JP3402546B2 - Scraper for pipe surface cutting - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional tool for cutting a pipe surface, there is a tool shown in FIG. 6 disclosed in Japanese Utility Model Laid-Open No. 63-189521. In this case, when cutting the pipe surface, a threaded member 94 is provided so as to project on a guide ring 95 threadedly engaged with a male thread of a shaft 93, and a handle nut 9 threadedly engaged with this threaded member 94.
6 is tightened, the bite holder 97 is pressed against the surface of the pipe 5, and the handle nut 96 is cut while rotating around the resin pipe 1. Further, the rubber plug 98 inserted into the inner surface of the pipe is compressed and expanded in the axial direction by tightening the nut 99, and the shaft 93 is fixed to the inner surface of the pipe 5.

As another conventional technique, Japanese Patent Laid-Open No. 4-358 is known.
There is the one shown in FIG. This is a rotary body 2 fitted from the end of a plastic tube 1, a cutter 3 supported by the rotary body 2, and an arm 4 with a shaft support 5 of the arm 4 as a fulcrum so as to project the cutter 3 radially inward. 4, a cutter urging portion in which the end portion of 4 is urged by a coil spring 11, a core 6 inserted into the end portion of the pipe 1, and a bolt 7 protruding from the shaft core portion of the rotating body 2 and the bolt 7. The cutting tool is composed of a claw 10 provided on a core 6 which is elastically contacted with a saw blade screw 8 by a spring 9 and screwed. This is one in which the claw 10 is disengaged from the saw blade screw 8 of the bolt 7 by pushing or pulling the core 6 or the rotating body 2 in the axial direction, and can be moved back and forth with one touch.

[0004]

The former former scraper of the above-mentioned prior art has a handle nut 96 and a nut 99 for adjusting the force for pressing the cutting tool against the surface of the pipe 1 and for fixing the pipe 5 respectively. It must be tightened, and adjustment of the degree of tightening of the handle nut 96 particularly affects the cutting depth on the surface of the pipe 5, which is difficult. Further, when the handle nut 96 is rotated to rotate the bite around the pipe 1, 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 latter cutting tool of the above-mentioned prior art has a good workability because the core 6 or the rotating body 2 can be moved back and forth in the axial direction with a single touch, but the cutting chips obtained by cutting the surface of the pipe 1 are the same as those of the rotating body 2. Since the chips are stored inside and there is no place for the chips to escape, the screwing of the saw blade screw 8 of the bolt 7 and the claw 10 is prevented. In particular, when the rotating body 2 and the core 6 are screwed together, the claw 10 is screwed onto the male screw 8 of the bolt 7 protruding from the rotating body 2, so that the chips are attached to the surface of the saw blade male screw 8. Claw 10 has male thread 8
It becomes difficult to rotate the rotating body. Further, the urging portion of the cutter 3 is an arm 4 having a shaft support 5 as a fulcrum.
Is urged by a spring 11 in a so-called lever type, and the arm 4 and the spring 11 must be mounted in the rotating body 2, the number of parts is large, the structure is complicated, and a large area is required for mounting on the rotating body 2. Requires a large rotating body. Further, since this biasing portion is exposed on the outer peripheral surface of the rotating body, workability is not good. Further, since the core 6 and the rotating body 2 are connected and supported only by the claws 10, it is unstable to keep the axis lines of the core 6 and the rotating body 2 in a straight line, so that they cannot be screwed smoothly and workability is improved. Was not good. The present invention solves the above problems,
(EN) A scraper for cutting a resin pipe surface, which is small and lightweight, has good workability and does not clog chips.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is a cylindrical shape having an outer peripheral surface which is inserted into the inner surface of the end of the resin pipe and is locked to the inner surface of the resin pipe, and a female thread for guiding on the inner surface. A core member, a shaft to be inserted into the inner surface of the female screw of the core member, and a screw which is provided on a part of the shaft and which is normally screwed to the female screw and forcibly presses the shaft to be disengaged from the female screw. A rotating body having a ratchet-type threaded portion formed as described above, and a cap-shaped grip that covers the end of the resin pipe externally inserted into the core member from the end side of the shaft, and a cap-shaped grip of the rotary body. A cutting device provided on the opening side for cutting the outer peripheral surface of the resin pipe externally inserted into the core member, the outer peripheral surface of the core member and the rotating body.
Install an O-ring between the inner peripheral surface of the
The scraper for pipe surface cutting is characterized by sliding on the inner peripheral surface of the rotating body .

A circumferential projection is formed on the opening side end of the rotating body.
The outer circumference of the circumferential protrusion is provided with a substantially annular spring member having a slit on the circumference, and the inner peripheral surface of the spring member is contacted to press against the surface of the resin pipe. The cutting device can be provided. Also in the above,
A rotary drive unit for rotating a rotary body is provided on the end side of the cap-shaped grip, and the rotary drive unit is rotatably held by the outer peripheral surface of the grip to form a scraper with a rotary drive unit. Can be done.

[0008]

The present invention has the above-mentioned structure, and by inserting the core member which is screwed into the ratchet type screwing portion provided on the rotating body shaft into the inner surface of the end portion of the resin pipe, the elastic force of the resin pipe causes The core member is fixed. By rotating the rotating body by hand in this state, the ratchet type screwing part provided on the shaft of the rotating body is screwed with the guiding female screw of the core member, and the rotating body is guided along the guiding female screw of the core member. Move back and forth in the axial direction. For this reason, the cutting tool provided on the opening side of the cap-shaped rotating body advances and retreats in the axial direction while rotating around the resin tube inserted into the core member, and cuts the outer peripheral surface of the end portion of the resin tube. The rotating body covers the entire cutting part of the cutting tool in a cap shape, so that the work can be performed safely, and it is safe because the cutting tool is on the inner surface side of the rotating body even before being used without being inserted into the resin pipe. Further, since the core member is inserted into the inner surface of the resin pipe, flatness and bending of the resin pipe are corrected. Therefore, the resin pipe is a perfect circle and cutting is performed in a straight pipe state,
A uniform pipe surface is cut.

By the female thread for guiding the core member and the ratchet type screwing portion provided on the shaft of the rotating body, the work of rewinding the cutting tool provided on the rotating body to the cutting start position is omitted, and the core member is rotated after being mounted on the pipe. By simply pulling or pushing the body in the axial direction of the pipe, the bite position of the rotating body can be easily brought to the cutting start position state for the pipe. Therefore, the rewinding work of the rotary body after the work is completed and the rewinding work of the rotary body at the start of the work are omitted, and the work is simplified. Also, there are no screws on the rotary shaft,
The guide of the rotating body is provided by a screw to be provided on the core member, and the shaft is inserted into and retracted from the inner peripheral surface of the female screw, so that the female screw is not exposed in the rotating body, and therefore the guide female screw is There is no problem of chips adhering, there is no concern that the chips interfere with the guide of the rotating body, and the guide is performed smoothly. Also, by attaching a substantially annular spring member having a notch in a part of the circumference that presses the bite to the shaft center side on the outer peripheral surface of the rotating body, the outer surface of the bite is pressed to the shaft core side, The cutting tool presses the pipe surface with a uniform force to cut the pipe surface uniformly. Further, by providing a rotary drive device for rotatably holding the rotating body at the end of the grip portion of the rotating body, the work can be easily performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are cross-sectional views of the first embodiment of the present invention mounted on a resin pipe 1 showing a state before cutting and a state after cutting. The main components are a core member 20, a rotary body 30 inserted into the core member 20, and a cutting tool 40 fixed to the main body 30.
Consists of. The core member 20 has a substantially cylindrical shape, and has a main body 3 on the inner surface.
An internal step portion 27 is provided between the female screw 21 and the parallel inner peripheral surface 22 which are 0 guide portions. Moreover, a resin pipe 1 is provided on the outer peripheral surface.
The insertion portion 23 and the large diameter portion 24 to be inserted into the inner surface of the end of the resin pipe 1 and the outer stepped portion 25 on which the end surface 51 of the resin pipe 1 abuts are provided. The insertion portion 23 has substantially the same inner diameter dimension as the resin pipe 1, and a tapered outer peripheral surface which is slightly larger than the inner diameter of the resin pipe 1 in the vicinity of the step 25 is provided so as to be securely fixed to the resin pipe 1. The large diameter portion 24 is dimensioned to fit on the inner peripheral surface of the main body 30.
An O-ring 26 is attached to the main body 30 to prevent dust such as cutting chips from entering the main body 30.

The rotating body 30 has a central shaft 32 formed by connecting a metallic shaft member 32 'to the shaft center side of the cap-shaped grip portion 31, and the central shaft 32 is a female screw 2 for guiding the core member.
1 has a parallel shaft portion 33 to be inserted therein and a parallel shaft portion 34 to be inserted into the parallel inner surface 22 of the core member.
A locking member 35 that slides on the core member 2 is provided so as to be locked to the inner stepped portion 27 of the core member to prevent the central shaft 32 of the main body from falling off from the internal thread 21 of the core member. Since the locking member 35 slides on the parallel inner surface 22, the central shaft screwed with the female screw 21 is held at a distance on the axial line, and is stably held with the shaft core of the core member for smooth guiding. Screwing is performed. A ratchet hole 36 is provided on the outer peripheral surface of the parallel shaft portion 33 that is inserted into the female screw 21, and a coil spring 37 and a pawl 38 that is screwed into the female screw 21 are attached to the hole 36, and the pawl 38 is formed.
The male screw 21 is elastically screwed to form a ratchet type screw portion.

FIG. 3 shows byte 40 and FIG. 4 shows byte 4.
0 of FIG. 1 showing a state in which 0 is fixed to the opening side of the grip portion.
FIG. The bite 40 is fixed to the opening end of the grip 32 by inserting a screw 41 into the loose hole 42 in the center from the opening side of the grip 32, and is attached to the loose core 42 so as to be movable toward the shaft core side. is there. Reference numeral 43 is a chamfered portion for guiding the resin tube 1 so that the resin tube 1 can be easily inserted. Reference numeral 44 denotes a cutting edge for cutting the outer peripheral surface of the resin pipe 1, and a step 46 is provided from the contact surface 45 corresponding to the required cutting depth.
The distance of the step 46 is usually 0.1 to 0.3 mm.
The cap-shaped grip portion 32 of the rotary body 30 is made of metal, plastic, or the like, and a circumferential protrusion 48 is provided at the opening-side end. A steel annular spring 47 having a notch is attached, and the inner peripheral surface of the annular spring 47 contacts the outer surface of the cutting tool 40.
0 is pressed to the shaft core side. Therefore, the cutting tool 40 presses the outer surface of the resin pipe 1 with a constant pressing force to perform cutting. Further, a square hole 39 is provided on the end side of the main body 30 to auxiliary form a connecting portion for a power tool or the like.

Next, a procedure for cutting the outer surface of the end of the resin pipe 1 will be described. First, as shown in FIG. 1, the main body 30 is pressed against the core member 20 so that the claw 38 of the central shaft 32 is screwed into the internal thread 21 of the core member. This can be done with one touch by pushing the main body 30 in the axial direction without rotating the main body 30 so that the pawl 38 of the ratchet type screwing portion is disengaged from the female screw 21. Next, the insertion portion 23 of the core member 20 is inserted into the end portion of the resin pipe 1, and the grip portion 31 is inserted until the end portion of the resin pipe 1 hits the outer step portion 25. At this time, the chamfered portion 43 of the cutting tool 40 is pushed up by the outer surface of the resin tube 1 to insert the resin tube 1, and the core member 20 is inserted and fixed to the inner surface of the resin tube 1. Next, when the hand grip 31 is rotated by hand, the female screw 21 of the core member 20 and the ratchet-type screwing portion claw 38 provided on the parallel shaft 33 inserted into the female screw inner surface of the main body are screwed together. The cutting tool 40 spirally retracts around the pipe 1, and the cutting edge 44 of the cutting tool 40 cuts the surface of the pipe 1. The rotation of the grip 31 is controlled by the central shaft 3
The locking member 35 provided at the end of No. 2 is carried out until it abuts against the inner surface side step portion 27 of the core member 20, and at this position, the cutting tool 40.
The cutting edge 44 reaches the end face of the resin pipe 1. This state is shown in Figure 2.
Shown in. After that, the core member 20 is removed from the pipe end, and the cutting work of the pipe surface is completed.

Although the main body 30 is located away from the core member 20 when the cutting is completed, when cutting the next resin pipe,
The main body 30 for inserting the core member 20 into the end of the resin pipe
Is pushed toward the resin pipe, the pawl 38 of the ratchet type screwing portion is disengaged from the female screw 21 and is axially advanced to the back of the female screw 21 with one touch, and the core member 20 is moved to the inner wall of the main body 30 or the inner side of the core member. The core member 20 is pushed against the step portion 27, and the core member can be inserted into the inner surface of the end portion of the resin pipe 1. By providing the ratchet type screwing portion that is screwed with the female screw 21 of the core member in this way, the troublesome work of returning the main body 30 to the initial state by rotating the body 30 in the opposite direction to the cutting can be omitted, and the initial state can be set with one touch. You can move. In the above cutting work procedure, the method of cutting from the base portion side to the end portion side of the resin pipe 1 has been described, but conversely, the resin pipe 1 is cut from the end portion side to the base portion side. However, the work can be done with one touch just like the above.

Although a part of the cutting chips during the cutting process penetrates into the inner surface of the grip portion 31, the O-ring 26 prevents the cutting chips from entering the inner depth. Further, even if the cutting chips penetrate to the inside without the O-ring 26 attached, the core member 2
The guide screw between 0 and the main body 30 is the screw 21 because it is provided on the core member side, and the parallel shaft portion 33 of the central shaft 32 is inserted into this female screw 21 so that the threaded portion of the female screw 21 is cut. The powder does not enter, and the internal thread 21 and the pawl 38 of the ratchet mechanism are smoothly screwed together. In the above embodiment, the guide screw 21 of the core member 20 and the ratchet type screwing portion of the main body central shaft 32 are provided outside the end of the resin pipe 1, so that the resin pipe 1 has a small diameter. The internal thread 21 of the core member can be enlarged to provide the ratchet type threaded portion in the parallel shaft 33. If the resin pipe 1 to be cut has a large diameter, the guide female screw 21 of the core 20 and the ratchet type screwing portion can be provided at the inner surface side position of the resin pipe 1.

FIG. 5 shows a second embodiment of the present invention.
The scraper for pipe surface cutting of the above-mentioned embodiment is provided with a drive device to automate the rotation of the grip portion 32. A DC motor 81 and a speed reducer 82 are housed in the case 80, and the output shaft 83 is fitted in the square hole 39 of the main body grip 32. The case 80 and the main body 30 are fixed to each other by the grip portion 32.
Between the inner peripheral surface of the mounting cylinder 84 extending so as to cover the outer peripheral surface thereof, and the bearing 85 is mounted between the inner peripheral surface and the grip portion 31 of the rotating body main body so as to be rotatably fixed. Motor 8
The power source 1 is a DC 12 or DC 24 volt power source attached to a controller power source that cuts the resin pipe 1 with the present apparatus and then performs electric fusion connection. Reference numeral 86 denotes a switch for the motor 81, which is inserted into the resin pipe 1 while holding the handle 87 of the case 80. When the switch 86 is turned on, the motor 81 is driven to perform the cutting work. When the cutting work is completed, the switch 86 is automatically operated. Is cut off.

[0017]

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. In particular, the mechanism for pressing the cutting tool against the surface of the resin pipe is simple, and the tool is pressed against the surface of the resin pipe with a uniform force for cutting. Further, there is no fear that dust such as cutting chips will adhere to the guide screwing portion of the cutting work, and a smooth feed rotation can be obtained. Therefore, the surface of the resin pipe can be easily and safely cut uniformly, and the work is easy. In addition, it has a compact size and is easy to handle.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view after cutting attached to a resin pipe showing a first embodiment of the present invention.

FIG. 3 is a perspective view showing a cutting tool 40.

FIG. 4 is a cross-sectional view taken along the line AA showing a mounting portion of a cutting tool 40.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional technique.

FIG. 7 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Resin tube 20 Core member 21 Guide internal thread 22 Parallel inner peripheral surface 23 Insertion portion 24 Large diameter portion 25 Outer step portion 26 O-ring 27 Inner step portion 30 Rotating member body 31 Grip portion 32 Central shaft 32 'Metal shaft Member 33 Parallel shaft part to be inserted into the inner surface of female screw 34 Parallel shaft part to be inserted into the parallel inner surface 35 Locking member 36 Ratchet hole 37 Coil spring 38 Claw 39 Square hole 40 Bit 41 Screw 42 Loose hole 43 Chamfering part 44 Cutting edge 45 Contact surface 46 Step 47 Ring spring 48 Body ring-shaped projection 80 Case 81 Motor 82 Speed reducer 83 Drive unit output shaft 84 Mounting tube 85 Bearing 86 Switch 87 Handle

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Claims (3)

(57) [Claims] 1. A cylindrical core member having an outer peripheral surface which is inserted into an inner surface of an end portion of a resin pipe and is locked to the inner surface of the resin pipe, and a female thread for guiding the inner surface, and a female thread of the core member. A shaft to be inserted into the inner surface, and a ratchet type screwing portion which is provided on a part of the shaft and is usually screwed to the female screw and is forcibly pressed against the female screw so as to be disengaged from the screw with the female screw. A rotary body having a cap-shaped grip that covers the end of the resin pipe that is inserted into the core member from the end side of the shaft, and is provided on the opening side of the cap-shaped grip of the rotary body and external to the core member. And a cutting device for cutting the outer peripheral surface of the inserted resin pipe, wherein O is provided between the outer peripheral surface of the core member and the inner peripheral surface of the rotating body.
A scraper for pipe surface cutting, wherein a ring is mounted, and the O-ring slides on the inner peripheral surface of the rotating body. 2. The cutting device includes an opening side end of the rotating body.
A circular protrusion is provided on the outer peripheral portion, and a substantially annular spring member having a slit on the circumference is attached to the outer periphery of the circular protrusion , and the resin pipe is in contact with the inner peripheral surface of the spring member. The scraper for pipe surface cutting according to claim 1, characterized in that it comprises a bite pressed against the surface of the pipe. 3. A rotary drive unit for rotating a rotary body is provided on the end side of the cap-shaped grip, and the rotary drive unit is rotatably held by the grip outer peripheral surface of the rotary body. The scraper for pipe surface cutting according to claim 1 or 2.