Corrosion-resistant core installation tool

Abstract

The objective is to provide a corrosion-resistant core installation tool that allows for easy and reliable installation of corrosion-resistant cores into water passage holes in main water pipes. [Solution] The insertion rod 42 of the corrosion-resistant core installation tool 4 has an annular recess 420 extending in the circumferential direction at its tip 42a and a ring portion 43 inserted through the recess 420 along the axial direction of the insertion rod 42. The recess 420 is formed as a tapered surface 423 in which the outer diameter gradually decreases from the circumferential surface on the base end side to the circumferential surface on the tip end side of the insertion rod 42. When the tip 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 43 slides along the tapered surface 423 toward the base end side, creating a clamping state between the insertion rod 42 and the corrosion-resistant core 3. Conversely, when the tip 42a of the insertion rod 42 is pulled out of the corrosion-resistant core 3, the ring portion 43 slides along the tapered surface 423 toward the tip end side, releasing the clamping state between the insertion rod 42 and the corrosion-resistant core 3.

Description

【Technical Field】 【0001】 The present invention relates to an anticorrosion core mounting tool provided with an insertion rod for mounting an anticorrosion core in a water passage hole drilled in a main water pipe to which a water distribution plug for distributing water flowing through the main water pipe to a branch water pipe is attached. 【Background Art】 【0002】 Generally, when distributing water flowing through a main water pipe buried underground to buildings such as houses and condominiums through branch water pipes, a water distribution plug unit is used. This water distribution plug unit includes a water distribution plug having an inflow pipe connected to a water passage hole formed in the main water pipe, a mounting member for attaching the water distribution plug to the main water pipe, and an anticorrosion core inserted into the water passage hole of the main water pipe (see Patent Document 1). 【0003】 When attaching the anticorrosion core to the water passage hole, as shown in Patent Document 2, first, the ball valve body (ball valve 5) of the water distribution plug is closed (the inlet and outlet of the ball valve body (ball valve 5) face the side of the water distribution plug), and then an anticorrosion core mounting tool (exchanger 7) is attached to the insertion pipe (equipment insertion hole 11) of the water distribution plug. This anticorrosion core mounting tool (exchanger 7) includes a fixture (adapter 73) fixed to the upper end of the inflow pipe of the water distribution plug, an insertion rod (shaft 71 and close contact core insertion rod b) provided in a manner of penetrating the fixture (adapter 73) and having an anticorrosion core (close contact core d) mounted at the lower end, and a handle portion (bar handle 85) provided at the upper end of the insertion rod (shaft 71 and close contact core insertion rod b). The insertion rod (shaft 71 and close contact core insertion rod b) is made to move forward or backward in the vertical direction by the pushing or pulling operation of the handle portion (bar handle 85) of the operator. 【0004】 Then, with the ball valve body (spherical valve 5) of the water distribution valve in the open position (with the inlet and outlet of the ball valve body facing vertically), the insertion rod (shaft 71 and sealing core insertion rod b) is advanced downward inside the water distribution valve by pushing the handle (bar handle 85). As a result, the corrosion-resistant core (sealing core d) at the tip of the insertion rod also passes through the ball valve body (spherical valve 5) and moves downward through the inlet pipe of the water distribution valve, and is inserted in a sealed state as if being pushed into the water passage hole B of the main water pipe. 【0005】 Then, by pulling out the handle (bar handle 85), the insertion rod (shaft 71 and tight core insertion rod b) is retracted upward inside the water distribution valve 1, returning the tip of the insertion rod (shaft 71 and tight core insertion rod b) to its original position on the fixing device (adapter 73). Next, the ball valve body (spherical valve 5) of the water distribution valve is closed again (with the inlet and outlet of the ball valve body (spherical valve 5) facing the side of the water distribution valve), the corrosion protection core installation tool (replacement device 7) is removed from the insertion pipe (equipment insertion hole 11) of the water distribution valve, and the upper end of the insertion pipe (equipment insertion hole 11) is closed with a cap member to complete the installation of the corrosion protection core. [Prior art documents] [Patent Documents] 【0006】 [Patent Document 1] Japanese Patent Publication No. 2006-046564 [Patent Document 2] Japanese Patent Publication No. 2003-269681 [Overview of the project] [Problems that the invention aims to solve] 【0007】 However, with conventional corrosion-resistant core installation tools, the outer surface of the tip of the insertion rod and the inner surface of the corrosion-resistant core simply come into close contact. Therefore, when installing a corrosion-resistant core into a water main pipe's water passage hole, a large frictional force is constantly generated between the tip of the insertion rod and the corrosion-resistant core from the moment of insertion, making it difficult to insert the tip of the insertion rod into the corrosion-resistant core. Similarly, when withdrawing the tip of the insertion rod from the corrosion-resistant core after it has been installed in the water main pipe's water passage hole, a large frictional force is constantly generated between the tip of the insertion rod and the corrosion-resistant core from the moment of withdrawal, making it difficult to withdraw the tip of the insertion rod from the corrosion-resistant core. As a result, the installation work of water main pipe branch valves becomes time-consuming and laborious, leading to a decrease in work efficiency. 【0008】 Furthermore, forcibly inserting the insertion rod into the corrosion-resistant core, or forcibly pulling the insertion rod out of the corrosion-resistant core, can cause problems such as damage to the corrosion-resistant core, and the watertightness may decrease due to the corrosion-resistant core becoming tilted, potentially affecting the quality of the water tap. 【0009】 This invention has been made in view of the above-mentioned problems, and aims to provide a corrosion-resistant core installation tool that can easily and reliably install a corrosion-resistant core into the water passage hole of a water main, thereby improving the quality of the water tap. [Means for solving the problem] 【0010】 To achieve the above objective, the present invention provides a corrosion-resistant core installation tool comprising an insertion rod for installing a corrosion-resistant core in a water passage hole drilled in a water main pipe to which a water distribution valve is installed for distributing water flowing from a water main pipe to a water branch pipe, wherein the insertion rod has an annular recess formed in a manner that extends circumferentially at its tip and a ring portion inserted through the recess in a manner that allows it to slide along the axial direction of the insertion rod, wherein when the tip of the insertion rod is inserted into the corrosion-resistant core, the ring portion slides toward the base end of the recess, thereby creating a clamping state between the insertion rod and the corrosion-resistant core, and when the tip of the insertion rod is withdrawn from the corrosion-resistant core, the ring portion slides toward the tip of the recess, thereby releasing the clamping state between the insertion rod and the corrosion-resistant core. 【0011】 According to this, when the tip of the insertion rod is inserted into the corrosion-resistant core, the ring portion slides toward the base end of the recess, creating a clamping state between the insertion rod and the corrosion-resistant core, allowing the tip of the insertion rod to be inserted into the corrosion-resistant core easily and reliably. Furthermore, when the tip of the insertion rod is withdrawn from the corrosion-resistant core, the ring portion slides toward the tip of the recess, releasing the clamping state between the insertion rod and the corrosion-resistant core, allowing the tip of the insertion rod to be withdrawn from the corrosion-resistant core easily and reliably. 【0012】 Furthermore, the recess may have a larger diameter portion on the circumferential surface of the base end of the insertion rod, having an outer diameter larger than the inner diameter of the ring portion, and a smaller diameter portion on the circumferential surface of the tip end of the insertion rod, having an outer diameter smaller than the inner diameter of the ring portion. In this case, when the tip end of the insertion rod is inserted into the corrosion-resistant core, the ring portion slides on the larger diameter portion on the circumferential surface of the base end of the recess, ensuring a secure grip between the larger diameter portion of the insertion rod and the corrosion-resistant core. Also, when the tip end of the insertion rod is withdrawn from the corrosion-resistant core, the ring portion slides on the smaller diameter portion on the tip end of the recess, ensuring a secure grip between the smaller diameter portion of the insertion rod and the corrosion-resistant core. 【0013】 Furthermore, the recess may be formed as a tapered surface, with the outer diameter gradually decreasing from a larger diameter portion formed on the circumferential surface of the base end of the insertion rod to a smaller diameter portion formed on the circumferential surface of the tip end of the insertion rod. In this case, when the tip end of the insertion rod is inserted into the corrosion-resistant core, the ring portion slides smoothly on the larger diameter portion of the circumferential surface of the base end of the recess, ensuring a secure grip between the larger diameter portion of the insertion rod and the corrosion-resistant core. Also, when the tip end of the insertion rod is withdrawn from the corrosion-resistant core, the ring portion slides smoothly on the smaller diameter portion of the recess on the tip end side, ensuring a secure grip between the smaller diameter portion of the insertion rod and the corrosion-resistant core. 【0014】 Furthermore, the recess may have a tapered surface that is inclined at an angle between 5 and 45 degrees relative to the axial direction of the insertion rod. In this case, since the angle of inclination of the tapered surface relative to the axial direction of the insertion rod is 5 degrees or more, the ring portion is securely clamped between the larger diameter portion of the insertion rod and the corrosion-resistant core. Also, since the angle of inclination of the tapered surface relative to the axial direction of the insertion rod is 45 degrees or less, the ring portion can slide smoothly on the tapered surface of the recess. 【0015】 Furthermore, the recess may have a first stepped portion projecting radially outward at the base end of the larger diameter portion, and a second stepped portion projecting radially outward at the tip end of the smaller diameter portion. In this configuration, when the ring portion slides within the recess, the first stepped portion functions as a stopper at the base end, and the second stepped portion functions as a stopper at the tip end, thereby reliably restricting the range of motion of the ring portion. 【0016】 Furthermore, the ring portion may be made of a resin material or an elastic material. In this case, since the ring portion expands and contracts radially, when the tip of the insertion rod is inserted into the corrosion-resistant core, the ring portion is securely clamped between the larger diameter portion of the recess and the corrosion-resistant core, and when the tip of the insertion rod is withdrawn from the corrosion-resistant core, the clamped state of the ring portion between the smaller diameter portion of the recess and the corrosion-resistant core is reliably released. Moreover, the resin material or elastic material of the ring portion can prevent or reduce the risk of damaging the inner surface of the corrosion-resistant core. 【0017】 Furthermore, the ring portion may be formed so that its inner circumferential surface conforms to the circumferential surface of the recess. This allows the ring portion to slide smoothly within the recess. Also, when the ring portion is clamped between the larger diameter portion of the insertion rod and the corrosion-resistant core, the contact area between the inner circumferential surface of the ring portion and the circumferential surface of the larger diameter portion of the recess increases, thus ensuring that the corrosion-resistant core is securely held at the tip of the insertion rod. In addition, when the corrosion-resistant core is pressed into the water passage hole of the main water pipe, the pressing force of the insertion rod can be reliably transmitted to the corrosion-resistant core. 【0018】 Furthermore, the end of the ring portion on the tip side may abut against a stepped portion on the corrosion-resistant core side formed on the inside of the corrosion-resistant core. This ensures that when the corrosion-resistant core is pressed into the water passage hole of the main water pipe, the pressing force of the insertion rod can be reliably transmitted to the corrosion-resistant core via the ring portion. [Effects of the Invention] 【0019】 According to the present invention, when the tip of the insertion rod is inserted into the corrosion-resistant core, the ring portion slides toward the base end of the recess, creating a clamping state between the insertion rod and the corrosion-resistant core, allowing the tip of the insertion rod to be inserted into the corrosion-resistant core easily and reliably. Furthermore, when the tip of the insertion rod is withdrawn from the corrosion-resistant core, the ring portion slides toward the tip of the recess, releasing the clamping state between the insertion rod and the corrosion-resistant core, allowing the tip of the insertion rod to be withdrawn from the corrosion-resistant core easily and reliably. 【0020】 Thus, the tip of the insertion rod can be easily and reliably inserted into the corrosion-resistant core, the corrosion-resistant core can be easily and reliably pressed into and fixed in the water passage hole of the water main, and the tip of the insertion rod can be easily and reliably withdrawn from the corrosion-resistant core, making it possible to easily and reliably attach the corrosion-resistant core to the water passage hole of the water main. 【0021】 Therefore, the installation of branch valves on the main water pipes will require less time and effort, increasing work efficiency, and the quality of the branch valves will be improved by preventing damage to the corrosion-resistant core. [Brief explanation of the drawing] 【0022】 [Figure 1] This is a cross-sectional view showing the overall configuration of the water distribution tap unit according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the fixing structure of the anticorrosion core in the water distribution tap unit of FIG. 1. [Figure 3] This is a perspective view showing the anticorrosion core of FIG. 2. [Figure 4] This is a side view showing the anticorrosion core mounting tool. [Figure 5] These are (a) a side view and (b) a cross-sectional view of the tip of the insertion rod of FIG. 4. [Figure 6] This is a view showing the operation of the ring portion when inserting or pulling out the anticorrosion core from the insertion rod. [Figure 7] This is a view showing the overall procedure when attaching the anticorrosion core to the water passage hole of the main water pipe. [Figure 8] This is a view showing the operation of the ring portion when press-fitting the anticorrosion core into the water passage hole of the main water pipe. 【Embodiments for Carrying Out the Invention】 【0023】 Next, the water distribution tap unit according to the present invention will be described with reference to FIGS. 1 to 8. 【0024】 As shown in FIG. 1, this water distribution tap unit includes a water distribution tap 1 for distributing the water flowing in the main water pipe P1 to the branch water pipes P2, a mounting member 2 for attaching the water distribution tap 1 to the main water pipe P1, and an anticorrosion core 3 inserted into the water passage hole h drilled in the main water pipe P1. The anticorrosion core 3 is inserted into the water passage hole h by an anticorrosion core mounting tool 4. 【0025】 As shown in FIG. 1, the water distribution tap 1 includes a water distribution tap body 10 attached between the main water pipe P1 and the branch water pipes P2, a ball valve body 11 housed inside the water distribution tap body 10, and a tap rod 12 for axially rotating the ball valve body 11 around a predetermined rotation axis. In this embodiment, the rotation axis K extends horizontally along the central axis of the tap rod 12. 【0026】 The water distribution valve body 10 has an overall shape that is roughly cross-shaped and includes an inlet pipe 101 provided at the lower part in the vertical direction, an outlet pipe 102 provided at the front in the horizontal direction, an insertion pipe 103 provided at the upper part in the vertical direction, and an operating pipe 104 provided at the rear in the horizontal direction. 【0027】 The inlet pipe 101 is formed in a cylindrical shape that extends downward perpendicular to the rotation axis K, and its tip opening is connected to the main water pipe P1, allowing water flowing through the main water pipe P1 to flow into it. 【0028】 Furthermore, the inlet pipe 101 has multiple (four in this embodiment) annular grooves 106 formed along the axial direction on the inner circumferential surface of the tip end on the water supply body side. These grooves 106 are for the flange portion 323 of the corrosion-resistant core 3 to fit and engage when the corrosion-resistant core 3 is inserted into the water passage hole h of the water supply main pipe P1, as will be described later. 【0029】 The outflow pipe 102 is formed in a cylindrical shape that extends forward along the rotation axis K, and its tip opening is connected to the water branch pipe P2, so that water that has flowed from the inflow pipe 101 via the ball valve body 11 flows out into the water branch pipe P2. 【0030】 The insertion tube 103 is formed in a cylindrical shape that extends upward perpendicular to the rotation axis K. Normally, the tip opening is closed by the cap member 105, while when installing the water distribution valve 11, the cap member 105 is removed and the cutting tool or corrosion-resistant core installation tool 4 is inserted. 【0031】 The operating pipe 104 is formed in a cylindrical shape that extends rearward along the rotation axis K, and a stopper rod 12 is inserted through it. The stopper rod 12 comprises a shaft portion 121 inserted inside the operating pipe 104, an operating portion 122 exposed from the tip opening of the operating pipe 104, and a nut portion 123 provided to cover the tip opening of the operating pipe 104, with the tip of the shaft portion 121 connected to the rear center of the ball valve body 11. As a result, when the stopper rod 12 is rotated axially while gripping the operating portion 122 with a predetermined tool, the ball valve body 11 rotates axially around the rotation axis K inside the water distribution valve body 10. 【0032】 The ball valve body 11 is a metal sphere that is rotatably supported inside the water tap body 10, sandwiched from above and below by upper and lower annular ball seats 114. 【0033】 Furthermore, as shown in Figure 1, the ball valve body 11 includes an inlet 111 formed at the lower part in the vertical direction, an outlet 112 formed at the front part in the horizontal direction, and an insertion opening 113 formed at the upper part in the vertical direction, with the inside of the ball valve body 11 being perforated in such a way that the inlet 111, outlet 112, and insertion opening 113 are connected. 【0034】 The inlet 111 is positioned such that when the ball valve body 11 is housed in the water distribution valve body 10, the ball valve body 11 is rotated by the stopper rod 12 at a predetermined angle (90 degrees in this embodiment), causing it to open toward the inlet pipe 101 when open, and to open toward the side of the water distribution valve body 10 when closed. 【0035】 The outlet 112 is positioned to open toward the outflow pipe 102 when the ball valve body 11 is housed in the water tap body 10, by causing the ball valve body 11 to rotate axially by the stopper rod 12 at a predetermined angle (90 degrees in this embodiment). 【0036】 The insertion port 113 is positioned to open toward the insertion pipe 103 when the valve is open, while it is positioned to open toward the side of the valve body 10 when the valve is closed. 【0037】 When opening the water supply valve 11, the ball valve body 11 is rotated axially by the valve rod 12, so that the outlet 112 of the ball valve body 11 is open toward the outflow pipe 102, and the inlet 111 and insertion port 113 of the ball valve body 11 are open toward the inflow pipe 101 and insertion pipe 103, respectively. This results in the insertion pipe 103 and the inflow pipe 101 being in a straight line through the inside of the ball valve body 11, and the inflow pipe 101 and the outflow pipe 102 being in a bent line through the ball valve body 11. 【0038】 On the other hand, when closing the water supply valve 1, by rotating the ball valve body 11 axially with the stopper rod 12, the outlet 112 of the ball valve body 11 is positioned to open toward the outflow pipe 102, while the inlet 111 and insertion port 113 of the ball valve body 11 are positioned to open toward the side of the ball valve body 11, thereby closing the inflow pipe 101 and outflow pipe 102 of the water supply valve 1 with the ball valve body 11. 【0039】 The mounting member 2 comprises a saddle 21 to which the branch valve 1 is connected and which is fixed to the upper outer surface of the main water pipe P1; a band 22 positioned opposite the saddle 21 across the main water pipe P1 and fixed to the lower outer surface of the main water pipe P1; a gasket 23 provided between the saddle 21 and the main water pipe P1; and a fastening device 24 consisting of a bolt 24a and a nut 24b that connects and fixes the saddle 21 and the band 22 to the water supply body. 【0040】 As a result, when a worker brings the saddle 21 to which the branch valve 1 is attached into contact with the upper outer surface of the main water pipe P1, and the band 22 into contact with the lower outer surface of the main water pipe P1, and then tightens them with the fastening device 24 consisting of bolts 24a and nuts 24b on both sides of the saddle 21 and band 22, the branch valve 1 can be attached to the main water pipe P1. Note that the degree of contraction of the gasket 23 changes in accordance with the tightening or detangling of the bolts 24a of the mounting member 2, so the position of the inlet pipe 101 of the branch valve 1 relative to the main water pipe P1 changes slightly in the axial direction. 【0041】 As shown in Figures 2 and 3, the corrosion-preventive core 3 is a cylindrical member provided for corrosion prevention of the water passage hole h of the water main pipe P1, and comprises an outer core portion 31 that fits tightly into the water passage hole h, and an inner core portion 32 that fits tightly inside the outer core portion 31. 【0042】 The outer core portion 31 is a cylindrical member made of metal or resin, comprising an upper cylindrical portion 311 with a larger outer diameter and inner diameter, and a lower cylindrical portion 312 with a smaller outer diameter and inner diameter, wherein the upper cylindrical portion 311 and the lower cylindrical portion 312 are integrally formed along the axial direction. 【0043】 Furthermore, the outer core portion 31 is provided with rubber members 313 on the outer circumferential surfaces of the upper cylindrical portion 311 and the lower cylindrical portion 312. These rubber members 313 are formed in a shape corresponding to the upper cylindrical portion 311 and the lower cylindrical portion 312 of the outer core portion 31, and a stepped portion 313a is formed at the boundary between the upper cylindrical portion 311 and the lower cylindrical portion 312. As a result, when the corrosion-resistant core 3 is inserted into the water passage hole h of the water main pipe P1, the rubber members 313 expand upon contact with water, causing the stepped portion 313a of the rubber members 313 to abut against the periphery of the water passage hole h of the water main pipe P1, and the rubber members 313 are fitted into the water passage hole h in a manner in which they are pressed radially inward from the periphery of the water passage hole h of the water main pipe P1. 【0044】 The inner core portion 32 is a cylindrical member made of metal or resin, comprising an upper cylindrical portion 321 with a larger outer diameter and a lower cylindrical portion 322 with a smaller outer diameter, wherein the upper cylindrical portion 321 and the lower cylindrical portion 322 are integrally formed along the axial direction, and the upper cylindrical portion 321 and the lower cylindrical portion 322 are formed on a continuous inner circumferential surface along the axial direction. 【0045】 Furthermore, the inner core portion 32 is provided with a stepped portion 325 at the boundary between the upper cylindrical portion 321 and the lower cylindrical portion 322. As will be described later, when the tip portion 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, this stepped portion 325 contacts the ring portion 421 of the insertion rod 42, thereby ultimately restricting the insertion of the insertion rod 42. 【0046】 Furthermore, the inner core portion 32 has an annular flange portion 323 extending radially outward along the circumferential direction on the outer circumferential surface of the upper end of the upper cylindrical portion 321. This flange portion 323 protrudes radially outward from the outer core portion 31 (including the rubber member 313) to correspond to the width, depth, and diameter of the groove portion 106 of the inlet pipe 101 of the water distribution valve 1, and engages with one of the groove portions 106 of the inlet pipe 101 of the water distribution valve 1 when the corrosion-resistant core 3 is inserted into the water passage hole h of the water main pipe P1. 【0047】 Furthermore, the inner core portion 32 has multiple axially extending notches 323a formed along the circumferential direction in the flange portion 323 of the upper cylindrical portion 321. Therefore, when the corrosion-resistant core 3 is passed through the inlet pipe 101 of the water distribution valve 1, the flange portion 323 is easily pressed inward radially by the inner circumferential surface of the inlet pipe 101, allowing the corrosion-resistant core 3 to move smoothly to the water passage hole h of the water main pipe P1. In addition, when the corrosion-resistant core 3 is inserted into the water passage hole h of the water main pipe P1, the flange portion 323 of the corrosion-resistant core 3 is easily engaged with the groove portion 106 of the inlet pipe 101 as it returns radially outward, allowing the corrosion-resistant core 3 to be securely fixed in the water passage hole h of the water main pipe P1. 【0048】 Furthermore, the inner core portion 32 has multiple notches 324a extending axially along the circumferential direction at the lower end of the lower cylindrical portion 322. Therefore, when the corrosion-resistant core 3 is inserted into the water passage hole h of the water main pipe P1, the projection 324 is pressed against the inner surface of the water passage hole h of the water main pipe P1 and bends radially inward. After passing through the water passage hole h of the water main pipe P1, it easily returns to its radially outward position. This allows the corrosion-resistant core 3 to be smoothly pressed into the water passage hole h of the water main pipe P1 and securely fixed. 【0049】 As shown in Figure 4, the corrosion-resistant core installation tool 4 comprises a fixing device 41 fixed to the upper end of the insertion pipe 103 of the water distribution valve 1, an insertion rod 42 provided in such a manner that it passes through the fixing device 41 and on which the corrosion-resistant core 3 is attached at its tip 42a, and a handle portion 43 provided at the base end 42b of the insertion rod 42, and the insertion rod 42 moves forward or backward in the vertical direction by pushing or pulling the handle portion 43 by the operator. 【0050】 The fixing portion 41 is formed in a cylindrical shape and is provided with a holding mechanism 411 for holding the insertion rod 42. The fixing portion 41 also has a stepped portion 41d formed by the lower end portion 41a being larger in diameter than the intermediate portion 41b. The fixing portion 41 is fixed in such a manner that the stepped portion 41d is placed over the upper end portion of the insertion pipe 103 of the water distribution valve 1. The fixing portion 41 also has a cap 412 attached to its upper end portion 41c through which the insertion rod 42 passes. 【0051】 As shown in Figure 5, the insertion rod 42 has an annular recess 420 formed at its tip 42a in a manner that extends in the circumferential direction, and a ring portion 421 inserted through the recess 420 in a manner that allows it to slide along the axial direction of the insertion rod 42. The 422 is an O-ring that makes close contact with the inner surface of the corrosion-resistant core 3 when the tip 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3. 【0052】 As shown in Figures 6(a) to 6(b), when the tip 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 421 slides from the tip to the base of the recess 420, creating a clamping state between the insertion rod 42 and the corrosion-resistant core 3. On the other hand, as shown in Figures 6(b) to 6(a), when the tip 42a of the insertion rod 42 is withdrawn from the corrosion-resistant core 3, the ring portion 421 slides toward the tip of the recess 420, releasing the clamping state between the insertion rod 42 and the corrosion-resistant core 3. The configuration and operation of the recess 420 and the ring portion 421 of the insertion rod 42 will be described in detail below. 【0053】 The recess 420 has a larger diameter portion 420a on the circumferential surface of the base end of the insertion rod 42, which has an outer diameter larger than the inner diameter of the ring portion 421, and a smaller diameter portion 420b on the circumferential surface of the tip end of the insertion rod 42, which has an outer diameter smaller than the inner diameter of the ring portion 421, and a flat tapered surface 420c is formed where the outer diameter gradually decreases from the larger diameter portion 420a to the smaller diameter portion 420b. As a result, when the tip portion 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 421 slides smoothly on the tapered surface 420c of the recess 420 toward the larger diameter portion 420a on the base end side of the recess 420, and securely clamps between the larger diameter portion 420a of the insertion rod 42 and the corrosion-resistant core 3. Furthermore, when the tip 42a of the insertion rod 42 is withdrawn from the corrosion-resistant core 3, the ring portion 421 slides smoothly along the tapered surface 420c toward the smaller diameter portion 420b on the tip side of the recess 420, thereby reliably releasing the pinched state between the smaller diameter portion of the insertion rod and the corrosion-resistant core. 【0054】 Furthermore, the recess 420 has a first stepped portion 420d that protrudes radially outward on the base end side of the larger diameter portion 420a, and a second stepped portion 420e that protrudes radially outward on the tip end 42a side of the smaller diameter portion 420b. As a result, when the ring portion 421 slides within the recess 420, the first stepped portion 420d functions as a stopper on the base end side, and the second stepped portion 420e functions as a stopper on the tip end 42a side, thereby reliably restricting the sliding range of the ring portion 421. 【0055】 The ring portion 421 is an annular O-shape or C-shape having a predetermined thickness overall, and is sized such that when fitted into the recess 420, its outer circumferential surface 421a protrudes radially from the recess 420 and it can slide axially within the recess 420. Specifically, the ring portion 421 has an outer diameter such that when the corrosion-resistant core 3 is inserted into the tip portion 42a of the insertion rod 42, the outer circumferential surface 421a contacts the inner circumferential surface of the corrosion-resistant core 3. Furthermore, the ring portion 421 has an inner diameter such that it contacts the large-diameter portion 420a when positioned in the large-diameter portion 420a, while being spaced apart from the small-diameter portion 420b when positioned in the small-diameter portion 420b. In addition, the ring portion 421 has a thickness such that it can slide between the large-diameter portion 420a and the small-diameter portion 420b on the tapered surface 420c of the recess 420. 【0056】 Furthermore, the ring portion 421 is made of a resin material or an elastic material. This allows the ring portion 421 to expand and contract radially, so that when the tip portion 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 421 is securely clamped between the larger diameter portion 420a of the recess 420 and the corrosion-resistant core 3, and when the tip portion 42a of the insertion rod 42 is withdrawn from the corrosion-resistant core 3, the ring portion 421 is securely released from the clamped state between the smaller diameter portion 420b of the insertion rod 42 and the corrosion-resistant core 3. Moreover, the resin material or elastic material of the ring portion 421 can prevent or reduce the risk of damaging the inner surface of the corrosion-resistant core 3. 【0057】 Furthermore, the ring portion 421 is formed with a shape in which the inner circumferential surface 421b has an inclined surface that decreases in diameter from the base end to the tip end, so as to follow the tapered surface 420c of the recess 420. This allows the ring portion 421 to slide smoothly along the tapered surface 420c of the recess 420. Also, when the ring portion 421 is clamped between the larger diameter portion 420a of the recess 420 and the corrosion-resistant core 3, the contact area between the inner circumferential surface 421b of the ring portion 421 and the circumferential surface of the larger diameter portion 420a of the recess 420 increases. For this reason, when the corrosion-resistant core 3 is inserted into the tip portion 42a of the insertion rod 42 as described later, the corrosion-resistant core 3 can be securely held in place by the tip portion 42a of the insertion rod 42. In addition, when the corrosion-resistant core 3 is pressed into the water passage hole h of the water main pipe P1, the pressing force of the insertion rod 42 can be reliably transmitted to the corrosion-resistant core 3. 【0058】 Furthermore, the end of the ring portion 421 is positioned so that it abuts against the stepped portion 325 on the corrosion-resistant core side, which is formed on the inside of the corrosion-resistant core 3. This ensures that when the corrosion-resistant core 3 is pressed into the water passage hole h of the main water pipe P1, the pressing force of the insertion rod 42 can be reliably transmitted to the corrosion-resistant core 3 via the ring portion 421. 【0059】 Next, we will explain how to install the corrosion-resistant core 3 into the water passage hole h of the main water pipe P1 using the corrosion-resistant core installation tool 4. 【0060】 First, the procedure for inserting the insertion rod 42 into the corrosion-resistant core 3 will be explained with reference to Figure 6. 【0061】 Initially, at the tip 42a of the insertion rod 42, the ring portion 421 is positioned in the smaller diameter portion 420b of the recess 420 due to its own weight. 【0062】 Next, as shown in Figure 6(a), when the tip 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 421 becomes locked to the inner surface of the corrosion-resistant core 3. As the insertion rod 42 moves forward, the ring portion 421 slides relative to the tapered surface 420c from the smaller diameter portion 420b to the larger diameter portion 420a of the recess 420, and is finally positioned in the larger diameter portion 420a of the recess 420, where it becomes clamped between the insertion rod 42 and the corrosion-resistant core 3. At this time, the ring portion 421 is gradually pressed against the tapered surface 420c, and consequently, the pressing force from the ring portion 421 to the corrosion-resistant core 3 gradually increases. 【0063】 Then, as shown in Figure 6(b), as the tip 42a of the insertion rod 42 is further inserted into the corrosion-resistant core 3, the ring portion 421 slides along the inner surface of the corrosion-resistant core 3 while being pressed against the larger diameter portion 420a and the first stepped portion 420d of the recess 420, and finally reaches the stepped portion 325 of the corrosion-resistant core 3, and the corrosion-resistant core 3 is completely held in place by the tip 42a of the insertion rod 42. 【0064】 In this way, the insertion rod 42 is inserted into the corrosion-resistant core 3 with a small force initially, and then the force is gradually increased, allowing the corrosion-resistant core to be easily and reliably inserted into the tip 42a of the insertion rod 42. 【0065】 Furthermore, when the tip 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the O-ring 422 is always in close contact with the inner circumferential surface of the corrosion-resistant core 3, so that the tip 42a of the insertion rod 42 can be stably and reliably inserted into the corrosion-resistant core 3 along the axial direction. 【0066】 Next, the procedure for inserting the insertion rod 42 holding the corrosion-resistant core 3 into the water passage hole h and then withdrawing it will be explained with reference to Figure 7. In Figure 7, the main water pipe P1 is in the state after the branch valve 1 has been attached via the mounting member 2 and after the water passage hole h has been drilled through the inlet pipe 101 of the branch valve 1. 【0067】 First, as shown in Figure 7(a), the ball valve body 11 of the water distribution valve 1 is closed (the inlet 111 and outlet 112 of the ball valve body 11 are facing sideways to the water distribution valve 1), and then the corrosion-resistant core mounting tool 4, which holds the corrosion-resistant core 3, is attached to the insertion pipe 103 of the water distribution valve 1. 【0068】 Next, as shown in Figure 7(b), the ball valve body 11 of the water distribution valve 1 is opened (the inlet 111 and outlet 112 of the ball valve body 11 are facing vertically), and the insertion rod 42 is advanced downward (towards the tip 42a) by pushing the handle part 43. As a result, the corrosion-resistant core 3 at the tip 42a of the insertion rod 42 also passes through the ball valve body 11 and moves downward (towards the tip 42a) through the inlet pipe 101 of the water distribution valve 1, and is pressed into the water passage hole h of the water main pipe P1 until the stepped portion 313a contacts the periphery of the water passage hole h of the water main pipe P1. 【0069】 Next, as shown in Figure 7(c), the insertion rod 42 is retracted upward (towards the base end 42b) inside the water tap 1 by pulling out the handle portion 43, and the tip portion 42a of the insertion rod 42 is returned to the original position of the fixing device 41. 【0070】 Next, the ball valve body 11 of the water distribution valve 1 is closed again (so that the inlet 111 and outlet 112 of the ball valve body 11 are facing sideways to the water distribution valve 1), the corrosion-resistant core tool 4 is removed from the insertion pipe 103 of the water distribution valve 1, and the upper end of the insertion pipe 103 is closed with the cap member 105 to complete the installation of the corrosion-resistant core 3. 【0071】 Next, the operation of the ring portion 421 when the corrosion-resistant core 3 is pressed into and then withdrawn from the water passage hole h will be explained with reference to Figure 8. 【0072】 First, as shown in Figure 8(a), when the insertion rod 42 holding the corrosion-resistant core 3 reaches the water passage hole h of the main water pipe P1, the ring portion maintains a clamped state between the recess and the corrosion-resistant core, so the corrosion-resistant core 3 remains held at the tip 42a of the insertion rod 42. 【0073】 Next, as shown in Figure 8(b), when the insertion rod 42 is pushed toward the water passage hole h of the water main pipe P1, the pressing force of the insertion rod 42 is transmitted to the corrosion-resistant core 3 via the ring portion 421, and the corrosion-resistant core 3 is pressed into the water passage hole h of the water main pipe P1. Finally, the stepped portion 313a of the corrosion-resistant core 3 comes into contact with the peripheral edge of the water passage hole h of the water main pipe P1, and the flange portion 323 of the inner core portion 32 engages with the groove portion 106 of the inlet pipe 101. This makes it possible to easily and reliably press-fit and fix the corrosion-resistant core 3 into the water passage hole h of the water main pipe P1. 【0074】 Next, as shown in Figure 8(c), when the tip 42a of the insertion rod 42 is withdrawn from the corrosion-resistant core 3 fixed to the water passage hole h of the water main pipe P1, the ring portion 421 is locked to the inner surface of the corrosion-resistant core 3 (which is press-fitted and fixed to the water passage hole h of the water main pipe P1). As the insertion rod 42 retracts, the ring portion 421 slides relative to the tapered surface 420c from the larger diameter portion 420a to the smaller diameter portion 420b of the recess 420. At this time, the ring portion 421 is gradually no longer pressed against the tapered surface 420c, and consequently, the pressing force against the corrosion-resistant core 3 gradually decreases. 【0075】 Finally, the ring portion 421 is completely released from its pinched state between the insertion rod 42 and the corrosion-resistant core 3 at the smaller diameter portion 420b of the recess 420, allowing the insertion rod 42 to be easily and reliably withdrawn from the corrosion-resistant core 3. 【0076】 In this embodiment, the recess 420 of the insertion rod 4 is formed as a tapered surface 420c in which the outer diameter gradually decreases from the larger diameter portion 420a to the smaller diameter portion 420b, but other shapes are also acceptable. Essentially, when the tip portion 42a of the insertion rod 42 is inserted into the corrosion-resistant core 3, the ring portion 421 slides toward the base end of the recess 420, creating a clamping state between the insertion rod 42 and the corrosion-resistant core 3. Conversely, when the tip portion 42a of the insertion rod 42 is withdrawn from the corrosion-resistant core 3, the ring portion 421 slides toward the tip of the recess 420, releasing the clamping state between the insertion rod 42 and the corrosion-resistant core 3. 【0077】 Furthermore, it is preferable that the recess 420 of the insertion rod 42 has a tapered surface that is inclined at an angle of inclination within the range of 5 to 45 degrees with respect to the axial direction of the insertion rod. With this arrangement, since the angle of inclination of the tapered surface 420c with respect to the axial direction of the insertion rod 42 is 5 degrees or more, the ring portion 421 is securely clamped between the larger diameter portion 420a of the recess 420 and the corrosion-resistant core 3. Also, since the angle of inclination of the tapered surface 420c with respect to the axial direction of the insertion rod 42 is 45 degrees or less, the ring portion 421 can slide smoothly on the tapered surface 420c of the recess 420. 【0078】 Furthermore, although the ring portion 421 is made of a resin material or an elastic material, it may be made of other materials. 【0079】 Furthermore, although the ring portion 421 is formed such that its inner circumferential surface 421b follows the tapered surface 420c of the recess 420, it may be formed in other shapes. 【0080】 In this example, the end of the ring portion 421 is designed to abut against the stepped portion 325 formed on the inside of the corrosion-resistant core 3, but it may be designed so that it does not abut. In this case, since the ring portion 421 only has the function of holding the corrosion-resistant core 3 on the tip portion 42a of the insertion rod 42, the portion of the insertion rod 42 other than the ring portion 421 may directly abut against the stepped portion 325 on the corrosion-resistant core side to transmit the pressing force of the insertion rod 42 to the corrosion-resistant core. 【0081】 Although embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention, or within an equivalent scope. [Explanation of Symbols] 【0082】 1... Water distribution valve 10... Water tap body 101...Inflow pipe 102...Outflow pipe 103... Insertion tube 104...Operation tube 105... Cap component 106… Groove 11...Ball valve body 111...Inlet 112... Outlet 113... Insertion opening 114... Ball sheet 12...stopper rod 121... Shaft 122...Operation unit 123... Nut part 2…Mounting parts 21... Saddle 22…band 23…Gasket 24... Fastening devices 24a... Bolt 24b... Nut 3…Corrosion-resistant core 31…Outer core section 311... Upper cylindrical part 312…Lower cylindrical part 313... Rubber components 313a...Stepped section 32...Inner core section 321... Upper cylindrical part 322…Lower cylindrical part 323... Tsuba (guard) 323a... Notch 324…Protrusion 324a... Notch 325...Double part 4…Corrosion-resistant core installation tool 41...Fixing tool 41a...lower end 41b…middle part 41c...Top end 41d...Double section 411...Holding mechanism 412... Cap 42... Insertion rod 42a...Tip 42b...Proximal end 420…recess 420a...Large diameter section 420b... Small diameter section 420c... Tapered surface 420d...First step 420e...Second section 421... Ring section 422... O-ring 43...Handle section P1...Main water pipe P2…Water branch pipe h…Water hole

Claims

[Claim 1] A corrosion-resistant core installation tool is provided, which includes an insertion rod for installing a corrosion-resistant core into a water passage hole drilled in the water main pipe to which the water distribution valve is to be installed when installing a water distribution valve to distribute water from the main water pipe to a branch water pipe, The insertion rod has an annular recess formed at its tip in a manner that extends circumferentially, and a ring portion inserted through the recess in a manner that allows it to slide along the axial direction of the insertion rod. When the tip of the insertion rod is inserted into the corrosion-preventive core, the ring portion slides toward the base end of the recess, thereby creating a clamping state between the insertion rod and the corrosion-preventive core, A corrosion-resistant core mounting tool characterized in that when the tip of the insertion rod is pulled out from the corrosion-resistant core, the ring portion slides toward the tip of the recess, thereby releasing the clamped state between the insertion rod and the corrosion-resistant core. [Claim 2] The corrosion-resistant core mounting tool according to claim 1, wherein the recess has a larger diameter portion formed on the circumferential surface of the base end of the insertion rod, having an outer diameter larger than the inner diameter of the ring portion, and a smaller diameter portion formed on the circumferential surface of the tip end of the insertion rod, having an outer diameter smaller than the inner diameter of the ring portion. [Claim 3] The corrosion-resistant core mounting tool according to claim 2, wherein the recess is formed on a tapered surface in which the outer diameter gradually decreases from a larger diameter portion formed on the circumferential surface of the base end of the insertion rod to a smaller diameter portion formed on the circumferential surface of the tip end of the insertion rod. [Claim 4] The corrosion-resistant core mounting tool according to claim 3, wherein the recess is inclined such that the tapered surface is inclined at an angle of inclination within the range of 5 to 45 degrees with respect to the axial direction of the insertion rod. [Claim 5] The corrosion-resistant core mounting tool according to any one of claims 1 to 4, wherein the recess has a first stepped portion that protrudes radially outward on the base end side of the large diameter portion, and a second stepped portion that protrudes radially outward on the tip side of the small diameter portion. [Claim 6] The corrosion-resistant core mounting tool according to any one of claims 1 to 4, wherein the ring portion is made of a resin material or an elastic material. [Claim 7] The corrosion-resistant core mounting tool according to any one of claims 1 to 4, wherein the ring portion is formed such that its inner circumferential surface conforms to the circumferential surface of the recess. [Claim 8] The corrosion-resistant core mounting tool according to any one of claims 1 to 4, wherein the end of the ring portion on the tip side abuts against a stepped portion on the corrosion-resistant core side formed on the inside of the corrosion-resistant core.

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