JP5283224B2 - Scraper for resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive manual scraper for a resin pipe, capable of exactly scraping an outer-peripheral surface of the resin pipe required in performing saddle fusion. <P>SOLUTION: A body frame 1 holding a resin pipe P is structured to be pivoted to the right and left around the resin pipe P by the operation of a handle 10. On the body frame 1, a slider 22 having a cutting tool 17 cutting a surface of the resin pipe P and a feed screw 13 thereof are provided. The feed screw 13 is provided with a driving roller 14 for rotating the feed screw 13 only when the body frame 1 is pivoted in either one direction of the right and left, thereby to perform cutting by the cutting tool 17 while the slider 22 is being moved in the axial direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a scraper for a resin tube used for thinly cutting a skin on the outer peripheral surface of a resin tube serving as a fusion part before the resin tube is fused.

  In recent years, resin pipes made of polyethylene or the like having excellent durability and earthquake resistance have been widely used as gas pipes and water pipes. When branching from an existing resin pipe, a method is used in which a resin branching unit called a saddle is fused to the outer periphery of the existing resin pipe and then perforated.

  In this way, when the saddle is fused to the outer peripheral surface of the existing resin pipe, the outer skin of the outer peripheral surface that becomes the fused portion is cut thinly to remove the deteriorated layer and the foreign matter adhesion layer that obstruct the fusion. It is necessary to keep it. For this purpose, scrapers for resin pipes as shown in Patent Documents 1, 2, and 3 have already been proposed.

  The scraper for resin pipes of Patent Document 1 is provided with a cutting part and a feed roller inclined with respect to the surface of the resin pipe in a main body part holding the resin pipe, and rotating the main body part around the resin pipe. It is gradually moved in the axial direction of the resin tube by a feed roller, and the skin on the outer peripheral surface of the resin tube is thinly cut so as to peel the apple skin. This resin pipe scraper scrapes the entire circumference of the resin pipe, but when performing saddle fusion, it is sufficient to scrape about 180 degrees, which is half of the fusion side of the resin pipe. There is a disadvantage that it will be done.

  The scraper for resin pipes of Patent Document 2 is provided with a worm gear that freely moves in a main body part that holds the resin pipe. In other words, the outer skin of the resin pipe is cut thinly while moving the main body in a certain direction. This resin pipe scraper can scrape about 180 degrees, half of the resin pipe, but the movement of the worm gear becomes unstable depending on the contact state with the surface of the resin pipe, and the main body can be moved accurately at a constant pitch. May not be possible. If this movement is not performed accurately, the same surface may be scraped many times or a part that is not scraped may occur.

  Patent Document 3 discloses a resin pipe scraper driven by an electric drive unit. However, this resin tube scraper has a complicated structure and is expensive, and requires a power source.

Japanese Patent No. 3863101 Japanese Patent No. 3136011 Japanese Patent No. 3437628

  The object of the present invention is to solve the above-mentioned conventional problems and to provide an inexpensive manual-type resin pipe scraper capable of accurately scraping about 180 degrees, which is half of the resin pipe required for saddle fusion. It is to be.

  The scraper for resin pipes of the present invention made to solve the above-mentioned problem makes it possible to turn the main body frame holding the resin pipe left and right around the resin pipe by operating the handle, and to the main body frame, the surface of the resin pipe A slider with a cutting tool for cutting and a feed screw are attached, and the feed screw is provided with a drive roller that rotates the feed screw only when the body frame is turned in either the left or right direction. It is what.

  It is preferable that the rotation of the feed screw is transmitted to the slider via a releasable nut provided on the slider so as to be movable by a spring.

  Further, as in claim 3, it is preferable to install a pair of left and right cutting tools on the inner surface of the slider.

  Further, it is preferable that the attachment position of the handle with respect to the main body frame can be changed.

  The scraper for a resin pipe of the present invention scrapes the surface of the resin pipe with a bite while turning the main body frame attached to the resin pipe so as to hold the resin pipe by a handle operation. The feed screw is rotated only when it is turned in one of the left and right directions, and the slider provided with the cutting tool is accurately fed in the axial direction of the resin tube. For this reason, it is possible to uniformly scrape the surface of the resin tube. Moreover, since it is not electric, it can be provided at low cost.

  If the structure is such that the rotation of the feed screw is transmitted to the slider via a releasable nut movably provided on the slider by a spring as in claim 2, the releasable nut is operated at the end of the operation to operate the feed screw. It is possible to quickly return the slider to the starting point by releasing the screwing.

  If a pair of left and right cutting tools are installed on the inner surface of the slider as in the third aspect, the surface of the resin tube can be scraped over an angle range wider than the turning angle of the main body frame. For this reason, even when a sufficient turning angle cannot be taken inside the excavated groove, the surface of the resin pipe can be scraped over 180 degrees.

  Further, if the position of the handle attached to the main body frame can be changed as in claim 4, the handle can be operated from the upper side even when it is desired to scrape the side surface of the resin pipe over 180 degrees. It is convenient when working with.

It is a partially cutaway front view showing an embodiment of the present invention. It is a top view which shows embodiment of this invention. It is a side view which shows embodiment of this invention. It is sectional drawing of a perpendicular direction to the axis which shows embodiment of this invention. It is a side view which shows the state which opened the main body frame. It is a partially cutaway front view at the time of completion | finish of a scrape. It is an expansion perspective view of a bite part. It is a perspective view of an openable nut. It is the front view and top view of an openable nut. It is explanatory drawing of a motion of a slider and a byte.

Embodiments of the present invention will be described below.
As shown in FIGS. 1-4, the scraper for resin pipes of this invention is equipped with the main body frame 1 which holds the existing resin pipe P in two positions away in the axial direction. The main body frame 1 includes a first frame 3 having semicircular recesses 2 and 2 at both ends and a second frame 5 having semicircular recesses 4 and 4 at both ends, and an axis of the resin pipe P. This is a structure connected by parallel connecting shafts 6. The first frame 3 and the second frame 5 are made of metal, and the shapes of the semicircular recesses 2 and 4 are set slightly larger than the outer diameter of the resin pipe P.

  As shown in FIG. 5, the second frame 5 can be opened outward with respect to the first frame 3. From the state of FIG. 5, the second frame 5 is closed so as to wrap the resin pipe P, and then the catch clip 7 provided on the opposite side of the connecting shaft 6 is closed, whereby the main body frame 1 causes the resin pipe P to It will be held at two positions apart in the axial direction. The portions that actually come into contact with and hold the resin pipe P are a roller 12 and a driving roller 14 described below.

  Note that the two ends of the first frame 3 are connected to each other by two guide rods 8 and 8 and a connecting bar 9. A handle 10 protruding in a U shape is attached to the outside of the first frame 3. The mounting position of the handle 10 may be in the lateral direction as shown by the imaginary line in FIG. Further, both end portions of the second frame 5 are also connected by two roller shafts 11 and 11 and a connecting bar 9. The roller shafts 11 and 11 are provided with rollers 12 that come into contact with the outer peripheral surface of the resin tube P at both ends.

  The first frame 3 is provided with a feed screw 13 at the center position of the two guide rods 8 and 8. The feed screw 13 is provided with a driving roller 14 that rotates in contact with the outer peripheral surface of the resin pipe P at its end. The driving roller 14 includes a one-way power transmission means 15 such as a one-way clutch. ing. Therefore, the drive roller 14 rotates freely in one direction with respect to the feed screw 13, but rotates with the feed screw 13 when rotating in the opposite direction. The outer peripheral surface of the drive roller 14 is preferably knurled so that a sufficient frictional force can be obtained. As the one-way power transmission means 15, in addition to the one-way clutch, a ratchet mechanism including a ratchet gear and a pawl can be used.

  A unidirectional power transmission means 16 is also provided between the feed screw 13 and the first frame 3. For this reason, the feed screw 13 can rotate only in one direction with respect to the first frame 3. Its operation will be described later. Since the one-way clutch can be a commercially available product, description of the internal structure is omitted.

  A slider 22 that can move in the axial direction of the resin pipe P is mounted on the first frame along guide rods 8 and 8 that connect both ends of the first frame. As shown in FIG. 4, the inner surface of the slider 22 is formed in an arc shape corresponding to the outer peripheral diameter of the resin pipe P, and the cutting tools 17 and 17 are disposed facing the outer surface facing outward. In this embodiment, a pair of left and right bytes 17 and 17 are arranged. However, as will be described later, the number of the bytes 17 may be one or three or more.

  As shown in FIG. 7, each tool 17 is screwed to the tip of the tool holder 18. The bite holder 18 is pressed inward by a spring 19. For this reason, when the main body frame 1 is turned left and right by the handle 10, the right cutting tool 17 cuts the surface of the resin pipe P when turning right and the left cutting tool 17 turns when turning left. The cutting depth is determined by the amount of protrusion of the cutting edge 26 from the contact surface 25 formed on the cutting tool 17.

  The feed screw 13 and the slider 22 are screwed together by a releasable nut 20 provided on the slider 22. The openable nut 20 is provided on a slider 22 so as to be movable by a spring 21 as shown in FIG. As shown in FIGS. 8 and 9, the openable nut 20 is formed with a long hole 23 through which the feed screw 13 can be passed, and a pin 24 is driven into the lower inner surface along the lead angle of the feed screw 13. It is. However, a female screw that can be screwed into the feed screw 13 can be formed on the bottom surface of the long hole 23. Since the releasable nut 20 is springed outward by the spring 21, the pin 24 or the female screw of the releasable nut 20 is always engaged with the feed screw 13. However, if the openable nut 20 is pushed against the spring 21, the meshing with the feed screw 13 is released, so that the quick return can be performed.

  As shown in FIG. 5, the scraper for a resin pipe of the present invention configured as described above opens the second frame 5 to the outside with respect to the first frame 3, holds the existing resin pipe P, and then catches the catch clip 7. Is used in a closed state. In this state, the roller 12, the driving roller 14, and the cutting tools 17 and 17 are in contact with the outer peripheral surface of the resin pipe P, respectively. These contact pressures are set in an appropriate range by adjusting the catch clip 7 portion. The slider 22 is positioned at the starting end as shown in FIG.

  When the handle 10 is manually operated from this state and the main body frame 1 is reciprocally turned 45 degrees to the left and right, that is, 90 degrees around the resin pipe P, the right bit 17 is placed at the top of the resin pipe P when turning right. When turning left, the left bit 17 cuts the range of 90 degrees to the left from the top of the resin pipe P. Since it is difficult to turn 90 degrees accurately in actual work, if the reciprocating turn is made within an appropriate angle range of about 90 to 150 degrees, the necessary angle of 180 degrees or more can be scraped. Simultaneously with the reciprocating turning of the main body frame 1, the slider 22 gradually moves in the axial direction of the resin pipe P.

  FIG. 10 is an explanatory diagram. First, when the main body frame 1 is turned to the right and cutting is performed by the right bit 17, the driving roller 14 in contact with the resin pipe P also rotates to the right. The drive roller 14 only rotates freely by the action of the one-way power transmission means 15 such as a clutch, and the feed screw 13 does not rotate. Further, the feed screw 13 is locked to the first frame 3 by the action of the one-way power transmission means 16, and the feed screw 13 is fixed to the main body frame 1 so as not to rotate. Therefore, the slider 22 does not move in the axial direction with respect to the main body frame 1 when turning right, and circumferential cutting is performed at the same position.

  Next, when the main body frame 1 is turned left and cutting is performed by the left bit 17, the drive roller 14 rotates counterclockwise. At this time, since the one-way power transmission means 15 is locked, the feed screw 13 rotates together with the drive roller 14. Further, the feed screw 13 rotates freely with respect to the first frame 3 by the action of the one-way power transmission means 16. As a result, the slider 22 screwed with the feed screw 13 moves forward with respect to the main body frame 1. By repeating this operation, the outer peripheral surface of the resin pipe P is cut as shown in the lower part of FIG.

  If the handle 10 is turned 90 degrees, this cutting can be performed by 180 degrees, which is the required cutting angle of the outer peripheral surface of the resin pipe P. Unlike the conventional product, the one-way power transmission means 15 enables accurate feeding. Also, the axial distance for cutting can be freely adjusted. As shown in FIG. 6, the end portion of the feed screw 13 has a portion where no screw is formed, and the slider 22 stops when moving to this point. When the necessary range of cutting is completed, the catch clip 7 may be opened and the main body frame 1 may be removed, and the releasable nut 20 may be pushed to release the threaded engagement with the feed screw 13 and the slider 22 may be returned to the start position.

  In this manner, the resin tube scraper of the present invention can uniformly scrape the necessary surface area of the resin tube P by manual operation. Note that at least one unidirectional power transmission means 15 is essential, but the unidirectional power transmission means 16 may be omitted.

  In the embodiment described above, the pair of left and right cutting tools 17 are used, but even if the cutting tool 17 is used as a single unit, the angle range of 180 degrees can be cut by rotating the handle 10 by 180 degrees. Further, if the number of cutting tools 17 is increased, the turning angle of the handle 10 can be reduced. For example, if there are three cutting tools 17, the turning angle of the handle 10 can be 60 degrees, and if the number of cutting tools 17 is four, the turning angle of the handle 10 can be 45 degrees.

  Further, in the embodiment described above, the handle 10 is attached to the upper part of the main body frame 1, but when the saddle is to be welded to the side surface of the resin pipe P, the side surface of the resin pipe P is scraped over an angle range of 180 degrees. There is a need. In this case, the main body frame 1 may be set sideways with respect to the resin pipe P. However, the handle 10 also becomes sideways if it is left as it is, and there is a possibility that the operation is difficult to be performed inside the narrow groove. Therefore, if the handle 10 can be changed to the side of the main body frame 1 as shown by an imaginary line in FIG. 2, the side surface of the resin pipe P is scraped by an operation from above the resin pipe P. Is possible.

P resin pipe 1 body frame 2 semicircular recess 3 first frame 4 semicircular recess 5 second frame 6 connecting shaft 7 catch clip 8 guide rod 9 connecting bar 10 handle 11 roller shaft 12 roller 13 feed screw 14 drive roller 15 One-way power transmission means 16 One-way power transmission means 17 Bite 18 Bite holder 19 Spring 20 Releasable nut 21 Spring 22 Slider 23 Long hole 24 Pin 25 Contact surface 26 Cutting edge

Claims (4)

  The body frame holding the resin tube can be turned left and right around the resin tube by operating the handle, and a slider with a cutting tool for cutting the surface of the resin tube and its feed screw are attached to the body frame. A scraper for a resin pipe, characterized in that a drive roller for rotating the feed screw only when the main body frame is turned in one of the left and right directions is provided on the feed screw.   2. The resin pipe scraper according to claim 1, wherein the rotation of the feed screw is transmitted to the slider through an openable nut provided on the slider so as to be movable by a spring.   2. A scraper for a resin pipe according to claim 1, wherein a pair of left and right cutting tools are provided on the inner surface of the slider.   2. A scraper for a resin pipe according to claim 1, wherein the position of the handle attached to the main body frame can be changed.

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