JP2016203355A - Scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scraper, in which during cutting, chips are prevented from getting entangled with the scraper and a pipe so as to allow fusion between the pipe and a joint to be secured and a blade to be moved with comparatively small force.SOLUTION: A scraper 1 comprises a scraper main body 11 having an insertion hole 13 into which an end part of a pipe P can be inserted formed therein and a blade 21 having a cutting blade 21C for cutting an outer peripheral surface ES of the end part of the pipe, which cuts the outer peripheral surface of the end part of the pipe by rotating the scraper main body around a center shaft line CL of the pipe while pressure-contacting the cutting blade of a blade with the outer peripheral surface of the end part of the pipe inserted into the insertion hole. The scraper further comprises a cover 31 which moves between a close position where the cutting blade of the blade is covered from outside of the scraper main body and an open position where the cutting blade of the blade is exposed to outside the scraper main body, where a space S for storing chips of the pipe is formed between the blade and the cover when the cover is at the close position.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a scraper capable of cutting an outer peripheral surface of an end portion of a pipe formed from a cuttable material such as a resin.

  Conventionally, for example, when pipes are connected in a construction of a resin gas pipe or a water pipe, it is generally performed that the ends of the pipes are connected by a joint and heat-sealed. However, with regard to pipes, particularly existing pipes, an altered layer due to oxidation or the like may be formed on the outer peripheral surface thereof. Since this deteriorated layer becomes an obstacle to heat fusion, for example, the deteriorated layer is scraped off in advance before connecting the pipes using a scraper described in Patent Document 1.

Japanese Utility Model Publication No. 3-103101

  However, in the scraper described in Patent Document 1, since the cutting edge for cutting formed on the blade is exposed to the outside, the chips discharged by cutting the outer peripheral surface of the pipe end are scraper and pipe. Therefore, it is necessary to remove chips after the work is completed or during the work, and the work is complicated. In addition, if chips get entangled with a rotating roller that assists in rotating the pipe for cutting the pipe, the pipe cannot be accurately aligned with the scraper, so the pipe may not be cut accurately. is there. As a result, there is a risk of causing poor fusion at the time of connecting the pipe and the joint, which may lead to an accident of gas and water leakage.

  Further, in the scraper according to Patent Document 1, by operating a bar-shaped lever, the cutting blade is moved toward the pipe so as to be in pressure contact with the pipe outer peripheral surface, and the blade is moved away from the pipe outer peripheral surface. be able to. When the blade is separated from the outer peripheral surface of the pipe, it is necessary to lift the lever by hooking the finger on the end of the lever. However, in order to lift the lever with the fingertip, a large force is structurally required.

  Accordingly, an object of the present invention is to prevent scraps from being entangled with the scraper and the pipe during cutting, to ensure fusion between the pipe and the joint, and to enable the blade to move with a relatively small force. Is to provide.

According to the invention of claim 1,
A scraper body in which an insertion hole into which an end of a pipe can be inserted is formed;
A blade having a cutting edge attached to the scraper body so as to face the outer peripheral surface of the end of the pipe inserted into the insertion hole, and cutting the outer peripheral surface of the end of the pipe;
With
With the cutting edge of the blade pressed against the outer peripheral surface of the end of the pipe inserted into the insertion hole, the scraper body is rotated around the central axis of the pipe, and the outer periphery of the end of the pipe Cutting the surface,
A scraper,
And a cover that moves between a closed position that covers the cutting edge of the blade from the outside of the scraper body and an open position that exposes the cutting edge of the blade to the outside of the scraper body,
When the cover is in the closed position, a space for accommodating chips generated by cutting the pipe is formed between the blade and the cover.
A scraper is provided.

  That is, according to the first aspect of the present invention, chips generated during pipe cutting can be accommodated and held in a space formed between the blade and the cover. This prevents chips from getting entangled with the scraper and the pipe, and further with the rotating roller. As a result, it is not necessary to remove chips during the operation, and further, the fusion between the pipe and the joint can be ensured.

According to the invention of claim 2,
Furthermore, an interlocking mechanism that moves the blade in accordance with the movement of the cover between the closed position and the open position,
The interlocking mechanism, when the cover is moved to the closed position, moves the blade to a cutting position where the cutting blade is pressed against the outer peripheral surface of the end of the pipe inserted into the insertion hole, When the cover is moved to the open position, the blade is moved to a release position where the cutting blade is separated from the outer peripheral surface of the end of the pipe inserted into the insertion hole.
A scraper according to claim 1 is provided.

  That is, in the invention of claim 2, since it has a size sufficient to form a space in which chips can be accommodated, the end portion of the cover on which the finger is put when moving the cover is the lever of the scraper of Patent Document 1. Larger than the end of the. Therefore, since it is easy to apply a force to the end portion, the cover can be moved between the closed position and the open position with a relatively small force. And since the interlocking mechanism which moves a braid | blade with the movement of a cover is provided, a braid | blade can be moved between a cutting position and a release position with comparatively small force. Further, since the blade can be moved between the cutting position and the release position by one operation of opening and closing the cover, the cutting operation can be performed with a small number of procedures.

  According to the present invention, the chips generated during cutting of the pipe are accommodated and held in a space formed between the blade and the cover, whereby the chips are scrapers, particularly a rotating roller, described later. It is possible to prevent the guide roller and the feed roller and the pipe from becoming tangled. As a result, it is not necessary to remove chips during the cutting operation, and further, the fusion between the pipe and the joint can be ensured. In addition, it is easy to apply a force to the end part of the cover where a finger is applied when moving the cover, and an interlocking mechanism that moves the blade as the cover moves is provided. It can be moved between release positions. Further, since the blade can be moved between the cutting position and the release position by one operation of opening and closing the cover, the cutting operation can be performed with a small number of procedures.

The top view of the scraper concerning the embodiment of the present invention. The rear view of the scraper which concerns on embodiment of this invention. XX sectional drawing of FIG. 1 when a cover exists in a closed position and a braid | blade exists in a cutting position. FIG. 2 is a cross-sectional view taken along line XX of FIG. 1 when the cover is in an open position and the blade is in a release position. The top view of the blade of the scraper which concerns on embodiment of this invention. The figure explaining the usage method of the scraper which concerns on embodiment of this invention.

  As shown in FIGS. 1 and 2, the scraper 1 according to the present embodiment includes a scraper body 11, a substantially rectangular plate-shaped blade 21 attached to the scraper body 11, and a space S that accommodates chips together with the blade 21. And a cover 31 to be formed.

  The scraper body 11 is formed of a cylindrical portion 11C having a generally cylindrical shape, and a dome-shaped portion 11D which is formed integrally with the cylindrical portion 11C and has a generally dome shape. ing. The cylindrical portion 11C is formed with an insertion hole 13 into which an end portion of the pipe P cut from the bottom portion of the scraper body 11 is inserted. The insertion hole 13 has a diameter slightly larger than the diameter of the pipe P to be cut, and extends along the central axis 13L extending in the direction from the bottom 11B of the scraper body 11 toward the top 11T. And open at the bottom 11B of the scraper body 11. Further, in the center portion of the top portion 11T of the scraper body 11, a through hole 15 having a hexagonal cross section is formed in the present embodiment. The cross-sectional shape of the through hole 15 is not limited to a hexagon, and may be other shapes such as a triangle and a quadrangle.

  As shown in FIG. 2, the cylindrical portion 11 </ b> C of the scraper body 11 includes a guide roller 17 that is a rotating roller for assisting the rotation of the pipe P with respect to the scraper 1 when cutting the outer peripheral surface ES of the end of the pipe P. A feed roller 19 is attached.

  In this embodiment, the guide roller 17 is a metal roller having a smooth surface, and can freely rotate around a shaft portion 17S extending in parallel with the central axis 13L of the insertion hole 13.

  The feed roller 19 is a metal roller in the present embodiment having a thread formed on the surface thereof, and has a shaft portion 19S extending in a direction slightly inclined from the central axis 13L of the insertion hole 13 in a predetermined direction. Can rotate freely.

  The blade 21 is a metal rectangular plate, for example, and is attached to the scraper body 11 via a leaf spring 23. As shown in FIG. 5, the blade 21 is formed with a cutting edge 21 </ b> C for cutting the outer peripheral surface ES of the end portion of the pipe P on the side portion on the dome-shaped portion 11 </ b> D side at the approximate center in the longitudinal direction of the blade 21. ing.

  The blade tip of the cutting blade 21C is brought into contact with the end outer peripheral surface ES of the pipe P more precisely on the surface of the blade 21 that is in contact with the outer peripheral surface ES of the pipe P inserted into the insertion hole 13. A recessed portion 21D is formed as described above.

  As shown in FIGS. 3 and 4, the blade 21 advances and retreats with respect to the insertion hole 13 by the rotation of the camshaft 25 in which the portion in contact with the blade 21 has a semicircular cross section and the action of the leaf spring 23. be able to. The camshaft 25 is connected to the cover 31 via a lever 27 having a portion extending perpendicular to the camshaft 25, and can rotate as the cover 31 is opened and closed. The lever 27 is fixed to the cover 31 so as to move integrally with the cover 31.

  As shown in FIG. 3, the guide roller 17, the feed roller 19, and the blade 21, particularly the cutting edge 21 C formed on the blade 21, have a cylindrical positional relationship with the apex of an equilateral triangle in the insertion hole 13. It is attached to the shape part 11C. In other words, the insertion holes 13 are arranged at intervals of approximately 120 ° around the central axis 13L.

  The cover 31 is a plastic plate in the present embodiment, and is curved along the shape of the cylindrical portion 11 </ b> C of the scraper body 11. Thereby, the cover 31 is formed so as not to protrude as much as possible from the cylindrical portion 11 </ b> C of the scraper body 11. This is because the cover 31 interferes with an obstacle when there is an obstacle near the end of the pipe P to be cut when the scraper 1 is rotated as will be described later when cutting the outer peripheral surface ES of the pipe P. This is to prevent it from happening. As an example in which the scraper 1 may interfere with an obstacle, a main pipe and a branch pipe that is attached to the main pipe by, for example, a pipe shaft saddle type joint and extends parallel to the main pipe in the vicinity thereof. And a pipe structure having the following. As another example, a pipe structure having a main pipe and a joint branch pipe attached to the main pipe so as to extend in a direction perpendicular to the pipe axis of the main pipe, such as a pipe straight saddle type joint. Is mentioned. In such cases, the branch pipe may become the obstacle described above when cutting the main pipe and the main pipe when cutting the branch pipe.

  The cover 31 has a closed position (FIG. 3) that covers the cutting edge 21C of the blade 21 from the outside of the scraper body 11, and an open position (FIG. 4) that exposes the cutting edge 21C of the blade 21 to the outside of the scraper body 11. In between, it can move around the camshaft 25.

  In the scraper 1 of the present embodiment, the cam shaft 25 is rotated via the lever 27 by opening and closing the cover 31, and the blade 21 is advanced and retracted with respect to the insertion hole 13 by the rotation of the cam shaft 25 as described above. can do. Thereby, when the cover 31 is moved to the closed position, the blade 21 can be moved to a cutting position where the cutting blade 21C is pressed against the outer peripheral surface ES of the end of the pipe P inserted into the insertion hole 13. Further, when the cover 31 is moved to the open position, the blade 21 can be moved to a release position where the cutting edge 21C is separated from the outer peripheral surface ES of the end of the pipe P inserted into the insertion hole 13. As described above, in the scraper 1 according to the present embodiment, the blade 21 is moved between the cutting position and the release position by one operation of opening and closing the cover 31 by the above-described structure using the camshaft 25, the lever 27, and the like. It can be moved with. As a result, according to the scraper 1 according to the present embodiment, the cutting work of the pipe P can be performed with a few procedures.

  As shown in FIG. 3, when the cover 31 is in the closed position, a space S that stores and holds chips generated by cutting the outer peripheral surface ES of the end of the pipe P between the blade 21 and the cover 31. Is formed.

  When the cover 31 is moved from the closed position to the open position, the cover 31 is lifted by placing a finger on the end portion 31E of the cover 31 that is farthest from the camshaft 25. Further, when the cover 31 is moved from the open position to the closed position, the cover 31 in the open position is pushed down toward the scraper body 11. In the cover 31, in particular, an end portion 31 </ b> E where a finger is applied to move the cover 31 from the closed position to the open position has a certain size in order to form the space S. As a result, it is easier to apply force to the cover 31 than to operate the lever as in the scraper of Patent Document 1, so that the cover 31 can be opened and closed with a small force. As a result, the blade 21 can be moved between the cutting position and the release position with a smaller force as compared with the scraper of Patent Document 1.

  Next, the usage method of the scraper 1 which concerns on this embodiment is demonstrated.

  First, with respect to the insertion hole 13 of the scraper 1 in which the cover 31 is open, the end portion of the pipe P to be cut is arranged so that the center axis 13L of the insertion hole 13 and the center axis CL of the pipe P coincide with each other. Insert the blade 21 to the position of the cutting edge 21C. Then, the cover 31 is pushed down and moved to the closed state, and accordingly, the blade 21 is moved to a cutting position where the cutting edge 21C of the blade 21 is pressed against the outer peripheral surface ES of the end of the pipe P.

  Next, the scraper 1 is rotated about the central axis CL of the pipe P, and the end outer peripheral surface ES of the pipe P is cut by the cutting blade 21C. At this time, the thread formed on the surface of the feed roller 19 slightly bites into the surface of the pipe P, and the feed roller 19 is slightly tilted in a predetermined direction from the central axis 13L of the insertion hole 13 as described above. It rotates around the shaft portion 19S extending in the direction. As a result, the feed roller 19 is cut by the attachment direction of the shaft portion 19S extending in a predetermined direction inclined from the central axis 13L of the insertion hole 13 while cutting the outer peripheral surface ES of the end portion of the pipe P. A force is applied from 19 to the pipe P in the insertion direction of the pipe P, and the pipe P can be gradually moved toward the top portion 11T of the scraper body 11 along the central axis 13L of the insertion hole 13. As a result, the end outer peripheral surface EP can be cut while gradually inserting the pipe P into the insertion hole 13, so that a wide range of the end outer peripheral surface ES of the pipe P can be cut.

  In the scraper 1 according to the present embodiment, chips generated when the end outer peripheral surface EP of the pipe P is cut can be accommodated and held in a space S formed between the blade 21 and the cover 31. Thereby, it becomes unnecessary to remove chips during the cutting operation, and the cutting operation is facilitated. In addition to this, chips are prevented from getting entangled with the scraper and the pipe during cutting. In particular, the chips are prevented from getting tangled with the guide roller 17 and the feed roller 19, and the pipe P can be accurately aligned with the scraper 1. As a result, the end outer peripheral surface ES of the pipe P can be accurately cut, and as a result, the fusion between the pipe P and the joint can be ensured.

  After cutting, a finger is put on the end portion 31E of the cover 31, and the cover 31 is lifted and moved to the open position. Then, the blade 21 moves to the release position, and the pipe P can be removed from the insertion hole 13. Cleaning after cutting may be performed by removing the chips contained in the space S between the blade 21 and the cover 31, and is very easy as compared with the scraper of Patent Document 1.

  In addition, when rotating the scraper 1, the scraper 1 can be rotated using the electric screwdriver drill D. In this case, as shown in FIG. 6, the adapter A having a complementary shape that can be fitted into the through hole 15 formed at the center of the top of the dome-shaped portion 11D is attached to the chuck DC of the electric screwdriver drill D. Install. Thereby, the scraper 1 can be rotated with the electric screwdriver drill D, and the outer peripheral surface ES of the end part of the pipe P can be cut.

  In the case of manual operation, the dome-shaped portion 11D of the scraper body 11 is gripped and rotated. In order to make it easy to grip the dome-shaped portion 11D, the dome-shaped portion 11D is formed with irregularities and through holes.

  In addition, you may comprise a scraper combining the component of the said embodiment arbitrarily. That is, the present invention is not limited to the scraper of the embodiment as long as the features and functions of the present invention can be realized.

  For example, if the blade 21 can be accurately brought into contact with the outer peripheral surface ES of the end portion of the pipe P without providing the recess 21D on the blade 21, the recess 21D is provided on the blade 21. It does not have to be. This is particularly true when the diameter of the pipe P to be cut is small.

  In the above-described embodiment, the guide roller 17 and the feed roller 19 are made of metal. However, the guide roller 17 and the feed roller 19 may be made of resin, and any material can be used as long as it can exhibit the functions of the guide roller 17 and the feed roller 19. It may be a thing.

  Furthermore, in the above-described embodiment, the cover 31 is made of plastic. However, the cover 31 may be made of metal such as iron or aluminum, and any material that can exhibit the function of the cover 31 can be used. Also good.

DESCRIPTION OF SYMBOLS 1 Scraper 11 Scraper body 13 Insertion hole 21 Blade 21C Cutting blade 23 Leaf spring 25 Camshaft 27 Lever 31 Cover CL (Pipe) center axis ES (Pipe) end outer peripheral surface P Pipe S Space

Claims (2)

A scraper body in which an insertion hole into which an end of a pipe can be inserted is formed;
A blade having a cutting edge attached to the scraper body so as to face the outer peripheral surface of the end of the pipe inserted into the insertion hole, and cutting the outer peripheral surface of the end of the pipe;
With
With the cutting edge of the blade pressed against the outer peripheral surface of the end of the pipe inserted into the insertion hole, the scraper body is rotated around the central axis of the pipe, and the outer periphery of the end of the pipe Cutting the surface,
A scraper,
And a cover that moves between a closed position that covers the cutting edge of the blade from the outside of the scraper body and an open position that exposes the cutting edge of the blade to the outside of the scraper body,
When the cover is in the closed position, a space for accommodating chips generated by cutting the pipe is formed between the blade and the cover.
Scraper. Furthermore, an interlocking mechanism that moves the blade in accordance with the movement of the cover between the closed position and the open position,
The interlocking mechanism, when the cover is moved to the closed position, moves the blade to a cutting position where the cutting blade is pressed against the outer peripheral surface of the end of the pipe inserted into the insertion hole, When the cover is moved to the open position, the blade is moved to a release position where the cutting blade is separated from the outer peripheral surface of the end of the pipe inserted into the insertion hole.
The scraper according to claim 1.

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