JPS6322079Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention is a corrugated flat resin tube, that is, a resin tube whose upper and lower surfaces are flat in cross-section in the horizontal direction, semicircular at both ends, and whose outer shape is corrugated in the longitudinal cross-section. The present invention relates to a cutter for cutting pipe manufacturing, and relates to a cutter for cutting a corrugated resin pipe for inserting and protecting a pair of thermal fluid transport pipes such as hot water supply pipes.

Prior Art Conventionally, a pair of outer resin pipes 3 into which a thermal fluid conveying pipe (copper pipe) 1 such as a hot water supply pipe having a heat insulating coating 2 is inserted, as shown in FIG.
In order to expose the inner copper tube 1, use a commercially available cutter knife (commonly known as NT cutter) to cut the outer resin tube 3 vertically from the distal end surface at the joint of the pair of copper tubes 1. Next, the resin pipe 3 is peeled off by cutting it into rings in the horizontal direction, and then the heat insulating coating 2 of the exposed copper pipe 1 is scraped off in the vertical direction to expose the copper pipe 1.

This cutting method using a cutter knife is
It was simple manual work, inefficient, and unsafe work that could potentially injure the hands.

Recently, however, a new piping material for thermal fluid transfer pipes with excellent heat insulation properties has been developed. This piping material is as shown in A and B in FIG. 2
This pair is wrapped with aluminum foil laminated tape 5 and bound together, and this is inserted into an outer protection tube 6 made of a flat corrugated polystyrene tube. Note that a signal wire (electric wire) 7 may be inserted into the space between the joint portion of both heat shield tubes 4 and the aluminum foil laminated tape 5.

It is difficult to cut the outer protection pipe 6 in such a heat insulating piping material with a cutter knife as described above, and it is even more inefficient and unsafe. Furthermore, the internal heat shield tube 4, aluminum foil laminated tape 5, copper tube 1, etc. may be damaged.

Purpose This invention is intended for use in corrugated flat resin pipes that protect internal inserts, such as flat corrugated resin pipes that insert and protect thermal fluid conveying pipes, and preferably outer flat resin pipes in highly insulating piping materials such as those described above. The object is to provide a cutter that can easily, efficiently, and safely cut a corrugated protective tube without damaging the inserts inside.

Structure The gist of this invention is as described below.

In a cutter body having an approximately C shape, which is provided by connecting an opening that allows passage of a corrugated flat resin pipe in the long diameter direction and a space having a width that allows rotation of the resin pipe, the opening A cutter blade is provided with a groove that engages with the outer peak of the resin pipe on their inner surfaces forming the cavity, and a cutter blade is provided so that the cutting edge protrudes into the groove between the opening and the cavity. A cutter for corrugated flat resin pipes.

This idea will be explained in detail below.

FIG. 3 shows a specific example of the cutter according to the present invention, in which A is a front view and B is a side view. 8 is the cutter body, which is approximately C-shaped. The cutter body 8 has an opening 9 and a cavity 10 connected to the opening 9 inwardly. In the cutter main body 8, inner surfaces 11 and 12 forming the opening 9 and the cavity 10 are provided with grooves 13 that engage with the peaks of the corrugated flat resin pipe P to be cut. There are cutter blades 14, 15, 1 in the cutter body 8 facing the opening 9 and the groove 13 in the cavity 10.
6, 17, 18, and 19 are embedded in upper and lower pairs. The height between the tips of the upper and lower inner surfaces 11 of the opening 9 and the bottom surface of the concave groove is dimensioned to allow passage of the flat resin pipe P in the long diameter direction. The size of the space 10 is such that at least a part of the semicircular side surface of the end edge in the longitudinal direction of the resin pipe P is the space 10.
It is wide enough to be able to rotate while contacting the inner surface 12 of. The cutter blade 14...19
As shown in the figure, when the resin pipe P passes through in contact with the inner surfaces 11 and 12 of the opening 9 and the cavity 10 and rotates, the cutting edge T is formed at the trough of the resin pipe P. The cutter body 8 is embedded within the cutter body 8 to the extent that it does not protrude beyond the imagined inner surface S of the pipe to be cut.

Next, as a method of using the invented cutter shown in FIG. 3, a method for cutting the outer flat corrugated resin protection pipe 6 of the highly heat-insulating piping material shown in FIG. 2 will be described.

The procedure for cutting the outer protective tube 6 of such a heat insulating piping material to expose the internal copper tube 1 is as follows: cutting the protective tube 6 → cutting off the aluminum foil laminated tape wrapping 5 → cutting the heat shielding tube 4. It's summery. First, the peaks of the upper and lower flat surfaces at the cutting location of the protective tube 6 are aligned with the inner surface 11 of the opening 9 of the cutter body 8.
so as to pass through the opening along the groove 13 of
The cutter body 8 is pressed against the cut portion of the protective tube 6 at the opening 9, and the cut portion is forced through the opening 9. At this time, the push cutter blade 14,
The cutting edge T of No. 15 cuts into the ridges of the upper and lower flat surfaces of the resin tube 6, and the upper and lower flat surfaces of the protective tube 6 are cut at the ridges. Next, the semicircular side surfaces F and G at both ends of the protective tube 6 in the longer diameter direction that remain uncut are cut off.

Both the embedded cutter blades 18 and 19 of the cutter body 8 bite into the crest of the cut point on the front side F (semicircular side) of the protective tube 6 inserted into the cavity 10 through the opening 9. In this way, blank space 1
The cutter main body 8 is pressed against the cutting location of the semicircular side surface F of the protective tube 6 so that the front groove 13 provided with the cutters 18 and 19 of 0 is engaged with the peak of the side surface F. Next, in that state, cutter body 8
is rotated repeatedly at an angle of approximately 45° around the axis of the protective tube 6 (in the X and Y directions in the figure). As a result, the front semicircular side surface F of the protection tube 6 is cut at its peak.

Following that, the rear semicircular side surface G of the protection tube 6
In order to cut the protective tube 6 in the cavity 10, the cutter blade 16 cuts into the upper end of the semicircular side surface G of either the upper or lower flat surface, for example, the upper flat surface. Then, press the cutter body 8 downward, rotate the cutter body 8 by 45 degrees in the X direction, and use the cutter blade 16 to cut the upper half of the semicircular side face G at its peak.

Next, press the cutter body 8 upward against the lower flat surface of the protection tube 6 so that the cutter blade 17 cuts into the lower end of the semicircular side surface G, and rotate it 45 degrees in the Y direction. The lower half of the semicircular side surface G left uncut by is cut at the crest.

By the above operating method, the protective tube 6 is completely cut, and the embedded cutter blade does not damage the internal aluminum foil laminated tape 5, signal line 7, heat shield tube 4, copper tube 1, etc.

Note that the cutter blade embedded in the opening 9 of the cutter body 8 is located on the opposing inner surfaces 11 and 12 of the opening 9.
They are provided in pairs on the top and bottom, but they may be provided on only one side if necessary. In this case, although the number of operations of the cutter body 8 increases, it is possible to cut the flat surface of the protection tube. Further, in the cutter main body 8 shown in FIG. The shape is a perfect circle, and one embedded cutter blade is placed on one side of the empty space.
Even in individual pieces, most can be cut by increasing the rotation angle of the cutter body 8.

Furthermore, if necessary, as shown in FIG. 3, an inner resin pipe inserted into the corrugated flat pipe, for example, a corrugated round shape of the above-mentioned heat insulating piping material, is inserted into the opposite end of the opening 9 of the cutter body 8. With respect to the heat shield tube 4. An insertion hole 20 is provided. A groove 1 that engages with the peak of the heat shield tube 4 on the inner surface 21 of the insertion hole 20
3' is provided, and the cutter blades 22, 23 are embedded in the cutter body 8 forming this groove 13' to the extent that their cutting edges do not protrude into the inner surface formed by the troughs of the heat shielding tube 4. By providing such an insertion hole 20 for the heat shield tube 4 provided with a cutter blade,
Push the cutter body 8 into the cutting part of the heat shield tube 4 so that the heat shield tube 4 is inserted into the insertion hole 20, and turn the cutter body 8 half a turn around the axis of the heat shield tube 4 to remove the heat shield tube 4. Copper tube 1 inside
Cut without damaging.

Furthermore, if a groove 25 for storing the folding knife 24 is provided in the upper part of the cutter body 8 as shown in the figure, and this knife 24 is built into the cutter body,
This folding knife 24 is convenient in that it can be pulled out from inside the cutter body 8 and used when cutting the aluminum foil laminated tape 5 or the like in the heat insulating piping material. 26 is a retaining pin for the folding knife.

Effects As explained above, according to the cutter of this invention, the entire circumferential surface of a corrugated flat resin pipe can be cut completely, reliably, efficiently, and safely at the peak position. . Moreover, cutting does not cause any damage to the inserted item inside.

The cutter of this invention is suitable for cutting the outer protective pipe of insulated piping materials as shown in Figure 2, but it can also be used for cutting other general flat or round corrugated resin pipes. Can be fully applied.

[Brief explanation of the drawing]

Figure 1 shows a conventional heat-insulating piping material, where A is a cross-sectional view, B is a perspective view of the piping material with the outer resin tube removed, and Figure 2 is a newly developed high-temperature piping material. A shows a cross-sectional view of the heat-insulating piping material, B shows an enlarged side sectional view, and FIG. Figure B is a side view. 1... Copper pipe, 2... Heat insulation coating, 3... Outer resin pipe, 4... Corrugated polyethylene heat shielding pipe, 5...
... Aluminum foil laminated tape, 6 ... Corrugated flat polyethylene protective tube, 7 ... Signal line, 8 ... Cutter body, 9 ... Opening, 10 ... Blank space, 11, 1
2...Inner surface, 13, 13'...Concave groove, 14-2
3...embedded cutter blade, 24...groove, 25...
Folding knife, 26...stop pin.

Claims (1)

[Scope of utility model registration request] In a cutter body having an approximately C shape, which is provided by connecting an opening that allows passage of a corrugated flat resin pipe in the long diameter direction and a space having a width that allows rotation of the resin pipe, the opening and a groove that engages with the outer peak of the resin pipe on their inner surfaces forming the cavity, and a cutter with a cutting edge protruding into the opening and the groove of the cavity. A cutter for corrugated flat resin pipes featuring a blade.