JP7510660B2 - Water distribution core inserter - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. (1) Published on October 7, 2019, on pages 690 to 691 of the Proceedings of the 2019 National Conference (Waterworks Research Presentation) published by the Japan Water Works Association. (2) Disclosed on November 7, 2019 at the 2019 National Conference (Waterworks Research Presentation) hosted by the Japan Water Works Association. (3) Disclosed on December 19, 2019, through product explanation and construction demonstration at the Waterworks Department of the Aomori City Enterprise Bureau.

This invention relates to an insertion device that can properly adjust the insertion depth when inserting a water distribution core into a water distribution hole in a water main through a water distribution valve, and to a new configuration that can be used commonly for multiple types of water distribution cores that have different insertion loads depending on the nominal diameter of the water distribution valve and the manufacturer.

When branching a water main pipe with a saddle water diverter, a water diversion core is inserted from the opening of the saddle water diverter to the water diversion hole drilled in the water main pipe. The water diversion core used for this has a two-layer structure with a resin sleeve as a sealing material on the outer layer and a metal sleeve as a core material on the inner layer (Patent Documents 1 to 4), and prevents leakage and corrosion at the insertion point (for this reason, water diversion cores are sometimes called "rust-proof sleeves" or "corrosion-proof sleeves").

The water distribution core is initially in a provisionally assembled state with a metal sleeve fitted one level above the plastic sleeve, and an inserter with a stretcher head attached to the tip is used to press the metal sleeve into the plastic sleeve, expanding the diameter of the plastic sleeve and crimping it to the water distribution hole, etc.

As disclosed in Patent Document 5, for example, the inserter for the water distribution core is equipped with a feed screw that converts the horizontal rotation of the handle into the up and down movement of a spindle (insertion rod), and a stretcher head that corresponds to the water distribution core is replaceably attached to the tip of this spindle. Then, by tightening the handle, the stretcher head is lowered together with the spindle, and the metal sleeve is pushed into the resin sleeve and crimped to the water distribution hole, etc.

As mentioned above, to ensure the performance of the water distribution core, the metal sleeve needs to be properly pressed into the resin sleeve in the temporary assembly state. However, since it is not possible to visually check the state of the metal sleeve from the outside, in the past, the degree of insertion was adjusted by changing the tightening torque of the handle or the rotation angle of the handle.

However, this method relied heavily on the experience and intuition of the worker, and the metal sleeve was easily pressed in too tightly or too tightly. In particular, because the detailed shapes and dimensions of water distribution cores differ from manufacturer to manufacturer, the amount of tightening of the handle had to be finely adjusted each time, which required considerable skill.

The applicant therefore invented an insertion device that lowers an insertion rod that moves up and down by rotating a horizontally rotating handle, and inserts a water distribution core into a water distribution hole of a water main pipe through a water distribution valve using a stretcher head attached to the lower end of the insertion rod, and is configured so that the upper part (head) of the insertion rod protrudes from the cap when the handle is tightened a certain amount (Patent Document 6). With this insertion device, the protruding part of the head of the insertion rod from the cap can be used as an indicator to grasp the degree to which the water distribution core is inserted, allowing for a consistent insertion mode without relying on experience or intuition.

Japanese Utility Model Application Publication No. 7-23892 JP 2001-304487 A JP 2006-10047 A JP 2017-194096 A Japanese Patent Application Laid-Open No. 10-180648 JP2019-107705A

Diversion valves are available in multiple sizes, such as nominal diameters of 20, 25, 30, 40, and 50, depending on the size of the water main pipe, and diversion cores are also available in sizes that correspond to the nominal diameter of the diversion valve. The load required to insert the diversion core into the diversion hole of the water main pipe (the load required to press the provisionally assembled metal sleeve into the resin sleeve) differs for each size, and the larger the size of the diversion core, the greater the insertion load.

However, the insertion device in Patent Document 6 is only compatible with water distribution cores of a limited size, so the insertion of water distribution cores of other sizes still relies on the experience and intuition of the worker. This issue is also common to water distribution cores, which have different insertion loads depending on the manufacturer.

In addition, the inserter of Patent Document 6 allows the handle to be tightened even after the head of the insertion rod protrudes an appropriate amount from the cap, so there is a risk that the water distribution core will deform or buckle due to such excessive tightening.

The present invention was made to solve the above-mentioned problems, and its purpose is to provide an inserter that can be used with multiple types of water distribution cores that have different insertion loads.

In order to achieve the above-mentioned object, the present invention provides an inserter for inserting a water distribution core watertightly into a water distribution hole drilled in a water pipe through a water distribution valve, the inserter comprising: a horizontally rotating handle; a feed screw mechanism that screws into a screw portion fixed to the water distribution valve side to convert the horizontal rotation of the handle in the tightening direction into a downward movement along the rotation axis; an insertion rod that moves down on the rotation axis of the handle to insert the water distribution core attached to the lower end side into the water distribution hole; a spring that compresses the water distribution core between the handle and the insertion rod by tightening it downward by the feed screw mechanism of the handle, and applies the compression load to the water distribution core via the insertion rod as an insertion load; and a reference surface with a hole through which the head of the insertion rod can be freely inserted at the upper part of the handle, and a feed screw mechanism that converts the horizontal rotation of the handle in the tightening direction into a downward movement along the rotation axis of the handle; The insertion load specific to the water distribution core required for watertight insertion into the water hole is set as a reference load, and when the compression load of the spring due to tightening of the handle exceeds the reference load, the head of the insertion rod protrudes outside the reference surface through the hole by a length corresponding to the amount of compression of the spring. The reference load is set based on the largest specific insertion load among multiple types of water distribution cores with different specific insertion loads, and the head of the insertion rod is provided with a standard indicator that allows visual confirmation of protrusion from the reference surface in accordance with the set reference load, while a stopper means is provided to prevent excessive tightening of the handle, which is common to the multiple types of water distribution cores.

In this invention, the water distribution core is inserted according to the same procedure as in the conventional case. When the handle is tightened to a certain extent, the head of the insertion rod protrudes from the reference surface. The operator can visually confirm the standard indicator on the head and stop rotating the handle at that stage, thereby properly completing the insertion of the water distribution core, which is basically the same as the insertion device in Patent Document 6.

However, in the present invention, the reference load at which the standard indicator appears visibly from the reference surface is set based on the largest specific insertion load among multiple types of water diversion cores, so that if tightening of the handle is stopped when the standard indicator is visually confirmed, proper insertion work can be completed for multiple types of water diversion cores. Even if the reference load of the present invention is set as described above, the applicant's verification showed that the water diversion core with the smallest specific insertion load did not deform. In addition, after the standard indicator appears visibly from the reference surface, tightening of the handle is permitted to a certain extent, and even if the handle is tightened a little more after that, the torque is absorbed by the spring, so the water diversion core, etc. will not be damaged.

However, if the handle is tightened to a degree that significantly exceeds the standard load, the compression load of the spring increases exponentially, which may cause the water distribution core to deform or buckle. Therefore, in the present invention, a stopper means is provided to prevent such excessive tightening of the handle. In particular, in the present invention, in order to prevent excessive tightening common to multiple types of water distribution cores, it is possible to prevent excessive tightening of the handle before the above-mentioned deformation occurs for all of the multiple types of water distribution cores. Here, "preventing excessive tightening common to multiple types of water distribution cores" means that none of the multiple types of water distribution cores will deform or buckle, or the resin sleeve will break. Specifically, among the multiple types of water distribution cores to which the inserter of the present invention is applied, the water distribution core with the smallest allowable load for insertion can be set as the standard. Note that the allowable load of the water distribution core is not necessarily specified (quantified) due to its intended use, and the allowable load of the water distribution core applied to the water distribution faucet with the smallest nominal diameter is not necessarily the smallest. In cases like this where the allowable load of each water distribution core cannot be known in advance, the applicant's verification has shown that a load of approximately 120% of the reference load (the specific insertion load of the water distribution core applied to the distribution faucet with the largest nominal diameter) can be considered as the minimum allowable load for the multiple types of water distribution cores.

As a specific configuration of the stopper means, it is effective to adopt a mechanical restriction means that forcibly restricts excessive tightening of the handle by abutting a part of the fixed screw part on the water distribution valve side of the handle and the feed screw mechanism. This is because even if the worker overlooks the standard index and tries to tighten the handle more, the tightening of the handle is forcibly restricted when the two come into contact.

Another effective stopper means is a warning restriction means in which an upper limit indicator is provided below the standard indicator on the head of the insertion rod, so that the head can be visually observed to have protruded beyond the standard indicator and beyond the reference plane. In this case, as the handle is tightened, the upper limit indicator will appear from the reference plane after the standard indicator, and if the operator stops tightening the handle when he or she visually recognizes these two indicators, the deformation of the water distribution core is prevented and the proper insertion state is ensured, just like the mechanical restriction means described above. The stopper means can be configured as a warning restriction means using the upper limit indicator alone, but it is more preferable to use it in combination with the mechanical restriction means described above as a double restriction means. When the mechanical restriction means restricts the tightening of the handle, the operator can visually recognize the upper limit indicator and understand that the fact that the handle cannot be rotated any further is not a problem but is normal due to the mechanical restriction means.

To make these standard and upper limit indicators easy and reliable to see, it is preferable that they are annular grooves around the head of the insertion rod, and more preferably, this groove is painted with a pigment or paint, or colored by sputtering. In particular, if phosphorescent pigment or luminous paint is used, the indicators can be reliably seen even in the dark.

The insertion rod of the present invention can of course be replaced with several different stretcher heads that correspond to the distribution cores that match the nominal diameter of the distribution valve. In addition, by applying attachments of different heights for each nominal diameter between the part that fixes the device to the distribution valve (the fixed screw part in the feed screw mechanism) and the distribution valve, it is possible to absorb the different insertion strokes for each distribution valve and each distribution core.

The present invention can be used with multiple types of water distribution cores that have different insertion loads depending on the nominal diameter and manufacturer of the water distribution valve.

In addition, excessive tightening is regulated by the stopper means, preventing deformation of any of the multiple types of water distribution cores, and ensuring proper insertion of the water distribution core according to the standard load.

Assembly diagram of an inserter according to one embodiment of the present invention An explanatory diagram showing the procedure for inserting the water distribution core (initial stage of work) An explanatory diagram showing the procedure for inserting the water distribution core (standard operation) An explanatory diagram showing the procedure for inserting the water distribution core (at the upper limit) Diagram of water distribution core Correlation diagram between insertion load and displacement of water distribution core for each nominal diameter of water distribution valve FIG. 1 is an assembly diagram of an inserter according to another embodiment of the present invention;

A preferred embodiment of the present invention will now be described with reference to the attached drawings. Figure 1 is an assembly diagram of an inserter showing one embodiment of the present invention, and Figures 2 to 4 are explanatory diagrams showing the operating procedure, in which 1 is the inserter body, 2 is the stretcher head, 3 is the insertion rod, 4 is the handle body, 5 is the spring, 6 is the cap, 7 is the indicator, and 8 is the cover.

To explain each component in detail, first, the inserter body 1 is a hollow cylinder with an insertion hole 1a for the insertion rod 3 in the middle. Three O-rings 1b are provided in the insertion hole 1a, one above the other, to ensure watertightness while allowing the insertion rod 3 to slide up and down. A nut portion 1c is provided at the lower end opening of the insertion hole 1a, and the inserter body 1 is fixed to the upper opening S1 of the saddle branch tap S directly or via an attachment 9, which will be described later. In this embodiment, the inserter body 1 is described as being fixed to the saddle branch tap S via the attachment 9. The upper end opening of the inserter body 1 is provided with a female thread portion 1d into which the male thread of the handle body 4, which will be described later, screws.

The stretcher head 2 is attached to the lower end of the insertion rod 3 and is the part that inserts the water distribution core C in a crimped state into the lower opening S2 of the saddle water distribution valve S and the water distribution hole P1 of the water main P.

This stretcher head 2 is used by attaching a corresponding water distribution core C to the lower end of the insertion rod 3 as appropriate, but these stretcher heads 2 and water distribution cores C can be conventionally used, and the insertion method is the same as before.

In contrast, the water distribution core C, as shown in Figure 5, is composed of a resin sleeve C1 and a metal sleeve C2. The resin sleeve C1 is made of, for example, polyethylene, and has a first contact portion C1a at the bottom that corresponds to the water distribution hole P1 of the water main P, and a second contact portion C1b at the top that corresponds to the lower opening S2 of the saddle water distribution valve S. The lower opening of the first contact portion C1a is tapered, and the second contact portion C1b has a larger diameter than the first contact portion C1a via a step portion C1c. In addition, a ring-shaped locking groove C1d is provided around the upper inner surface of the second contact portion C1b.

Meanwhile, the metal sleeve C2 is made of, for example, stainless steel, and has a step C2a at its lower end opening that engages with the step C1c of the resin sleeve C, and an expanded diameter portion C2c whose outer circumferential surface expands from this point via a straight portion C2b that has a uniform diameter both inside and outside. In addition, an annular ridge C2d that engages with the engagement groove C1d of the resin sleeve C is provided on the base end outer circumferential surface of the expanded diameter portion C2c.

The water distribution core C is initially in a provisionally assembled state with the metal sleeve C2 fitted into the resin sleeve C1 in one step by the locking portion of the structure described above (see FIG. 5(a)), and is held in this provisionally assembled state by the stretcher head 2. Then, during the insertion operation, it is pushed into the stretcher head 2, and the metal sleeve C is pressed into the resin sleeve C1 (see FIG. 5(b)). This pressing of the metal sleeve C causes the resin sleeve C1 to expand, and the first and second contact portions C1a and C1b are pressed against the inner surfaces of the water distribution hole P1 of the water main P and the lower opening S2 of the saddle water distribution valve S, respectively, resulting in a watertight insertion state.

Next, the insertion rod 3 has a head attachment portion 3a at its lower part, a body portion 3b of a fixed length with a diameter corresponding to the insertion hole 1a of the inserter body 1, and an upper part, via a diameter-reducing step 3c, which is a shaft portion 3d with a smaller diameter than the body portion 3b and through which a spring (coil spring) 5 is inserted. At this time, the diameter-reducing step 3c serves as a spring receiver on the lower side of the spring 5. In addition, a male screw portion 3e is provided at the upper end of the shaft portion 3d into which the cylindrical indicator portion 7 screws.

The indicator part 7 that screws into the male screw part 3e of the insertion rod 3 constitutes the head of the insertion rod 3, and its outer wall is provided with two stages: a standard indicator A as the first indicator, and an upper limit indicator B below it as the second indicator. These indicators A and B are, for example, composed of annular marks, and in this embodiment, the marks are composed of grooves, and in order to make them easy and reliable for the worker to see, the grooves are painted with paint or pigment, or sputtered, to make them colored grooves. Furthermore, as a more preferable configuration example, different colors may be used, such as yellow for the standard indicator A and red for the upper limit indicator B.

Next, the handle body 4 functions as the rotation axis of the pair of rod-shaped handles 4a attached to the left and right sides of the handle body 4, which allows the handles 4a to rotate horizontally around the insertion rod 3 as a central axis. In other words, the insertion rod 3 moves up and down on the rotation axis of the handle 4a. The handle body 4 has a top plate portion 4c with a hole formed in it, which has a through hole 4b through which the upper shaft portion 3d of the insertion rod 3 passes, and the space below serves as the storage portion 4d for the spring 5. In this case, the lower inner surface of the top plate portion 4c serves as the upper spring receiver for the spring 5. In addition, a male screw portion 4e is provided on the outer periphery of the storage portion 4d directly below the handle 4a, into which the cover 8 screws.

Furthermore, a male screw 4f with a tapered lower end is provided below the male screw portion 4e. This male screw 4f screws into the female screw 1d of the inserter body 1, and when the handle 4a is rotated horizontally, it raises and lowers the handle body 4 along the horizontal rotation axis (synonymous with the central axis of the device). In other words, in this embodiment, the female screw 1d as the screw portion fixed to the water faucet side and the male screw 4f of the handle body 4 form a feed screw mechanism.

The spring 5 is a coil spring with a load capacity of, for example, about 100N, and is housed in the housing 4d of the handle body 4 together with the upper and lower flat washers 5a, with the shaft 3d of the insertion rod 3 inserted through its center. The spring 5 then uses the top plate 4c of the handle body 4 and the reduced diameter step 3c of the insertion rod 3 as spring receivers, and expands and contracts with the raising and lowering of the handle body 4, and in particular has the function of applying (transmitting) the compressive load caused by rotating the handle 4a forward to lower the handle body 4 as an insertion load to the water distribution core C via the insertion rod 3.

Next, the cap 6 is fixed to the top of the handle body 4 by screwing or the like, and a hole 6a is formed at the top of the cap 6 so that the indicator part 7 (the head part of the insertion rod 3) can be freely inserted therethrough.

The cover 8 also has a female threaded portion 8a at its upper part that screws into the male threaded portion 4e of the handle body 4, and a cylindrical portion 8b at its lower part that has an inner diameter that matches the diameter of the outer peripheral wall of the upper end opening of the inserter body 1. When all the components are assembled, the cover 8 functions as a guide member that suppresses wobbling so that the handle body 4 can be raised and lowered accurately.

The assembly procedure for each of the above components is as follows: insert the main body 3b of the insertion rod into the inserter body 1, insert the spring 5 into the upper shaft 3d and pass it through the through hole 4b of the handle body 4, attach the indicator 7 to the shaft 3d, and attach the handle 4a, cap 6, and cover 8 to the handle body 4 to complete the assembly.

Attach the stretcher head 2 that fits the water distribution core C to be inserted to the inserter assembled as described above, set the water distribution core C in a provisionally assembled state on the stretcher head 2, and then fix the inserter body 1 to the saddle water distribution valve S via the attachment 9, and the water distribution core C is ready to be inserted (see Figure 2).

When the handle 4a is rotated in the forward direction from the state shown in FIG. 2, the handle body 4 rotates in the same direction, and the handle body 4 descends due to the feed screw mechanism consisting of the male screw 4f and the female screw 1d of the inserter body 1. When the handle body 4 starts to descend, the insertion rod 3 also begins to descend via the spring 5. Then, when the water distribution core C set in a provisionally assembled state on the stretcher head 2 is engaged with the branch hole P1 of the water main P by the descent of the insertion rod 3, the spring 5 begins to compress as the handle body 4 descends. Of course, when the provisionally assembled water distribution core C is engaged with the branch hole P1 at the initial stage shown in FIG. 2, the spring 5 begins to compress at the same time as the handle 4a starts to rotate forward. In other words, the descent of the insertion rod 3 is suppressed by the water distribution core C being engaged with the branch hole P1, so the compression amount of the spring 5 gradually increases thereafter, and the amount of descent of the insertion rod 3 becomes smaller than the amount of descent of the handle body 4. Therefore, as the handle 4a is tightened, the amount of compression of the spring 5 increases, and the reaction force, i.e., the compressive load, acting on the water distribution core C via the insertion rod 3 gradually increases. When this compressive load exceeds the insertion load specific to the water distribution core C, the metal sleeve C2 of the water distribution core C is completely pressed into the resin sleeve C1, and the water distribution core C is properly inserted and watertight into the water distribution hole P1 (Figure 3).

In this way, the more the handle 4a is tightened, the more the compression of the spring 5 increases, and the handle body 4 descends ahead of the insertion rod 3, so the cap 6 fixed to the handle body 4 also descends ahead of the insertion rod 3. In other words, the head (index part 7) of the insertion rod 3 is displaced upwards relative to the cap 6, which descends first, and eventually protrudes outward from the hole 6a of the cap 6.

In this embodiment, when the proper insertion state shown in FIG. 3 is reached, the standard indicator A of the indicator portion 7 protrudes outside the cap 6. Therefore, the operator can complete the insertion operation by stopping tightening the handle 4a when the standard indicator A can be visually confirmed using the upper end surface 6b with the hole 6a of the cap 6 as the reference plane.

In the above embodiment, the insertion of the water distribution core C to be applied to a water distribution valve S with a nominal diameter of 50 mm was described. However, there are multiple types of water distribution valves with nominal diameters of 20 mm, 25 mm, 30 mm, and 40 mm, and the corresponding water distribution cores also differ in size, etc., depending on the nominal diameter of the water distribution valve. In the present invention, the load required to insert the water distribution core watertightly is defined as the insertion load specific to that water distribution core, but this specific insertion load also differs for each water distribution core. In other words, in the applicant's verification, the specific insertion load increases for water distribution valves with larger nominal diameters, as shown in Figure 6.

Therefore, in this embodiment, as soon as the insertion of the water diversion core is completed, the standard index A of the index section 7 becomes visible due to the difference in the amount of descent of the handle body 4 and the insertion rod 3. The compression load of the spring 5, which is indicated as the compression amount of the spring 5 at that time, is set as a standard load that is slightly larger than the maximum load of the specific insertion load for the water diversion core C corresponding to the nominal diameter 50, which has the largest specific insertion load among the water diversion cores with nominal diameters 20 to 50 shown in Figure 6 (the maximum insertion load indicated by the dot in Figure 6).

By setting it up in this way, even if this device is used with a water distribution core for a different nominal size with a smaller specific insertion load, the amount of compression of spring 5 after insertion is complete will not change, making it possible to perform the insertion work with a compression load that exceeds the specific insertion load for each, and at the same time, as shown in Figure 3, it will be possible to visually check the standard indicator A. In other words, this device can be used for water distribution cores of any nominal size. Therefore, it can also be used for multiple types of water distribution cores with different specific insertion loads between manufacturers.

On the other hand, it is possible to further tighten the handle 4a from the state shown in Figure 3, but even if it is tightened a little more, the load is absorbed by the spring 5 being further compressed, so it does not damage the water distribution core C, etc.

However, if the operator overlooks the standard index A and tightens the spring 5 excessively, causing the compression load to significantly exceed the reference load (in this embodiment, the insertion load specific to the water diversion core C), the water diversion core C will deform or, in the worst case, buckle. Therefore, in this embodiment, when the handle 4a is tightened further by a certain amount from the state shown in FIG. 3, the lower surface 4g' of the flange portion 4g forming the male thread portion 4e of the handle main body 4 abuts against the upper end 1' of the inserter main body 1, as shown in FIG. 4. This provides a first stopper means (mechanical restriction means) that mechanically restricts further tightening of the handle 4a.

At the same time, the index portion 7 constituting the head of the insertion rod 3 is provided with an upper limit index B as a second stopper means (attention-calling restriction means) below the standard index A. Specifically, the first stopper means mechanically restricts tightening of the handle 4a, and at the same time, the compression load of the spring 5 when the upper limit index B emerges from the cap 6 is set as an upper limit load indicated by a load of approximately 120% of the standard load, as shown together with the standard load in Figure 6.

Therefore, in the state shown in Figure 4, further tightening of the handle 4a is mechanically restricted, which prevents deformation of the water distribution core C, and by visually checking the upper limit indicator B, the operator can correctly understand that proper insertion has already been completed and that improper tightening of the handle 4a is now restricted.

The standard indicator A and the upper limit indicator B each have a different color to make them easier for the worker to see, and by using different colors, each indicator can be easily distinguished.

The above embodiment is an example of a saddle diverter tap S with a nominal diameter of 50 mm, as mentioned above, but for saddle diverter taps with other nominal diameters, the basic structure of this device can be used as is by replacing it with an attachment that corresponds to the height. In this case, for the saddle diverter tap with the smallest nominal diameter, the attachment can of course be omitted and the inserter main body 1 can be fixed directly to the saddle diverter tap.

Figure 7 shows another embodiment of the present invention, which omits the cap 6 and indicator portion 7 employed in the above embodiment, but instead provides a standard indicator A and an upper limit indicator B directly on the top of the shaft portion 3d of the insertion rod 3 (the head portion of the insertion rod 3). The rest of the configuration is the same as in the above embodiment. In this embodiment, the upper end surface of the top plate portion 4c of the handle body 4 is used as the reference surface 4c', and the insertion operation can be completed by stopping the tightening of the handle 4a when the standard indicator A can be seen, and when further tightening, the upper limit indicator B can be seen to recognize that proper insertion has already been completed, similar to the above embodiment.

1 Inserter body 1e Female screw (feed screw mechanism)
2 Stretcher head 3 Insertion rod 4 Handle body 4a Handle 4b Through hole 4c' Top plate portion with hole (reference surface)
4f Male screw (feed screw mechanism)
5 Spring 6 Cap 6a Hole 6b Upper end surface of cap with hole (reference surface)
7. Indicator part A: Standard indicator (first indicator)
B. Upper limit index (second index)
8 Cover 9 Attachment C Water distribution core C1 Resin sleeve C2 Metal sleeve S Saddle water distribution valve P Water main P1 Water distribution hole

Claims (7)

An insertion device for watertightly inserting a water distribution core into a water distribution hole drilled in a water pipe through a water distribution valve, which can be used with multiple types of water distribution cores that have different specific insertion loads required for watertight insertion into the water distribution hole due to differences in detailed shapes and dimensions,
A horizontally rotating handle,
A feed screw mechanism that screws into a screw portion fixed to the water distribution valve side to convert the horizontal rotation of the handle in the tightening direction into downward motion along the rotation axis;
An insertion rod that can be lowered on the rotation axis of the handle to insert the water distribution core attached to the lower end side into the water distribution hole;
A spring that is compressed between the insertion rod by the downward tightening of the handle by the feed screw mechanism, and applies the compression load to the water distribution core as an insertion load via the insertion rod;
The upper part of the handle is provided with a reference surface with a hole through which the head of the insertion rod can be freely inserted,
The largest specific insertion load among the multiple types of water distribution cores is set as the standard load, and when the compression load of the spring due to tightening of the handle becomes equal to or greater than the standard load,BeforeHead of the insertion rodThe first indicator established inis configured to protrude outside the reference surface through the hole.,
A stopper means for preventing excessive tightening of the handle, which is common to the plurality of types of water distribution cores, is provided.FurthermoreA water distribution core inserter characterized by having The water distribution core inserter according to claim 1, wherein the reference surface is the upper end surface with a hole of the cap that is fixed to the top of the handle. The water distribution core inserter according to claim 1, wherein the reference surface is the upper end surface with a hole of the handle body, which is the rotation axis of the handle. The water distribution core inserter according to claim 1, 2 or 3, in which the stopper means is a mechanical restriction means that restricts excessive tightening of the handle by abutting a part of the fixed screw part on the water distribution valve side of the handle and the feed screw mechanism. The stopper means is a warning restriction means having a second indicator below the first indicator on the head of the insertion rod, which is used to visually check that the head has protruded beyond the first indicator and beyond the reference plane. A water distribution core inserter as described in any one of claims 1 to 4. The inserter for a water distribution core according to claim 5, wherein the first indicator and/or the second indicator is an annular groove provided around the head of the insertion rod. The inserter for a water distribution core according to claim 6, in which the groove is colored.

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