JP5485948B2 - Fixing ring diameter expansion tool - Google Patents

Description

  The present invention relates to a tool for expanding the diameter of a fixing ring used when fixing an anticorrosion seal to a cut end surface of a metal tube during the fixing operation.

  When pipes such as waterworks are laid, metal pipes such as cast iron are generally used. However, since metal pipes are generally inferior in corrosion resistance, corrosion resistance is improved by applying anticorrosion coating on the outer surface.

By the way, at the site where pipes are laid, metal pipes are sometimes cut (cut pipes) in the middle to adjust the length, so even if anti-corrosion coating is applied, the metal itself is exposed at the cut end faces. End up.
Therefore, it is necessary to perform anticorrosion repair on the cut end face, and as shown in FIG. 4, the cut end face of the metal tube 21 is covered with a rubber anticorrosive seal 22 having an annular shape in plan view and a U-shaped cross section. It is common.

When fixing such an anticorrosion seal 22 to the metal tube 21, as shown in the figure, a fixing ring 23 capable of expanding the diameter is used.
When the fixing ring 23 is applied to the inner periphery of the anticorrosion seal 22 and the diameter is increased using a dedicated tool, the fixing ring 23 presses the anticorrosion seal 22 against the inner surface of the metal tube 21, thereby completing the fixing operation.

Specifically, as shown in FIG. 5, the fixing ring 23 has a band body in which a T-shaped insertion piece 23 a is provided at one end and a long insertion hole 23 b is provided at the other end. It is produced by bending in an annular shape so as to overlap, and inserting and inserting the insertion piece 23a into the insertion hole 23b.
Since the insertion hole 23b extends in the circumferential direction of the fixing ring 23, when the insertion piece 23a slides along the insertion hole 23b, the peripheral length of the fixing ring 23 changes. As a result, the fixing ring 23 can be expanded and contracted.

A stopper hole 23e is provided inside the insertion piece 23a at one end of the fixing ring 23, and a stopper piece 23d is provided outside the insertion hole 23b at the other end. If the stopper piece 23d is folded (bent) through the stopper hole 23e in a state where the diameter of the fixing ring 23 is expanded, the diameter reduction is prevented.
Further, engaging holes 23c, which are circular holes, are provided in the vicinity of the insertion hole 23b and the insertion piece 23a, respectively.

By the way, as for the diameter expansion tool of the conventional fixing ring, what is called a vise type is mainstream like patent document 1 and 2, and it was not able to be fixed to the cutting end surface of a metal pipe.
For this reason, the diameter expansion tool tends to shift during work, and the diameter expansion force of the diameter expansion tool does not normally act on the fixed ring, and the fixed ring may be buckled or deformed. It was.

  In addition, since the diameter expansion tool cannot be fixed to the cut end surface of the metal tube, when performing the work of bending the stopper piece of the fixing ring, the bending work must be performed with the remaining one hand while holding the diameter expansion tool with one hand. There was also a problem with poor workability.

JP 2002-28875 A JP 2003-291075 A

  Therefore, a problem to be solved by the present invention is to enable a tool for expanding the diameter of the fixing ring to be fixed to the cut end surface of the metal tube with a simple structure.

In order to solve the above-mentioned problems, the diameter increasing tool of the fixing ring of the present invention is configured as follows.
The fixing ring diameter increasing tool has a pedestal that can be arranged in a state where one end of the metal tube straddles the cut end surface and the other end faces the inner peripheral surface of the metal tube and the other end faces the outer peripheral surface of the metal tube. Prepare.
In addition, a pair of arms connected to a portion of the pedestal facing the inner peripheral surface of the metal tube and swingable in a direction in which the tips approach and separate from each other along the circumferential direction of the metal tube are provided.
Furthermore, an engagement protrusion is provided that is coupled to the tip of each arm and is engageable with the fixing ring.
Then, the portion of the pedestal facing the outer peripheral surface of the metal tube is penetrated in the radial direction of the metal tube, and the tip is brought into contact with the outer peripheral surface of the metal tube, whereby the pedestal is placed on the cut end surface of the metal tube. And a screw shaft capable of screw-feeding the pedestal in the radial direction of the metal tube by rotation thereof.

With the diameter-expanding tool fixed on the cut end surface of the metal tube and the engagement protrusions engaged with the fixing ring, the screw shaft is rotated so that the pedestal is directed radially outward of the metal tube. Screw to.
Then, the tips of the arms are pressed against the inner peripheral surface of the metal tube via the engaging projections, so that the arms swing in directions away from each other, and the fixing rings are separated by the separation of both engaging projections. Will be expanded.

  Since the diameter expansion tool can be fixed on the cut end face of the metal tube with a screw shaft, the diameter expansion tool does not move when the diameter of the fixing ring is expanded, preventing buckling deformation of the fixing ring. Can do.

  Since the work of bending the stopper piece of the fixing ring can be performed with both hands while the diameter expansion tool is fixed, workability is improved.

(A) of the diameter expansion tool is a perspective view seen from the front, (b) is a partially broken perspective view seen from the back Exploded perspective view of diameter expansion tool The state where the diameter expansion tool is fixed on the cut end surface of the metal tube is shown, (a) is a side view, (b) and (c) are front views. Shows fixing of anticorrosion seal to metal tube, (a) is a sectional view, (b) is a perspective view Perspective view showing before and after assembly of fixing ring

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The diameter expansion tool 10 for the anticorrosion seal fixing ring of the first embodiment shown in FIG. 1 expands the diameter of the fixing ring 23 used when fixing the anticorrosion seal 22 to the cut end surface of the metal tube 21 during the fixing operation. Used to make

  As shown in FIGS. 1 to 3, the diameter expansion tool 10 of the embodiment includes a pedestal 11, a pair of arms 12, a pair of engagement protrusions 13, a guide 14, and a screw shaft 15.

As shown in the figure, the pedestal 11 includes a prismatic inner rod 11a and an outer rod 11b that are parallel to each other, and a prismatic connecting rod 11c that connects opposite ends of the inner and outer rods 11a and 11b. The appearance is U-shaped.
The inner rod 11a is formed with a shaft hole 11d penetrating in the axial direction of the prism, and the outer rod 11b is formed with a screw hole 11e penetrating between the opposing side surfaces of the prism in parallel with the connecting rod 11c. Yes.
As shown in FIG. 3, the dimensions of the base 11 such as the length of the connecting rod 11c are such that the inner rod 11a faces the inner peripheral surface of the metal tube 21 across the cut end surface of the metal tube 21, and the outer rod 11b is a metal tube. It is a dimension which can be arrange | positioned in the state facing 21 outer peripheral surface.

A pair of arms 12 is connected to the tip of the inner rod 11a of the pedestal 11 (the end face of the prism) via a rotating shaft 12a inserted into the shaft hole 11d.
Both arms 12 are made of an oval plate, and a round hole 12b is formed at the tip (lower end in the figure).
Both arms 12 are swingable about the rotating shaft 12a in the direction in which the tips formed with the round holes 12b approach and separate from each other. The swinging direction is such that the pedestal 11 is disposed across the cut end surface of the metal tube 21 as shown in FIG. 3 (a) and the circumference of the metal tube 21 as shown in FIGS. 3 (b) and 3 (c). The direction is substantially along the direction.

An engaging projection 13 is connected to the tips of both arms 12 via a bracket 13a.
The bracket 13a is bent in an L shape in a side view, the surface substantially parallel to the connecting rod 11c of the pedestal 11 faces the arm 12, and the surface substantially parallel to the inner and outer rods 11a and 11b of the pedestal 11 is A bolt as the engaging protrusion 13 is fixed. The bolt as the engaging protrusion 13 is substantially parallel to the connecting rod 11 c of the base 11. Such bolts can be exchanged for ones of various diameters and lengths. Further, the engaging protrusion 13 may be a pin or the like instead of the bolt.
In addition, a stopper 13b is attached by appropriate means such as welding in the vicinity of the bent portion of the surface parallel to the connecting rod 11c of the base 11 of the bracket 13a. As shown in the figure, the stopper 13b made of a rectangular plate is substantially parallel to the connecting rod 11c of the base 11 and hangs down (hangs out) from the bent portion of the bracket 13a.
Furthermore, the square hole 13c is formed in the bracket 13a in the location which corresponds with the round hole 12b of the arm 12. FIG.

Further, a guide 14 is bridged between the tips of both arms 12. The guide 14 is made of a rectangular plate, and is formed with a rectangular long hole 14a arranged in parallel in the longitudinal direction.
Both arms 12, both engaging projections 13 (brackets 13a) and guides 14 have round pins 14b from the front side and square pins 14c from the back side in a state where the round holes 12b, square holes 13c and long holes 14a match. They are connected by being inserted.

The entire round pin 14b is a cylindrical portion, and only the head is a prismatic portion. On the other hand, almost the entire square pin 14c is a prism. The round pins 14b and the square pins 14c are integrally coupled by appropriate means such as screw coupling, and constitute both ends of a square column portion and a center portion of a cylindrical portion pin.
In a state where both arms 12, both engaging projections 13 (bracket 13 a) and guide 14 are connected, the cylindrical portion of the round pin 14 b is fitted into the round hole 12 b of both arms 12, and the rectangular column portion is a long hole of the guide 14. 14a, and the square column part of the square pin 14c is fitted into the square hole 13c of the bracket 13a.
As a result, both arms 12 can rotate with respect to the engaging protrusion 13 and the guide 14, but the engaging protrusion 13 is prevented from rotating with respect to the guide 14.
Therefore, when both the arms 12 swing, the engaging protrusion 13 slides along the long hole 14a of the guide 14 with its direction (axial direction) being fixed. That is, the guide 14, the round pin 14b, and the square pin 14c function as a mechanism that holds (fixes) the axial direction of the engagement protrusion 13 when the arm 12 swings.

On the other hand, the screw shaft 15 is screwed into the screw hole 11 e of the outer rod 11 b of the base 11. A handle 15a is provided at the rear end (lower end in the figure) of the screw shaft 15, and a relatively soft protective plate 15b made of synthetic resin or the like is provided at the front end (upper end in the figure).
If the handle 15a is gripped and the screw shaft 15 is rotated with the pedestal 11 being prevented from rotating, the pedestal 11 is screw-fed so that the relative position with the screw shaft 15 changes.

  The configuration of the diameter expansion tool 10 of the embodiment is as described above. Now, as shown in FIG. 3, the cut end surface of the metal tube 21 is covered with the anticorrosion seal 22, and the fixing ring 23 is applied to the inner surface of the anticorrosion seal 22. The pedestal 11 is disposed across the cut end face. At this time, the position is adjusted so that the engagement protrusion 13 faces the engagement hole 23c of the fixing ring 23.

When the screw shaft 15 is rotated in a state where the protective plate 15b is in contact with the outer surface of the metal tube 21, and the pedestal 11 is screwed in a direction descending in FIG. 3 (radially outward of the metal tube 21), the pedestal 11 At the same time, the engaging protrusion 13 descending enters the engaging hole 23c of the fixing ring 23 and engages therewith.
In this way, as shown in FIGS. 3A and 3B, the diameter expanding tool 10 sandwiches the metal tube 21 from the inner peripheral surface and the outer peripheral surface by the protection plate 15b of the screw shaft 15 and the engaging protrusion 13, and simultaneously metal The tube 21 is fixed to the cut end surface.

When the screw shaft 15 is further rotated from this state, the pedestal 11 is further lowered, and both the arms 12 are pressed against the inner peripheral surface of the metal tube 21 through the engaging projections 13 that are lowered along with this. With this pressing force, both arms 12 swing in directions in which the tips are separated from each other as shown in FIGS.
At the same time, the engagement protrusions 13 are separated from each other, and as shown by the arrow in FIG. 3C, the fixing ring 23 is loaded with a force in a direction to be expanded through the engagement holes 23c. The diameter will be expanded. Due to the diameter increase of the fixing ring 23, the anticorrosion seal 22 is pressed against the inner peripheral surface of the metal tube 21, and the fixing operation is completed.

When the expansion of the fixing ring 23 is completed, the stopper piece 23d is bent to prevent the diameter reduction. At this time, since the diameter expansion tool 10 is fixed to the metal tube 21, both hands are used. Bending work can be performed and workability is good.
Similarly, since the diameter expansion tool 10 is fixed to the metal tube 21 during the diameter expansion operation, it does not move and an abnormal force does not act on the fixing ring 23, so that buckling deformation and the like are prevented. Yes.
The diameter expansion tool 10 is generally box-shaped, has a well-balanced shape, and has a center of gravity at a relatively stable position, and thus has excellent operability.

When the both arms 12 are separated from each other, as described above and as shown in FIGS. 3B to 3C, the both engaging projections 13 are vertically downward (in a direction substantially parallel to the connecting rod 11c of the base 11). Slide in the direction of separation while being fixed to.
Therefore, it is possible to prevent the engagement protrusion 13 from being inclined and coming out of the engagement hole 23c of the fixing ring 23 during the diameter expansion operation, and the diameter expansion force is smoothly transmitted to the fixing ring. .
Since the diameter expansion tool 10 can freely change the interval between the engagement protrusions 13 by screw feeding, it can be applied to the metal pipe 21 having various pipe thicknesses.

Further, when both arms 12 are separated from each other by a certain amount or more, the stopper 13b attached to the bracket 13a comes into contact with the inner peripheral surface of the metal tube 21, so that the pedestal 11 is further lowered and the both arms 12 are separated (both Separation of the engaging protrusion 13 is impossible.
For this reason, damage to the anticorrosion seal 22 due to excessive pressing of the fixing ring 23 is prevented.
For this purpose, the stopper 13b is preferably formed of a relatively soft material such as a synthetic resin so as not to damage the inner peripheral surface of the metal tube 21.

In the above embodiment, the pedestal 11 of the diameter expanding tool 10 has a U-shape when viewed from the side, but the shape of the pedestal 11 is not particularly limited as long as it can be disposed across the cut end surface of the metal tube 21. For example, it may be arcuate when viewed from the side.
Further, in order to reduce the manufacturing cost of the diameter expanding tool 10, the stopper 13b may be omitted, or the mechanism 14 for fixing the direction of the engaging protrusion 13 may be omitted. The mechanism 14 for fixing the direction of the engagement protrusion 13 is not limited to the embodiment.

  It should be considered that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the embodiments described above, and is intended to include any modifications and variations within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Diameter expansion tool 11 Base 11a Inner rod 11b Outer rod 11c Connecting rod 11d Shaft hole 11e Screw hole 12 Arm 12a Rotating shaft 12b Round hole 13 Engagement protrusion 13a Bracket 13b Stopper 13c Square hole 14 Guide 14a Long hole 14b Round pin 14c Square Pin 15 Screw shaft 15a Handle 15b Protection plate 21 Metal tube 22 Anticorrosion seal 23 Fixing ring 23a Insertion piece 23b Insertion hole 23c Engagement hole 23d Stopper piece 23e Stopper hole

Claims (2)

A tool for expanding the diameter of the fixing ring 23 used when fixing the anticorrosion seal 22 to the cut end face of the metal tube 21 during the fixing operation,
A pedestal 11 that can be disposed in a state where one end of the metal tube 21 is opposed to the inner peripheral surface of the metal tube 21 and the other end of the metal tube 21 is opposed to the outer peripheral surface of the metal tube 21 across the cut end surface.
A pair of arms 12 connected to a portion of the pedestal 11 facing the inner peripheral surface of the metal tube 21 and swingable in a direction in which the tips approach and separate from each other along the circumferential direction of the metal tube 21;
An engagement protrusion 13 connected to the tip of each arm 12 and engageable with the fixing ring 23;
A portion of the pedestal 11 facing the outer peripheral surface of the metal tube is penetrated in the radial direction of the metal tube 21, and a tip thereof is brought into contact with the outer peripheral surface of the metal tube 21, so that the pedestal 11 is brought into contact with the outer periphery of the metal tube 21. A screw shaft 15 that can be fixed on the cut end surface and that can rotate the base 11 in the radial direction of the metal tube 21 by rotation thereof;
When the base 11 is screwed outward in the radial direction of the metal tube 21 by the rotation of the screw shaft 15 with the engagement protrusions 13 engaged with the fixing rings 23, the tips of the arms 12 are Is pressed against the inner peripheral surface of the metal tube 21 through the engaging projections 13, so that the arms 12 swing in directions away from each other, and the fixing ring 23 is pushed by the separation of the engaging projections 13. Expanding tool for expanding the fixed ring.   The diameter-enlarging tool for a fixing ring according to claim 1, further comprising a mechanism (14) for holding the axial direction of the engaging protrusion (13) when the arms (12) swing.

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