JP2010023219A - Attachment tool of core for pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple tool for driving a core onto a water pipe. <P>SOLUTION: The attachment tool of the core for pipe fitting is constituted by projectingly providing a cylindrical core retaining part having an outer diameter of approximately the same diameter as an inner diameter of the core on the same axis of one end surface of a tool body having predetermined length. A method is adopted, that the core is retained to the core retaining part and is inserted to a pipe end, and the other end surface of the tool body is hit to attach the core to a pipe end part. Further, a means that an end surface shape of the tool body is circular or regular polygonal is adopted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tool capable of easily and reliably mounting a core to be mounted on an end surface of a water distribution pipe when a mechanical joint is connected to a water distribution pipe or the like.

  When a general mechanical joint is used for a water distribution pipe, it is necessary to attach a metal core having a tapered outer peripheral surface to the end of the pipe in order to prevent sealing and slipping out. As shown in FIG. 3, the mounting operation is normally performed by driving the core (C) into the inner diameter of the pipe (P) with a plastic hammer (H). FIG. 4A is a cross-sectional view in the middle of driving, and FIG. Further, for example, there is a description related to paragraph numbers [0002] to [0005] of Patent Document 1.

JP-A-11-94155

  On the other hand, in recent years, high-density polyethylene water distribution pipes have been used as polyethylene pipes for water distribution. Since this high-density polyethylene water distribution pipe is very hard compared to conventional water distribution pipes, it is difficult to drive a metal core. For example, when the taper portion size of the core is reduced, the workability is improved, but conversely, the sealing performance and the slip-out prevention performance are deteriorated.

  Also, the core has a cylindrical shape with a tapered outer periphery as shown in FIG. 3 to ensure a water passage diameter, and the center of the core cannot be hit with a hammer, so no force is applied evenly. . Therefore, the core may be deformed. Furthermore, if the force is not applied evenly, the entire core will be tilted with respect to the tube axis, so care must be taken such as alternately driving the top, bottom, left and right of the peripheral end surface of the core. In such a case, the inner surface of the pipe may be damaged (see FIG. 1A).

  In view of such circumstances, the present invention aims to improve work efficiency and workability by driving a core using a tool having a simple configuration.

  In order to solve the above-described problems, the present invention provides a tube-shaped core holding portion having an outer diameter that is substantially the same as the inner diameter of the core on the same axis as one end face of a tool body having a predetermined length. A fitting tool for the joint core was constructed, and a means was adopted in which the core was held in the core holding part and inserted into the pipe end, and the other end face of the tool body was hit to attach the core to the pipe end part.

  Since the outer diameter of the core holding portion is substantially the same as the inner diameter of the core, the core holding portion is securely held and the core is easily driven in the coaxial direction.

  Moreover, the means that the end surface shape of a tool main body is circular or a regular polygon was employ | adopted.

  Since the mounting tool having the above configuration is configured such that the core is fitted to the core holding portion and the other end surface of the tool body is struck, the striking force is evenly applied to the core, and the water distribution pipe end is uniformly expanded. It can be advanced and attached to the end. Therefore, unlike the conventional case, it is not necessary to drive the peripheral end surface of the core alternately up and down and left and right, and the workability is remarkably improved. In addition, since the shaft does not tilt, the inner surface of the tube is not damaged by the core.

  In addition, the end face shape of the tool body is circular or regular polygonal, and the core holding part protrudes on the same axis, and the peripheral end face of the held core and the tool end face are in contact with each other. Even so, it is an excellent invention in which the force is transmitted evenly and the core is not deformed.

  Hereinafter, preferred embodiments of a fitting tool for a pipe joint core according to the present invention will be described with reference to the drawings. FIG. 1A is an overall perspective view of the present mounting tool, and FIG. 1B is an explanatory diagram showing an example of its use. 2A is a cross-sectional view in the middle of mounting, and FIG. 2B is an explanatory cross-sectional view in a state in which the joint is fastened after mounting.

  In the figure, reference numeral 1 denotes a main mounting tool, and a cylindrical core holding portion 1b having a diameter smaller than the diameter of the tool body 1a is coaxially formed on one end surface of a tool body 1a formed of a cylinder having a predetermined length. It protrudes above. The diameter of the core holding portion 1b is substantially the same as the inner diameter of the target core (C). The protruding length is slightly shorter than the total length of the core (C).

  In addition, although the said core holding | maintenance part 1b needs to be cylindrical shape in order to hold | maintain a core (C), the tool main body 1a does not necessarily need to be cylindrical. However, as described below, in order for the striking force to act evenly, it is preferably a rotationally symmetric shape coaxial with the axis of the core holding portion 1b, and the shape of the end surface thereof is a circle or a regular polygon. It is preferable.

  Moreover, the material which comprises this mounting tool is not specifically limited. For example, it may be configured by cutting a metal column, or may be integrally formed of hard plastic or the like. However, since the end surface is hit with a hammer as described below, it is desirable that the material be able to withstand the impact.

  When this mounting tool 1 is used, the core (C) is fitted into the core holding portion 1b. At this time, the peripheral end surface of the core (C) is surely in contact with the end surface of the tool body 1a. Since the inner diameter of the core and the outer diameter of the core holding part are substantially the same, the core (C) is reliably held by the core holding part 1b. In this state, as shown in FIG. 2A, the mounting tool 1 holding the core (C) together with the water distribution pipe (H) and the shaft is inserted into the pipe end. Then, the other end surface of the tool body 1a is hit with a plastic hammer (see FIG. 1 (B)), and the core (C) is gradually attached to the end of the pipe. At this time, by hitting the other end face of the tool body 1a accurately in the axial direction, a force is evenly applied to the peripheral end face of the core (C), and the core (C) is not tilted while expanding the pipe end. Installed securely.

  In this case, it should be noted that a cap nut (N) and a chuck ring (R) of a mechanical joint are inserted into the water distribution pipe (H) in advance before the core (C) is mounted. This is because the pipe end diameter is increased by mounting the core (C), so that it is difficult to insert the cap nut (N) and the chuck ring (R) later.

  If the water distribution pipe (P) with the core (C) attached as described above is inserted into the joint body (J) and the cap nut (N) is tightened, the chuck ring (R) is reduced in diameter on the inner surface. Then, the pipe end between the core (C) and the chuck ring (R) is securely clamped, and a joint that does not easily come off is completed (see FIG. 2B).

  In this way, the core is fitted to the mounting tool, and the center of the end surface is struck with a hammer. There is no need to drive in, workability is improved, and the inner surface of the pipe is not damaged. In addition, since the peripheral end surface of the core and the end surface of the tool are in contact with each other, even if a strong impact is applied, the core is hardly deformed because a force is applied evenly to the core.

(A) is the whole perspective view of the mounting tool which concerns on this invention, (B) is explanatory drawing which shows the usage example. (A) is sectional drawing in the middle of mounting | wearing, (B) is explanatory sectional drawing of the state which fastened the joint after mounting | wearing. In the case of mounting a conventional core, (A) is a sectional view in the middle of driving, and (B) is an explanatory perspective view.

Explanation of symbols

1 Installation tool 1a Tool body 1b Core holding part

Claims (3)

  A cylindrical core holding part having an outer diameter substantially the same as the inner diameter of the core is projected on the same axis of one end surface of the tool body of a predetermined length, and the core is held by the core holding part. A fitting tool for a pipe joint core, which is inserted into a pipe end and hits the other end face of the tool body to attach the core to the pipe end.   The fitting tool for a pipe joint core according to claim 1, wherein the end surface of the tool body is circular.   The fitting tool for a pipe joint core according to claim 1, wherein the end face shape of the tool body is a regular polygon.

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