JP2009142877A - Tube end correcting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube end correcting tool with which a tube end is corrected into a complete circle by smaller force than that of a conventional tool, and the chips are prevented from intruding into piping when performing chamfering at the same time as the correction to the complete circle. <P>SOLUTION: The tool is for correcting the deformation of the tube end by rotationally inserting a shaft member which is projected in the axial direction of the rotation of a handle into the tube end. The shaft member has the followings on the same axis, that is: an annular swollen part which formes the maximum outside diameter of the shaft member, and is inserted into the tube end to correct the deformation; and a conical part which is located closer to the handle than the annular swollen part, and forms a conical surface internally touchable to a receiving port at the tube end. In the annular swollen part, the outside diameter is set to smaller than the inside diameter of the complete circle of the tube end. Further, the shaft member has two inclined planes from the tip to the annular swollen part, which are opposite each other. A cutting tool is provided at the conical part for chamfering the inner periphery of the receiving port of the tube end. The cutting tool for chamfering is an edge which is formed by notching a part of the conical part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tube end correcting tool for restoring a tube end deformed into an ellipse or the like into an original perfect circle.

  Pipes such as water supply pipes have a perfect cross section when manufactured. For example, when cutting with a scissor-type tube cutter to adjust the length at the site, the cut surface, that is, the pipe end is deformed into an ellipse or the like. Sometimes. In particular, in the case of a metal-resin composite three-layer tube in which a metal layer is an intermediate layer and the inside and outside are covered with a synthetic resin, deformation tends to remain due to the plasticity of the metal layer.

  If the pipe end is deformed as described above, it is difficult to connect other piping equipment such as a joint, and there is a problem that a local unsealed part occurs even if it is forcibly connected. The pipe end is repaired to a perfect circle using a pipe end correction tool.

  Patent Documents 1 and 2 show conventional tube end correction tools, both of which are provided with a rod-like shaft member on a rotating operation grip (handle). The shaft member turns the deformed tube end into a perfect circle by turning it from the tube end. In particular, the shaft member shown in FIG. 21 of Patent Document 1 forms an inclined surface on the four end surfaces of the cylinder. On the other hand, the thing of patent document 2 is a shape which provided the node (part shown by the code | symbol 12 of patent document 2) from which the outer diameter becomes large in two places, the front-end | tip and base of a cylinder.

  Furthermore, the thing of patent document 1 * 2 employ | adopted the structure which chamfers a pipe end inner peripheral surface simultaneously with the above-mentioned perfect circle restoration work. Specifically, in Patent Document 1, a pair of chamfering projections (portions indicated by reference numeral 33 in Patent Document 1) are provided at two locations at the base of the shaft member. Three chamfering tools (portions indicated by reference numeral 34 in Patent Document 2) are provided at equal intervals in the circumferential direction at the base of the member. And by the chamfering by these structures, a joint etc. can be easily inserted and connected to the pipe end.

JP-A-2005-7663 German utility model No. 202005004219

  By the way, when the shaft member is inserted and the pipe end is restored to a perfect circle, if the outer diameter of the shaft member is smaller than the inner diameter of the tube body, the required roundness cannot be ensured. On the other hand, if the outer diameter of the shaft member is set larger than the inner diameter of the tube body, the roundness increases, but the frictional force between the shaft member and the tube end increases, so that the work of turning the shaft member becomes difficult. Further, since the pipe end is deformed to expand, there arises a problem that the connection with the joint or the like is loosened.

  In view of such a viewpoint, it is necessary to appropriately set the outer diameter of the shaft member, but this is not clearly shown in Patent Documents 1 and 2. However, in Patent Document 1, inclined surfaces (portions indicated by reference numerals 38a and 38b in Patent Document 1) are provided on the four surfaces of the shaft member to form a rectangular cross section, and in Patent Document 2, three outer peripheral portions of the node are planar in the axial direction. By cutting (part indicated by reference numeral 28 in Patent Document 2) into a substantially triangular rice ball shape, the contact area between the outer periphery of the shaft member and the inner periphery of the pipe end is reduced, and the rounding operation can be performed with a relatively small force. There is a statement to that effect.

  However, when these products are actually used to round the pipe end, it is necessary to completely insert the shaft member into the pipe end to the root. In the case of Patent Document 2, the outer circumference of the member is in contact with the inner circumference of the pipe end. Therefore, the contact area between the two is still large at the time of rounding, and a considerable force (torque) is required to turn the shaft member around the pipe end.

  In addition, regarding chamfering, the one in Patent Document 1 does not scrape the inner periphery of the pipe end, but crushes the inner periphery of the pipe end with a protrusion, so that a considerable force is required. There is also a problem that the outer surface is inadvertently expanded in diameter only by the amount of crushing the inner surface. On the other hand, in Patent Document 2, since the inner periphery of the pipe end is scraped off with a chamfering tool, there is no inconvenience as in Patent Document 1, but on the other hand, since three chamfering tools are provided, the chips become smaller and after chamfering work. Not only is it difficult to collect chips, but there is another problem that small chips may enter the pipe.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a tube end correcting tool capable of correcting a perfect circle of a tube end with a smaller force than before. It is also an object of the present invention to disclose a pipe end correction tool in which chips are not mixed into the pipe when chamfering by shaving the inner peripheral surface of the pipe end simultaneously with the correction of the perfect circle.

  In order to achieve the above-described object, the present invention is a tool for correcting deformation of a pipe end by turning a shaft member protruding in the direction of the rotation axis of the handle into the pipe end, and the shaft member is gradually moved from the tip. An introduction portion that expands in diameter, an annular enormous portion that is formed at the end of the introduction portion so as to have the maximum outer diameter of the shaft member, and that slidably contacts the inner peripheral surface of the pipe end to correct the deformation, and the annular portion A means is provided in which a conical portion that is positioned closer to the handle than the enormous portion and has a conical surface that can be inscribed in the receiving end of the tube end is provided coaxially. In this means, the leading introduction portion functions as a guide for smoothly guiding the annular enormous portion into the tube end. In the perfect circle restoration, only the annular enormous portion is in sliding contact with the inner periphery of the pipe end. Therefore, the friction area between the shaft member and the pipe end is small, and the shaft member can be turned in with a smaller force (torque) than in the past. Further, the conical portion enters the receiving end of the pipe end where the perfect circle restoration is completed by the annular enormous portion. Since the central axis of the conical part coincides with the central axis of the annular enlarging part, the pipe end is held in a state in which the centering is ensured by inserting the pipe body deeply until the conical part enters the receiving end of the pipe end. Further, when the conical portion enters the receiving end of the pipe end, the inner periphery of the receiving port is crushed and chamfering corresponding to the inclination angle of the conical portion can be performed.

  The outer diameter of the annular enlarging portion can be set larger than the true circular inner diameter of the pipe end, but it is preferable to set the outer diameter smaller than the true circular inner diameter of the pipe end. This is to reduce the frictional force between the shaft member (annular enormous portion) and the tube end while avoiding the diameter expansion deformation of the tube end, and to smoothly perform the perfect circle repair work with a smaller force. In this case, the tube end cannot be repaired to a perfect circle, but the tube end can be repaired to a shape that approximates a perfect circle.

  The shaft member can be formed by dividing an annular enormous portion and a conical portion, etc., and integrally connecting them, but by cutting a single bar, the introduction portion, the annular enlarging portion and the conical portion are formed. It is preferable to perform integral molding. This is because the manufacturing is easier than the above-described divided structure, and the center axes of the annular enormous portion and the conical portion can be accurately matched. The bar may be either synthetic resin or metal.

  The shaft member may be formed in a columnar shape, but it is preferable to provide two inclined flat surfaces facing each other beyond the enormous annular portion from the tip. This is because by providing the inclined flat surface, the outer shape of the annular enormous portion becomes two arcs, and the friction area with the pipe end can be further reduced.

  As described above, the conical portion can be chamfered on the inner periphery of the receiving end of the pipe end by a crushing action, but a part of the conical surface of the conical portion is notched and the edge of the notched portion is used for chamfering. It is preferable to use this byte. This is because the chamfered finish is better than the crushing by the conical portion.

  Although it is possible to provide chamfering tools at a plurality of locations on the conical portion, it is preferable that one be used. This is to prevent chips from being shredded and to make continuous large chips, thereby facilitating the collection of chips and preventing mixing into piping.

  According to the present invention, the annular enormous portion becomes the maximum outer diameter of the shaft member, and only the annular enlarging portion is in sliding contact with the inner periphery of the tube end to round the tube end. The pipe end can be repaired. In addition, since the conical portion whose center axis coincides with the annular bulge portion is provided on the base side (handle side) of the shaft member, the conical portion and the annular bulge portion are pushed by the conical portion while ensuring accurate centering. By crushing or chamfering tools, a beautiful chamfer can be applied to the inner periphery of the receiving end of the pipe end. Moreover, since the chamfering bit can be formed by cutting out a part of the conical portion, the tube end correcting tool of the present invention can be easily manufactured. Further, when one chamfering tool is used, it is possible to secure one continuous chip, and it is easy to collect the chip, and it is possible to prevent the chip from being mixed into the pipe.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an entire tube end correcting tool according to an embodiment of the present invention, which is provided with a shaft member 2 in the direction of the rotation axis of an appropriately shaped rotation handle 1. In this embodiment, the rear end of the shaft member 2 is inserted into an attachment hole provided in the central axis of the rotation handle 1 and fixed with screws 3.

  Furthermore, in further detail using FIG. 2 showing a perspective view of the main part of the tube end correction tool and FIG. 3 showing a front view of the shaft member 2, in this embodiment, the shaft member 2 is In order, it consists of the area | region of the introducing | transducing part 2a, the cyclic | annular enormous part 2b, the intermediate shaft part 2c, the constricted part 2d, the conical part 2e, and the attachment shaft part 2f.

  First, the introduction portion 2a is a portion that is first inserted into the pipe end, and functions as an insertion guide for the shaft member 2 by being formed in a truncated cone that gradually increases in diameter toward the handle side. The annular enormous portion 2b is a portion that is formed at the boundary between the introduction portion 2a and the intermediate shaft portion 2c and has the maximum outer diameter of the shaft member 2. Then, this annular enormous portion 2b is brought into sliding contact with the inner periphery of the tube end, and the tube end deformed into an ellipse or the like is restored to a perfect circle. In particular, in the present embodiment, the outer diameter of the annular enormous portion 2b is set to a small diameter of about 0.05 to 0.3 mm from the perfect circle inner diameter of the pipe end. While the pipe end is repaired with a certain degree, the insertion torque is reduced. The intermediate shaft portion 2c mainly determines the insertion depth of the annular bulge portion 2b, and also has a function of coaxially connecting the annular bulge portion 2b and a conical portion 2e described later via the constricted portion 2d. In particular, in the present embodiment, the intermediate shaft portion 2c is formed in a gentle conical shape that gradually decreases in diameter from the annular enormous portion 2b toward the constricted portion 2d, although it does not clearly appear in the drawing. The shape of the intermediate shaft portion 2c is not limited as long as the annular enlarged portion 2b and the conical portion 2e are connected coaxially.

  Next, the conical portion 2e is formed so as to increase in diameter toward the rear end, and the conical surface thereof can be inscribed in the receiving end of the tube end. Further, the conical portion 2e holds the tube end receiving surface in a state in which centering is ensured since the center axis coincides with the annular enormous portion 2b by the coaxial connection structure by the middle tube shaft portion 2c as described above. Further, as shown in FIG. 3, the conical portion 2e of this embodiment has a portion of the conical surface cut out in a range of 90 degrees along the axial direction, and the edge 2h in the cutout portion 2g is used for chamfering. It is used as a byte. Since the conical portion 2e secures the central axis of the tube end and is inscribed in the tube end receiving port as described above, the conical portion 2e can be chamfered in a shape corresponding to the inclination angle of the conical portion 2e. Note that the mounting shaft portion 2f functions as a fixed shaft for the handle 1 as described above.

  On the other hand, a circular groove 1a corresponding to the outer diameter of the tube end is formed on the end surface of the base end portion 1a of the handle 1 for fixing the shaft member 2, and the bottom of the circular groove 1b is used as a contact surface of the tube end. The shaft member 2 is inserted. Further, a window 1c communicating with the circular groove 1b is formed on the peripheral surface of the base end 1a of the handle 1 at a position corresponding to the edge 2h. This window 1c performs the effect | action which discharges | emits the chip cut by the chamfering bit (edge 2h) provided in the cone part 2e from the circular groove | channel 1b.

  According to the pipe end correcting tool having the above-described configuration, it is conventionally possible to repair the perfect circle of the pipe end and chamfer the inner peripheral surface of the pipe end receiving port by turning the shaft member 2 into the pipe end using the handle 1. However, since the perfect circle restoration is performed only in contact with the inner circumference of the tube end, the contact area is very small, and the perfect circle restoration can be performed with a smaller force than in the past. In addition, since the pipe ends are accurately centered at two locations, the annular enormous portion 2b and the conical portion 2e, which are in a coaxial relationship, it is possible to perform chamfering with a uniform wall thickness without deviation.

  FIG. 4 shows a modification of the shaft member 2 in which two inclined flat surfaces 4 are formed to face each other beyond the annular enormous portion 2b from the tip. According to this configuration, since the annular enormous portion 2b is formed by two arcs instead of one ring, the contact area with the inner periphery of the pipe end is further reduced, and the torque required for the rounding operation is further reduced. can do.

The whole figure of the tube end correction tool concerning one embodiment of the present invention. The perspective view which showed the principal part same as the above Same as above, front view of shaft member viewed from the tip in the axial direction The perspective view which showed the modification of the shaft member

Explanation of symbols

1 Handle 2 Shaft member 2b Enlarged portion 2e Conical portion 2h Edge (Chamfering tool)
3 screw 4 inclined plane

Claims (6)

A tool for correcting deformation of the pipe end by turning a shaft member protruding in the rotation axis direction of the handle into the pipe end. The shaft member includes an introduction portion that gradually increases in diameter from the tip, and the introduction portion of the introduction portion. An annular enormous portion that is formed at the end so as to have the maximum outer diameter of the shaft member and that is in sliding contact with the inner peripheral surface of the tube end to correct the deformation; And a conical portion having a conical surface that can be inscribed in the receiving port. The tube end correcting tool according to claim 1, wherein the annular enormous portion has an outer diameter set smaller than a perfect circular inner diameter of the tube end. The pipe end correction tool according to claim 1 or 2, wherein the shaft member is formed by integrally machining an introduction portion, an annular enormous portion, and a conical portion by cutting one bar. 4. The tube end correction tool according to claim 1, wherein the shaft member is further provided with two inclined planes facing each other beyond the annular enormous portion from the tip. The pipe end correction tool according to any one of claims 1 to 4, wherein a part of the conical surface of the conical portion is cut out, and an edge of the notched portion is used as a chamfering tool. 6. The tube end correcting tool according to claim 5, wherein there is one chamfering tool.

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