JP3869280B2 - Clad cutting removal tool at the end of the cladding tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating cutting / removing tool used for cutting and removing a coating on an end portion of a cladding tube in which a coating such as a heat insulating material is applied to the outside of a pipe body, such as a water supply hot water supply pipe for a house, for example. It is about.
[0002]
[Prior art]
For example, there are water supply and hot water supply pipes for homes in a structure in which a coating made of foamed plastic or the like is applied to the outside of a resin pipe main body for heat insulation. When connecting the end of such a cladding tube to a pipe joint, it is necessary to remove the coating on the end of the cladding tube to expose the tube body for a predetermined length.
[0003]
Conventionally, the operation of cutting and removing the coating at the end of the cladding tube has been performed as follows. First, the length for removing the coating (the length from the tube end) is measured, and a mark is placed at the position where the coating is cut. Next, the coating is cut in the circumferential direction at the mark position by using a sharp blade such as a cutter or scissors or a tool for cutting the coating in the circumferential direction. Thereafter, the cut coating is pulled out of the tube body.
[0004]
[Problems to be solved by the invention]
However, the cladding cutting and removal operation at the end of the cladding tube is often performed in a narrow place in a state where piping is already completed and the cladding tube end cannot be moved freely. There is a problem like this.
(1) It is difficult to cut the coating without bringing the blade of the cutting tool into contact with the pipe body due to uneven thickness of the coating and the force of the cutting tool. The surface of the main body is often damaged. If the surface of the pipe body is deeply damaged, water tightness when connected to a pipe joint, durability of the pipe body, and the like are impaired.
(2) It is difficult to measure the cutting position and mark the surface of the coating in the circumferential direction. (3) The end face of the pipe body and the end face of the coating may be misaligned, making it difficult to measure the cutting position.
(4) When using a tool that cuts the coating in the circumferential direction, it is difficult to confirm the cutting even if the cutting can be moved, and it is troublesome to remove the coating after cutting.
(5) When a cutter or scissors is used, it is difficult to cut the coating perpendicular to the axis, and the finish of the cut end surface of the coating is not good.
[0005]
An object of the present invention is to provide a coating cutting / removing tool for a cladding tube end portion which has solved the above-described problems.
[0006]
[Means for Solving the Problems]
The covering cutting / removing tool at the end of the cladding tube according to the present invention has a protective cylinder whose front end is inserted between the tube main body of the cladding tube and the coating, and the rear end side of the protective cylinder is centered on the same axis as the protective cylinder. A rotating member that is rotatably attached so as not to move in the axial direction, a supporting member that is attached to the rotating member so that a tip part can approach and separate from the tip side of the protective cylinder, and a tip part of the supporting member A cutting blade attached to the support member, and the cutting blade is fixed to a support member with a cutting edge facing the surface of the protection tube and a blade facing the circumferential direction of the protection tube, and the support member is an elastic member By the repulsive force, the cutting blade is urged in the direction of pressing the cutting edge against the surface of the protective cylinder .
[0007]
This coated cutting / removing tool is used as follows. With the distal end portion of the support member separated from the distal end portion of the protective cylinder, the distal end side of the protective cylinder is inserted between the tube body of the cladding tube and the coating. Then, the front-end | tip part of a supporting member is made to approach the front-end | tip part of a protection cylinder, and a cutting blade is made to bite into a coating | cover until a blade edge | tip reaches the surface of a protection cylinder. In this state, the rotating member is rotated to cut the coating in the circumferential direction. Since this cutting is performed on the protective cylinder, the pipe body is not damaged. After cutting, the coated cutting / removing tool is pulled out. Since the cut | disconnected coating | cover is fitted in the outer side of the protection cylinder, it can be easily extracted from a pipe | tube main body with a protection cylinder.
[0008]
In the coated cutting / removing tool of the present invention, it is preferable that a stopper in which the end face of the tube main body abuts is provided in the protective cylinder, and the distance between the stopper and the cutting blade is set to a length for removing the coating.
If such a stopper is provided, the coating can be cut and removed by a predetermined length easily and accurately without measuring the length from the end face of the tube body to the cutting position of the coating.
[0009]
Coated cutting removal tool of the present invention, the support member, by the repulsive force of the elastic member, that is urged in a direction of pressing the cutting edge of the cutting blade on the surface of the protective tube.
When biased in this way, the support member always tries to return to the direction in which the cutting blade bites into the coating, so that the operation of the coating cutting / removing tool becomes easy and the covering cutting / removing tool is pulled out after the cutting of the coating. Sometimes, the cut coating can be prevented from falling off the protective cylinder by the cutting blade, and the coating can be removed more reliably.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0011]
Embodiment 1 FIG. 1 shows an embodiment of the present invention. The coating cutting / removing tool 10 removes the coating 16 by a predetermined length at the end of the coating tube 12 as shown in FIG. 2, that is, the coating tube 12 having the tube main body 14 coated with foamed plastic or the like. It is intended for use.
[0012]
The coating cutting / removing tool 10 includes a protective cylinder 18 whose distal end is inserted between the tube main body 14 of the cladding tube 12 and the coating 16. The protective cylinder 18 is required to be as thin as possible and difficult to deform in order to facilitate insertion between the tube body 14 and the coating 16. For this reason, it is preferable to use a metal tube such as a stainless steel tube as the protective cylinder 18, but it is also possible to use a hard plastic tube or the like.
[0013]
A cylindrical rotating member 20 is attached to the rear end side of the protective cylinder 18 so as to be rotatable about the protective cylinder 18 as an axis. In addition, two fixing rings 22A and 22B are attached to the protective cylinder 18 in order to prevent the rotating member 20 from moving in the axial direction. In this example, one fixing ring 22B is in the form of a cap that seals the rear end of the protective cylinder 18.
[0014]
The rotating member 20 is integrally formed with a pair of support pieces 24A and 24B in parallel with a plane passing through the axis. A support member 26 is supported between the support pieces 24A and 24B so as to be rotatable about the shaft pin 28. The support member 26 has a rod shape, and extends from the portion supported by the shaft pin 28 to the distal end side of the protective cylinder 18. The distal end portion of the support member 26 can be moved closer to and away from the distal end portion of the protective cylinder 18 as the support member 26 reciprocates around the shaft pin 28.
[0015]
A cutting blade 30 is fixed to the tip of the support member 26. The cutting blade 30 is fixed to the support member 26 with the cutting edge facing the surface of the protective cylinder 18 and the blade facing the circumferential direction of the protective cylinder 18. Further, an elastic member 32 is attached in a compressed state between the rear end portion of the support member 26 (the rear end side with respect to the shaft pin 28) and the rotating member 20. Due to the repulsive force of the elastic member 32, the support member 26 always receives a rotational force that is biased in a direction in which the cutting blade 30 is pressed against the surface of the protective cylinder 18. As the elastic member 32, it is preferable to use a metal coil spring or leaf spring, but it is also possible to use rubber.
[0016]
A stopper 34 is fixed inside the protective cylinder 18. When the protective cylinder 18 is inserted between the tube main body 14 and the coating 16, the stopper 34 abuts against the end surface of the pipe main body 14 so that the protective cylinder 18 cannot be inserted any further (the insertion amount of the protective cylinder 18 is reduced). To regulate). The distance L between the distal end surface of the stopper 34 and the cutting blade 30 is set to a length at which the coating 16 should be removed.
[0017]
Next, the usage method of the covering cutting removal tool 10 comprised as mentioned above is demonstrated with reference to FIG. First, as shown in (A), the state in which the tip of the support member 26 is separated from the tip of the protective cylinder 18 by pushing the rear end of the support member 26 (the cutting blade 30 is pulled away from the protective cylinder 18). Then, the front end side of the protective cylinder 18 is inserted between the tube main body 14 and the coating 16 from the end surface of the cladding tube 12. This insertion is performed until the end surface of the tube body 14 hits the stopper 34 (see FIG. 1D) in the protective cylinder 18.
[0018]
After that, when the rear end portion of the support member 26 is released, the support member 26 returns to the original position by the force of the elastic member 32 as shown in (B). Next, the front end portion of the support member 26 is pushed and cut. The blade 30 is bitten into the coating 16 until the blade tip reaches the surface of the protective cylinder 18. In this state, as shown in (C), the rotating member 20 is rotated one or more times to cut the coating 16 in the circumferential direction. Since this cutting is performed on the protective cylinder 18, the pipe body 14 is not damaged. After cutting, when the coated cutting / removing tool 10 is pulled out as shown in (D), the cut coating 16a is fitted to the outside of the protective cylinder 18, so that it can be easily pulled out from the tube body 14 together with the protective cylinder 18. it can. Since the cutting blade 30 is pressed against the protective cylinder 18 by the force of the elastic member 32, the removed coating 16a can be reliably recovered without the removed coating 16a falling off the protective cylinder 18.
[0019]
For example, in the case of a coated pipe (water supply hot water pipe) coated with foamed plastic on a plastic pipe body with an inner diameter of 13 mm and an outer diameter of 17 mm, the exposed length of the pipe body necessary to connect to the pipe joint (Length to remove the coating) is 3 cm. Therefore, the distance L between the stopper 34 and the cutting blade 30 is set to 3 cm. In this case, the protective cylinder 18 may be a stainless steel tube having an inner diameter of 17.5 mm, an outer diameter of 19 mm, and a wall thickness of 0.75 mm.
[0020]
Embodiment 2 FIG. 4 shows another embodiment of the present invention. The covering cutting / removing tool 10 is obtained by attaching a slider 36 to the tip of a support member 26 and fixing a cutting blade 30 to the slider 36. The slider 36 can be fixed at an arbitrary position in the longitudinal direction of the support member 26 by a fastening tool 38. The support member 26 is provided with a scale 40 indicating the distance from the stopper 34 (see FIG. 1D) to the cutting blade 30. The configuration other than the above is the same as that of the first embodiment. With such a configuration, the length of the coating to be removed can be changed as necessary.
[0021]
【The invention's effect】
As described above, according to the present invention, the protective cylinder is inserted between the pipe body at the end of the cladding tube and the coating, and the coating is cut on the protective cylinder. The coating can be easily cut and removed without wearing. In addition, the cut end face of the coating can be finished cleanly. Further, by providing a stopper, the coating can be accurately cut and removed by a predetermined length without measuring the cutting position of the coating.
[Brief description of the drawings]
1A and 1B show an embodiment of a coated cutting and removing tool according to the present invention, in which FIG. 1A is a side view, FIG. 1B is a front view, FIG. 1C is a plan view, and FIG.
FIG. 2 is a cross-sectional view of a cladding tube.
FIGS. 3A to 3D are side views showing a process of cutting and removing the coating at the end of the cladding tube with the coating cutting and removing tool of FIG. 1;
FIG. 4 is a side view of an essential part showing another embodiment of a coating cutting / removing tool according to the present invention.
[Explanation of symbols]
10: Cover cutting removal tool
12: cladding tube
14: Tube body
16: Covering
18: Protection cylinder
20: Rotating member
22A: 22B: fixing ring
26: Support member
30: Cutting blade
32: Elastic member
34: Stopper

Claims (2)

A protective tube (18) whose front end is inserted between the tube body (14) and the cover (16) of the coated tube (12), and the same axis as the protective tube (18) at the rear end of this protective tube (18) A rotating member (20) mounted so as to be rotatable about the axis and not to move in the axial direction, and attached to the rotating member (20) so that the distal end portion can approach and separate from the distal end side of the protective cylinder (18) And a cutting blade (30) attached to the tip of the support member (26) ,
The cutting blade (30) is fixed to the support member (26) toward the circumferential direction of and the blade protecting tube towards the surface of the protective tube a cutting edge (18) (18),
The support member ( 26 ) is biased in a direction to press the cutting edge of the cutting blade ( 30 ) against the surface of the protective cylinder ( 18 ) by the repulsive force of the elastic member ( 32 ) .
A covering cutting / removing tool at the end of the covering tube.   The covering cutting and removing tool according to claim 1, wherein a stopper (34) against which an end surface of the pipe body (14) abuts is provided in the protective cylinder (18), and the stopper (34) and the cutting blade (30) A coating cutting / removing tool for the end of a cladding tube, characterized in that the interval (L) is set to a length for removing the coating (16).

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