JP2006046435A - Corrosion resistant sleeve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosion resistant sleeve easily and securely installable in a drilled hole formed in a main tube such as a city pipeline and capable of developing its excellent corrosion resistant effect over a long period of time. <P>SOLUTION: In this corrosion resistant sleeve 1, a rigid sleeve 4 is inserted from the opening 5 of a sleeve body 1 having a resin sleeve 3 with an excellent sliding property and a large elongation property on the inner diameter side of an elastic sleeve 2 to enlarge the resin sleeve 3, and the elastic sleeve 2 is enlarged to fit the elastic sleeve 2 to the cutting surface of the hole wall 7a of a drilled hole 7 for mounting. A flange 3a is formed at the upper end of the resin sleeve 3, and a projected part 3b formed on the opening inner peripheral surface of the flange 3a is engaged with a locking groove 4a formed on the insert side tip outer peripheral surface of the rigid sleeve 4 to bring them into a temporarily assembled state. The corrosion resistant sleeve can be fitted to the drilled hole 7 in this temporarily assembled state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 anticorrosion sleeve to be attached to prevent corrosion.

  Conventionally, as this type of anti-corrosion sleeve, one in which a metal sleeve such as stainless steel is inserted into an elastic sleeve such as a resin to form the anti-corrosion sleeve is known. This is because the sleeve body is inserted into the drilled hole provided in the metal main pipe, and among these, the elastic sleeve is brought into close contact with the cut surface of the drilled hole to prevent corrosion of the cut surface. At the time of installation, a dedicated tool is prepared, and after a separate process, a dedicated tool with a metal sleeve and an elastic sleeve is inserted into the drilling hole. First, the elastic sleeve is set in the drilling hole, and then the dedicated tool is further pushed in. The sleeve main body is mounted by fitting the metal sleeve into the elastic sleeve and closely contacting the cutting surface of the elastic sleeve expanded in diameter.

  As described above, the mounting of the anticorrosion sleeve requires a first step of fitting the metal sleeve around the outer periphery of the dedicated tool that is a cylindrical body, and then a second step of fitting the resin sleeve. In addition to being very troublesome for the user, the attachment of these sleeves to the dedicated tool may be performed in a state in which the attachment direction and order are incorrect. Accordingly, an attempt has been made to simplify the mounting process of the anti-corrosion sleeve and realize proper mounting of the anti-corrosion sleeve, and the following technique is disclosed as an example.

For example, an anticorrosion sleeve described in Japanese Patent Application Laid-Open No. 2001-304487 (Patent Document 1) includes a substantially cylindrical resin sleeve and a metal sleeve that is densely inserted into the inner periphery of the resin sleeve. The metal sleeve has a large-diameter outer periphery, an intermediate outer periphery, and a small-diameter outer periphery in order with respect to the insertion direction. Attach to the dedicated tool with the sleeve combined in advance, fit in the hole in this state, and then push the metal sleeve further inside the resin sleeve so that the anticorrosion sleeve can be attached I have to.
JP 2001-304487 A

  However, in Japanese Patent Laid-Open No. 2001-304487 (Patent Document 1), the pushing amount of the metal sleeve required when combining the resin sleeve and the metal sleeve in advance only one step is enormous, which is extremely troublesome for the operator who performs the combination. It was. Further, when the combined state of the resin sleeve and the metal sleeve is left for a long time, the metal sleeve inserted by the restoring force of the resin may be pushed back and may be detached from the resin sleeve. Moreover, the combination structure shown in the above publication is a structure that is easily affected by the restoring force and external force of the resin, and in this combination state, it is difficult to maintain the coaxial state of the resin sleeve and the metal sleeve. If the hole is attached to the perforated hole, the sleeve itself is deformed, and as a result, an appropriate anticorrosive effect is not realized.

  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 characterized in that a rigid sleeve is inserted from an opening portion of a sleeve body provided with a resin sleeve having a good sliding characteristic and a large elongation characteristic 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 diameter of 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 is provided with a flange at the upper end portion of the resin sleeve The protrusion formed on the inner peripheral surface of the opening of the collar and the engaging groove formed on the outer peripheral surface of the distal end on the insertion side of the rigid sleeve are brought into a temporarily assembled state. The anti-corrosion sleeve can be attached to the hole.

  According to a second aspect of the present invention, the step of the rigid sleeve inserted into the taper step from the opening is a step with a small diameter portion provided by reducing the diameter of the tip of the resin sleeve. The anti-corrosion sleeve is configured such that when the contact is made, the protrusion of the resin sleeve and the locking groove of the rigid sleeve engage to form a temporary assembly.

  The invention according to claim 3 is the anticorrosion sleeve in which the outer peripheral surface of the rigid sleeve is provided with a groove portion in which the inner periphery of the cylindrical portion of the expanded resin sleeve is press-fitted and adhered.

  The invention according to claim 4 is the anticorrosion sleeve according to any one of claims 1 to 3, wherein the distal end of the rigid sleeve that has been inserted into the resin sleeve is positioned below the distal end of the resin sleeve. .

  In the invention according to claim 5, the claw portion provided at the tip of the resin sleeve so as to be inclined toward the inner diameter side is engaged with the entire circumference or a part of the locking groove provided on the tip outer peripheral surface of the rigid sleeve, This is an anti-corrosion sleeve capable of maintaining this mounting state firmly.

  According to the first aspect of the present invention, it is possible to simplify the process of attaching and setting the rigid sleeve and the resin sleeve separately to the mounting tool, which has been conventionally performed, and the direction and the mounting order of each sleeve are wrong. Therefore, workability can be dramatically improved, and appropriate mounting to the main can be performed. Further, the pushing amount of the rigid sleeve necessary for the temporary assembly is small, and the temporary assembly work is facilitated. In addition, the rigid sleeve and the resin sleeve that have been temporarily assembled are in a state of being aligned, and in addition, the sleeve body in the temporarily assembled state has a structure that does not cause a load. Even in a resin sleeve that is easily received, there is no risk of deformation, and corrosion prevention of the perforated holes is ensured.

  According to the second aspect of the present invention, the rigid sleeve and the resin sleeve that have been temporarily assembled are in an aligned state, and the aligned state is firmly maintained. Even when left for a long period of time, it can be properly attached to the main pipe without causing problems such as the rigid sleeve coming off from the resin sleeve. The effect is demonstrated.

  According to the third aspect of the present invention, when the insertion of the rigid sleeve into the resin sleeve is completed, the inner periphery of the cylindrical portion of the expanded resin sleeve is press-fitted and adhered to the groove provided on the outer peripheral surface of the rigid sleeve. Therefore, this mounting state is maintained more firmly, and there is no possibility that the inserted rigid sleeve is pushed back or detached from the resin sleeve.

  According to the invention of claim 4, since the distal end of the rigid sleeve that has been inserted into the resin sleeve is located below the distal end of the resin sleeve, it is possible to prevent deformation of the distal end portion of the resin sleeve toward the inner diameter side. It becomes. Therefore, the phenomenon that the tip of the resin sleeve protrudes toward the inner diameter side and hinders water flow can be prevented, and an appropriate mounting state of the resin sleeve can be maintained.

  According to the invention according to claim 5, the claw portion provided at the tip portion of the resin sleeve functions as a locking means to the mounting tool before the mounting to the drilling hole, and after the mounting to the drilling hole is completed. In this case, it is possible to engage with the rigid sleeve and firmly maintain the mounted state.

  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. 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 expansion characteristic is easily increased in diameter, This is to make it difficult for cracks to occur. 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 12 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 is a connection portion with the saddle 9 and has a function of preventing a reduction of the water flow diameter due to deformation of the gasket 16.

  FIG. 2 is an enlarged cross-sectional view of a main part in FIG. As shown in the figure, a flange 3a is provided at the upper end portion of the resin sleeve 3, and a projection 3b formed near the upper end of the inner peripheral surface of the flange 3a and the rigid sleeve 4 are provided. A temporary assembly is made by engaging with a locking groove 4a formed on the outer peripheral surface of the distal end of the insertion side, and a structure capable of closely adhering to the cutting surface portion of the hole wall 7a of the drilled hole 7 from this temporarily assembled state; It has become. 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 leading end 4b comes into contact, the projection 3b of the resin sleeve 3 and the locking groove 4a 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. On the outer peripheral surface of the rigid sleeve 4, a cylindrical portion 3f of the resin sleeve 3 whose diameter has been expanded forms a groove portion 4c that is press-fitted and adhered by its restoring force, further strengthening the rigid sleeve 4 and the resin sleeve 3. Function to hold the position. The groove 4c is within the range of the hole wall 7a of the perforated hole 7 of the metal main pipe 6 provided with the mortar lining layer or the resin lining layer 6a so that the inner periphery of the cylindrical portion 3f of the resin sleeve 3 can be surely press-fitted and adhered. It is set to be located.

  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 front end of the sleeve 3 is locked. The second taper 18b sequentially increases the diameter of the resin sleeve 3 from the taper step portion 3c to the front end, thereby inserting and expanding the rigid sleeve 4. It functions so that it can be performed smoothly.

  First, the rigid sleeve 4 is inserted from the opening 5, and the distal end portion 4 b of the rigid sleeve 4 is brought into contact with the tapered step portion 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 4a 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. In addition, the resin sleeve 3 and the rigid sleeve 4 are respectively held around the entire circumference at two locations by the tip portion 4b coming into contact with the taper step portion 3c and the projection portion 3b and the locking groove 4a being engaged. 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. 3 is an explanatory view showing a mounting procedure. As shown in FIG. 3 (a), when the mounting tool 18 is inserted into the 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 smooth insertion of the rigid sleeve 4 that does not cause misalignment or the like, suitable diameter expansion is sequentially performed. As shown in FIG. 3B, 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 d 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, the rigid sleeve 4 (tip portion 4b having a tapered outer peripheral surface) is positioned above the extension line of the second taper 18b of the mounting tool 18, and 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. 3 (b), the diameter of the flange 3 a of the resin sleeve 3 is increased at the same time as the outer periphery of the flange including the O-ring 15 attached to the outer periphery of the resin sleeve 3. The seal sleeve 3 and the water faucet 11 with a saddle are realized with high sealing performance. Further, since the corner portion 17a of the bush portion 17 is pressed against the outer peripheral surface of the flange portion, the seal surface pressure at this portion is maintained in an increased state.

  Next, when the mounting tool 18 is further inserted, as shown in FIG. 3C, the tapered surface portion 3e provided on the lower surface of the flange portion and the hole wall 7a of the perforated hole 7 start to come into close contact with each other. At this time, the entire sleeve tends to be pushed in the insertion direction of the rigid sleeve 4, but movement in the insertion direction is prevented by the flange portion 3a and the tapered surface portion 3e. Since the flange 3a is formed into a thick annular shape, deformation due to excessive pressing is small, and a response upon completion of insertion can be obtained with certainty. It is possible. In addition, when a force in the insertion direction is applied to the resin sleeve 3 due to friction during the insertion of the rigid sleeve 4, the tapered surface portion 3e can be reinforced so as to keep the flange portion 3a in an annular shape. The predetermined sleeve diameter can be secured by inserting the rigid sleeve 4 securing the water diameter without resistance.

  Further, when the resin sleeve 3 is attached to the hole wall 7a, the centering function can be exerted by the tapered surface portion 3e, and the resin sleeve 3 can be accurately inserted into the water passage opening which is the perforated hole 7 for attachment. Since the tapered surface portion 3e is made of resin and has a certain degree of compressibility, it can flexibly cope with tubes of various sizes having different curvatures.

  As shown in FIG. 3D, the total length of the rigid sleeve 4 is set to be longer than that of the resin sleeve 3 in consideration of the elongation of the resin sleeve 3. Accordingly, as shown in the figure, the distal end portion 4b 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, and thereby the distal end of the resin sleeve 3 is inserted. Since the claw portion 3d provided on the sleeve can be surely spread out, 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 resin lining layer) having a small inner diameter, and is shared with the powder lining 6b.

  Finally, the mounting tool 18 is inserted to the state shown in FIG. 3D, the sleeve main body 1 is mounted in the hole 7, and the elastic sleeve 2 is brought into close contact with the cut surface portion of the hole wall 7a. When the insertion is completed, the cylindrical portion 3f of the resin sleeve 3 whose diameter is expanded in the groove portion 4c on the outer peripheral surface of the rigid sleeve 4 is press-fitted and brought into close contact with the restoring force. The sleeve 3 is in a state of being more firmly held in position. Further, the locking groove 4a 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 metal main pipe 6 is completed, and an excellent contact state by the elastic sleeve 2 is realized on the cutting surface portion of the hole wall 7a.

  FIG. 4 is a cross-sectional view showing another example of the anticorrosion sleeve in the present invention. In the figure, 19 is an elastic sleeve, 20 in the figure is a resin sleeve, and 21 in the figure is a rigid sleeve. Similar to the above-described embodiment, the upper end portion of the resin sleeve 20 is provided with a flange portion 20a. The protrusion portion 20b formed on the inner peripheral surface of the opening portion of the flange portion 20a and the distal end on the insertion side of the rigid sleeve 21 are provided. A temporary assembly is formed by engaging with a locking groove 21a formed on the outer peripheral surface, and the elastic sleeve 19 is inserted into the cutting surface portion of the hole wall 7a of the hole 7 by inserting the rigid sleeve 21 from this temporary assembly state. It has a structure that can be adhered. Further, a step with a small diameter portion provided by reducing the diameter of the tip side of the protrusion portion 20b of the resin sleeve 20 is a taper step portion 20c, and the tip portion 21b of the rigid sleeve 21 inserted into the taper step portion 20c from the opening. In addition to functioning so that the protrusion 20b of the resin sleeve 20 and the locking groove 21a of the rigid sleeve 21 engage with each other to form a temporary assembly, the rigid sleeve 21 is aligned, It also has a function to interpolate.

  A claw portion 20d that is inclined toward the inner diameter side is provided at the distal end portion of the resin sleeve 20, and this claw portion 20d is engaged with the engaging groove 21a at the distal end of the rigid sleeve 21 that has been inserted and the entire circumference or part thereof. In addition, since this mounting state is firmly maintained, the rigid sleeve 21 after the insertion is completed does not come out of the resin sleeve 20. Therefore, the locking groove 21a of the rigid sleeve 21 prevents the rigid sleeve 21 from inadvertently coming out of the resin sleeve 20 in the temporarily assembled state and the state where the insertion into the resin sleeve 20 is completed, and is extremely excellent. The attachment work can be performed, and the anticorrosion effect of the perforated holes 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 excellent anti-corrosion sleeve that can reliably prevent corrosion of the exposed metal.

It is sectional drawing which showed the state which mounts the anti-corrosion sleeve in this invention to a water stopper and a metal main pipe. It is a principal part expanded sectional view in FIG. It is 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 sectional drawing which showed the other example of the anti-corrosion sleeve in this invention.

Explanation of symbols

1 Anticorrosion sleeve (sleeve body)
2 elastic sleeve 3 resin sleeve 3a collar 3b protrusion 3c taper step 3d claw 3f tube 4 rigid sleeve 4a locking groove 4b tip 4c groove 5 opening 7 perforation hole 7a hole wall

Claims (5)

  A rigid sleeve is inserted from the opening of the sleeve body with a resin sleeve with 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 hole for drilling, provided with a flange on the upper end portion of the resin sleeve, and a protrusion formed on the inner peripheral surface of the flange; An anticorrosion characterized by engaging a locking groove formed on the outer peripheral surface of the distal end on the insertion side of the rigid sleeve into a temporarily assembled state, and mounting from the temporarily assembled state to the perforated hole can be performed. sleeve.   When the step with the small diameter part provided by reducing the diameter of the tip side of the protrusion of the resin sleeve is a tapered step, the tip of the rigid sleeve inserted from the opening is brought into contact with the taper step. The anticorrosion sleeve according to claim 1, wherein a temporary assembly is formed by engagement of the protrusions of the sleeve and the locking groove of the rigid sleeve.   The anticorrosion sleeve according to claim 1 or 2, wherein a groove portion in which an inner periphery of the cylindrical portion of the expanded resin sleeve is press-fitted and closely attached is provided on an outer peripheral surface of the rigid sleeve.   4. The anticorrosion sleeve according to claim 1, wherein the end of the rigid sleeve that has been inserted into the resin sleeve is positioned below the end of the resin sleeve. The claw portion provided at the tip of the resin sleeve inclines toward the inner diameter side is engaged with the entire circumference or part of the locking groove provided on the outer peripheral surface of the tip of the rigid sleeve, and this mounting state is firmly maintained. The anticorrosion sleeve according to claim 4, which is obtained.

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