JP6471189B2 - Scraper equipment - Google Patents

Description

  The present invention relates to a scraper device used for cutting an outer peripheral surface of a tubular end portion of a pipe member or a joint member used as a gas pipe or a water pipe.

For gas pipes and water pipes, pipes and joints made of resin such as polyethylene are used instead of conventional metal pipes.
In particular, in the case of resin pipes, when connecting to other pipes or joints at the construction site, the outer peripheral surface of the tubular end of one pipe is shaved with a scraper device and fitted into the other tubular end to electrically conduct electricity. Are fused and connected.
For this reason, it is desirable that the outer peripheral surface of the tubular end portion after being machined on site by the scraper device is as smooth as possible. If the outer peripheral surface of the tubular end portion after shaving has irregularities, unevenness occurs in the distance from the inner surface of the other tubular end portion, resulting in unevenness in energization or melting. There is a possibility that a part that is not fused with sufficient strength is generated or a part that cannot be provided with sufficient durability is generated.

Japanese Patent Laid-Open No. 09-207001

  By the way, in a scraper apparatus, the blade part applied to the outer peripheral surface of the tubular end part of a resin pipe or joint member is attached to the tip of the L-shaped arm. Then, the fixing portion is inserted and fixed to the tubular end portion, and the shaft and the L-shaped arm protruding from the fixing portion are rotationally driven by a handle or an electric tool. As a result, the blade portion is rotated a plurality of times around the axis of the tubular end portion, and the outer peripheral surface is cut into a spiral shape. By rotating a plurality of times, the outer peripheral surface of the tubular end portion can be shaved within a certain range. And after a process, a blade part is removed from an outer peripheral surface by pulling out an L-shaped arm, for example.

  However, when the blade portion is removed from the outer peripheral surface by simply pulling out the L-shaped arm in this way, the upper surface is scraped with the blade portion in contact with the processed outer peripheral surface. As a result, the outer peripheral surface after shaving is scratched. In addition, there is a possibility that unevenness in energization or unevenness of melting may occur due to this single scratch.

  Therefore, in Patent Document 1, a long lever is rotatably supported with respect to the main body of the scraper device, and a cutter functioning as a blade portion is fixed to the tip of the long lever. Then, after cutting, the lever is pushed so that the cutter can be separated from the outer peripheral surface of the tubular end portion. As a result, the cutter can be removed from the outer peripheral surface without damaging the processed outer peripheral surface.

  However, when the blade portion is fixed to the tip of a long lever that is rotatably supported with respect to the main body of the scraper device as in Patent Document 1, the tubular end portion is bent or the outer peripheral surface of the tubular end portion is uneven. When the blade is pushed by dirt, the long lever swings. And if a long lever rock | fluctuates, the attitude | position of the blade part with respect to the outer peripheral surface of a tubular edge part will incline. If the posture of the blade portion with respect to the outer peripheral surface of the tubular end portion is inclined, the outer peripheral surface cannot be cut with a uniform thickness over the entire width of the blade edge. In addition, the axial width of the outer peripheral surface that can be cut at once by the inclined blade portion is shorter than that when the blade is not inclined. As a result, a slight uncut residue is likely to occur between the shaving portion in the previous rotation and the shaving portion in the current rotation. Due to these situations, the smoothness of the outer peripheral surface of the tubular end portion after shaving is deteriorated.

  Further, the scraper device of Patent Document 1 is considered to be originally used for processing a tubular end portion having a single tube diameter, but is temporarily used for processing a tubular end portion having a different relationship. In this case, the outer peripheral surface of any of these pipe diameters is cut with the long lever inclined with respect to the axial direction of the tubular end portion. In this case, the blade portion always hits in an inclined posture with respect to the outer peripheral surface of the tubular end portion, and unevenness due to the inclined blade portion is formed on the processed outer peripheral surface formed by a plurality of feed rotations. Will be formed.

  Thus, in the scraper device, it is required that the outer peripheral surface after processing is not damaged without impairing the smoothness of the outer peripheral surface after processing.

The scraper device according to the present invention applies a blade tip to the outer peripheral surface of the tubular end portion of a resin pipe or joint member, and rotates and feeds the outer peripheral surface of the tubular end portion around the axis of the tubular end portion. A scraper device that cuts into a spiral shape, a fixed portion that is inserted into and fixed to the tubular end portion, a shaft that engages with the fixed portion and protrudes from the fixed portion, and a short side that engages with the shaft And an L-shaped arm having a long side extending from the short side along the shaft and provided so as to be able to rotate around the fixed part, and holding the blade tip, the L-shaped A tip holder that is movably accommodated in a holder accommodating portion formed at a tip of the long side portion of the mold arm in a direction in which the blade tip comes in contact with and separates from an outer peripheral surface of the tubular end portion; Tubular end A holder elastic member that urges the tip holder toward the outer peripheral surface of the tubular end so as to be pressed against the peripheral surface, and an operation that is attached to the L-shaped arm and resists the urging force of the holder elastic member Or an operation member that retracts the tip holder so that the blade tip can be separated from the outer peripheral surface of the tubular end portion by an operation of releasing an urging force, and the operation member is connected to the short side portion. And an operation lever rotatably provided on the long side portion forming the L-shaped arm , and one end portion of the operation lever is pushed toward the long side portion of the L-shaped arm. the chip holder rotates by the blade tip retracts to allow spaced from the outer peripheral surface of the tubular end portion.

  Preferably, a rotation mechanism that is provided at an engagement portion between the fixed portion and the shaft and enables the L-shaped arm to be rotated around the fixed portion. The short side portion engaged with the shaft is provided with a plurality of shaft fixing positions for fixing the shaft along the longitudinal direction, and is selected according to the tube diameter of the tubular end portion to be processed. The shaft may be fixed at the shaft fixing position.

  Preferably, the outer peripheral surface of the shaft is formed with a screw groove that meshes with screw teeth of a half nut used in the rotating mechanism, and the rotating mechanism is configured so that the half nut is attached to the outer peripheral surface of the shaft together with the half nut. A nut elastic member that presses against and engages the screw teeth and the screw groove, and is operated against the urging force of the nut elastic member to move the half nut to move the screw of the rotating mechanism It is good to have a release member which cancels meshing of a tooth and the screw thread of the shaft.

  Preferably, the blade tip is formed by a step formed between a tip guide surface that hits an outer peripheral surface of the tubular end portion during the cutting process and a tip guide surface that protrudes from the tip guide surface. And a blade part that cuts the outer peripheral surface of the part, and the chip guide surface is preferably attached to the chip holder in a state in which the chip guide surface is on the front side in the feed direction from the blade part.

  Preferably, the tip holder has a holder guide surface that abuts on the outer peripheral surface of the tubular end portion during the cutting process, and the blade tip protrudes from the holder guide surface and is interposed between the holder guide surface and the holder guide surface. It is good to have a blade part which sharpens the outer peripheral surface of the tubular end by the level difference formed, and to be attached to the chip holder in the state where the holder guide surface becomes the feed direction front side from the blade part.

  Preferably, it has the holder guide surface and the chip guide surface, and the blade tip can be attached to the chip holder so that the holder guide surface and the chip guide surface are flush with each other. .

  In the present invention, the tip holder for holding the blade tip is accommodated in a holder accommodating portion formed at the tip of the long side portion of the L-shaped arm so as to be movable in the direction of coming into contact with and away from the outer peripheral surface of the tubular end portion, By operating the operating member attached to the L-shaped arm, the operating member is retracted away from the outer peripheral surface of the tubular end portion. The L-shaped arm itself is provided so as to be rotatable with respect to a fixed portion inserted into the tubular end portion and fixed or a shaft protruding from the fixed portion.

  Therefore, the L-shaped arm does not need to be movably provided in the radial direction of the tubular end portion with respect to the fixed portion or the shaft protruding from the fixed portion in order to separate the blade tip from the outer peripheral surface of the tubular end portion. As a result, the blade tip swung due to the bending of the tubular end portion or the irregularities or dirt on the outer peripheral surface of the tubular end portion does not tilt with respect to the outer peripheral surface of the tubular end portion during the shaving process. The deterioration of the smoothness of the outer peripheral surface after processing due to the inclination of the blade tip with respect to the outer peripheral surface of the tubular end portion can be suppressed. In particular, even when, for example, the scraper device is downsized or adapted to a plurality of tube diameters, the blade tip can always hit the outer peripheral surface of the tubular end portion in a substantially constant posture, and the outer peripheral surface of the tubular end portion can always be contacted. It can be processed with high smoothness.

  Moreover, after the processing, the blade tip can be separated from the outer peripheral surface of the tubular end by operating the operating member to retract the tip holder. Then, the L-shaped arm is pulled in the axial direction of the shaft in the separated state, and the outer peripheral surface of the processed tubular end portion can be removed without being damaged by the blade tip.

FIG. 1 is a perspective view of a scraper device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the scraper device of FIG. 3 is an exploded perspective view of the blade chip and the chip holder of FIG. FIG. 4 is an explanatory view of a holding structure and a movable structure of the chip holder by the long side portion of the L-shaped arm of FIG. FIG. 5 is an explanatory diagram of how to attach the tubular material to the tubular end of the scraper device of FIG. 1. FIG. 6 is an explanatory diagram of the cutting of the outer peripheral surface of the tubular end portion by the scraper device of FIG. FIG. 7 is an explanatory diagram of a blade tip retracting method in the scraper device of FIG. FIG. 8 is an explanatory view of a method of removing the scraper device of FIG. 1 from the tubular end portion of the pipe material. FIG. 9 is an explanatory view of a holding structure and a movable structure of a chip holder according to a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a scraper device 1 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the scraper device 1 of FIG.
The scraper device 1 is a tool for cutting an outer peripheral surface 100S of a tubular end portion of a polyethylene pipe material or a joint member used as a gas pipe or a water pipe for electric fusion.
As shown in FIGS. 1 and 2, the scraper device 1 includes a fixed portion 2, a shaft 3, an L-shaped arm 4, a tip holder 5, and a blade tip 6.

The fixing portion 2 is a portion that is inserted into and fixed to the tubular end portion 100 of the scraper device 1.
The fixed portion 2 includes a cylindrical fixed sleeve 11, a fixed leg portion 12, a movable leg portion 13, a plurality of chuck plates 14, a handle 17, and a rotation mechanism 20.
The fixed leg portion 12 is fixed to one end of the cylindrical fixed sleeve 11 in the rotational feed direction.
The fixed sleeve 11 is loosely inserted into the center hole of the movable leg 13.

The chuck plate 14 is a plate material bent at a curvature corresponding to the inner diameter of the tubular end 100 to be processed. On the curved outer peripheral surface 100 </ b> S of the chuck plate 14, a flange portion 15 that hits the end surface of the tubular end portion 100 protrudes.
The plurality of chuck plates 14 are movably coupled to the fixed leg portion 12 and the movable leg portion 13 using a plurality of links 16. As the movable leg 13 moves in the axial direction of the fixed sleeve 11, the distance from the fixed sleeve 11 to the pressing plate changes. The plurality of chuck plates 14 move like a pantograph. The distances from the fixed sleeve 11 to the plurality of chuck plates 14 can be adjusted to correspond to the plurality of pipe diameters to be processed.

  The handle 17 has a substantially flat plate portion, and the fixing sleeve 11 is inserted into the center hole of the flat plate portion. A screw structure (not shown) is formed in the center hole of the handle 17 and the outer peripheral surface 100S of the fixing sleeve 11 and meshes with each other. The handle 17 can move in the axial direction of the fixed sleeve 11 by rotating around the fixed sleeve 11. As a result, the position of the movable leg 13 in the axial direction of the fixed sleeve 11 can be adjusted against the spring force of the fixed spring 18 provided between the fixed leg 12 and the movable leg 13. That is, the outer periphery size by the plurality of chuck plates 14 that can move like a pantograph can be adjusted. The fixing sleeve 11 of the fixing part 2 can be mounted coaxially with respect to the pipe material to be processed.

The rotating mechanism 20 includes a mechanism main body 21, a half nut 24, and a nut spring 25. The rotation mechanism 20 is provided with a release button 26.
The mechanism main body 21 is fixed to the cylindrical fixing sleeve 11. The mechanism body 21 is formed with a communication hole 22 that communicates linearly with the inside of the fixed sleeve 11.
An operation hole 23 is formed in the mechanism main body 21 from a direction orthogonal to the communication hole 22. A nut spring 25, a half nut 24, and a release button 26 are accommodated in the operation hole 23. The head of the release button 26 protrudes outward from the mechanism body 21. By pressing the release button 26 against the urging force of the nut spring 25, the half nut 24 moves in the operation hole 23.

The shaft 3 has a substantially cylindrical bar shape, and a shank portion for attaching a handle portion or a chuck portion of an electric tool (not shown) is provided at a rear end portion thereof. The shaft 3 is inserted into the communication hole 22 of the mechanism main body 21 of the rotating mechanism 20 from the tip thereof. The shaft 3 is inserted into the mechanism main body 21 and the fixed sleeve 11.
Further, on the outer peripheral surface of the shaft 3, a thread groove is formed in the mechanism main body 21 to be engaged with a screw tooth (not shown) of the half nut 24. Further, on the inner peripheral surface of the long hole of the half nut 24, screw teeth are formed only on the portion that is pressed against the outer peripheral surface of the shaft 3 by the urging force of the nut spring 25.
Usually, the shaft 3 meshes with the half nut 24. In this state, the shaft 3 is sent in the axial direction by being rotationally driven. Rotational feed is realized. Moreover, when it reversely rotates, it is rotated and sent in the reverse direction.
When the release button 26 is pressed, the engagement between the shaft 3 and the half nut 24 is released. In this state, the shaft 3 can freely move in the axial direction.
Thus, the shaft 3 protrudes from the fixed portion 2 so as to be rotatable along the axial direction of the fixed sleeve 11 of the fixed portion 2.

  The L-shaped arm 4 is configured such that a short side portion 31 that engages with the shaft 3 and a long side portion 35 that extends along the shaft 3 are connected in a substantially L shape.

A shaft long hole 32 is formed in the short side portion 31 along the longitudinal direction thereof. The shaft 3 is inserted into the shaft long hole 32 so that the shank portion protrudes rearward.
A plurality of knob holes 33 are formed along the longitudinal direction of the short side portion 31. The plurality of knob holes 33 are formed at positions corresponding to a plurality of pipe diameters to be processed. Then, a knob screw 34 is inserted from the knob hole 33 corresponding to the pipe diameter of one pipe material to be processed, and screwed to the shaft 3.
Thereby, the L-shaped arm 4 is fixed to the shaft 3.

  The long side portion 35 of the L-shaped arm 4 can be rotated around the fixed portion 2 by an arc track corresponding to the radius of the pipe material to be processed. The L-shaped arm 4 can be rotated and fed around the fixed sleeve 11 together with the shaft 3.

FIG. 3 is an exploded perspective view of the blade tip 6 and the tip holder 5 of FIG.
FIG. 4 is an explanatory diagram of a holding structure and a movable structure of the chip holder 5 by the long side portion 35 of the L-shaped arm 4 of FIG.
The chip holder 5 includes a holder main body 41, a flange portion 42, and a pair of holder pins 43.

The holder body 41 has a substantially quadrangular prism shape.
The flange portion 42 protrudes outward from the upper end of the holder body 41 having a substantially quadrangular prism shape.
The pair of holder pins 43 project vertically from a pair of opposed surfaces of the holder body 41 having a substantially quadrangular prism shape.
Then, the blade chip 6 is screwed to the lower end portion of the substantially quadrangular prism-shaped holder main body 41 so as to protrude from the lower surface.
The lower flat surface of the holder body 41 protrudes from the blade tip 6 in the feed direction and functions as a holder guide surface 44.
Further, a large inclined surface 45 is formed by chamfering in the feed direction of the holder guide surface 44. The end surface of the tubular end portion 100 can be guided to the holder guide surface 44 by hitting the inclined surface 45.

The blade tip 6 has a substantially rhomboid plate shape. And the tip guide surface 51 and the blade part 52 are formed in the upper side and the lower side.
The tip guide surface 51 is a flat surface.
The blade part 52 is a part for cutting the outer peripheral surface 100S of the tubular end part.
The blade portion 52 protrudes from the tip guide surface 51 and forms a step between the tip guide surface 51. This step corresponds to the shaving thickness of the outer peripheral surface 100S.
By forming the tip guide surface 51 together with the blade portion 52 in the blade tip 6 in this way, the outer peripheral surface 100S of the tubular end portion can be shaved with a desired thickness due to a step.
Further, the substantially diamond-shaped blade tip 6 can be used twice by exchanging the blade portion 52 by attaching the tip portion 5 to the tip holder 5 by replacing the upper side and the lower side.
In the state where the blade tip 6 is attached to the tip holder 5, as shown in FIG. 4, the tip guide surface 51 and the holder guide surface 44 are provided flush with each other on the front side in the feed direction of the blade portion 52.
The chip guide surface 51 and the holder guide surface 44 abut against the outer peripheral surface 100S of the tubular end portion during the cutting process. Thereby, how the blade part 52 hits the outer peripheral surface 100S can be stabilized.

As shown in FIG. 2, a holder accommodating portion 36 is formed at the distal end portion of the long side portion 35 of the L-shaped arm 4.
The holder accommodating portion 36 is formed in a substantially quadrangular prism shape so as to extend along the same direction as the longitudinal direction of the short side portion 31 of the L-shaped arm 4.
In the holder accommodating portion 36, the holder main body 41 and the flange portion 42 of the chip holder 5 are accommodated together with the holder spring 37. The holder spring 37 is compressed between the chip holder 5 and the holder cover 39 in the holder accommodating portion 36.
Due to the urging force of the holder spring 37, the lower end portion of the holder main body 41 and the blade tip 6 protrude outward from the holder accommodating portion 36. The holder spring 37 biases the tip holder 5 so that the blade tip 6 is pressed against the outer peripheral surface 100S of the tubular end portion.
Further, the pair of holder pins 43 for the chip holder 5 protrudes outwardly from a pair of pin long holes 38 formed along the movable direction of the chip holder 5 on the side surface of the long side portion 35.
Thereby, as shown in FIG. 5 or FIG. 6 described later, the holder accommodating portion 36 extends in a direction toward the fixing portion 2. The holder main body 41 and the flange portion 42 of the chip holder 5 are accommodated so as to be movable along a direction perpendicular to the axes of the shaft 3 and the fixed portion 2. The tip holder 5 is accommodated so as to be movable in the direction in which the blade tip 6 comes in contact with and separates from the outer peripheral surface 100S of the tubular end portion.

An operation lever 61 is rotatably attached to the long side portion 35 of the L-shaped arm 4 on the same plane as the pin long hole 38. The holder pin 43 is loosely fitted in the hole at the other end in a state where one end of the operation lever 61 is separated from the L-shaped long side portion 35. Therefore, it is possible to raise the holder pin 43 one end portion pivoted Ri by the pressing toward the long side portion 35, along the pin slot 38 of the operating lever 61. As a result, the tip holder 5 and the blade tip 6 can be retracted against the urging force of the holder spring 37. The tip holder 5 and the blade tip 6 can be separated from the outer peripheral surface 100S of the tubular end portion.

  Next, the cutting process of the outer peripheral surface 100S of the tubular end portion using the scraper device 1 having the above-described structure will be described.

  FIG. 5 is an explanatory diagram of how to attach the tubular material to the tubular end portion 100 for the scraper device 1 of FIG. 1.

As shown in FIG. 5, the plurality of chuck plates 14 of the scraper device 1 are inserted into the tubular end 100 to be processed (operation M01).
Then, the handle 17 is turned (operation M02). Thereby, the plurality of chuck plates 14 are fixed to the inside of the tubular end portion 100 in a state where the collar portions 15 abut against the end face of the tubular end portion 100.
Further, the L-shaped arm 4 is attached to the shaft 3 (operation M03). At this time, the shaft 3 is inserted into the shaft long hole 32 of the L-shaped arm 4 so that the shank portion protrudes, and the attachment position in the long hole direction is adjusted to a position corresponding to the tube diameter of the tubular end portion 100. The Further, the knob screw 34 is inserted into the knob hole 33 selected from the plurality of knob holes 33 according to the tube diameter of the tubular end portion 100. By tightening with the knob screw 34, the shaft 3 is screwed and fixed to the L-shaped arm 4 at a position corresponding to the tube diameter of the tubular end portion 100.
Thereafter, the release button 26 is pressed (operation M04-1), and the shaft 3 is pushed into the fixed portion 2 (operation M04-2).
Then, while further operating the operation lever 61 (operation M04-3), the shaft 3 is pushed in, and as shown in an enlarged view in FIG. 3, the holder guide surface of the tip holder 5 attached to the tip of the L-shaped arm 4 The shaft 3 is positioned so that 44 and the tip guide surface 51 are pressed against the outer peripheral surface 100S of the tubular end portion. When the release button 26 is released, the half nut 24 of the rotation mechanism 20 and the shaft 3 are engaged with each other.

  FIG. 6 is an explanatory diagram of the cutting of the outer peripheral surface 100S of the tubular end portion by the scraper device 1 of FIG.

When machining, a handle or a power tool is attached to the shank portion at the rear end of the shaft 3.
Then, the shaft 3 is rotated (operation M05-1). As a result, the shaft 3 advances in the feed direction while rotating (operation M05-2).
The L-shaped arm 4 is also rotated together with the shaft 3, and the tip holder 5 and the blade tip 6 have the blade portion 52 with the holder guide surface 44 and the tip guide surface 51 being in pressure contact with the outer peripheral surface 100S of the tubular end portion. The outer peripheral surface 100S is shaved.
The blade part 52 advances while rotating on the outer peripheral surface 100S.
The blade portion 52 is rotationally fed a plurality of times around the axis of the tubular end portion 100, so that the surface of the outer peripheral surface 100S is cut in a spiral shape along the axial direction.
The outer peripheral surface 100S of the tubular end portion is shaved in a predetermined range from the tube end.

  FIG. 7 is an explanatory diagram of a method for retracting the blade tip 6 in the scraper device 1 of FIG.

When the cutting process is finished, the blade part 52 is removed from the outer peripheral surface 100S of the processed tubular end part.
Specifically, the operation lever 61 is operated (operation M06-1), and the blade portion 52 is separated from the outer peripheral surface 100S of the processed tubular end portion.
In this state, the release button 26 is pressed (operation M06-2), and the shaft 3 or the L-shaped arm 4 is pulled backward (operation M06-3).
Accordingly, the shaft 3 moves rearward in the axial direction, and the blade portion 52 can move rearward from the end surface of the processed tubular end portion 100.

FIG. 8 is an explanatory view of a method of removing the scraper device 1 of FIG. 1 from the tubular end portion 100 of the pipe material.
In a state where the blade portion 52 has moved rearward from the end face of the tubular end portion 100, the handle 17 is turned in the reverse direction (operation M07).
As a result, the plurality of chuck plates 14 are separated from the inside of the tubular end portion 100.
Then, the plurality of chuck plates 14 of the scraper device 1 are pulled out from the tubular end portion 100 (operation M08).

As described above, in the present embodiment, the outer peripheral surface 100S of the tubular end portion of the resin pipe material such as polyethylene and the joint used for the gas pipe and the water pipe can be machined.
Even if the tubular end portion 100 before processing is bent or the outer peripheral surface 100S is uneven or dirty, the blade portion 52 can hit the outer peripheral surface 100S being processed in a stable and constant posture. As a result, the outer peripheral surface 100S after being processed into a spiral shape by the blade portion 52 becomes smooth. It is possible to form the outer peripheral surface 100S without unevenness suitable for current welding.
Moreover, when the scraper device 1 is removed from the tubular end portion 100, the blade portion 52 can be lifted and removed from the outer peripheral surface 100S. There will be no scratches caused by rubbing the blade 52 against the outer peripheral surface 100S after processing.
As a result, the processed outer peripheral surface 100S is processed into a high smoothness surface without scratches. The entire outer peripheral surface 100S can be fused with sufficient strength without unevenness, and can have sufficient durability.
Moreover, such an effect can be acquired about the tubular end part 100 of a some pipe diameter. A surface having an equally high smoothness can be processed with respect to the outer peripheral surface 100S of the tubular end portions having a plurality of tube diameters.
Thus, in the scraper device 1, the processed outer peripheral surface 100S can be prevented from being damaged without impairing the smoothness of the processed outer peripheral surface 100S.

In other words, in the present embodiment, the tip holder 5 that holds the blade tip 6 is substantially perpendicular to the outer peripheral surface 100S of the tubular end portion in the holder accommodating portion 36 formed at the tip of the long side portion 35 of the L-shaped arm 4. By operating an operating member that is movably accommodated in any direction and is attached to the L-shaped arm 4, it is retracted away from the outer peripheral surface 100 </ b> S of the tubular end portion. The L-shaped arm 4 itself is provided so as to be rotatable with respect to the fixed portion 2 that is inserted and fixed in the tubular end portion 100 or the shaft 3 that protrudes from the fixed portion 2.
Therefore, the L-shaped arm 4 is movable in the radial direction of the tubular end portion 100 with respect to the fixed portion 2 or the shaft 3 protruding from the fixed portion 2 in order to separate the blade tip 6 from the outer peripheral surface 100S of the tubular end portion. It is not necessary to provide it. As a result, the blade tip 6 oscillated due to the bending of the tubular end portion 100 and the unevenness or dirt on the outer peripheral surface 100S of the tubular end portion is inclined with respect to the outer peripheral surface 100S of the tubular end portion during the shaving process. There is no. The deterioration of the smoothness of the outer peripheral surface 100S after processing due to the inclination of the blade tip 6 with respect to the outer peripheral surface 100S of the tubular end portion can be suppressed. In particular, for example, even when the scraper device 1 is downsized or adapted to a plurality of tube diameters, the blade tip 6 can always contact the outer peripheral surface 100S of the tubular end portion in a substantially constant posture, and the outer periphery of the tubular end portion The surface 100S can always be processed with high smoothness.
In addition, after processing, the blade tip 6 can be separated from the outer peripheral surface 100S of the tubular end by operating the operating member to retract the tip holder 5. Then, the L-shaped arm 4 can be pulled in the axial direction of the shaft 3 in the separated state, and the outer peripheral surface 100S of the processed tubular end can be removed without being damaged by the blade tip 6.

  Further, in the present embodiment, the tip holder 5 has a holder pin 43 that protrudes outward from a long hole formed along a direction in which the long side portion 35 of the L-shaped arm 4 contacts and separates, and an operation lever 61. Is rotatably supported on the surface of the long side portion 35 in which the long hole is formed. Therefore, by operating one end of the operation lever 61 and moving the holder pin 43 along the long hole at the other end of the operation lever 61, the blade tip 6 can be separated from the outer peripheral surface 100S of the tubular end portion.

  In the present embodiment, a rotating mechanism 20 that enables the L-shaped arm 4 to be rotated and fed around the fixed portion 2 is provided at the engaging portion between the fixed portion 2 and the shaft 3. Therefore, a plurality of shaft 3 fixing positions can be set in the short side portion 31 of the L-shaped arm 4 engaged with the shaft 3 along the longitudinal direction. Further, the shaft 3 can be fixed at one shaft 3 fixing position selected according to the tube diameter of the tubular end 100 to be processed. Thereby, it can grind about the outer peripheral surface 100S of the tubular end part of a some pipe diameter. In addition, since the distance between the outer peripheral surface 100S of the tubular end portions having a plurality of tube diameters and the long side portion 35 of the L-shaped arm 4 can be kept within a certain range, the blades can be disposed on the outer peripheral surface 100S of the tubular end portion. The chip 6 can be applied with a substantially constant pressure. As a result, the shaving thickness of the outer peripheral surface 100S can be stabilized within a certain range regardless of the tube diameter of the tubular end portion 100.

  In the present embodiment, the rotation mechanism 20 has a half nut 24 having screw teeth meshing with the screw grooves on the outer peripheral surface of the shaft 3, and presses the half nut 24 against the outer peripheral surface of the shaft 3 to bite the screw teeth and the screw grooves. And a nut spring 25 to be matched. Then, by operating the release button 26 against the urging force of the nut spring 25, the half nut 24 can be moved to release the engagement between the screw teeth of the rotating mechanism 20 and the screw groove of the shaft 3. . Therefore, the shaft 3 released from the engagement with the rotation mechanism 20 can be pulled in the axial direction of the shaft 3 together with the L-shaped arm 4. Thereby, the blade tip 6 can be removed from the outer peripheral surface 100S of the processed tubular end portion.

Further, in the present embodiment, the blade tip 6 is formed by a step formed between the tip guide surface 51 that hits the outer peripheral surface 100S of the tubular end portion at the time of cutting and the tip guide surface 51 protruding from the tip guide surface 51. And a blade portion 52 for cutting the outer peripheral surface 100S of the tubular end portion. The blade tip 6 is attached to the tip holder 5 in a state where the tip guide surface 51 is in front of the blade portion 52 in the feed direction. Therefore, the outer peripheral surface 100S can be cut by the blade portion 52 in a state where the tip guide surface 51 contacts the outer peripheral surface 100S of the tubular end portion. The shaving thickness at the outer peripheral surface 100S of the tubular end portion can be stabilized to a thickness corresponding to the step between the tip guide surface 51 and the tooth portion.
In particular, in this embodiment, the L-shaped arm 4 is provided so as not to move in the radial direction of the tubular end portion 100 with respect to the fixed portion 2 or the shaft 3 protruding from the fixed portion 2, and the outer peripheral surface 100S of the tubular end portion. On the other hand, since the blade tip 6 is pressed to a predetermined range with a stable urging force, the tip guide surface 51 can continue to hit the outer peripheral surface 100S of the tubular end portion in a stable posture. It is difficult to incline with respect to the outer peripheral surface 100S of the tubular end portion. As a result, the blade portion 52 can also stably scrape the outer peripheral surface 100S with a substantially constant thickness. The outer peripheral surface 100S after processing becomes a smooth surface that can be firmly and stably fused with another member by electric fusion. Since uniform fusion can be performed, high durability can be imparted to the connected portion after fusion.

  Moreover, in this embodiment, the chip holder 5 has the holder guide surface 44 which contacts the outer peripheral surface 100S of a tubular end part in the case of a cutting process. The blade tip 6 has a blade portion 52 that projects from the holder guide surface 44 and cuts the outer peripheral surface 100S of the tubular end portion by a step formed between the blade guide surface 44 and the holder guide surface 44. It is attached to the chip holder 5 in a state in which it is on the front side in the feed direction from the portion 52. Therefore, similarly to the case where the tip guide surface 51 is provided, the holder guide surface 44 of the tip holder 5 can continue to hit the outer peripheral surface 100S of the tubular end portion in a stable posture. It is difficult to incline with respect to the outer peripheral surface 100S of the tubular end portion. As a result, the blade portion 52 of the blade tip 6 can stably scrape the outer peripheral surface 100S with a substantially constant thickness. The outer peripheral surface 100S after processing becomes a smooth surface that can be firmly and stably fused with another member by electric fusion. Since uniform fusion can be performed, high durability can be imparted to the connected portion after fusion.

In this embodiment, both the holder guide surface 44 and the tip guide surface 51 are provided, and the blade tip 6 is attached to the tip holder 5 so that the holder guide surface 44 and the tip guide surface 51 are flush with each other. Can do. Thus, the blade tip 6 and the tip holder 5 can be kept in a stable posture against the outer peripheral surface 100S of the tubular end portion by the guide surfaces of both the holder guide surface 44 and the tip guide surface 51. It is difficult to incline with respect to the outer peripheral surface 100S of the tubular end portion. As a result, the blade portion 52 of the blade tip 6 can stably scrape the outer peripheral surface 100S with a substantially constant thickness. The outer peripheral surface 100S after processing becomes a smooth surface that can be firmly and stably fused with another member by electric fusion. Since uniform fusion can be performed, high durability can be imparted to the connected portion after fusion.
In particular, the L-shaped arm 4 of the scraper device 1 is used almost without replacement, and the holder guide surface 44 may be damaged by long-term use. However, even if the holder guide surface 44 is damaged, the blade portion 52 can be positioned by the tip guide surface 51 provided on the blade tip 6 to be replaced with a constant usage time, and the outer peripheral surface 100S can be formed with a substantially constant thickness. It can be shaved stably. For example, even if the holder guide surface 44 is shaved due to long-term use, it is possible to prevent the shaving thickness from changing.
Further, when positioning the blade portion 52 with respect to the blade tip 6 with respect to the processing start position of the outer peripheral surface 100S of the tubular end portion, the blade portion 6 is first positioned by the holder guide surface 44 of the tip holder 5, and then from that state. The tip guide surface 51 of the blade tip 6 can be positioned with respect to the outer peripheral surface 100S of the tubular end portion by a smooth movement that is slightly fed. Therefore, the blade tip 6 does not have to be suddenly applied to the tubular end portion 100 as in the case where the blade tip 6 is directly positioned with respect to the processing start position of the outer peripheral surface 100S of the tubular end portion.
On the other hand, for example, when the blade tip 6 is suddenly applied to the tubular end portion 100, the possibility that a strong force acts on the blade tip 6 during installation on the spot cannot be denied. There is a possibility that the posture of the blade tip 6 slightly changes or moves on the holder 5. In this embodiment, such a situation can be avoided, the posture of the tip holder 5 with respect to the blade tip 6 can be stabilized, and the shaving thickness can be stabilized in repeated use.

  In this embodiment, since the L-shaped arm 4 is fixed to the shaft 3 and does not move in the direction perpendicular to the axis of the tubular end portion 100, the tubular end portion 100 is bent or the tubular end portion is uneven. Even if the blade tip 6 and the tip holder 5 are swung due to dirt or dirt, the holder guide surface 44 and the tip guide surface 51 can be kept in contact with the outer peripheral surface 100S. And the blade part 52 can also maintain the substantially parallel attitude | position along the outer peripheral surface 100S, and can grind the outer peripheral surface 100S by the substantially parallel fixed attitude | position. By fixing the L-shaped arm 4 so as not to move in a direction perpendicular to the axis of the tubular end portion 100, the holder guide surface 44 and the tip guide surface 51 function appropriately, and the outer peripheral surface 100S of the tubular end portion is made to function. The outer peripheral surface 100S having high smoothness can be generated by cutting with a constant thickness.

  The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications or changes can be made without departing from the scope of the invention.

  In the above embodiment, the rotation mechanism 20 is attached to the fixed sleeve 11 of the fixed portion 2. That is, it is provided at the engaging portion between the fixed portion 2 and the shaft 3. In addition to this, for example, the rotation mechanism 20 may be provided at an engagement portion between the shaft 3 and the short side portion 31 of the L-shaped arm 4.

In the above-described embodiment, the holder pin 43 of the chip holder 5 protrudes outward from the pin long hole 38 of the long side portion 35 of the L-shaped arm 4, and the protruding holder pin 43 is rotatably attached to the long side portion 35. The operation lever 61 is pushed up. By pressing one end of the operation lever 61 toward the long side portion 35, the holder pin 43 is pushed up at the other end of the operation lever 61, and the tip holder 5 is pushed up in the direction of separating against the biasing force of the holder spring 37. .
In addition to this, for example, the tip holder 5 may be pushed up in the direction of separating by pushing up by rotation of the cam member 40 as shown in the modified example of FIG. . In FIG. 9, the cam member 40 is built in the long side portion 35 and is located below the flange portion 41 of the chip holder 5 in the holder accommodating portion 36. Then, by rotating a knob (not shown) integrated with the cam member 40 and rotating the cam member 40 from the dotted line position to the two-dot chain line position, the chip holder is resisted against the urging force of the holder spring 37. 5 can be pushed up in the direction of separating. In the chip holder 5, the flange portion 41 functions as an engaging portion that engages with the cam member 40.
Furthermore, for example, the holder cover 39 may be provided so as to be movable along the longitudinal direction of the pin long hole 38 instead of being fixed to the long side portion 35. In this case, the holder spring 37 can be released from the compressed state by pulling the movable holder cover 39 away from the long side portion 35 along the longitudinal direction of the pin long hole 38. As a result, the tip holder 5 can move in the direction of separation, and the blade tip 6 can be separated from the outer peripheral surface 100S of the tubular end portion. Since the blade tip 6 is not pressed against the outer peripheral surface 100S of the tubular end portion, even if it comes into contact with the outer peripheral surface 100S, it becomes difficult to make a deep scratch that impairs the smoothness of the outer peripheral surface 100S.
In any of these cases, the operation member such as the operation lever 61, the cam member, or the holder cover 39 is movably provided on the long side portion 35 of the L-shaped arm 4, and the chip holder 5 is moved by being operated movably. The blade tip 6 is retracted so that it can be separated from the outer peripheral surface 100S of the tubular end portion.

DESCRIPTION OF SYMBOLS 1 ... Scraper apparatus 2 ... Fixed part 3 ... Shaft 4 ... L-shaped arm 5 ... Tip holder 6 ... Blade tip 11 ... Fixed sleeve 12 ... Fixed leg part 13 ... Moving leg part 14 ... Chuck plate 15 ... Collar part 16 ... Link 17 ... handle 18 ... fixed spring 20 ... rotating mechanism 21 ... mechanism body 22 ... communication hole 23 ... operation hole 24 ... half nut 25 ... nut spring 26 ... release button 31 ... short side 32 ... shaft long hole 33 ... knob hole 34 ... Knob screw 35 ... Long side part 36 ... Holder accommodating part 37 ... Holder spring 38 ... Pin hole 39 ... Holder cover 40 ... Cam member 41 ... Holder body 42 ... Flange part 43 ... Holder pin 44 ... Holder guide surface 45 ... Inclined surface 51 ... Tip guide surface 52 ... Blade 61 ... Operating lever 100 ... Tubular end 100S ... Outer peripheral surface

Claims (6)

A scraper device that cuts the outer peripheral surface of the tubular end portion into a spiral shape by applying a blade tip to the outer peripheral surface of the tubular end portion of a resin pipe or joint member and rotating it around the axis of the tubular end portion. And
A fixing portion that is inserted into and fixed to the tubular end portion;
A shaft that engages with the fixed portion and protrudes from the fixed portion;
An L-shaped arm that has a short side part that engages with the shaft and a long side part that extends from the short side part along the shaft, and is provided so as to be able to rotate around the fixed part;
The blade tip is held and is movably accommodated in a holder accommodating portion formed at the tip of the long side portion of the L-shaped arm in a direction in which the blade tip comes in contact with and separates from the outer peripheral surface of the tubular end portion. A chip holder,
A holder elastic member for biasing the tip holder toward the outer peripheral surface of the tubular end so that the blade tip is pressed against the outer peripheral surface of the tubular end;
The tip holder is retracted so that the blade tip can be separated from the outer peripheral surface of the tubular end portion by an operation which is attached to the L-shaped arm and resists the urging force of the holder elastic member or releases the urging force. An operation member to be
Have
The operating member is
The operation lever is rotatably provided on the long side portion that is connected to the short side portion to form the L-shaped arm , and one end portion of the operation lever is the long side portion of the L-shaped arm. The tip holder is rotated by being pushed down toward the tip so that the blade tip can be separated from the outer peripheral surface of the tubular end,
Scraper device.
A rotation mechanism that is provided at an engagement portion between the fixed portion and the shaft and enables the L-shaped arm to be rotated around the fixed portion;
A plurality of shaft fixing positions for fixing the shaft along the longitudinal direction are provided on the short side portion that engages with the shaft of the L-shaped arm, and the pipe end diameter of the tubular end portion to be processed is The shaft is fixed to one of the shaft fixing positions selected according to
The scraper device according to claim 1.
On the outer peripheral surface of the shaft, a thread groove is formed that meshes with screw teeth of a half nut used in the rotation mechanism,
The rotating mechanism has a nut elastic member that presses the half nut against the outer peripheral surface of the shaft and meshes the screw teeth and the screw groove together with the half nut,
A release member that releases the meshing between the screw teeth of the rotating mechanism and the screw groove of the shaft by moving the half nut by being operated against the urging force of the nut elastic member;
The scraper device according to claim 2 .
The blade tip is
A tip guide surface that hits the outer peripheral surface of the tubular end portion during cutting,
A blade portion that projects from the tip guide surface and cuts the outer peripheral surface of the tubular end portion by a step formed between the tip guide surface and the tip guide surface;
The tip guide surface is attached to the tip holder in a state of being forward of the cutting direction from the blade portion,
The scraper device according to any one of claims 1 to 3 .
The tip holder has a holder guide surface that hits the outer peripheral surface of the tubular end portion at the time of cutting,
The blade tip has a blade portion that projects from the holder guide surface and cuts the outer peripheral surface of the tubular end portion by a step formed between the holder guide surface and the blade tip;
The holder guide surface is attached to the chip holder in a state where it is on the front side in the feed direction from the blade part,
The scraper apparatus as described in any one of Claim 1 to 4 .
The holder guide surface and the chip guide surface;
The blade tip can be attached to the tip holder so that the holder guide surface and the tip guide surface are flush with each other.
The scraper device according to claim 5 .

Images