JP2022178484A - Marking jig - Google Patents

Abstract

To provide a marking jig facilitating the marking work of even a pipe having a coating material.SOLUTION: A marking jig 1 for marking combined pipes 29 and 30 having coating materials 23 and 25 with which outer peripherals of resin pipes 22 and 24 are coated, the coating materials capable of expanding/contracting in an axial direction, is equipped with first and second cylindrical portions 101 and 102 in which tip ends 28 of the resin pipes 22 and 24 are inserted, and an abutting portion 3 that abut-regulates an insertion position of the tip ends 28 of the resin pipes 22 and 24. At a position separated by a predetermined length from the abutting portion 3, a marking hole 11 penetrating the first and second cylindrical portions 101 and 102 is provided. On an outer surface of an end portion on a side where the resin pipes 22 and 24 are inserted in the first and second cylindrical portions 101 and 102, a collar portion 8 is provided. When the tip ends 28 of the resin pipes 22 and 24 are inserted in the first and second cylindrical portions 101 and 102, the collar portion 8 abuts on end surfaces of the coating materials 23 and 25, thereby pressing the coating materials 23 and 25.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking jig used in the work of connecting pipes constituting, for example, water supply pipes, hot water pipes, floor heating, road heating, etc., to joints or the like. More specifically, in the above operation, the length of the tube to be inserted into the joint is determined by accurately measuring and marking a position spaced a predetermined length from the tip of the tube for the purpose of preventing poor connection of the tube. The present invention relates to a marking jig that is configured so that it is possible to easily grasp the

Patent Literature 1 discloses a marking jig having a pipe insertion hole. The deep inner portion of the pipe insertion hole is provided with an abutment portion with which the tip of the pipe abuts. Since the contact portion is provided at a position spaced apart from the opening end of the pipe insertion hole by a predetermined length, marking the position of the opening end of the pipe insertion hole while the tip of the pipe is in contact with the contact portion , the length of the pipe to be inserted into the joint can be easily grasped.

Japanese Patent Application Laid-Open No. 2002-264044

2. Description of the Related Art Among pipes constituting water supply pipes and the like, there is a composite pipe in which the outer periphery of the pipe is covered with a resin coating material for protection and heat retention of the pipe. In such a composite pipe, the cladding material is pressed by hand and contracted in the axial direction, and the pipe is marked while the tip of the pipe is exposed. The marking jig of Patent Document 1 marks the position of the opening end of the pipe insertion hole. Therefore, marking is performed while the covering material is pressed by hand so that the pipe is exposed between the opening end of the pipe insertion hole and the end surface of the covering material.

However, the operation of holding the coating material by hand, the operation of holding the marking jig to the pipe, and the marking operation must be performed simultaneously, which makes the operation complicated and difficult.
SUMMARY OF THE INVENTION An object of the present invention is to provide a marking jig that facilitates marking work even for a composite pipe having a covering material.

In order to achieve the above object, the invention of claim 1 provides a composite pipe having a pipe and a coating material covering the outer periphery of the pipe and capable of expanding and contracting in the axial direction. A marking jig used for marking a pipe, comprising: a cylindrical portion into which a tip of a tube is inserted; and an abutting portion provided in the cylindrical portion that abuts and defines an insertion position of the tip of the tube. a marking groove provided at a position spaced apart from the contact portion by the predetermined length and penetrating the tubular portion; When the tip of the tube is inserted into the tubular portion, the collar portion abuts the end face of the covering material to hold down the covering material.

According to the above configuration, when the distal end of the tube is inserted into the cylindrical portion, the collar presses the covering material, so that the tube is exposed at the position of the marking groove penetrating the cylindrical portion. Therefore, the tip of the pipe can be exposed from the covering material by the marking jig without pressing the covering material by hand, and the marking operation is facilitated even for the composite pipe having the covering material.

FIG. 2 is a perspective view of a marking jig; The front view of the jig for marking. The back view of the jig for marking. The left side view of the jig for marking. The right side view of the jig for marking. The top view of the jig for marking. The bottom view of the jig for marking. The figure for demonstrating the usage method of the jig|tool for marking. FIG. 2 is a vertical cross-sectional view of a marking jig; FIG. 2 is a vertical cross-sectional view of a marking jig; FIG. 4 is a vertical cross-sectional view showing a one-touch joint in which a pipe is inserted;

Embodiments embodying the present invention will be described below with reference to the drawings. Before describing the marking jig in detail, the resin pipe marked with the marking jig and the one-touch joint to which the resin pipe is connected will be described.

As shown in FIG. 11, the composite pipe 29 is used, for example, as a water supply/hot water supply pipe, and has a resin pipe 22 and a covering material 23 covering the outer circumference of the resin pipe 22 . The resin pipe 22 is made of a synthetic resin material such as crosslinked polyethylene or polybutene. The covering material 23 is made of a synthetic resin material such as polyethylene, and has a bellows shape in which large-diameter portions and small-diameter portions are alternately provided in the axial direction (horizontal direction in FIG. 11). Expansion and contraction is possible. In order to insert the resin pipe 22 into the one-touch joint 20, the tip of the resin pipe 22 is exposed from the covering material by contracting the covering material 23 in the axial direction.

A cross-shaped mark 16 is drawn with a marker on the outer peripheral surface of the resin pipe 22 at a position a predetermined distance away from the tip 28 of the resin pipe 22 in the axial direction (horizontal direction in FIG. 11). The mark 16 has a circumferential line 14 extending in the circumferential direction of the resin pipe 22 and an axial line 15 extending in the axial direction of the resin pipe 22 . The operator can insert the resin pipe 22 into the one-touch joint 20 to an appropriate depth and connect by performing the work using the circumferential line 14 of the mark 16 as a guide.

Here, the size (nominal diameter) of the resin pipe 22 is "13A (outer diameter 17 mm, inner diameter 12.8 mm)". In this embodiment, in addition to the resin pipe 22, a resin pipe 24 having a nominal diameter of "16A (outer diameter: 21.5 mm, inner diameter: 16.2 mm)" is used. The composite pipe 30 has a resin pipe 24 and a covering material 25 covering the outer periphery of the resin pipe 24 .

The resin pipes 22 and 24 are different from each other only in size, and have the same configuration in other respects. When there is no particular need to distinguish and explain, only the resin pipe 22 will be explained, and repeated explanation will be omitted. Needless to say, the push-in joints 20 are separately available in sizes individually corresponding to the resin pipes 22 and 24 of each size.

An inner core 60 is inserted into the distal end 28 of the resin pipe 22 . The inner core 60 has a cylindrical portion 61 and an annular collar portion 62 extending outward from one end of the cylindrical portion 61 so as to be perpendicular to the cylindrical portion 61 . The in-core 60 is made of metal material such as brass or bronze. The outer peripheral surface of the other end of the cylindrical portion 61 is formed with a tapered surface 63 whose diameter decreases toward the tip.

The one-touch joint 20 has a substantially cylindrical main body 31 and a push ring 41 . The main body 31 and the push ring 41 are each made of a metal material such as brass or bronze. A male threaded portion 32 is formed on the outer peripheral surface of one end of the main body 31 so that it can be screwed into a tubular body such as a water pipe (not shown). A female threaded portion 36 is formed on the outer peripheral surface of the other end of the main body 31, and a male threaded portion 42 of a push ring 41 is screwed thereon. An insertion hole 43 is formed in the push ring 41 . The resin pipe 22 is inserted into the one-touch joint 20 through the insertion hole 43 .

An annular contact surface 33 centered on the axis of the main body 31 is formed on the inner peripheral surface of the main body 31 on a plane perpendicular to the axis of the main body 31 . The resin pipe 22 inserted into the one-touch joint 20 contacts the contact surface 33 with the distal end surface of the collar portion 62 of the inner core 60, thereby defining the insertion position of the distal end 28 into the one-touch joint 20. there is In this state, the circumferential direction line 14 of the mark 16 and the opening end face of the insertion hole 43 of the push ring 41 are at substantially the same position in the axial direction. By visually confirming this, the operator determines that the resin pipe 22 is inserted into the one-touch joint 20 to an appropriate depth.

Annular grooves 34 and 35 are formed in the inner peripheral surface of the main body 31 . Seal rings 51 and 52 having a circular cross section are housed in the annular grooves 34 and 35, respectively. The seal rings 51 and 52 press the annular region of the outer peripheral surface of the resin pipe 22 inserted into the one-touch joint 20 . Therefore, the seal rings 51 and 52 seal between the inner peripheral surface of the main body 31 and the outer peripheral surface of the resin pipe 22, and the sealing performance inside the one-touch joint 20 is ensured.

Lock rings 53 and 55 are arranged between the main body 31 and the push ring 41 . The resin pipe 22 inserted into the one-touch joint 20 is prevented from coming off from the one-touch joint 20 by the lock rings 53 and 55 biting into the outer peripheral surface of the resin pipe 22 .

Next, the marking jig of this embodiment will be described.
As shown in FIGS. 1 to 3, the marking jig 1 includes a first tubular portion 101 for drawing marks 16 on the resin pipe 22 and a first cylindrical portion 101 for drawing marks 16 on the resin pipe 24. The second tubular portion 102 used for the above is integrally molded from a synthetic resin material such as polypropylene.

By integrating the first and second tubular portions 101 and 102 so as to correspond to the resin pipes 22 and 24 of a plurality of sizes (two in this embodiment), for example, each size is separated. There is no need to worry about carrying multiple small marking jigs or losing them.

Each of the first and second cylindrical portions 101 and 102 has a bottomed cylindrical shape. The inner diameters of the first and second tubular portions 101 and 102 are set according to the outer diameters of the corresponding resin pipes 22 and 24 . The outer diameters of the first and second cylindrical portions 101 and 102 are also set to be different according to the difference in inner diameter.

As shown in FIGS. 1 to 5, a first tubular portion 101 and a second tubular portion 102 having an outer diameter larger than that of the first tubular portion 101 are arranged in parallel so that their axes are parallel to each other. ing. The distance between the axes of the first tubular portion 101 and the second tubular portion 102 is smaller than the sum of the radius of the first tubular portion 101 and the radius of the second tubular portion 102 . The internal space of the first tubular portion 101 and the internal space of the second tubular portion 102 partially overlap and communicate with each other. By forming the first tubular portion 101 and the second tubular portion 102 so as to share a part of the internal space, even if it corresponds to a plurality of sizes, the height direction (up and down in FIG. 2) direction) can be shortened, and the marking jig 1 is excellent in portability and workability.

As shown in FIG. 2 , the central axis L of the first tubular portion 101 is positioned outside the internal space of the second tubular portion 102 . When viewed from the front, the width of the communicating portion between the first cylindrical portion 101 and the second cylindrical portion 102 is narrower than the outer diameter of the resin pipe 22 . Therefore, it is possible to prevent the resin pipe 22 inserted into the first tubular portion 101 from being displaced toward the second tubular portion 102 , and the marking jig 1 can be stably attached to the resin pipe 22 .

As shown in FIGS. 4 and 5, a strap attachment portion 13 is axially protruding from the outer bottom surface of the first tubular portion 101 . A strap hole 13a is formed through the strap attachment portion 13 in the radial direction (the front and back directions of the paper surface of FIG. 4). Therefore, by attaching a strap (not shown) to the strap hole 13a and connecting the strap to, for example, a belt hole (not shown) of the operator's trousers, the marking jig 1 can be carried more conveniently.

As shown in FIG. 1, a display portion 9 is provided on the outer peripheral surfaces of the first and second tubular portions 101 and 102 . The display unit 9 displays the size (“16A”) of the corresponding resin pipe 24, an arrow indicating the marking position (marking hole 11), characters “mark” and “position”, and “kakuninmad” indicating the confirmation window 5. characters are displayed. Note that the size (“13A”) of the corresponding resin pipe 22 and an arrow indicating the marking position are displayed on the display portion 9 of the first cylindrical portion 101, and characters indicating the marking position and the confirmation window 5 are displayed. No characters are displayed.

Next, the marking function and the oblique cutting determination function of the marking jig 1 will be described in detail. In addition, since the first and second cylindrical portions 101 and 102 have the same configuration for each function, if there is no need to distinguish them in particular, the resin pipe with a nominal diameter of "16A" Only the second cylindrical portion 102 corresponding to 24 will be described, and repeated description will be omitted.

As shown in FIGS. 2 and 9, the contact portion 3 is set on the inner bottom surface of the second tubular portion 102 . The tip 28 of the resin pipe 24 inserted into the second tubular portion 102 is brought into contact with the contact portion 3 . This abutment defines the insertion position of the tip 28 of the resin pipe 24 with respect to the second tubular portion 102 .

A plurality of (four in this embodiment) convex portions 10 are formed at equal intervals in the circumferential direction on the inner peripheral surface of the second cylindrical portion 102 . The convex portion 10 provides an appropriate amount of interference with respect to the outer peripheral surface of the resin pipe 24, thereby facilitating the insertion of the resin pipe 24 into the second cylindrical portion 102, and the insertion of the resin pipe 24 into the second cylindrical portion. It is compatible with preventing easy escape from 102 . Two of the four projections 10 of the first tubular portion 101 are arranged at the boundary between the first tubular portion 101 and the second tubular portion 102 . The two protrusions 10 can prevent the resin pipe 22 inserted into the first tubular portion 101 from being displaced toward the second tubular portion 102 .

As shown in FIG. 6, the second tubular portion 102 is provided with a confirmation window 5 having a rectangular shape in plan view. The confirmation window 5 is open on the outer surface of the second cylindrical portion 102 and is formed to penetrate to the inner space of the second cylindrical portion 102 . The confirmation window 5 is provided at a position where the contact portion 3 can be easily visually recognized from the outside. Therefore, the operator can easily check the state of contact between the tip 28 of the resin pipe 24 inserted into the second tubular portion 102 and the contact portion 3 through the confirmation window 5 .

As shown in FIGS. 4 to 6, the second tubular portion 102 is formed with a cross-shaped marking hole 11 penetrating in the radial direction of the second tubular portion 102 . The marking hole 11 has an axial groove 17 that extends linearly in the axial direction from the vicinity of the open end of the second cylindrical portion 102, and a circumferential groove 18 that intersects the axial groove at right angles and extends in the circumferential direction. . The circumferential groove 18 is provided at a position separated from the contact portion 3 by a predetermined distance (insertion depth into a one-touch joint having a size corresponding to the resin pipe 24). As shown in FIG. 8 , when the resin pipe 24 is inserted into the second tubular portion 102 , part of the outer peripheral surface of the resin pipe 24 is exposed to the outside through the marking hole 11 .

In order to apply the mark 16 to the resin pipe 24 using the marking jig 1 , the resin pipe 24 is inserted into the second cylindrical portion 102 of the marking jig 1 that corresponds in size. Then, in a state where the tip 28 of the resin pipe 24 is in contact with the contact portion 3 , the circumferential line 14 is drawn by moving the marker in the circumferential direction along the circumferential groove 18 . An axial line 15 is also drawn by moving the marker axially along the axial groove 17 .

As described above, the circumferential line 14 of the mark 16 allows the operator to confirm that the resin pipe 24 is inserted and connected to the one-touch joint 20 (having a size corresponding to the resin pipe 24) at an appropriate depth. It is a mark for doing. On the other hand, the axial line 15 of the mark 16, more specifically, the portion of the push-in joint 20 along the axial line 15 can be removed by the operator without using the marking jig 1. This is for the supervisor to check later whether connection work with

That is, when the mark 16 is only the circumferential line 14, the operator can feel the resin pipe 24 and the push-in joint 20 without using the marking jig 1, in other words, without drawing the circumferential line 14. It is conceivable that the connection is made by relying only on the wire, and after the connection work, the circumferential line 14 is drawn for convenience to deceive the supervisor. However, since the portion where the axial line 15 is drawn on the outer peripheral surface of the resin pipe 24 is hidden after the connection work, the axial line 15 is drawn before the connection work, unlike the circumferential line 14 . I have to draw.

That is, the supervisor can see the axial line 15 faintly in the back through a narrow gap near the insertion hole 43 of the one-touch joint 20 in which the resin pipe 24 is inserted and connected. It is assumed that the drawing operation was performed before the connecting operation, and that the circumferential line 14 would have been drawn using the marking jig 1 as agreed upon.

Now, as shown in FIG. 6, the second tubular portion 102 is provided with the reference mark 7 . The reference mark 7 is used to determine whether or not the tip 28 of the resin pipe 24 visible through the confirmation window 5 is excessively obliquely cut, based on the relative positional relationship with the outer peripheral edge of the end face of the tip 28. belongs to. The reference mark 7 is provided by forming steps in the axial direction (vertical direction in FIG. 6) on both wall surfaces located in the circumferential direction (left-right direction in FIG. 6) on the inner surface of the confirmation window 5. there is

Therefore, in a state in which the tip 28 of the resin pipe 24 and the contact portion 3 are in contact with each other, the outer peripheral edge of the end face of the tip 28 and the reference mark 7 can be confirmed by checking the contact portion through the confirmation window 5 . , it can be determined whether or not the tip 28 of the resin pipe 24 is cut excessively.

As shown in FIGS. 1 to 3, the marking jig 1 is provided with an annular flange 8 on the outer peripheral surface of the end on the open end side. The collar portion 8 is for pressing the covering material 25 and exposing the tip 28 of the resin pipe 24 when the marking jig 1 is attached to the composite pipe 30 . The collar portion 8 extends outward so as to be orthogonal to the first and second cylindrical portions 101 and 102 . As shown in FIG. 9, the portion of the collar portion 8 corresponding to the second cylindrical portion 102 extends outward beyond the outer diameter of the covering material 25 of the composite pipe 30 to which the marking jig 1 is attached. The inner diameter of the portion of the second tubular portion 102 corresponding to the collar portion 8 is smaller than the outer diameter of the covering material 25 .

In order to attach the marking jig 1 to the composite pipe 30 having the resin pipe 24 with a nominal diameter of "16A", the end surface of the covering material 25 and the collar portion 8 of the marking jig 1 are brought into contact with each other. , the tip 28 of the resin pipe 24 is inserted into the second tubular portion 102 . As shown in FIGS. 8 and 9, since the end surface of the covering material 25 is in contact with the flange portion 8, the covering material 25 is axially contracted as the resin pipe 24 is inserted. The portion arranged inside the second cylindrical portion 102 is exposed from the covering material 25 . Therefore, the portion corresponding to the position of the marking hole 11 on the outer peripheral surface of the resin pipe 24 can be exposed without the need to hold down the covering material 25 by hand. To attach the marking jig to the composite pipe 29 having the resin pipe 22 with a nominal diameter of "13A", the tip 28 of the resin pipe 22 is inserted into the first tubular portion 101 in the same manner.

Since the collar part 8 extends to the outside of the covering material 25 of the composite pipe 30 , it is possible to prevent the collar part 8 from entering the inside of the covering material 25 when pressing the end face of the covering material 25 . In addition, since the inner diameter of the portion of the second tubular portion 102 corresponding to the collar portion 8 is smaller than the outer diameter of the covering material 25 , it is possible to prevent the covering material 25 from entering the inside of the second tubular portion 102 . Therefore, the end face of the covering material 25 can be pressed entirely except for the side of the first cylindrical portion 101, and the covering material 25 can be stably contracted in the axial direction.

When the covering material 25 is contracted in the axial direction by the collar portion 8 , the marking jig 1 is pushed in the direction of coming out of the resin pipe 24 by the elastic restoring force of the covering material 25 . Here, since the convex portion 10 on the inner peripheral surface of the second tubular portion 102 provides an appropriate amount of interference with respect to the outer peripheral surface of the resin pipe 24, the marking jig 1 does not slip out of the resin pipe 24. can be suppressed. Therefore, it is not necessary to manually hold the marking jig 1 against the composite pipe 30 .

As shown in FIG. 2 , a concave portion 12 is formed on the outer peripheral surface of the flange portion 8 . A through hole 19 is formed in the bottom surface of the second tubular portion 102 . The through hole 19 is not formed in the bottom surface of the first cylindrical portion.

A portion of the marker can be accommodated inside the second tubular portion 102 so as to pass through the through hole 19 . By hooking the clip portion of the marker on the collar portion 8 via the recess 12 in the accommodated state, the marker can be stably held on the marking jig 1 and the marker is less likely to fall off the marking jig 1. ing. Thus, the marking jig 1 can be handled integrally with the marker, which is convenient for carrying and storing.

As shown in FIGS. 6 and 7 , the concave portion 12 is provided on the outer peripheral surface of the collar portion 8 at a position corresponding to the axial groove 17 of the marking hole 11 . As a result, when drawing the axial line 15 at the end of the axial groove 17 on the flange 8 side, the marker can be prevented from interfering with the flange 8, and the tip of the marker can be inserted to the end of the axial groove 17. be able to.

As shown in FIGS. 4 and 6, the marking hole 11 is chamfered at the corner 11a formed by the outer peripheral surface of the second tubular portion 102 and the inner peripheral surface of the marking hole 11. As shown in FIGS. Therefore, when making the mark 16 along the marking hole 11 , interference between the marker and the second cylindrical portion 102 can be suppressed, and the tip of the marker can be easily inserted into the marking hole 11 .

<Modification>
In addition, the present invention can also be implemented, for example, in the following aspects.
○ There should be only one cylindrical part, and it should be dedicated to one size of composite pipe.

(circle) arrange|position the 1st cylindrical part 101 and the 2nd cylindrical part 102 so that each open end may face an opposite side mutually. In this case, the position where the tip of the resin pipe 22 is inserted is separated from the position where the tip of the resin pipe 24 is inserted. It is possible to prevent misalignment and insertion into the second cylindrical portion 102 having a different compatible size.

○ Other composite pipes include those covered with a foamed heat insulating material.

REFERENCE SIGNS LIST 1 marking jig, 3 abutment portion, 8 collar portion, 11 marking hole, 22, 24 resin pipe as pipe, 23, 25 covering material, 29, 30 composite pipe, 101 second 1 cylindrical part, 102... 2nd cylindrical part.

Claims (1)

A marking jig used for marking a position spaced apart by a predetermined length from the tip of a composite pipe having a pipe and a coating material that covers the outer periphery of the pipe and is stretchable in the axial direction,
a cylindrical portion into which the tip of the tube is inserted;
an abutting portion provided in the cylindrical portion for abutting and defining an insertion position of the tip of the tube;
a marking hole provided at a position spaced apart from the contact portion by the predetermined length and penetrating the cylindrical portion;
a brim provided on the outer surface of the end of the tubular portion into which the tip of the tube is inserted;
A jig for marking that presses the covering material by bringing the flange into contact with the end face of the covering material when the tip of the tube is inserted into the cylindrical part.

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