JP5275824B2 - Fitting - Google Patents

Description

  The present invention relates to a joint, and more particularly to a joint used when a water meter is replaced with a water meter having a different screw type.

  The validity period of water meters is determined by law and must be replaced after a certain period of time. As described above, the present invention relates to a joint used when replacing a previously installed water meter with a water meter having a different screw type. First, referring to FIG. The connection structure of a water meter and piping, and the replacement method of a water meter are demonstrated. FIG. 1 shows a connection structure between a water meter and a primary side and a secondary side pipe in a conventional example, and only a connection portion is shown in cross section. In the figure, a water meter 1 is located at the center, and connection thread portions 3 are provided at both ends of the primary side and the secondary side.

  First, the connection structure on the primary side of the water meter 1 will be described. On the primary side of the water meter 1, a joint 5 and a stop cock 19 are arranged. The joint 5 includes a joint nut 7, a joint pipe 11, and a cap nut 15. The joint nut 7 is attached to the primary side of the cylindrical joint pipe 11 in a state of being prevented from being removed via a washer 9, while the cap nut 15 is secured to the secondary side of the joint pipe 11. A screw of the same kind as that of the screw portion 3 attached to the primary end of the water meter 1 is formed. In the joint 5, the joint nut 7 is formed on the secondary side end portion 23 of the water stopcock 19 with a part of the joint pipe 11 received in the secondary side end portion 23 of the water stopcock 19. By connecting with a screw, the water stopcock 19 is connected. The joint 5 is connected to the water meter 1 by screwing the cap nut 15 with the screw portion 3 on the primary side of the water meter 1. Reference numeral 13 is an O-ring which is disposed on the outer periphery of the primary side of the joint pipe 11 and seals between the secondary end 23 of the water stop cock 19 and the joint pipe 11. Reference numeral 17 denotes the joint pipe 9. And a packing disposed between the end faces of the primary end of the water meter 1.

  The water stop cock 19 is a well-known thing, and description about a specific structure is abbreviate | omitted. A primary side pipe (not shown) is connected to the primary side end 21 of the water stop cock 19. Thus, the water meter 1 is connected to and communicates with a primary side pipe (not shown) via the joint 5 and the water stop cock 19.

  Next, the connection structure on the secondary side of the water meter 1 will be described. A cylindrical shimoku 25 is disposed on the secondary side of the water meter 1. A cap nut 27 is attached to the primary side of the shimoku 25 so as to be prevented by a flange portion 29 provided at the end thereof. The cap nut 27 is provided at the secondary end of the water meter 1. A screw of the same type as the screw portion 3 is formed. On the other hand, a taper screw portion 31 is formed at the secondary side end portion of the shimoku 25.

  A secondary pipe (not shown) such as a steel pipe, a vinyl chloride pipe, a flexible pipe or the like is attached to the taper thread portion 31 of the shimok 25. Then, the water meter 1 is connected to and communicates with the secondary side pipe through the shimoku 25 by screwing the cap nut 27 of the shimoku 25 to the screw part 3 at the secondary side end of the water meter 1. It becomes. In addition, the code | symbol 33 is the packing arrange | positioned between the secondary side edge part of the water meter 1, and the end surface of the shimoku 25. FIG.

  When replacing the water meter 1, after closing the stop cock 19, the screw nut 3 of the joint 5 and the cap nut 27 of the shimok 25 are respectively connected to the primary and secondary end portions of the water meter 1. Loosen and remove, and move backward away from the water meter 1. As a result, the water meter 1 is disengaged from the joint 5 and the shimoku 25, so the water meter 1 that has been installed is removed and replaced with a new one. The installation of a new water meter 1 is the reverse of the removal operation. That is, with the new water meter 1 placed at a predetermined position, the cap nut 15 of the joint 5 and the cap nut 27 of the shimok 25 are advanced toward the water meter 1. Then, the cap nut 15 of the joint 5 and the cap nut 27 of the shimok 25 are respectively rotated with respect to the water meter 1 and screwed into the primary and secondary screw portions 3 of the water meter 1.

  The replacement of the water meter is performed according to the above procedure, but the water meter to be used has been determined in advance by the water utility, and the water meter newly installed at the time of replacement was the same screw type. . However, due to recent deregulation, there is a demand for the removal of restrictions on the types of water meters used. In addition, due to the merger of local governments, an area that originally used a water meter with a different screw type may be under the jurisdiction of one water utility, and it is convenient if it can be replaced with a water meter with a different screw type. In such a case, naturally, the cap nut used in the existing joint and shimoku and the new water meter cannot be screwed together.

Utility Model Registration No. 3050443

  Accordingly, when the water meter 1 to be newly installed has different types of screws from the cap nut 15 of the existing joint 5 and the cap nut 27 of the shimok 25, the cap nut of the joint 5 and the shimok 25 is combined with the replacement of the water meter 1. It is necessary to replace 15 and 27 anew. The replacement on the primary side is relatively simple because the joint 5 is pulled out once and the joint 5 having the cap nut 15 corresponding to the new water meter is attached. However, the work on the secondary side is not as easy as the primary side. For example, when the secondary side pipe is a steel pipe, the shimok 25 is temporarily removed from the steel pipe, and the cap nut 27 must be replaced with a screw having a new water meter, and the shimoku 25 must be attached to the steel pipe again. . At this time, a taper screw is used as a screw between the steel pipe and the shimok 25, and usually a leakage prevention process is performed. Therefore, it is difficult to disengage, and it is necessary to perform leakage prevention processing again after replacement. Further, in the case of a PVC pipe or a flexible pipe, it is difficult to replace only the cap nut 27 because the pipe is integrated with the shimok 25 by adhesion or caulking. Therefore, in the case of a PVC pipe, it is necessary to cut the PVC pipe at an appropriate location, and in the case of a flexible pipe, it is necessary to replace the entire pipe together with the shimoku 25. In this case, excavation work is involved, so that the replacement work becomes complicated, and much time and cost are required.

  The present invention has been made paying attention to such problems in the prior art. The purpose is to provide a joint that allows easy and quick installation of the water meter when the water meter is replaced with a water meter of a different screw type.

In order to solve the above problems, the present invention is a joint used for replacement mounting of different types of screw water meters with different screw specifications, and is formed integrally with the nut portion on one side in the axial direction of the nut portion. A fitting body with a mounting portion is provided, and the mounting portion is passed through the screw hole of the nut portion, and attached to the water pipe that has already been installed. It has a void portion that can receive at least the upstream portion of the shimok that is located on the water meter side, and the void portion has an opening through which the shimoku that is open on one side in a direction substantially perpendicular to the axial direction of the nut portion can pass A locking portion that engages with an outer flange formed at the upstream end of the shimok and restricts the movement of the shimok in a direction away from the nut portion, and the joint further includes a shimok radially outward Move to Was configured with a retaining means to prevent the escape from the cavity portion Te.
Furthermore, in the cross section in the plane substantially orthogonal to the axial direction of the nut portion, the void portion is parallel to the receiving portion whose inner periphery is substantially semicircular and the direction substantially orthogonal to the axial direction of the nut portion from the receiving portion And a pair of arm portions extending to the end, and the shimok can be moved to the receiving portion through between the end portions of the arm portions.
Further, the retaining means is constituted by a hole formed in each of the pair of arm portions, and a shaft member inserted through the hole and fixed to the arm portion.
Further, the arm portion is cut out over a predetermined length range in a direction substantially perpendicular to the axial direction of the nut portion from the tip of the arm portion over a predetermined length range of a portion adjacent to the nut portion. It was set as the structure by which the flange of Shimoku was received by the receiving part corresponding to the missing part.
Further, a male screw is formed on the outer periphery of the mounting portion, and the male screw is screwed into a nut attached to the shimoku to constitute a retaining means.
Further, the void portion includes a large-diameter portion that receives the flange of the shimok, and a small-diameter portion that is formed subsequently and receives the remaining portion of the upstream portion of the shimok, and the locking portion is a large-diameter portion And a shoulder formed between the small diameter portion and the small diameter portion.

  According to the present invention, when the pipe is a steel pipe, it is not necessary to disconnect and reattach the shimok to the steel pipe, and in the case of a PVC pipe and a flexible pipe, it is not necessary to dig and replace the shimok. It is possible to easily and quickly attach water meters with different types of screws.

Schematic which shows the connection state of the water meter and primary side and secondary side piping in a prior art example. BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the connection structure of a water meter and a primary side and secondary side piping including the coupling which concerns on 1st embodiment of this invention. The front side sectional view of the joint 41. FIG. The top view of the coupling 41. FIG. The left view of the coupling 41. FIG. The right side drawing of the coupling 41. The perspective view which shows the state before attachment of the coupling 41 and the shimok 25. FIG. The perspective view which shows the state during attachment of the coupling 41 and the shimok 25. FIG. The perspective view which shows the state after attachment of the coupling 41 and the shimok 25. FIG. Sectional drawing of the attachment state of the joint 41 and the shimok 25. FIG. The partial enlarged view which shows the connection state of the water meter 1, the shimok 25, and the coupling 41. FIG.

  Hereinafter, a first embodiment of a joint for different types of screw water meters embodying the present invention will be described with reference to the drawings. FIG. 2 is a schematic diagram of a connection structure between the water meter after replacement and the primary side and secondary side pipes including the joint according to the embodiment of the present invention. In the figure, members similar to those of the conventional example shown in FIG. Although not shown in the figure, the connecting screw portion 3 provided at the primary and secondary ends of the water meter has a different specification from the screw portion of the water meter before replacement.

  As shown in the figure, the connection structure on the primary side is the same as that of the conventional example shown in FIG. 1 except that the joint 5 is replaced, except that the specification of the screw of the cap nut is different. The primary side end is connected to a primary side pipe (not shown) via a joint 5 and a water stop cock 19. On the other hand, the configuration of the secondary side is different from that of the conventional example, and the secondary side end of the water meter 1 is connected to the shimoku 25 via the joint 41. The cap nut 27 of the shimok 25 is retracted in a direction away from the water meter 1 and is not used to connect the water meter 1 and the shimok 25.

  Next, the joint 41 will be described with reference to FIGS. 3 is a front longitudinal sectional view of the joint 41, FIG. 4 is a plan view of the joint 41, and FIGS. 5 and 6 are left and right drawings of the joint 41.

  The joint 41 includes a nut portion 43 occupying the left half from the center in FIG. 3, an intermediate portion 47 and a U-shaped portion 49 located on the right side. The nut portion 43 has the same shape as the hexagonal nut, and a female screw portion 45 made of the same type of screw as the newly installed water meter 1 is formed on the inner peripheral surface thereof, and the diameter thereof is the tap water. It corresponds to the threaded portion 3 provided at the secondary side end of the meter 1. On the other hand, the intermediate portion 47 is formed along the circumferential direction half of the nut portion 43, that is, along the inner circumference of about 180 °, and the inner circumference side is concentric with the screw hole of the nut portion 43. The U-shaped portion 49 includes a concentric semicircular portion 51 formed at the same position in the circumferential direction as the intermediate portion 47 and a pair of arm portions 53 extending in parallel to the tangential direction at both ends of the semicircle. ing. A hole 55 is provided at a corresponding position at the tip of the arm portion 53, and one hole 55 is a screw hole. Bolts 59 to be described later are inserted into the holes 55.

  The inner diameter of the intermediate portion 47 is a dimension corresponding to the outer diameter of the flange portion 29 of the shimok 25. On the other hand, the inner diameter of the semicircular part 51 of the U-shaped part 49 is smaller than the outer diameter of the flange part 29 (that is, smaller than the inner diameter of the intermediate part 47) and larger than the outer diameter of the shimoku 25. Further, a stepped portion 57 is formed on the inner peripheral side of the intermediate portion 47 side of the U-shaped portion 49 so that the inner diameters of the semicircular portion 51 and the intermediate portion 47 are the same. The sum of the axial widths of the stepped portion 57 and the intermediate portion 47 is slightly larger than the axial width of the flange portion 29 of the shimoku 25. The intermediate part 47 and the U-shaped part 49 receive the shimoku 25 as will be described later.

  In the present embodiment, the stepped portion 57 is provided in the U-shaped portion 49, but the stepped portion 57 is formed by making the axial width of the intermediate portion 47 correspond to the axial width of the flange portion 29 of the shimok 25. May not be formed. Moreover, although the U-shaped part 49 is comprised so that the arm part 53 may be provided, it is not necessarily limited to this, For example, it can also provide in the intermediate part 47.

  Then, with reference to FIGS. 7-10, the attachment procedure to the shimok 25 of the coupling 41 is demonstrated. FIGS. 7 to 9 are drawings showing a procedure for attaching the joint 41 to the shimok 25, each showing a state before, during and after the attachment. FIG. 10 is a cross-sectional view of the shimoku 25 with the joint 41 attached. Although not shown, the shimok 25 and the secondary side pipe remain coupled. 7 to 9, the cap nut 27 originally attached to the shimoku 25 is not shown. Moreover, although the arm part 53 shown to FIGS. 7-10 differs in the shape from the same member as FIGS. 2-6, since it does not affect the summary of invention, description about this is abbreviate | omitted.

  First, after the cap nut 27 (not shown) of the shimok 25 is retracted away from the water meter 1, the shimok 25 is received on the inner peripheral surface side of the intermediate portion 47 of the joint 41 and the U-shaped portion 49. Move closer (see FIG. 7). At this time, the flange portion 29 of the shimok 25 is aligned so as to come to the position of the intermediate portion 47 and the stepped portion 57 of the U-shaped portion 49. When the shimoku 25 is received by the arm part 53 and received in the intermediate part 47 and the U-shaped part 49, the shimoku 25 comes into contact with the semicircular part 51 of the U-shaped part 49, so that the joint 41 and the shimoku 25 Are located at the attachment positions (see FIG. 8). At this time, the joint 41 and the shimoku 25 are located on the same axis.

  After the shimok 25 is received by the intermediate portion 47 and the U-shaped portion 49 of the joint 41, as shown in FIG. 9, the bolt is removed from one hole 55 provided on the distal end side of the arm portion 53 of the U-shaped portion 49. 59 is inserted and engaged with the other screw hole and tightened. The bolt 59 includes a columnar shaft portion 61 and an ear-shaped gripping portion 63 provided at one end of the shaft portion 61. Referring to FIG. 10, there is almost no gap between the outer peripheral surface of the shaft portion 61 of the inserted bolt 59 and the outer peripheral surface of the shimoku 25. By inserting the bolt 59, the movement of the shimoku 25 in the radial direction is reduced. This restricts the shimoku 25 from being removed from the intermediate portion 47 and the U-shaped portion 49 of the joint 41. In the present embodiment, there is almost no gap between the outer periphery of the shaft portion 61 of the bolt 59 and the side surface of the shimoku 25. However, the shimoku 25 is formed in the middle portion 47 of the joint 41 and the U-shape. The positions of the bolts 59 and the holes 55 can be changed within a range that does not come out of the portion 49.

  As described above, the inner diameter of the semicircular portion 51 of the U-shaped portion 49 is smaller than the outer diameter of the flange portion 29 of the shimoku 25 and larger than the outer diameter of the shimoku 25. Therefore, as shown in FIG. 10, the semicircular portion 51 comes into contact with the flange portion 29 and the joint 41 is locked, and the joint 41 is restricted from moving to the primary side in the axial direction. It is prevented from coming off. Further, the female screw portion 45 of the nut portion 43 corresponds to the screw portion 3 at the secondary side end portion of the water meter 1, and the inner diameter of the female screw portion 45 is slightly smaller than the outer diameter of the flange portion 29 of the shimok 25. Since it is large, the joint 41 can be freely moved to the secondary side in the axial direction. Therefore, the joint 41 can be handled like the cap nut 27 attached to the shimok 25. And the water meter 1 and the shimok 25 can be connected by attaching the nut part 43 of the coupling 41 to the screw part 3 of the secondary side end part of the water meter 1.

  With reference to FIG. 11, the replacement | exchange method of the water meter 1 is demonstrated. FIG. 11 is a view showing a state after replacement in which the water meter 1 and the shimok 25 are connected via the joint 41, and only the joint 41 is shown in cross section.

  First, after closing the stop cock 19, loosen the cap nut 15 of the joint 5 and the cap nut 27 of the shimok 25 from the threaded portions 3 of the primary and secondary ends of the water meter to be replaced. Remove and retract in the direction away from the water meter 1. After removing the installed water meter 1, the existing joint 5 is replaced with a new joint 5 having a cap nut 15 formed with the same type of screw as the screw 3 of the new water meter 1, and the same type of screw. The joint 41 including the nut portion 43 formed with is attached to the shimoku 25 in the manner described above. Next, in a state where the joint nut 41 attached to the joint 5 and the joint 41 attached to the shimok 25 are retracted away from the water meter 1, the new water meter 1 is disposed at a predetermined position, and the joint nut 15 of the joint 5 and Each joint 41 (nut part 43) is advanced toward the water meter 1. At this time, the packings 17 and 33 are arranged in the cap nut 15 and the nut portion 43 of the joint 41. Finally, the cap nut 15 and the joint 41 (nut portion 43) of the joint 5 are respectively rotated with respect to the water meter 1 and screwed into the primary and secondary screw portions 3 of the water meter 1, The water meter 1, the joint 5, and the shimok 25 are connected, and the water meter 1 and the primary side and secondary side pipes communicate with each other.

  According to this embodiment, since the shimoku 25 can be connected to the water meter 1 of a different type screw without exchanging, the replacement of the water meter 1 of a different type screw is facilitated. Even if the pipe is a PVC pipe or a flexible pipe, it can be replaced with a water meter 1 of a different screw without excavation work, so the replacement work can be performed quickly and inexpensively. It is possible to deal with various types of screws only by changing the type of screw of the nut portion 43 of the joint 41 (and the cap nut 15 of the joint 5).

  Next, a second embodiment will be described. The second embodiment differs from the first embodiment in the configuration of the intermediate portion and the U-shaped portion of the joint, but the configuration of the other portions is the same. Therefore, only the configuration of the intermediate part and the U-shaped part of the joint will be described below. This embodiment is not shown in the drawings.

  The arm portion as in the first embodiment is not provided in the U-shaped portion of the joint of the second embodiment. The semi-circular portion of the intermediate portion and the U-shaped portion is provided with a male screw portion including a screw corresponding to the cap nut originally attached to the shimoku on the outer peripheral surface. When attaching the joint to the shimok, the shimok is received by the intermediate part and the semicircle part as in the first embodiment, and then the shimoku cap nut that has been retracted is advanced to the intermediate part and semicircle part of the joint. And screwed into the external thread provided on the outer peripheral surface. As a result, the shimoku is prevented from coming off in the radial direction, and the shimoku is prevented from coming off from the middle part and the semicircular part of the joint. Note that the male thread portion is not necessarily provided on the entire outer peripheral surface of the intermediate portion and the semicircular portion, and may be provided over a certain range in the axial direction of the outer peripheral surface.

  In the present embodiment, since the cap nut originally attached to the shimoku is attached to the male thread of the joint, the shimoku can be prevented from coming out radially outward from the joint. Compared to the form, the number of parts can be reduced. Moreover, since the shimoku can be prevented from being removed simply by rotating the cap nut originally attached to the shimoku, the retaining work can be performed in a smaller space than when the bolt is used.

DESCRIPTION OF SYMBOLS 1 Water meter 3 Thread part 5 Joint 7 Joint nut 11 Joint pipe 15 Cap nut 19 Stop cock 25 Shimoku 27 Cap nut 29 Flange part 41 Joint 43 Nut part 45 Female thread part 47 Middle part 49 U-shaped part 53 Arm part 55 Hole 57 Stepped part 59 Bolt

Claims (6)

In a joint used for replacement mounting of different types of threaded water meters with different screw specifications, a joint body including a nut portion and a mounting portion formed integrally with the nut portion on one axial side of the nut portion is provided. The mounting portion passes through the screw hole of the nut portion, and is attached to the installed water pipe. At least on the water meter side of Shimok, which is attached to the water meter before replacement, is attached. A void portion that can receive the upstream portion that is positioned, the void portion being an opening through which the shimoku opened on one side in a direction substantially orthogonal to the axial direction of the nut portion can pass; A locking portion that engages with an outer flange formed at the upstream end portion and restricts movement of the shimoku in a direction away from the nut portion, and the joint further has a diameter of the shimoku. Wherein the moving the direction outwardly and a retaining means to prevent the escape from the cavity portion, the joint. 2. The joint according to claim 1, wherein the void portion has a receiving portion having a substantially semicircular inner periphery in a cross section in a plane substantially orthogonal to the axial direction of the nut portion, and the nut portion from the receiving portion. And a pair of arm portions extending in parallel in a direction substantially perpendicular to the axial direction of the arm portion, and the shimoku is movable to the receiving portion through between the end portions of the arm portion. 3. The joint according to claim 2, wherein the retaining means includes a hole formed in each of the pair of arm portions, and a shaft member inserted through the hole and fixed to the arm portion. And fittings. 4. The joint according to claim 3, wherein the arm portion has a predetermined length in a direction substantially orthogonal to the axial direction of the nut portion from the tip of the arm portion over a predetermined length range of a portion adjacent to the nut portion. The joint is characterized in that the flange of the shimok is received by a receiving portion corresponding to the notched portion. The joint according to claim 1, wherein a male screw is formed on an outer periphery of the attachment portion, and the male screw is screwed into a nut attached to the shimoku to constitute the retaining means. Fittings. The joint according to any one of claims 1 to 5, wherein the space portion is formed with a large-diameter portion that receives the flange of the shimok, followed by a remaining portion of the upstream portion of the shimok. And a small diameter portion for receiving the joint, wherein the locking portion is constituted by a shoulder portion formed between the large diameter portion and the small diameter portion.

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