JP2003019373A - Insulated cladding cutting cutter - Google Patents

Abstract

(57) [Summary] [PROBLEMS] At the time of underfloor heating, the front end of a foamed synthetic resin heat insulating cladding covering the hot and cold water supply pipe is
Provided is a cutting cutter for a heat insulating cladding tube, which can smoothly and accurately cut and remove an internal hot water supply / discharge pipe without damaging the same. A pair of jaws (4, 5) are provided on both sides of a front portion of a cutter body (1), and opposing end surfaces of these jaws (4, 5) are formed on concave arc-shaped heat insulating cladding receiving end surfaces (7, 8). In addition, by protruding both side straight blades 9a, 9b formed in a V-shape from the jaws 4, 5 on both sides, the straight blades from the concave arc-shaped receiving end surfaces 7, 8 are formed. The protrusion width of 9a and 9b is gradually reduced from the center toward the front and rear ends, and the large-diameter heat-insulated cladding is enclosed by the large-projection width portion, and the small-diameter heat-insulation cladding by the small-projection width portion. It is configured to cut while slightly leaving the thickness on the peripheral surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for cutting hot water supply pipes and drainage water pipes for underfloor heating, or heat insulation coating pipes made of foamed synthetic resin in which pipes such as bath pipes and general water supply pipes are provided. It is about the cutter.

[0002]

2. Description of the Related Art Conventionally, for example, a hot water supply pipe and a hot water discharge pipe for underfloor heating are arranged in an aligned state and covered with a tubular film inside a heat insulation coating pipe made of a foamed synthetic resin. The end of the heat insulation coating pipe is cut and removed by a predetermined length to expose the end of the hot water supply / exhaust pipe, and the tubular film covering the hot water supply / exhaust pipe is peeled off. After that, the hot water supply / exhaust pipe is connected to the hot water supply / exhaust passage of the heating panel. At this time, there is no suitable cutter for cutting the heat-insulating cladding or the tubular film, and after the worker cuts the heat-insulating cladding in place using a cutter knife,
The cut insulation insulation pipe part of a certain length is cut and separated over the entire length to release the coating from the hot water supply / exhaust pipe, and then the tubular film covering the hot water supply / exhaust pipe is extended from its end. The current situation is that the hot water supply / exhaust pipe is exposed by cutting and peeling in the vertical direction.

[0003]

However, when the heat insulating cladding is cut from the outer peripheral surface toward the inner peripheral surface by the cutter knife, the cutting depth cannot be accurately determined, so that the blade of the cutter knife is inserted into the heat insulating cladding tube. There is a problem that the hot water supply / exhaust pipe or the signal line protruding and inserted into the heat insulation coating pipe is damaged, and if the pipe is connected as it is, the hot water supply and the hot water leak and the heating function is impaired. Such a problem may occur when the tubular film covering the hot and cold water supply pipe is cut and peeled off. Further, not only the hot and cold water supply pipe but also other pipes such as the water supply pipe are covered. It also occurs when the heat-insulating pipe is cut and peeled. Also,
The cutter knife has a problem in that the work of cutting the heat-insulating coated pipe in a sliced shape requires time and labor, and the work efficiency of the pipe is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat insulating coated pipe for covering a pipe such as a hot and cold hot water supply pipe and a hot water supply pipe. Can cut accurately and efficiently without causing cuts in pipes, etc., and easily peel off the film covering the pipes such as hot water supply / exhaust pipes without damaging the hot water supply / exhaust pipes. Another object of the present invention is to provide a cutting cutter for heat-insulated cladding that can be cut and peeled.

[0005]

In order to achieve the above object, the invention according to claim 1 is a cutting cutter for a heat insulation coating pipe made of foamed synthetic resin, which covers pipes such as hot and cold water supply pipes and water supply pipes. Therefore, the cutter body is integrally provided with a flattened plate-shaped enlarged head at the front end of the handle, and both sides of the front half of this enlarged head are bifurcated to form a jaw portion. A heat-insulating cladding tube is formed in a heat-insulating cladding tube receiving port that widens forward between the facing inner end surfaces of the jaws, and the facing inner-end surfaces of the both jaw portions that form the peripheral edge of the receiving port are concave arc-shaped. It is formed on the receiving end surface, and further, straight blades on both jaws are inclined outwardly from the rear end toward the front end in a V shape, and the front and rear ends intersect the concave arc-shaped receiving end surface. The width of the straight blade protruding from the concave arc-shaped receiving end surface is set to the center in the lengthwise direction of the straight blade. From the front to the front and rear ends, and the large and small diameter heat insulation coating pipes are configured to be cut by a blade portion with a large protruding width and a blade portion with a small protruding width, leaving a slight thickness on the inner peripheral surface side. ing.

According to a second aspect of the present invention, in the invention according to the first aspect, the cutter main body is formed by superposing two main body halves and integrally connecting the two main body halves together. A plate-shaped blade body integrally provided with a pair of straight blades inclined outward in a V-shape from the rear end side of the heat-insulating cladding receiving end surface toward the front ends of both sides between the opposing inner end surfaces. The structure is such that the receiving end face intervenes freely in the front-back direction.

Further, in the invention according to claim 3, in the jaw portions on both sides formed on the enlarged head, the front end portion of one jaw portion is projected forward from the front end of the straight blade on the jaw portion side. It is characterized in that the front end thereof is formed as a refraction end portion which is refracted inward.

Further, in the invention according to claim 4, in the portion forming the other jaw of the two main body halves, the jaw of one main body half is slightly forward from the front end of the straight blade. The front end of the straight blade is exposed by contacting the jaw of one of the body halves by projecting it and providing the jaw piece of the other body half on the rear side with respect to the front end of the straight blade. It is characterized in that the outer end surface of the jaw piece in one of the main body half pieces is formed into an inclined end surface that gradually becomes thinner toward the front end portion of the straight blade.

[0009]

When the heat insulation coating pipe is inserted into the cutter body such that the heat insulation coating pipe covering the pipes such as the hot and cold water supply pipes is oriented so that the heat insulation coating pipe receiving port of the cutter body is orthogonal to the portion to be cut, Since the opening width between the jaw parts on both sides of the cutter body that forms this receiving port is formed to be larger than the outer diameter of the heat insulation cladding tube, the outer peripheral surface of the portion to be cut of the heat insulation cladding tube is recessed on both jaws. Mutual Vs protruding from the arcuate receiving end surface
It abuts straight blades facing each other in the shape of a letter in a erected state. If the cutter body is pushed toward the center of the heat insulation cladding tube from this state, since the heat insulation cladding tube is made of foam synthetic resin, both sides of the peripheral wall of the heat insulation cladding tube facing both jaws are thickened by the straight blades. Direction, the outer edges of the heat insulating cladding tube contact with and are received by the concave arc-shaped receiving end surfaces, and no further cutting is performed, and the straight blade is cut into the heat insulating cladding tube. In the vicinity of the inner peripheral surface, the depth reaches a depth in which the thickness of the heat insulating cladding on the inner peripheral surface side is slightly left.

In the adiabatic cladding tube cut by the cutting cutter, the large-diameter adiabatic cladding tube has a wall wall thicker than that of the small-diameter adiabatic cladding tube, while the cutting cutter has a thermal insulation layer. The cladding pipe receiving end surface is formed in a concave arc shape, and the protruding width of the straight blade projecting from the concave arc receiving end surface is gradually increased from the center portion in the longitudinal direction toward the front and rear ends. It is formed to be narrow.

Therefore, when cutting a large-diameter heat-insulated cladding tube, both sides of the outer circumferential surface of the large-diameter heat-insulated cladding tube have a central portion in the lengthwise direction of the straight blades facing each other in a V shape, that is, When the small-diameter heat-insulating pipe is cut, the heat-insulating pipe having a concave arc shape is cut to the depth that slightly leaves the thickness on the inner peripheral surface side by the blade portion protruding most widely from the receiving end face of the heat-insulating pipe. Both sides of the outer peripheral surface of the pipe are cut to a depth with a slight thickness left on the inner peripheral surface side thereof by a blade portion having a narrow protruding width from the concave receiving end surface of the straight blade on both sides. In addition, the straight blade is moved in the front-rear direction to cut the protruding width from the receiving end surface of the concave arc shape in a state in which the thickness of the large and small diameter heat-insulating cladding pipe is slightly left on the inner peripheral surface side. It may be configured to be adjustable to obtain.

In this way, the straight blades on both sides are cut from both sides of the outer peripheral surface of the heat insulating cladding to a depth that leaves a slight thickness on the inner peripheral surface side, and then the handle of the cutter body is wrapped around the heat insulating cladding. When it is turned to, the predetermined portion of the heat insulation coating tube is cut by the straight blade over the entire circumference while leaving the inner circumferential surface side slightly thin.

After that, the front bending end of the jaw protruding forward from the front end of the one straight blade of the cutter body is inserted into a proper position in the cut portion of the heat insulation cladding tube,
While penetrating through the remaining thin portion on the inner peripheral side of the location, insert the bent end of the jaw into the inner peripheral surface of the heat insulating cladding and this heat insulating cladding with the straight blade directed in the length direction of the heat insulating cladding. When the cutter body is moved in the length direction of the heat insulation coating pipe toward the tip surface of the heat insulation coating pipe, the cut end surface of the heat insulation coating pipe is The straight blades facing each other at a right angle divide the entire length between the cut end surface and the front end surface of the heat insulating cladding tube.

When a worker inserts his / her fingertip between the divided facing surfaces and expands the facing surfaces in a direction in which the facing surfaces are separated from each other, the thin portion on the inner peripheral side remaining on the cut end surface of the heat insulating cladding tube is cut off. On the other hand, the heat-insulating coating pipe is expanded and removed from the pipe side covered with the heat-insulating coating pipe, and the ends of the pipes such as the hot and cold water supply pipes covered with the heat-insulating coating pipe are exposed. After that, the other jaw of the cutter body is opposed to the front end of the tubular film covering the pipe such as the hot and cold water supply pipe, and the cutter body is moved in the length direction of the pipe such as the hot and cold water supply pipe. The cylindrical film is divided by the other straight blade projecting from the jaw, and then peeled off.

At this time, the cutter main body is formed by combining two main body halves, and in the portion forming the other jaw, the jaw piece of one main body half piece is straight bladed. The front end of the straight blade to the inner surface of the jaw piece of one of the main body halves by projecting it slightly forward from the front end of the body and providing the jaw piece of the other body half piece on the rear side with respect to the front end of the straight blade. Since the outer end surface of the jaw piece in one of the main body half pieces is formed in contact with the exposed end surface, the outer end surface is gradually thinned toward the front end portion of the straight blade.
Insert the outer end face of the jaw into the V-shaped space formed between the opposing peripheral surfaces of the two aligned pipes such as the hot water supply pipe and the hot water discharge pipe, or press it on the tubular covering film. When applied, the straight blade is automatically positioned at the center of the V-shaped space in the width direction due to the inclined end surface of the jaw piece on one of the main body half pieces, and the straight blade is attached to the pipe such as the hot and cold water supply pipe. The tubular film can be reliably and smoothly divided in the length direction of a pipe such as a hot water supply / exhaust pipe without contact.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a concrete embodiment of the present invention will be described with reference to the drawings.
Is a cutter main body made of a flat metal plate material having a constant thickness, the rear end portion of which is formed on the handle portion 2, and an enlarged head portion 3 wider than the handle portion 2 is integrally formed on the front end of the handle portion 2. Further, the both sides of the front half of the enlarged head 3 are bifurcated to form the both side jaws 4 and 5, and the space between the opposing inner end surfaces of the both side jaws 4 and 5 is anterior. It is formed in the heat-insulating coating pipe receiving port 6 that widens toward. In addition,
The opening width of the receiving port 6 is formed wider than the outer diameter dimension of the heat insulation coating pipe A to be cut.

Further, the peripheral edge portion of the receiving port 6, that is, the opposing inner end surfaces of the both jaw portions 4 and 5 are respectively formed into concave arc-shaped heat insulating cladding receiving end surfaces 7 and 8 which are gently curved outward. The receiving end surfaces 7 and 8 that are formed continuously, that is, the rear end portion, are integrally continuous at the central portion of the rear end of the receiving opening 6 via the concave arc-shaped end surface 10. Also,
A long hole 11 that is long in the front-rear direction is formed in the center of the enlarged head 3 in the width direction.
Is provided so as to penetrate between the front and back surfaces of the enlarged head 3, and a screw member 12 is disposed in the elongated hole 11 so as to be movable back and forth.

The cutter body 1 is formed with a grip piece 2'for forming the grip 2, a jaw pieces 4 ', 5'for forming the both side jaws 4, 5 and an elongated hole 11. It is formed by stacking two main body half-pieces 1a, 1b having a constant thickness and an enlarged head piece 1'having a hole portion for overlapping and connecting several peripheral portions thereof integrally with a screw 13. A gap 14 is provided on the facing surface of the enlarged heads 1 ', 1'of both main body halves 1a, 1b, and the blade 9 is movably interposed in the gap 14 in the front-rear direction.

A pair of straight blades 9a, 9b are formed on both sides of the front part of the blade body 9 and are inclined outwardly from each other toward the front end from the rear end side in a V shape. Blades 9a, 9b
Are the concave arc-shaped receiving end surfaces 7, 8 of the both jaws 4, 5.
The front and rear end portions of the central portion in the thickness direction of the are projected so as to intersect with the front and rear end portions of the receiving end surfaces 7, 8. Therefore, the protruding widths of these straight blades 9a and 9b projecting from the concave arc-shaped receiving end surfaces 7 and 8 of the both side jaws 4 and 5 into the receiving opening 6 are the lengths of the straight blades 9a and 9b, respectively. It becomes the maximum in the central part in the direction, and the widths of the projections from the concave arc-shaped receiving end faces 7, 8 gradually become narrower toward the front and rear ends.

Further, the front end of one of the jaws 4 is projected forward from the front end of the straight blade 9a provided on this jaw, and the projecting front end is bent inward to bend it. It is formed on the portion 4a. In addition, in the two body halves 1a, 1b forming the cutter body 1, one of the jaw pieces 5 ', 5'forming the other jaw 5 by superimposing the one of the jaws 5', 5 ' The projecting straight blade 9b is made to project slightly forward, and the other jaw piece 5'is shortened so that its front end is positioned rearward from the front end of the straight blade 9b.

Therefore, the straight blade 9b provided on the other jaw 5 side is exposed to the outside while being in contact with the inner surface of the one jaw 5 '. Further, the outer end surface of the jaw piece 5'protruding from the straight blade 9b is formed as an inclined end surface 5a which gradually becomes thinner toward the front end portion of the straight blade 9b.

Further, a screw rod portion 12a of the screw member 12 is passed through the center of the rear end portion of the blade body 9, and a nut body 12b is screwed on the tip of the screw rod portion 12a which has passed through the screw rod portion 12a. A spring 15 is interposed in a compressed state between the head portion 12c of the screw rod portion 12a and the facing surface of the blade body 9 exposed in the slot 11, and the force of the spring 15 causes the nut body 12 to move.
The b is fitted in the elongated hole 11 and is received on the plate surface of the blade body 9 so as to be slidable back and forth.

When not in use, the screw member 12 is provided with a long hole.
By moving the blade body 9 rearward along 11 and retracting the straight blades 9a, 9b on both sides of the blade body 9 rearward from the concave arc-shaped receiving end surfaces 7, 8 of the both side jaws 4, 5. In this state, the head portion 12c of the screw rod portion 12a is pivotally operated in this state to fix the lower surface of the head portion 12c to the rear end surface of the slot 11 by pressure. Further, at the time of use, the fixing of the screw member 12 is released, and the screw member 12 is moved forward along the long hole 11 so that the straight blades 9a, 9b on both sides of the blade body 9 are removed.
Is projected forward from the concave arc-shaped receiving end surfaces 7 and 8 of the both side jaws 4 and 5, and is fixed in this state.
The straight blades 9a and 9b on both sides are formed in a V shape at an angle of 90 degrees.

Reference numerals 16 and 16 denote heat-insulating sheathed pipe support members fixed to the front and back surfaces of the cutter body 1. The upper and lower surfaces of the heat-insulating pipe supporting members 7 and 8 having the concave arc-shaped receiving end faces 7 and 8 are central. , 8 and the heat insulating cladding tube A are formed integrally so as to be flush with each other in the lengthwise direction of the heat insulating cladding tube A.

The heat insulation coating pipe A cut by the cutting cutter thus constructed is a pipe made of synthetic resin foam having an elliptical cross section, and as shown in FIG. 4 and FIG. A pipe (going pipe) B and a hot water supply pipe (return pipe) C are inserted in a state of being aligned with each other to cover these hot and cold water supply pipes B and C. The hot and cold water supply pipes B and C are covered with a cylindrical covering film D. The hot water supply / exhaust pipes B and C are inserted into the heat insulating coating pipe A with the direction of alignment being oriented in the major axis direction of the heat insulating coating pipe A.

Next, at the time of underfloor heating of this heat insulation coating pipe A, in order to connect the hot and cold water supply pipes B and C to the heating panel, a certain length portion from the tip thereof is cut by the above cutting cutter. First, by loosening the screw member 12 and pushing the blade body 9 forward, the both side straight blades 9a, 9b are projected from the concave arc-shaped heat insulating cladding tube receiving end surfaces 7, 8 of the both side jaws 4, 5. Then, after fixing the blade body 9 in this state, the receiving port 6 is directed toward the portion of the heat insulation coating pipe A to be cut, and as shown in FIG. 4 and FIG. When the cladding tube A is inserted, both sides of the outer peripheral surface of the portion to be cut of the heat insulation cladding tube A come into contact with and abut on the both side straight blades 9a and 9b which are formed in a V shape, and then the both side straight blades.
Cut into 9a and 9b.

At this time, in the case where the heat insulation coating pipe A has a small diameter, the straight blades 9a and 9b on both sides are located near the rear ends thereof, that is, in the concave arc-shaped blades having a small protruding width from the receiving end surfaces 7 and 8. If they have a large diameter, they come into contact with and come into contact with the central portions of the straight blades 9a, 9b on both sides having a wider protruding width from the receiving end faces 7, 8.

The thickness of the heat insulation coating pipe A is set to a predetermined thickness according to the large and small diameters of the heat insulation coating pipe, and the straight blades 9a, 9b from the receiving end faces 7, 8 of the concave arc shape are formed. The protruding width of the heat insulating coated pipe A is slightly smaller than its thickness. Therefore, by pushing the heat-insulating sheathed pipe A from the state of contacting and abutting the straight blades 9a, 9b toward the receiving end faces 7, 8 of the concave arc shape, the heat-insulating sheathed pipes by the both-side straight blades 9a, 9b. When A is cut from the outer peripheral surface toward the inner peripheral surface and both sides of the outer peripheral surface of the heat insulating coated pipe A are in contact with and received by the concave arc-shaped receiving end surfaces 7 and 8, both sides are The straight blades 9a and 9b do not reach the inside of the heat insulation coating pipe A, but are in a state of being cut from the inner peripheral surface of the heat insulation coating pipe A to a depth position where a slight thickness portion is left.

Both sides of the heat-insulating cladding A have straight blades 9 on both sides.
When it is cut by a and 9b to the vicinity of its inner peripheral surface and is received by the receiving end surfaces 7 and 8 as described above, the heat insulating coated pipe A is longitudinally moved from the receiving end surfaces 7 and 8. It is also received on the supporting protrusions 16a and 16b of the protruding supporting member 16 and is held in a state in which the tube axis direction is accurate and stable in the direction orthogonal to the cutting direction of the straight blades 9a and 9b on both sides. When the grip portion 2 of the cutter main body which is being held in this state is operated to rotate the cutter main body 1 around the pipe axis of the heat insulation coating pipe A, a predetermined portion of the heat insulation coating pipe A is fixed to the straight blade 9a, It is cut a1 by 9b while leaving the inner peripheral surface side slightly thin over the entire circumference.

Next, after the cutter body 1 is once separated from the heat insulation coating pipe A, the front end bending end 4a of the jaw 4 projecting forward from the front end of one straight blade 9a is connected to the heat insulation coating pipe A described above. Insert it into a proper place of the cut portion a1 and, as shown in FIGS. 6 and 7, pierce the thin portion remaining on the inner peripheral side of the cut portion a1 at the outer end surface of the bent end portion 4a and heat-insulate the straight blade 9a. Aim the tip of tube A. In this state, when the cutter body 1 is moved toward the tip in the length direction of the heat insulation coating pipe A,
A straight blade using the bent end 4a inserted between the inner peripheral surface of the heat insulating coating A and the coating film D of the hot and cold water supply pipes B and C inside the heat insulating coating A as a guide. By 9a, a part of the heat insulation coating pipe A is linearly divided a2 from the cut portion a1 to the tip surface.

After that, when a fingertip is inserted into the divided a2 portion of the heat insulating coating and the divided facing surface is expanded in the direction of separating, it remains on the inner peripheral side of the cut portion a1 of the heat insulating coating A. The heat insulation coating pipe A is expanded while the thin portion is separated, and the heat insulation coating pipe portion between the tips is removed from the cut portion a1 to expose the hot and cold water supply pipes B and C to the outside.

In this manner, the tip end of the heat insulating coating pipe A is removed to expose the end portions of the hot and cold water supply and discharge pipes B and C, and then the tubular coating for covering the hot and cold water supply pipes B and C is covered. The peeling operation of the film D is performed. This work, as shown in FIGS. 8 and 9,
A V-shaped space formed between the opposing peripheral surfaces of the hot and cold water supply and discharge pipes B and C that are aligned with the other jaw 5 of the cutter body 1 toward the front end surfaces of the hot and cold water supply pipes B and C. Insert from the tip side into the portion a3 and press the outer end surface (lower surface) of the jaw portion 5 between the hot and cold water supply pipes B and C, or press the end portion of the covering film D to feed the end portion. The hot water discharge pipes B and C are immersed and brought into contact with the hot and cold water supply pipes B and C.

At this time, in the two body halves 1a, 1b forming the cutter body 1, one of the jaw pieces 5 ', 5'forming the other jaw 5 is used as the straight blade 9b. From the front end of the straight blade 9b is located rearward from the front end of the straight blade 9b by projecting slightly forward from the other jaw piece 5 '.
Moreover, the outer end surface of the jaw piece 5'projecting from the straight blade 9b is gradually inclined toward the front end of the straight blade 9b.
Since it is formed in 5a, when the jaw part 5 is pressed against the upper peripheral surface in the part where the hot and cold water supply pipes B and C are aligned and opposed to each other, as shown in FIG.
As shown in, the inclined end surface 5a of the jaw piece 5'slides down on the outer peripheral surface of the hot water supply pipe B or the hot water discharge pipe C toward the joint facing surface between the hot water supply and discharge pipes B, C, The straight blade 9b in contact with the inner surface of the piece 5'is automatically and accurately positioned at the center of the V-shaped space portion a3 in the width direction.

When the cutter main body 1 is moved in the lengthwise direction of the hot and cold water supply pipes B and C in this state, the straight blade 9b is held while the jaw piece 5'is held between the hot and cold water supply pipes B and C. It is possible to accurately move the hot and cold water supply pipes B and C in the length direction, and reliably and smoothly divide and remove the tubular coating film D.

In the above embodiment, the blade body 9 having the straight blades 9a and 9b on both sides is moved in the front-rear direction by using the elongated hole 11 provided in the enlarged head 3 of the cutter body 1 as a guide. As a mechanism for fixing after that, the screw rod portion of the screw member 12
A mechanism for crimping the lower surface of the head 12c of the 12a onto the enlarged head 3 is adopted, but as shown in FIGS. 11 and 12, in the body halves 1a and 1b forming the cutter body 1, these The main body halves 1a and 1b are provided with the long hole 11 in common, and the main body halves 1a are provided with circular holes 11a and 11b having a diameter larger than the width of the long hole 11 at both ends of the main body half piece 1a. This circular hole 11a,
A circular nut body 12b 'is detachably fitted to either one of the 11b, and the screw rod portion of the screw member 12 is inserted from the other main body half piece 1b side.
The end portion of 12a is inserted into the central portion of the rear end of the blade body 9 in a connected state and screwed into the circular nut body 12b ', and the head portion 12c of the screw rod portion 12a and the main body half piece 1b are joined together. The structure may be such that the spring 15 is interposed between the opposed surfaces in a compressed state. Since other configurations are similar to those of the above-described embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

With this construction, when not in use, the circular nut body 12b 'is fitted and locked in the rear circular hole 11b so that the blade body 9 unexpectedly indents the straight blades 9a, 9b on both sides thereof. It is maintained in a state in which it is prevented from projecting from the arcuate pipe receiving end faces 7 and 8. When using, the head portion 12c of the screw rod portion 12a
When pushing down against the force of the spring 15, the circular nut body 12b 'separates from the circular hole portion 11b, so while maintaining this state, move the screw rod portion 12a forward and move it to the front end of the long hole 11. When the pressing force is released when it reaches, the screw rod portion 12a is pushed up by the restoring force of the spring 15 and the circular nut body 12b 'is fitted into and locked in the circular hole portion 11a on the front side, so that both sides of the blade body 9 are directly connected. The blades 9a, 9b are held in a state of protruding from the pipe receiving end surfaces 7, 8 having a concave arc shape for a predetermined length.

In the above embodiments, the case where the heat insulation coating pipe A covering the hot and cold water supply pipes B and C used for floor heating is cut by the cutting cutter of the present invention has been described. In addition to the heat insulation coating pipe that covers the going pipe and the return pipe such as the hot and cold water supply pipe, for cutting the heat insulation coating pipe that covers the air conditioner, the bath heating, the bath drying, the bath hot water, and the reheating pipe, Further, it can also be used for cutting a heat insulating coating tube in which a single plastic tube for supplying water or hot water is installed. It can also be applied when the tube is not covered by the covering film D.

[0038]

As described above, according to the cutting cutter for adiabatic cladding of the present invention, both sides of the front half of the enlarged head of the cutter body are bifurcated to form the jaws, and these jaws are formed. Between the opposing inner end surfaces of the jaws are formed in a heat-insulating sheathed pipe receiving opening which is widened toward the front, and the opposite inner end faces of the both jaws forming the peripheral portion of the receiving mouth are concave arc-shaped heat-insulating sheathing pipe receiving members. It is formed on the toe surface, and straight blades on both jaws are inclined outwardly from the rear end toward the front end in a V shape, and the front and rear ends intersect the concave arc-shaped receiving end surface. Since the protruding width of the straight blade from the concave arc-shaped receiving end surface is gradually narrowed from the central portion in the lengthwise direction of the straight blade toward the front and rear ends, a hot and cold water supply pipe, etc. The part to be cut of the heat-insulating coated pipe that covers the other pipe is orthogonal to the heat-insulating coated pipe receiving port of the cutter The straight-cut blades on both sides can be directly contacted with the straight-cut blades so that the heat-insulated sheathed pipe can be easily cut in the thickness direction, and the heat-insulated sheathed pipe can be easily cut. Since both sides of the outer peripheral surface are contacted with and received by the recessed arcuate receiving end surface, the straight blade can be accurately cut to a predetermined depth of the heat insulating cladding without further cutting.

In addition, the cutting cutter has the heat-insulating cladding receiving end face formed in a concave arc shape, and the protruding width of the straight blade protruding from the concave arc-shaped receiving end face is the length thereof. Since the width is gradually narrowed from the central portion in the direction toward the front and rear ends, when cutting the large-diameter heat-insulated cladding pipe, both sides of the outer peripheral surface of the large-diameter heat-insulated cladding pipe are V-shaped with respect to each other. Cut to the depth that slightly leaves the thickness of the inner peripheral surface side by the central portion in the length direction of the opposing straight blades, that is, the blade portion protruding most widely from the concave arc-shaped receiving end surface. When cutting the small-diameter heat-insulated cladding tube, both sides of the outer-diameter surface of the small-diameter heat-insulated cladding tube have a narrow projection width from the concave arc-shaped receiving end surface of the straight blade on both sides of the inner circumferential surface side. It is possible to cut to a depth that leaves a slight thickness .

In this way, the straight blades on both sides are cut from both sides of the outer peripheral surface of the heat insulating cladding tube to a depth with a slight thickness left on the inner peripheral surface side, and then the handle of the cutter body is wrapped around the heat insulating cladding tube. By rotating the heat-insulating coating pipe to a predetermined portion, it is possible to cut a predetermined portion of the heat-insulating coating pipe by a straight blade with the inner peripheral surface side left slightly thin, and thus the heat-insulating coating pipe is coated. It is possible to cut a predetermined portion of the heat insulation coating pipe accurately and efficiently without damaging the internal pipes such as the hot water supply and discharge pipes.

According to the second aspect of the present invention, the cutter body is formed by superposing two body halves and integrally connecting them, and between the inner end surfaces of the body halves facing each other. A plate-shaped blade body integrally provided with a pair of straight blades inclined outward in a V-shape from the rear end side of the receiving end surface toward the front ends of both sides appears in the front-back direction from the receiving end surface. Since it is freely interposed, the structure is simple and can be manufactured at low cost, and the blade body is smoothly and accurately moved back and forth through the gap between the two body halves to emerge from the concave arc-shaped receiving end surface. Can be made.

Further, according to the invention of claim 3, the front end of one jaw of the cutter body is projected forward from the front end of the straight blade on the side of the jaw, and the front end is directed inward. Since it is formed on the bent end that is bent, by inserting this bent end at the appropriate place in the cutting point of the heat insulation coating pipe, the heat insulation coating pipe without damaging the pipes such as the hot water supply and discharge pipes inside. The remaining thin portion on the inner peripheral side of can be easily pierced by the outer end surface of the refraction end portion, and further,
Since this refraction end is maintained in a state of being interposed between the inner peripheral surface of the heat insulation coating pipe and the coating film of the pipe such as the hot and cold water supply pipe,
Accurately moving the refracting end part in the length direction of the heat insulation coating pipe with respect to the straight blade while smoothly dividing the heat insulation coating pipe to the tip surface without damaging the hot and cold water supply pipe by the straight blade. After the division, the thin wall portion on the inner peripheral side can be easily separated by expanding the space between the division facing surfaces of the heat insulation coating pipe, and the pipes such as the hot water supply / exhaust pipe can be exposed.

According to the invention of claim 4, the cutter main body is formed by combining two main body half pieces, and at the portion forming the other jaw part, one of the main body half pieces is formed. By projecting the jaw piece slightly forward from the front end of the straight blade and placing the jaw piece of the other body half piece rearward with respect to the front end of the straight blade, the front end portion of the straight blade is made one body half piece. Since it is exposed in contact with the inner surface of the jaw piece, the outer end surface of the jaw piece in this one body half piece is formed into an inclined end surface that gradually becomes thinner toward the front end portion of the straight blade, Insert the outer end face of the jaw into the V-shaped space formed between the opposing peripheral surfaces of the two aligned pipes such as the hot water supply pipe and the hot water discharge pipe, or press it on the tubular covering film. By touching, the slanted end of the jaw piece on one body half By this, the straight blade can be automatically positioned at the center portion in the width direction of the V-shaped space portion, and the tubular film is supplied and discharged without contact with the pipe such as the hot water supply and discharge pipe. It is possible to reliably and smoothly divide the pipe such as a pipe in the longitudinal direction.

[Brief description of drawings]

FIG. 1 is a perspective view of a cutting cutter,

FIG. 2 is a front view thereof,

FIG. 3 is a side view in which a part thereof is cross-sectioned,

FIG. 4 is a perspective view showing a usage state,

FIG. 5 is its front view,

FIG. 6 is a usage state diagram when the heat insulating cladding is divided in the length direction,

FIG. 7 is a perspective view of a part thereof,

FIG. 8 is a state of use when cutting the covering film,

FIG. 9 is a perspective view of a part thereof,

FIG. 10 is a plan view showing a cut state,

FIG. 11 is a front view showing another embodiment of the present invention,

FIG. 12 is a side view thereof.

[Explanation of symbols]

1 cutter body 2 Handle 3 enlarged head 4,5 jaws on both sides 4a Bent end 6 pipe socket 7,8 Concave arc-shaped pipe receiving end face 9 blades 9a, 9b Straight blade A heat insulation cladding B, C hot water supply and drainage pipe D coating film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshimitsu Takahashi             1-8-2, Marunouchi, Chiyoda-ku, Tokyo 3             Within Ryogaku Sansan Co., Ltd. (72) Inventor Muneki Shimada             158 Minoyama, Sakai City, Osaka Prefecture Sue Co., Ltd.             In the par tool F term (reference) 3C061 AA26 BA03 BA24 BA29 BA31                       BB01 EE22 EE27 EE28                 5G353 AA08 AC05 CA07 DA05

Claims (4)

[Claims] 1. A cutting cutter for a heat insulating coating pipe made of foamed synthetic resin, which covers a pipe such as a hot and cold water supply pipe and a water supply pipe, wherein the cutter body has a flat plate-shaped enlarged head integrally formed at a front end of a handle portion. The bifurcated front half both sides of this enlarged head are formed into jaws, and at the same time, the space between the opposed inner end faces of these jaws is expanded to the heat insulation cladding pipe receiving port. The opposite inner end faces of the both side jaws which form the peripheral portion of the receiving port are formed as concave arc-shaped heat insulating cladding receiving end faces, and further, straight blades are formed on the both side jaws from the rear end. The protruding width of the straight blade from the concave arc-shaped receiving end surface is provided so as to be inclined outwardly toward the front end in a V shape, and the front and rear ends of the concave arc-shaped receiving end surface intersect with each other. Is gradually narrowed from the center of the straight blade in the lengthwise direction toward both front and rear ends, and large and small diameter insulated cladding pipes are projected. A cutting cutter for a heat-insulated cladding, characterized in that the blade has a large width and a blade having a small width is configured to perform cutting while leaving a slight thickness on the inner peripheral surface side. 2. The cutter body is formed by stacking two body halves on top of each other and integrally connecting the two body halves, and the rear end side of the heat-insulating pipe receiving end face between the opposing inner end faces of the body halves. A pair of straight blades, which are slanted outward in a V-shape toward the front ends from both sides, are integrally provided so as to be retractable in the front-rear direction from the receiving end surface. The cutting cutter according to claim 1, which is characterized in that: 3. A front end portion of one jaw portion is formed as a refraction end portion in which the front end portion of the straight blade on the jaw portion side is projected forward and the front end portion is bent inward. The cutting cutter according to claim 1, wherein 4. The jaw of one of the body halves is slightly protruded forward from the front end of the straight blade in the portion of the two body halves forming the other jaw, and the jaw of the other body half is protruded. By providing the piece rearward with respect to the front end of the straight blade, the front end of the straight blade is exposed by contacting the inner surface of the jaw of one body half and the jaw of this one half of the body. The cutting cutter for a heat insulation coated pipe according to claim 1 or 2, wherein the outer end surface of the piece is formed as an inclined end surface that gradually becomes thinner toward the front end portion of the straight blade.