in shape with the connection point at the center.

When the heat-shrinkable tube of this invention is made of plastic, there are letters on the inner surface of the outer mold when the tube is expanded.
If symbols and the like are formed, characters and symbols can be easily formed on the surface of the tube, and the material management and classification of the tube can be easily and reliably performed. Further, if desired, printing or the like may be applied to the surface of the tube.

[Effects of the invention] According to the invention, the recess provided around the tube serves as a guide during cutting, and the thickness of the tube in that area becomes thinner, so even large-diameter, thick-walled tubes can be cut with hand tools. Can be easily cut.

Also, if the recess is formed when the tube is expanded,
Since it restores its original shape when it shrinks, even if a dent remains in the tube when it is coated, it will be heated and shrunk after being coated, so there is no need to worry about the mechanical strength decreasing.

Furthermore, since the recess is filled with a colored putty-like material, the cut portion can be easily seen even in a dark workplace.

Furthermore, it is possible to prevent impurities, contaminants, etc. from entering the recessed portion, and furthermore, the formation of voids on the inner surface of the recessed portion can be suppressed, thereby providing excellent deterioration resistance and electrical characteristics.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing embodiments of the heat-shrinkable tube of the present invention, respectively. 1: tube, 2: dent, 3: colored putty-like material.

Claims (1)

[Scope of utility model registration request] 1. A heat-shrinkable tube, characterized in that cuts or recesses extending over the circumference are provided at arbitrary intervals on the outer periphery of the heat-shrinkable tube, and further, the cuts or recesses are filled with a colored putty-like material.