JP4531479B2 - Anticorrosion sleeve - Google Patents

Description

  In the present invention, when installing a water faucet for branching from a main pipe such as a water pipe to a branch pipe, when a hole serving as a water inlet is drilled in a metal pipe as a main pipe, the cutting surface of the hole wall The present invention relates to an anti-corrosion sleeve to be attached to prevent corrosion.

  Conventionally, as this type of anti-corrosion sleeve, a metal sleeve made of stainless steel or the like is inserted into a resin sleeve to form an anti-corrosion sleeve. For example, as shown in FIG. 6, the sleeve body 20 is inserted into the perforated hole 22 provided in the metal main pipe 21, and among these, the elastic sleeve 24 mounted on the outer periphery of the resin sleeve 23 is used as the cutting surface of the perforated hole 22. When the anticorrosion sleeve 20 is mounted, a dedicated tool 26 is prepared, and the dedicated tool 26 with the metal sleeve 25 and the resin sleeve 23 is provided on the perforated hole 22. Then, the resin sleeve 23 is positioned on the hole wall, and then the dedicated tool 26 is further pushed in, so that the metal sleeve 25 is inserted into the resin sleeve 23, and the resin sleeve 23 whose diameter has been increased accordingly. Accordingly, the corrosion of the cutting surface is prevented by the close contact of the elastic sleeve 24 to the cutting surface.

  By mounting the anticorrosion sleeve 20 as described above, the resin sleeve 23 is tightly locked from the main pipe perforation hole 22 to the water passage opening (bush portion) 27 of the water faucet body, but the water faucet having a relatively large diameter. (For example, 50A), the inner diameter of the water faucet bush portion 27 is larger than the diameter 28a of the ball valve body 28, particularly for ensuring the diameter of the water passage so that the insertion with the dedicated tool 26 can be performed smoothly. Therefore, the resin sleeve 23 must be greatly expanded so as to be in close contact with the bush portion 27.

  When the shape of the metal sleeve 25 for expanding the diameter of the resin sleeve 23 is a straight shape having a constant outer diameter as shown in FIG. 6, the entire resin sleeve 23 is expanded at the same diameter expansion rate. Become. Therefore, in order to expand the diameter of the contact portion (cylinder portion) 23a of the resin sleeve 23 that is in close contact with the perforated hole 22 through the elastic sleeve 24 at the same expansion ratio as that of the contact portion 23b with the bush portion 27, the diameter is increased. It was possible to cope by making it small.

  However, by reducing the diameter of the contact portion 23 a of the resin sleeve 23, when the metal sleeve 25 is inserted into the resin sleeve 23, the insertion resistance increases, and the tip of the metal sleeve 25 is attached to the resin sleeve 23. It bites into the inner diameter of the contact portion 23a or buckles the resin sleeve 23, so that a suitable mounting state is not realized, and as a result, the anticorrosive effect cannot be expected. An example of the anticorrosion sleeve used for the water faucet having such a relatively large diameter is shown below.

For example, in the core member described in Japanese Patent No. 2656005 (Patent Document 1), the core member is attached to the water faucet as a bent structure in which the top portion of the core member is expanded outward by pressing and bent. It has a close contact structure by bending, and the insertion rod on which the core member is mounted is provided with an enlarged diameter part that is slightly larger than the inner diameter of the core member and has a tapered surface at the lower part. It is disclosed as a configuration in which the entire core member is expanded in diameter by press-fitting the expanded-diameter portion after being inserted into the portion, and the entire outer peripheral surface of the core member is pressed against the water faucet water passage and the main pipe perforated wall.
Japanese Patent No. 2565005

  However, in the core member described in Japanese Patent No. 2656005 (Patent Document 1), it is possible to press the hole wall and the bush of the hole having different diameter expansion ratios by simply lowering the insertion tool attached to the insertion rod. The mounting workability is good in that it is possible, but because it is a bent structure that widens the top of the metal core member to the outside, the mounting work requires a lot of force and the mounting is appropriate It was not easy to see if it was done. In addition, this bent structure is easily affected by stress, and is in line contact with the inner peripheral surface of the water faucet through-hole, making it difficult to maintain a strong pressure contact state. Could not be maintained. Furthermore, the manufacturing process of a core member has a problem also in economical efficiency by the manufacturing method of the dimensional accuracy for making it bend appropriately, its management, etc.

  In view of the above-mentioned problems, the present invention has been developed as a result of earnest research, and its purpose is to easily attach to a perforated hole provided in a main pipe such as a water pipe, An object of the present invention is to provide an anticorrosion sleeve that can be reliably performed and can exhibit its excellent anticorrosive effect over a long period of time.

In order to achieve the above object, the invention according to claim 1 is configured such that a rigid sleeve is inserted from an opening of a sleeve body provided with a resin sleeve having a good sliding property and a large elongation property on the inner diameter side of the elastic sleeve, An anti-corrosion sleeve that expands the diameter of the resin sleeve and simultaneously expands the elastic sleeve so that the elastic sleeve is in close contact with the cut surface portion of the hole wall of the hole for mounting, and the rigid sleeve has a small diameter portion in order from the insertion direction. And a large-diameter portion, and by inserting the small-diameter portion, an elastic sleeve is brought into close contact with the cutting surface portion of the hole wall of the perforated hole, and by inserting the large-diameter portion, a resin is formed on the inner peripheral surface of the water faucet water inlet. together brought into close contact with the flange portion provided at the upper end portion of the sleeve, the diameter expansion ratio of the adhesion sites of the elastic sleeve expanded by the insertion of the small diameter portion of said rigid sleeve and alpha, due to the insertion of the large-diameter portion of the rigid sleeve When the diameter ratio of the contact portion of the enlarged diameter to the resin sleeve was set to beta, a corrosion protection sleeve was set to be alpha <beta.

  The invention according to claim 2 is an anticorrosion sleeve in which a bush portion is disposed at the water faucet water passage and an inner peripheral surface of the water passage is formed.

The invention according to claim 3 is the anticorrosion sleeve in which the expansion ratio α of the contact portion of the elastic sleeve and the expansion ratio β of the contact portion of the resin sleeve are set in the range of 4.0 to 9.0%, respectively. It is.

According to the present invention , there is provided an anticorrosion sleeve that can be easily and surely attached to a main pipe perforation hole and a faucet water inlet, and can exhibit its excellent anticorrosive effect over a long period of time. It becomes possible to provide. Furthermore, the resistance at the time of inserting the rigid sleeve into the resin sleeve is reduced by optimizing the expansion ratio of the contact portion of the elastic sleeve and the expansion ratio of the contact portion of the resin sleeve by inserting the rigid sleeve. Thus, problems such as the leading end of the rigid sleeve biting into the inner diameter portion of the resin sleeve and buckling of the resin sleeve are solved, and an excellent mounting state can be realized by the present invention. In addition, there is a difference between the feeling of torque when it comes into close contact with the cut surface portion of the hole wall of the hole and the feeling of torque when it comes into close contact with the water faucet passage, so that the operator can determine the progress of the sleeve mounting work. It can be recognized by feeling, and there is an effect that a safe mounting operation without excessive push-in can be performed.

Moreover , since the diameter of the elastic sleeve is kept low and the diameter of the cylindrical portion of the resin sleeve is made larger than the conventional one, in addition to reducing the insertion resistance of the rigid sleeve, the resin sleeve by the rigid sleeve In addition to preventing biting and buckling from occurring in the tube, it is possible to achieve excellent installation in the main hole and the water faucet.

  Below, one embodiment of the anticorrosion sleeve in the present invention is described based on a drawing. FIG. 1 is a cross-sectional view showing a state in which the anticorrosion sleeve according to the present invention is attached to a water main pipe / water faucet. In the figure, reference numeral 1 denotes a sleeve body, which is provided with a resin sleeve 3 composed of a resin cylinder layer having good sliding characteristics and large elongation characteristics on the inner diameter side of an elastic sleeve 2 made of rubber or the like. By inserting the rigid sleeve 4 formed through the opening 5, the diameter of the resin sleeve 3 is expanded and the elastic sleeve 2 is expanded at the same time, and the cutting surface portion of the hole wall 7 a of the perforated hole 7 provided in the metal main pipe 6 is The elastic sleeve 2 functions to be in close contact with the anticorrosion. As described above, the resin sleeve 3 having a good sliding characteristic is used to facilitate the insertion of the rigid sleeve 4 on the inner diameter side of the elastic sleeve 2, and the elongation characteristic is increased to cause a crack. It is for making it easy to expand the diameter. Ensuring both of these characteristics is realized, for example, by manufacturing the resin sleeve 3 from low-density polyethylene or the like. The rigid sleeve 4 may be made of a rigid hard resin other than those made of metal such as stainless steel.

  In this embodiment, a mortar lining layer or a resin lining layer 6 a is formed on the inner surface of the metal main pipe 6, and a saddle 9 and a band 10 are fixed to the outer surface via bolts and nuts 8. In the figure, 11 is a water faucet with a saddle, which has a branch part 13 having a joint part 13a for connecting a branch pipe, and has a water stop for branching from the main pipe 6 to the branch pipe. The mechanism 14 is incorporated. The water stop mechanism 14 includes a ball 14a having a T-shaped through hole, a stem 14b in which the ball 14a is rotatably provided, and a pair of ball sheets 14c and 14c. In the figure, reference numeral 15 denotes an O-ring attached to the outer peripheral surface of the upper end of the resin sleeve 3. Reference numeral 16 in the drawing denotes a rubber seal member (hereinafter referred to as a gasket), which functions to seal the saddle 9 and the main pipe 6. In the figure, reference numeral 17 denotes a bush portion, which has a function of preventing the water passage diameter from being reduced due to deformation of the gasket 16. In addition, although the water faucet water inlet 12 shown in this example has a configuration in which the bush portion 17 is provided, the present invention is also applicable to a structure that does not use the bush portion 17 (water faucet water inlet). Of course.

  FIG. 2 is a cross-sectional view of a half sleeve showing the resin sleeve of the present invention. As shown in FIG. 2, a flange portion 3a is provided at the upper end portion of the resin sleeve 3, and the inner circumferential surface of the flange portion 3a is opened. A protrusion 3b is formed in the vicinity of the upper end of the sleeve, and a temporary assembly is formed by engaging with a locking groove 4e formed on the outer peripheral surface of the distal end on the insertion side of the rigid sleeve 4 described later. The hole 7 has a structure capable of being adhered to the cut surface portion of the hole wall 7a. Further, a step with a small diameter portion provided by reducing the diameter of the tip side of the protrusion portion 3b of the resin sleeve 3 is a tapered step portion 3c, so that the rigid sleeve 4 inserted into the taper step portion 3c from the opening 5 is provided. When the tip 4g comes into contact, the projection 3b of the resin sleeve 3 and the locking groove 4e of the rigid sleeve 4 are engaged to form a temporary assembly, and the rigid sleeve 4 is aligned and inserted. It also has a function to do. In addition, a cylindrical portion 3f having an elastic sleeve 2 attached to the outer periphery is provided at an intermediate portion of the resin sleeve 3, and a claw portion 3d inclined toward the inner diameter side is provided at the lower end of the resin sleeve 3. In the figure, 3e is a tapered surface portion provided on the lower surface of the flange portion 3a, and has a centering function while preventing deformation and sagging when the rigid sleeve 4 is inserted. In the figure, 3 g is a mounting groove for mounting the O-ring 15.

  FIG. 3 is a half-sectional view showing a rigid sleeve of the present invention. As shown in FIG. 3, the rigid sleeve 4 has a small diameter portion 4a and a large diameter portion 4b in order from the insertion direction. The elastic sleeve 2 is brought into close contact with the hole wall 7a of the main pipe perforation hole 7 by inserting 4a, and the flange portion 3a of the resin sleeve 3 is attached to the bush portion 17 of the water faucet water inlet 12 by inserting the large diameter portion 4b. Functions to adhere. A stepped portion with the small diameter portion 4a is a tapered step portion 4c, and a cylindrical portion 3f of the expanded resin sleeve 3 is formed on the outer peripheral surface of the small diameter portion 4a with a groove portion 4d that is press-fitted and adhered by its restoring force. Thus, the rigid sleeve 4 and the resin sleeve 3 function to hold the position more firmly. A locking groove 4e is formed on the outer peripheral surface of the distal end on the insertion side of the rigid sleeve 4, and as described above, the engaging groove 4e is engaged with the protrusion 3b formed on the inner peripheral surface of the opening of the flange portion 3a of the resin sleeve 3. It functions as a set. In the figure, 4 f is a flange formed at the open end of the rigid sleeve 4.

  In this embodiment, the resin corresponding to the close contact portion between the diameter expansion rate α of the elastic sleeve 2 corresponding to the close contact portion of the main wall drilling hole 7 with the cutting surface of the hole wall 7a and the bush portion 17 provided in the water faucet water inlet 12. The diameter expansion rate β of the sleeve 3 (the flange portion 3a) is set to have a relationship of α <β. Since the diameter expansion rate α of the elastic sleeve 2 is kept low and the diameter of the cylindrical portion 3f of the resin sleeve 3 is made larger than that of the conventional one, the insertion resistance of the rigid sleeve 4 (small diameter portion 4a) is reduced. In addition, the rigid sleeve 4 prevents biting and buckling of the resin sleeve 3 into the cylindrical portion 3f, and realizes excellent mounting to the main pipe perforation hole 7 and the water faucet water inlet 12. The diameter expansion rate refers to an increase in the outer diameter after the expansion with respect to the outer diameter before the expansion in each of the contact portions.

  The expansion ratio α of the elastic sleeve 2 and the expansion ratio β of the resin sleeve 3 (the flange portion 3a) are preferably suppressed to 4.0 to 9.0%, respectively, and in particular, the expansion ratio is about 6%. Is preferable. Below 4.0%, when the anticorrosion sleeve is inserted into the main drilling hole 7, the elastic sleeve 2 before diameter expansion comes into contact with the hole wall 7a of the main drilling hole 7 and it is difficult to attach the anticorrosion sleeve. It becomes. On the other hand, if it exceeds 9.0%, the insertion resistance of the rigid sleeve 4 increases, and there is a possibility that the resin sleeve 3 is bitten or buckled. In the anticorrosion sleeve of this embodiment, the expansion ratio α of the elastic sleeve 2 is about 4.5%, and the expansion ratio β of the resin sleeve 3 (the flange portion 3a) is about 6.5%.

  Next, a procedure for temporarily assembling the anticorrosion sleeve in the present invention will be described. Note that the mounting tool 18 used in the present embodiment has a first taper 18a and a second taper 18b from the front end side, and the first taper 18a is a resin when the temporarily assembled sleeve body 1 is attached. The claw portion 3d provided at the tip of the sleeve 3 is locked, and the second taper 18b gradually increases the diameter of the resin sleeve 3 from the flange portion 3a to the tip, thereby smoothly inserting and expanding the diameter by the rigid sleeve 4. It functions as can be done.

  First, the rigid sleeve 4 is inserted from the opening 5, and the leading end 4 g of the rigid sleeve 4 is brought into contact with the tapered step 3 c formed on the inner peripheral surface of the resin sleeve 3. At this time, the protrusion 3b of the resin sleeve 3 and the locking groove 4e of the rigid sleeve 4 are simultaneously engaged to complete the temporary assembly. As described above, since only the front end (lower end) of the rigid sleeve 4 is pushed into the upper end of the resin sleeve 3, the pushing amount of the rigid sleeve 4 required for temporary assembly becomes small, and the temporary assembly work is facilitated. In addition, the flange portion 3a serving as a seal portion with the bush portion 17 of the water faucet with saddle 11 and the cylindrical portion 3f serving as a seal portion with the perforated hole 7 through the elastic sleeve 2 are expanded in diameter (deformed). ) And does not affect the sealing performance. Further, the tip 4g abuts on the taper step 3c, and the protrusion 3b and the locking groove 4e engage with each other, so that the resin sleeve 3 and the rigid sleeve 4 are respectively held around the entire circumference at two locations. Since they are assembled, the resin sleeve 3 and the rigid sleeve 4 are securely held on the same axis, and the rigid sleeve 4 is smoothly inserted.

  Subsequently, the sleeve main body 1 in which the temporary assembly is made is temporarily fixed to the cylindrical body of the mounting tool 18 to which the operation rod is screwed. At this time, the claw portion 3d provided at the lower end of the resin sleeve 3 is locked to the first taper 18a to prevent the claw portion 3d from coming off from the mounting tool 18, and when the sleeve main body 1 is attached to the mounting tool 18, the sleeve main body 1 Functions so that it can remain level. The sleeve body 1 that has been temporarily assembled is attached to the perforated hole 7 provided in the main pipe 6 via the attachment tool 18.

  Next, a procedure for attaching the anticorrosion sleeve to the water faucet / metal main pipe according to the present invention will be described. FIG. 4 is an explanatory view showing a mounting procedure. As shown in FIG. 4A, when the mounting tool 18 is inserted into the perforated hole 7 provided in the metal main pipe 6, the resin sleeve 3 of the sleeve body 1 in the temporarily assembled state attached to the mounting tool 18. The tapered surface portion 3 e provided on the lower surface of the portion is first locked to the hole edge of the hole 7. Thereby, the deformation | transformation and fall at the time of insertion of the rigid sleeve 4 can be prevented, and also a high sealing performance can be ensured. Further, the inclination angle of the tapered surface portion 3e is set in a range of 10 to 45 degrees, and when the inclination angle is 10 degrees or less, it is not sufficient to prevent the deformation of the resin sleeve 3, and If the angle is 45 degrees or more, the alignment function that works at the time of insertion into the perforated hole 7 may be insufficient, and it is preferably set in a range of about 10 to 30 degrees.

  As described above, since the rigid sleeve 4 and the resin sleeve 3 that have been temporarily assembled are aligned, the diameter of the resin sleeve 3 (and the elastic sleeve 2) from the temporarily assembled state is increased. By the smooth insertion of the rigid sleeve 4 that does not cause a deviation or the like, suitable diameter expansion is sequentially performed. As shown in the drawing, the rigid sleeve 4 (tip portion 4g having an outer peripheral surface taper shape) is positioned above the extension line of the second taper 18b of the mounting tool 18, whereby the resin sleeve 3 is first attached to the mounting tool. After the diameter is increased by the second taper 18b, the diameter of the rigid sleeve 4 is further increased by the insertion of the rigid sleeve 4 along with the insertion of the mounting tool 18, and the smooth insertion of the rigid sleeve 4 is realized.

  As shown in FIG. 4B, when the mounting tool 18 is further inserted, the engagement state between the first taper 18a of the mounting tool 18 and the claw portion 3d of the resin sleeve 3 is released, and then the pressing of the mounting tool 18 is continued. The portion 18 c comes into contact with the flange portion 4 f of the rigid sleeve 4. As the mounting tool 18 is inserted, the rigid sleeve 4 is inserted into the resin sleeve 3, and the diameter of the resin sleeve 3 is gradually expanded in the distal direction. As shown in the figure, when inserting the small diameter portion 4 a of the rigid sleeve 4, the outer peripheral surface of the collar portion including the O-ring 15 attached to the outer peripheral surface of the resin sleeve 3 is a bush portion provided in the water faucet water inlet 12. 17 is not in close contact with the inner surface.

  Further, when the rigid sleeve 4 is inserted, the entire sleeve tends to be pushed in the insertion direction along with the insertion of the rigid sleeve 4, but the movement in the insertion direction is prevented by the tapered surface portion 3e. When a force in the insertion direction is applied to the resin sleeve 3 due to friction when the rigid sleeve 4 is inserted, the taper surface portion 3e can be reinforced so as to keep the collar portion 3a in an annular shape. Can be inserted without resistance to ensure a predetermined water passage diameter. In addition, the taper surface portion 3e can make the alignment function work, and can be accurately inserted into the water flow opening that is the perforated hole 7 for mounting. The taper surface portion 3e is made of resin, Since it has a certain degree of compressibility, it can flexibly handle various sizes of pipes with different curvatures.

  When the mounting tool 18 is further inserted, as shown in FIG. 4C, the tapered surface portion 3e provided on the lower surface of the flange portion 3a and the hole wall 7a of the perforated hole 7 come into close contact with each other, and the small diameter portion of the rigid sleeve 4 By inserting 4a, the diameter of the resin sleeve 3 is expanded and the elastic sleeve 2 is expanded at the same time, and the elastic sleeve 2 is brought into close contact with the cutting surface portion of the hole wall 7a of the main drilling hole 7. When the mounting tool 18 is subsequently inserted, the large-diameter portion 4b of the rigid sleeve 4 is inserted into the resin sleeve 3, and the flange portion 3a of the resin sleeve 3 begins to expand, and is mounted on the outer peripheral surface of the resin sleeve 3. The outer peripheral surface of the collar portion including the O-ring 15 is brought into surface contact with the inner peripheral surface of the bush portion 17 to be pressed and closely attached, thereby realizing mounting with a high sealing performance between the resin sleeve 3 and the water stopper 11 with a saddle. . Furthermore, since the corner portion 17a of the bush portion 17 is brought into pressure contact with the outer peripheral surface of the flange portion, the seal surface pressure at this portion is maintained in an increased state.

  Further, as described above, the contact area between the diameter expansion rate α of the elastic sleeve 2 corresponding to the contact portion with the cutting surface of the hole wall 7a of the main hole 7 and the bush portion 17 provided at the water faucet water inlet 12. Corresponding to the small diameter portion 4a of the rigid sleeve 4, the expansion ratio α of the elastic sleeve 2 is kept low, corresponding to the small diameter portion 4a of the rigid sleeve 4. Since the diameter of the cylindrical portion 3f of the resin sleeve 3 is larger than that of the conventional one, in addition to reducing the insertion resistance of the rigid sleeve 4 (small diameter portion 4a), the cylindrical portion of the resin sleeve 3 by the rigid sleeve 4 is used. In addition to preventing biting into 3f and buckling, it is possible to perform excellent mounting on the main pipe perforation hole 7 and the water faucet water inlet 12.

  A bush provided in the water faucet water inlet 12 by inserting the mounting tool 18 to the state shown in FIG. 4 (d), bringing the elastic sleeve 2 into intimate contact with the cutting surface portion of the hole wall 7 a of the main drill hole 7. By attaching the collar outer peripheral surface including the O-ring 15 attached to the outer peripheral surface of the resin sleeve 3 to the inner peripheral surface of the portion 17, the mounting of the sleeve body 1 is completed. When the mounting is completed, the cylindrical portion 3f of the resin sleeve 3 whose diameter is expanded in the groove portion 4d on the outer peripheral surface of the rigid sleeve 4 is press-fitted and adhered by its restoring force. The sleeve 3 is in a state of being more firmly held in position. Further, the locking groove 4e formed on the outer peripheral surface of the distal end on the insertion side of the rigid sleeve 4 is also pressed by the cylindrical portion 3f of the resin sleeve 3, and can function as a retainer. Through the procedure described above, the mounting of the sleeve body 1 to the main pipe 6 and the water faucet 11 is completed, and the cutting surface portion of the hole wall 7a of the hole 7 is excellent due to the anticorrosion sleeve 1 of the present invention. Anti-corrosion effect is realized.

  FIG. 5 is a cross-sectional view showing a state where the mounting of the anticorrosion sleeve according to the present invention is completed. As shown in the figure, the total length of the rigid sleeve 4 is determined by taking the elongation of the resin sleeve 3 into account. Therefore, as shown in the figure, the distal end portion 4g of the rigid sleeve 4 that has been inserted into the resin sleeve 3 is positioned below the distal end of the resin sleeve 3. Thus, the claw portion 3d provided at the tip of the resin sleeve 3 can be surely spread out, so that the tip portion of the resin sleeve 3 does not protrude to the inner diameter side and does not hinder water flow. Further, the claw portion 3d can be locked to the hole edge of the perforation hole 7 when the sleeve body 1 is completely attached to the perforation hole 7, thereby preventing the sleeve main body 1 from coming off. In addition, the resin sleeve 3 of this example is set in accordance with the mortar lining layer 6a (or the resin lining layer) having a small inner diameter, and is shared with the powder lining.

  As another example, the claw portion 3d that is inclined toward the inner diameter provided at the distal end portion of the resin sleeve 3 and the locking groove 4e provided at the distal end portion of the rigid sleeve 4 that has been inserted are all around or one. Also in this case, the mounting state can be firmly maintained, and the rigid sleeve 4 after the insertion is completed can be prevented from coming out of the resin sleeve 3. Can do. Therefore, the locking groove 4e of the rigid sleeve 4 prevents the rigid sleeve 4 from inadvertently coming out of the resin sleeve 3 both in the temporarily assembled state and in the state where the insertion into the resin sleeve 3 is completed. Thus, the anticorrosion effect of the perforated holes 7 can be exhibited over a long period of time.

  According to the anticorrosion sleeve of the present invention, when installing a water faucet for performing branch piping from a main pipe to a branch pipe in every application including water pipes, etc., when a hole serving as a water inlet is drilled in a metal pipe It is possible to provide an anti-corrosion sleeve that realizes an excellent mounting state that reliably prevents corrosion of the exposed metal.

It is sectional drawing which showed the mounting state to the water stopper and metal main pipe of the anti-corrosion sleeve in this invention. FIG. 3 is an enlarged half-sectional view showing a resin sleeve according to the present invention. FIG. 4 is an enlarged half-sectional view showing a rigid sleeve according to the present invention. It is sectional explanatory drawing which showed the attachment procedure to the water stopper and metal main pipe of the anti-corrosion sleeve in this invention. It is the principal part expanded sectional view which showed the mounting state to the water stopper and metal main pipe of the anti-corrosion sleeve in this invention. It is principal part sectional drawing which showed the prior art example.

Explanation of symbols

1 Anticorrosion sleeve (sleeve body)
DESCRIPTION OF SYMBOLS 2 Elastic sleeve 3 Resin sleeve 3a collar part 4 Rigid sleeve 4a Small diameter part 4b Large diameter part 5 Opening part 7 Perforation hole 7a Hole wall 12 Water faucet water inlet 17 Bush part

Claims (3)

A rigid sleeve is inserted from the opening of a sleeve body having a resin sleeve having good sliding characteristics and large elongation characteristics on the inner diameter side of the elastic sleeve, and the elastic sleeve is expanded at the same time as the resin sleeve is expanded. An anti-corrosion sleeve in which the elastic sleeve is in close contact with the cutting surface portion of the hole wall of the mounting hole, wherein the rigid sleeve has a small diameter portion and a large diameter portion in order from the insertion direction, and the insertion of the small diameter portion causes the the resilient sleeve in close contact with the cutting surface portion of the pore walls of the drilled hole, and with adhering the flange portion provided at the upper end portion of the resin sleeve on the inner circumferential surface of the water diversion plug through Mizuguchi by the insertion of the large diameter portion, the rigid The expansion ratio of the contact portion of the elastic sleeve that expands by insertion of the small diameter portion of the sleeve is α, and the expansion ratio of the contact portion of the resin sleeve that expands by insertion of the large diameter portion of the rigid sleeve is β. The anticorrosion sleeve is characterized in that α <β is set .   The anti-corrosion sleeve according to claim 1, wherein a bush portion is disposed in the water faucet water flow port to constitute an inner peripheral surface of the water flow port. Said upset rate of adhesion sites elastic sleeve alpha, as well as corrosion protection sleeve of claim 1, wherein the diameter ratio of the contact sites of the resin sleeve beta, was set in the range of respectively 4.0 to 9.0%.

Images