JPS6029300Y2 - Sleeve for connecting plastic tubular bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a plastic sleeve suitable for connecting plastic tubular bodies such as electric cables or plastic pipes with plastic sheaths.

As a conventional method for connecting plastic tubular bodies, such as plastic sheathed cables, the method shown in FIG. 1 is known.

This method involves fitting a heat-shrinkable plastic sleeve 4 to the connection part 3 of the plastic sheathed cables 1 and 2, and then heating both ends of the plastic sleeve 4 with a torch lamp or resistance heater to shrink the part. The plastic sheathed cable 1.2 is brought into close contact with the plastic sheathed cable 1.2.

By the way, the plastic sleeve 4 shown in FIG. 1 has a length corresponding to the length of the connecting part 3, so if the connecting part 3 is long, the length and the connecting part correspond to the length. A sleeve 4 having an inner diameter larger than the outer diameter of the sleeve 3 is required, and in many cases it is difficult to integrally mold the sleeve 4.
Measures such as fusing the laminated layers were used.

By the way, the width of the tape to be wrapped around the mandrel has dimensional limitations due to manufacturing or winding operations, so the length of the above-mentioned connecting portion 3 may be longer than the tape width, or both ends of the sleeve 4 may be shortened to reduce costs. When applying heat-shrinkable properties to the tape, it is necessary to apply the tape in the width direction, and the connecting part is double-layered and thick, which may pose an obstacle to the wrapping process. Ta.

This invention attempts to solve these problems by connecting the tape by interlocking the concave and convex portions of the tape, such as a comb-like shape or a corrugated shape, so that the thickness of the tape-connected part is almost the same as that of other parts. Another purpose is to improve workability by preventing displacement in the circumferential direction of the sleeve when processing the sleeve.

Hereinafter, this invention will be explained in detail with reference to embodiments shown in FIGS. 2 to 4.

Figures 2 and 3 show a first embodiment of this invention, in which reference numeral 11 indicates a plastic sheathed cable, and reference numeral 13 indicates a connection portion with another plastic sheathed cable (not shown). .

Further, the reference numeral 14 in the figure is a sleeve of this invention, and this sleeve 14 is formed by wrapping a plastic tape, which will be described later, into a hollow cylindrical shape, and is attached to both ends of a plastic pipe 15 constituting the central portion in the length direction. A heat-shrinkable pipe 16 formed by winding a heat-shrinkable plastic tape (described later) into a hollow cylindrical shape is connected thereto.

That is, as shown in FIG. 3, both ends of a plastic tape 17 (which may be heat-shrinkable) whose width is the length direction of the sleeve 14 are formed into a comb-like shape, and both sides of this plastic tape 17 are formed into a comb-like shape. One end of the heat-shrinkable plastic tape 18 facing the end is similarly formed into a comb tooth shape, and these convex portions A and concave portions B are engaged with each other, so that both tapes 17 and 18 are The sleeve 14 is made into a single sheet having the same thickness, and is wound around a metal core and heated to form the sleeve 14.

The operation of the sleeve 14 configured in this way will be explained below.

As shown by the solid line in FIG. 2, when the sleeve 14 is fitted to the connection part 13 of the plastic sheathed cable 11, etc., and the heat-shrinkable pipe 16 near the connection part 13 is heated so that both ends receive more heat, The heated portion thermally shrinks in the radial direction, and its inner and outer diameters are reduced as shown by the chain lines in FIG.

By the way, when performing these heat shrinking processes, the heat shrinkable pipe 1 connected to both ends of the plastic pipe 15
6, and if heat shrinkage is performed excluding the right end of this heat-shrinkable pipe 16 in FIG.
As shown in the figure, the central portion of the sleeve 14 (the ends of the plastic pipe 15 and the heat-shrinkable pipe 16 near both ends thereof) is not heated, and the convex portion A shown in FIG.
Also, force in the circumferential direction of the sleeve 14 during contraction is hardly applied to the concave portion B, and even if force is applied, the convex portion A and the four portions B are engaged with each other, and both tapes 17.
There is no possibility of displacement in the circumferential direction of the sleeve 14 between the sleeves 18 and 18.

Also, if the thickness of both tapes 17 and 18 is the same size,
The thickness of the sleeve 14 including the convex portion A and the concave portion B is uniform.

In addition, if the interlocking relationship between the uneven portions of the heat-shrinkable plastic tape 18 and the uneven portions of the plastic tape 17 is shifted by 172 pitches for each layer so that the protrusions of the tape 18 and the protrusions of the tape 17 alternately overlap, the result will be even better. The pipe 15 and the pipe 16 are reliably fused together.

On the other hand, FIG. 4 shows a second embodiment of this invention, in which the ends of both tapes 17 and 18 are engaged with a partially bulged convex portion C and a partially narrowed concave portion. Connect and tape both sides on one side of these points17.18
A relatively thinner adhesive tape 19 is attached.

In this second embodiment, both the tapes 17 and 18 are prevented from shifting in the circumferential and longitudinal directions of the sleeve 14, and also the tapes 17 and 18 are prevented from shifting in the thickness direction. This improves the workability during forming.

Further, the increase in thickness due to the application of the adhesive tape 19 can be kept to a negligible level.

As detailed above, in this invention, when connecting the tape in the length direction of the sleeve, uneven parts are formed at each end and are interlocked, so when the tape is wound to form the sleeve. Alternatively, when heat-shrinking the sleeve, it is possible to prevent discrepancies in the circumferential direction between the tapes, increasing workability, and reducing the increase in the thickness of a part of the sleeve. There are effects such as being able to obtain sleeves.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of connection using a conventional connection sleeve, Fig. 2 is a longitudinal sectional view of main parts showing the first embodiment of this invention, and Fig. 3 explains the tape shown in Fig. 2. Developed view, 4th
The figure is a developed view of a tape showing a second embodiment of this invention. 14...Sleeve, 15...Plastic pipe, 16
・・Heat shrinkable pipe, 17・・Plastic tape, 1
8. Heat-shrinkable plastic tape, A, C.. Convex portion, B, D.. Concave portion.

Claims (1)

[Scope of utility model registration request] Ends of a heat-shrinkable pipe formed by winding a heat-shrinkable plastic tape are connected to both ends of a plastic pipe formed by winding a plastic tape into a hollow cylindrical shape; A sleeve for connecting a plastic tubular body, characterized in that a plastic tape and a heat-shrinkable plastic tape are each formed with uneven parts at their ends and are engaged with each other.