JPH0857701A - Tube surface cutting scraper - Google Patents

Abstract

PURPOSE: To uniformly cut a surface of a resin tube easily and safely by providing a cutting tool for cutting an outer circumferential surface of the resin tube outside fitted to a core member on the aperture side of a cap-shaped grip part outside fitted to the core member from the end part side of a male screw to cover an end part of the resin tube. CONSTITUTION: A chamfered part 33 of a cutting tool 3 is pushed up on an outer surface of a resin tube 5, the resin tube 5 is inserted, and a core member 1 is inserted into an inner surface of the resin tube 5 to be fixed. Next, a grip part 22 is taken by hand to be rotated to thread a male screw 21 of a shaft 25 with a female screw 11 of the core member 1, and the cutting tool 3 is retracted spirally to cut the surface of the tube 5 by a cutting edge 34 of the cutting tool 3. Rotation of the grip part 22 is performed till a washer 23 provided at the end part of the male screw 21 reaches an escape step part 16 in an inner surface of the core member 1, where the cutting edge 34 of the cutting tool 3 reaches an end surface 51 of the resin tube 5 to complete cutting work to the tube surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe surface for cutting an outer peripheral surface of a pipe in order to remove dirt and oxide film on a connecting end portion of the resin pipe when the resin pipe is fusion-bonded to a resin joint. The present invention relates to a scraper for cutting.

[0002]

2. Description of the Related Art A conventional tool for cutting a pipe surface is shown in FIG. 10 disclosed in Japanese Utility Model Laid-Open No. 63-189521. When cutting the pipe surface, this is provided with a threaded member 94 protruding from a guide ring 95 that is threadedly engaged with the male thread of the shaft 93, and a handle nut 96 threadedly engaged with this threaded member 94 is tightened to set the bite holder 97. The handle nut 96 is pressed against the surface of the pipe 5 and cut while rotating the handle nut 96 around the resin pipe 5. In addition, fixing with the pipe 5
The rubber plug 98 inserted into the inner surface of the pipe is axially compressed and expanded by tightening the nut 99, and the shaft 93 is attached to the inner surface of the pipe 5.
Is to fix.

[0003]

SUMMARY OF THE INVENTION The conventional scraper described above adjusts the force for pressing the cutting tool against the surface of the pipe 5, and
The handle nut 96 and the nut 99 must be tightened to fix each other.
It is difficult to adjust the degree of tightening because the cutting depth on the surface of the pipe 5 is affected. Further, when the handle nut 96 is rotated to rotate the cutting tool around the pipe 5, there is a problem that the degree of tightening of the handle nut 96 changes during the rotation. Therefore, there is a problem that it is difficult to perform the work of rotating the cutting tool during the cutting work. The present invention solves the above problems and provides a scraper for cutting a surface of a resin pipe which is small and lightweight and has good workability.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is a cylindrical shape having an outer peripheral surface which is inserted into an inner surface of an end portion of a resin pipe and fixed to the resin pipe, and a guide portion into which a screw is screwed. A cap-shaped grip portion having a core member and a male screw threadedly engaged with a guide portion of the core member on an axial center side and covering an end portion of a resin pipe externally inserted into the core member from an end portion side of the male screw. And a cutting tool that is provided on the opening side of the grip portion and cuts the outer peripheral surface of the resin pipe that is externally inserted into the core member, and is a scraper for pipe surface cutting. In the above, the guide portion of the core member is of a ratchet type which is screwed with the male thread and is detached from the male thread when the male thread is forcibly pressed in the axial direction. Is. Further, in the above, on the outer peripheral surface of the grip portion,
A scraper for pipe surface cutting, in which a substantially annular spring member having a slit in a part of its circumference is mounted, in which a part of the inner peripheral surface contacts the outer surface of the cutting tool and presses the cutting tool toward the axial center side.
Further, in the above, a scraper for pipe surface cutting is provided, which is connected to a rotation driving device for rotating the grip on the end side of the grip, and which is rotatably held by the outer peripheral surface of the grip. is there.

[0005]

The present invention has the above-mentioned structure. When the core member screwed into the male screw on the shaft center side of the grip is inserted into the inner surface of the end of the resin pipe, the elastic force of the resin pipe causes the resin pipe and the core member to be separated from each other. Fixed. When the grip portion is rotated by hand in this state, the male screw provided on the axial side of the grip portion is screwed into the guide portion of the core member, and the grip portion moves back and forth. For this reason, the cutting tool provided on the opening side of the grip portion moves back and forth in the axial direction while rotating around the resin pipe inserted into the core member, and cuts the outer peripheral surface of the end portion of the resin pipe.
Since the grip part covers the cutting part of the bite like a cap, work can be performed safely, and it is safe because the bite is on the inner surface side of the grip part even when it is not inserted into the resin pipe. Further, since the core member is inserted into the resin pipe, flatness and bending of the resin pipe are corrected. Therefore, the resin pipe is a perfect circle and is cut in a straight pipe state, so that a uniform pipe surface is cut. If the guide part of the core member is a ratchet type, the work of rewinding the male screw of the grip part to the cutting start position is omitted, and after the core member is mounted on the pipe, the grip part can be easily gripped by pushing in the axial direction of the pipe. The external thread of the section can be set to the position where the cutting of the pipe is started. Therefore, the rewinding work of the grip portion after the work is completed is omitted, and the work is simplified. Further, by mounting a substantially annular spring member that presses the cutting tool toward the axial center on the outer peripheral surface of the grip portion, the cutting tool presses the tube surface with a uniform force, so that uniform cutting can be performed. Further, by providing a rotary drive device at the end of the grip portion so as to be rotatable with the grip portion, the work can be easily performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a state where the scraper according to the first embodiment of the present invention is mounted on a resin pipe 5. Main components are a core member 1, a main body 2 with a male screw shaft 25 screwed to the core member 1, and a cutting tool 3 fixed to the main body 2. The core member 1 has a substantially cylindrical shape, and the male screw 2 of the main body 2 is provided on the inner surface.
There is provided an escape portion 12 for the internal thread 11 and the external thread which are screwed together with 1 to serve as a guide portion. Further, as shown in an enlarged scale in FIG. 2, the outer peripheral surface is provided with an insertion portion 13 to be inserted into the inner surface of the end portion of the resin pipe 5, a large diameter portion 14, and a step portion 15 between which the end surface 51 of the resin pipe abuts. is there. The insertion portion 13 has an outer diameter dimension that matches the inner diameter dimension of the resin pipe, and an annular uneven portion 16 slightly larger than the inner diameter of the resin pipe 5 is provided near the step portion 15 so as to be securely fixed to the resin pipe 5. .

The main body 2 is integrally provided with a shaft 25 having a screw 21 on the axial center side of the cap-shaped grip portion 22, and the bite 3 is fixed to the inner surface of the opening end of the grip portion 22. The core member 1 is screwed onto the male screw 21 to provide a washer 23 and a nut 24 at the tip of the screw 21, so that the core member 1 is attached to the male screw shaft 2
It prevents it from coming off from 5. FIG. 3 shows the cutting tool 3, in which a bolt 31 inserted from the outside of the grip portion 22 is screwed into a fixing screw hole 32 to be fixed. A chamfered portion 33 is provided so that the resin pipe 5 can be easily inserted. Reference numeral 34 is a cutting edge for cutting the outer peripheral surface of the resin pipe 5, and a step 35 is provided from the contact surface 36 corresponding to the required cutting depth. The distance of the step 35 is usually 0.1 to 0.3 mm. The cap-shaped grip portion 22 of the main body 2 is a thin-walled cylindrical shape made of a material having elasticity such as metal or plastic, and the elastic force of the cap-shaped grip portion 22 causes the bite 3 to move into the resin pipe 5.
It is pressed against the surface of with a moderate force.

Next, the procedure for cutting will be described.
First, as shown in FIG. 1, the scraper body 2 is prepared in a state where the internal thread 11 of the core member 1 is screwed into the male thread 21 of the shaft 25. Next, the insertion portion 13 of the core member 1 is inserted into the inner surface of the end portion of the resin pipe 5 so that the end portion 51 of the resin pipe 5 becomes the step portion 1.
Hold the grip portion 22 until it hits 5. At this time, the chamfered portion 33 of the cutting tool 3 is pushed up by the outer surface of the resin tube 5 to insert the resin tube 5, and the core member 1 is inserted and fixed to the inner surface of the resin tube 5. Next, when the hand grip 22 is rotated by hand, the male screw 21 of the core member 1 is screwed with the male screw 21 of the shaft 25, so that the cutting tool 3 recedes in a spiral shape, and the cutting edge 34 of the cutting tool 3 causes the cutting tool 34 of the pipe 5 to move. The surface is cut. The grip portion 22 is rotated until the washer 23 provided at the end of the male screw 21 hits the relief step portion 16 on the inner surface of the core member 1, and the cutting edge 34 of the cutting tool 3 is at this position. When the number reaches 51, the cutting work of the pipe surface is completed. In addition, in order to secure the pressing force of the cutting tool 3 against the resin pipe 5, the grip portion 22 of the cutting tool 3 is secured.
A coil spring or a spring washer may be attached to the attachment part to give the bite elasticity.

FIG. 4 is a sectional view showing a second embodiment of the present invention. The difference from the first embodiment is that instead of the internal thread 11 of the core member 1, a ratchet-type feed guide portion 7 that engages with the screw 26 is provided, and the core member 1 is attached to the external thread 26 before starting cutting. This is to omit the screw-return preparation work for the grip portion 22 that is screwed to the inside. Axis 2 of body 2
5 is formed with an external thread 26 having an inclined surface only on one side,
The core member 17 is provided with a ratchet type guide portion 7 that is screwed into the screw 26. The guide portion 7 is provided with a large-diameter hollow portion 18 and a small-diameter hollow portion 19 through which the screw 26 is inserted on the inner circumference of the core member 17, and a hole 74 is provided in a part of the small-diameter hollow portion 19 side, and the main body is provided in this hole 74. The ratchet type guide portion 7 is provided by providing a pawl 71 that is screwed to the male screw 26 of the second screw, a spring 72 that pushes the pawl 71 toward the male screw 26, and a set screw 73 that holds the pawl 71 and the spring 72 in the hole 74. Is forming. Claw 71 is spring 72
When the male screw 26 of the main body 2 is rotated, the pawl 71 is engaged with the male screw 26 and the male screw 21 moves forward and backward. Further, when the main body 2 is strongly pushed in the axial direction, the male screw 26 of the main body 2 becomes an inclined surface in the direction of being disengaged from the pawl 71, and the pawl 71 is pushed by the spring 72. When 72 is compressed and disengaged from the screw with the screw 26, the shaft 25 of the male screw can move on the inner surface of the core member 17.

In the scraper of this embodiment, when the cutting with the pipe 5 is completed, the main body 2 is separated from the core member 17, that is, the position of the male screw 26 screwed into the core member 17 is the end of the male screw shaft 25. Although it is on the washer 23 side of the portion, when the core member 17 is inserted from the end of the pipe 5 for cutting the next resin pipe 5, the core member 17 receives the pushing force into the resin pipe 5, The pawl 71 of the ratchet type feed guide portion 7 of the core member 17 is disengaged from the male screw 26, and the male screw 26 moves on the inner surface of the core member 17 in the axial direction. Then, as shown in FIG. 4, the core member 17 comes into contact with the inner surface rear end surface 27 of the main body 2, and the insertion portion of the core member 17 is inserted into the resin pipe 5.
Thus, by providing the ratchet type feed guide portion 7 in the threaded portion of the core member 17 with the male screw 26, the resin pipe 5
After the cutting is finished, it is not necessary to perform the laborious preparation work of the gripping portion 62 for rotating the gripping portion 22 in the opposite direction to the initial state by cutting the gripping portion 22 in order to cut the next pipe.

The bite 30 is attached to the mounting hole 36 by the grip portion 2
It is designed to be fixed with bolts 31 in the axial direction from the opening side of 2, and the shape of the cutting tool 30 is shown in FIG. A chamfered portion 37 forms a step portion 38 and is cut by a cutting edge 39. In addition, a boss 29 having a hexagonal hole 28 is provided at the end of the main body 2 in the axial direction so that the grip portion 22 can be rotated by another electric tool or the like.

FIG. 6 is a sectional view showing a third embodiment. In this embodiment, a shaft 25 with a male screw 26 is made of metal, a grip 22 is made of resin, and a metal body 20 is made of metal. The male threaded shaft 25 is integrated by insert molding.

FIG. 7 shows a fourth embodiment of the present invention.
In this embodiment, the bite 3 attached to the opening side of the grip 22
The spring member 41 for pressing the outer surface of 0 to the axial center side is gripped by the grip portion 22.
It is mounted in a groove 42 provided on the outer peripheral surface of the. As shown in FIG. 8, the spring member 41 is made of steel in which a slit 43 is provided on a part of the circumference, and a part 40 of the bite 30 enters the slit 43 so that the inner surface near the slit is the outer surface of the bite 30. It is pressed. The cutting tool 30 is attached by screws 44 so as to be movable toward the axial center. Male thread 26
The shaft 25 and the main body 20 with the grip 22 are connected and fixed by bolts 45. Since the spring member 41 presses the outer surface of the cutting tool 30 with the inner surface near the slit portion 43,
An appropriate pressing force that presses the cutting tool 30 against the resin pipe 5 side acts on 1.

FIG. 9 shows a fifth embodiment of the present invention.
A drive unit is provided in the fourth embodiment to automate the rotation of the grip portion 22. DC motor 8 in case 8
1 and a speed reducer 82 are housed, and the output shaft 93 is fitted to the boss 29 of the grip body 20. The case 8 and the main body 20 are fixed to each other between the outer peripheral surface of the grip portion 22 and the inner peripheral surface of the mounting cylinder 84 extending so as to cover the grip portion 22 of the case 8. The grip 22 is fixed rotatably. The power source of the motor 81 is DC12 or DC24 attached to a controller power source for cutting the resin pipe 5 with this device and then performing electric fusion connection.
Taken from a volt power supply. Reference numeral 86 is a switch of the motor 81, and after inserting the resin tube 5 by holding the case 8, the switch 86
When the switch is turned on, the motor 81 is driven to perform the cutting work, and the switch 86 is automatically turned off when the cutting work is completed.

[0015]

As described above, according to the present invention, the male screw of the main body is screwed with the guide portion of the core member only by inserting the core member into the end portion of the resin pipe and rotating the grip portion. A cutting tool provided on the inner surface of the grip portion rotates around the resin pipe to advance and retreat to perform cutting. Therefore, the surface of the resin pipe can be easily and safely cut uniformly. In addition, it has a compact size, has a simple structure and is easy to handle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view before cutting, which is attached to a resin pipe showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a partially enlarged sectional view of an outer peripheral surface of a core member.

FIG. 3 is a perspective view showing the cutting tool 3 of FIG. 1.

FIG. 4 is a cross-sectional view before cutting, which is mounted on a resin pipe showing a second embodiment of the present invention.

5 is a perspective view showing the cutting tool 30 of FIG. 4. FIG.

FIG. 6 is a cross-sectional view before cutting, which is mounted on a resin pipe showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional view before cutting, which is mounted on a resin pipe showing a fourth embodiment of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a cross-sectional view before cutting, which is mounted on a resin pipe showing a fifth embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

1, 17 Core member 2, 20 Main body 3, 30 bytes 5 Resin tube 7 Ratchet type feed guide part 11 Core member internal thread 13 Core member insertion part 14 Core member large diameter part 15 Core member step part 16 Core member Annular irregularities 21, 26 Male screw 22 Grip part of the main body 25 Male screw shaft 28 Hexagonal hole 29 Boss 31, 44, 4
5 Bolt 33, 37-byte guide portion 34, 39-byte cutting edge 35, 38-byte step portion 40-byte 3
Part of 0 41 Substantially annular spring member 42 Groove of grip portion 43 Split portion of spring member 41 71 Guide portion 7
Notch 72 Spring of guide portion 73 Guide portion 7
Set screw 8 Case 81 Motor 82 Reducer 83 Output shaft of drive unit 84 Mounting tube 85 Bearing 86 Switch

Claims (4)

[Claims] 1. A cylindrical core member having an outer peripheral surface inserted into an inner surface of an end portion of a resin pipe and fixed to the resin pipe, and a guide portion into which a screw is screwed on the inner surface, and a guide portion of the core member. A cap-shaped grip portion having an external thread to be screwed on the shaft center side and covering the end of the resin pipe externally inserted into the core member from the end side of the external thread, and provided on the opening side of the grip section. A pipe surface cutting scraper, comprising: a cutting tool for cutting the outer peripheral surface of a resin pipe externally inserted into the core member. 2. The guide portion of the core member comprises a ratchet type guide portion that is screwed into the male screw and is disengaged from the male screw when the male screw is forcibly pressed in the axial direction. The scraper for cutting a pipe surface according to claim 1. 3. A substantially annular spring member that is attached to the outer peripheral surface of the grip portion and has a slit in a part of the circumference,
2. A part of an inner peripheral surface of the spring member is in contact with an outer surface of the cutting tool to press the cutting tool toward an axial center side.
A scraper for pipe surface cutting according to any one of 1 to 3 above. 4. A rotary drive unit for rotating the grip unit is connected to an end side of the grip unit, and the rotary drive unit is rotatably held by an outer peripheral surface of the grip unit. The scraper for pipe surface cutting according to claim 1.