JP2005288553A - Tool for mounting fixed ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely expand the diameter of a fixed ring 10 for a corrosion proof core of a pipe and fix the ring 10. <P>SOLUTION: Both of expansion and contraction members 31a and 31b contact in parallel via a guide shaft 33. An auxiliary member 37 can be fixed at an arbitrary position of the shaft 33 by a thumb screw 39. An engagement element 34 is fitted into a hole 16 for a tool of the fixed ring 10 in a state of approaching direction force applied to both the expansion and contraction members 31a and 31b by a spring 38. By rotating an adjusting shaft 32 by an electric drill with a torque limiter from this state to separate both the expansion and contraction members 31a and 31b and the fixed ring 10 is expanded in diameter (prescribed expansion diameter force works on the fixed ring 10) according to the separation. At this time, even if the fixed ring 10 is made into an excessively expanded diameter state by excessively rotating the adjusting shaft 32, expansion and contraction force due to the excessive rotation is absorbed by elongation and contraction of the spring 38. As a result, the fixed ring 10 has no possibility of damage, etc. due to generation of deformation distortion, etc. by expanding and contracting the fixed ring 10 in diameter more than required. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing ring mounting jig used when a ring for fixing a pipe end anticorrosion core or the like attached to a metal pipe insertion opening constituting a pipeline such as water supply is installed.

  Conventionally, for example, when a ductile cast iron pipe is buried in the ground and a pipe line is laid, the entire pipe is subjected to corrosion prevention by painting or lining, and as shown in FIG. In general, the insertion port 2a of the succeeding tube 2 is inserted and joined. At this time, as shown in the figure, in the NS type joint provided with earthquake resistance, the lock ring 3 is provided on the inner surface of the receiving port 1a, and the projection 4 gets over the lock ring 3 as shown by the chain line in the figure. Insert the insertion slot 2a. In the figure, 5 is a packing and 6 is a lining.

  In the laying of this pipe line, there is a case where the pipe 2 is not always connected only by a fixed-size pipe, but the pipe 2 must be cut and joined so as to have a predetermined length at the construction site. When the tube 2 is cut in this way, the coating is peeled off and the background is exposed on the tube end surface that becomes the cut surface, so that the anticorrosion function is impaired and red water or the like is generated. Therefore, in general, the anticorrosion coating is applied again to the end face after the cut tube to perform the anticorrosion. However, when anticorrosion paint is applied to the end face after the cut tube and the anticorrosion is applied again, it takes time to dry in cold weather, and it is difficult to apply in places where running water does not stop completely, such as switching work. There is a problem that it is difficult to work.

For this reason, as a method other than applying the anticorrosion paint to the end face after the cut tube, there is a method of sealing the exposed portion using the anticorrosion core 7 as shown in FIGS. Since the anticorrosion core 7 is made of an elastic body such as rubber, the anticorrosion core 7 is retained by its elasticity. However, as a method for more reliably fixing, the anticorrosion core is used by using a fixing ring 10 that is 10% open in the circumferential direction. There is one in which 7 is fixed from the inner surface by an expanding force (see Patent Document 1).
Japanese Patent Laid-Open No. 7-139686

Further, as shown in FIGS. 10 and 11, the fixing ring 10 is divided into one in the circumferential direction, both ends 11 and 13 are overlapped, and the locking piece 15 of the other end 13 is inserted into the one end 11. In some cases, the locking piece 15 is folded back, and the function of preventing the diameter reduction of the fixing ring 10 is provided by the folding back (see Patent Document 2).
JP 2002-286195 A

  First, the fixing ring 10 is formed into a circular shape as shown in FIG. 11 (a), and then, as shown in FIG. A piece 15 is inserted so that the outer diameter of the ring 10 is smaller than the inner diameter of the core 7, and the fixing ring 10 is placed in the annular groove 9 on the inner surface of the core 7, as shown by the chain line in FIG. 10 is expanded (see FIG. 11 (b)), and the locking piece 15 that is viewed from the hole 12 is bent as shown in FIGS. 10 and 11 (c) to fix the ring 10 so as not to shrink in the circumferential direction.

  Generally, a jig such as a snap ring pliers P or a vise is used to reduce or increase the diameter of the fixing rings 10. These fixing ring mounting jigs (pliers P) may cause the pair of grips 21 and 22 to be strongly clamped and cause the fixing ring 10 to expand or contract more than necessary to be damaged.

Therefore, as shown in FIG. 11 (b) and FIG. 12, the applicant of the present application rotatably connects one end of the pair of grip handles 21, 22 and grip pieces 24, 25 from one end of both grip handles. Each of the grip handles 21 and 22 is extended between the other ends of the grip handles 21 and 22, and one end 46 of the load adjustment rod 45 is locked to the other end of the grip handle 21. A load adjusting mechanism 50 comprising a spring 51 or the like is provided at the other end of the grip handle 22, and the front end engaging elements 26 of the grip pieces 24, 25 are split into one and locked to both ends of the fixing ring 10, respectively. A jig P was proposed in which the grip ring 24, 25 is expanded or narrowed by grasping the other ends of the handles 21, 22, and the fixing ring 10 is attached in a tensioned state with a reduced or expanded diameter. (See Patent Document 3).
JP 2002-28875 A

In the fixing ring mounting jig P described in Patent Document 3, after the diameter of the fixing ring 10 is increased (after tightening), it is necessary to tighten the tightening nut 52 in order to maintain the gap between the grip pieces 24 and 25. is there.
For this reason, during the tightening, the jig P is held with one hand and the tightening nut 52 is tightened with the other hand. If the jig P moves during the tightening, both ends of the fixing ring 10 are fixed. There is a possibility that the engaging element 26 inserted into the enlarged diameter hole 16 may come off. In particular, in the fixing ring 10 to the pipe having a small nominal diameter, the jig P is detached even if the jig P is slightly moved.

  In view of the above points, an object of the present invention is to make it possible to reliably and promptly perform the expansion / contraction diameter and fixing of the fixing ring 10 with a jig having a configuration other than a snap ring pliers and a vise.

In order to achieve the above object, the present invention enables a parallel member having an engagement element to a fixing ring at the tip to be contacted and separated by a screw shaft, and both members are contacted and separated by turning the screw shaft. The diameter of the fixing ring is reduced or increased through the joint.
In the case of a screw shaft, both members cannot be contacted or separated unless the shaft is rotated. For this reason, both members do not move, and there is no fear that the engaging elements engaged with both ends of the fixing ring will come off.

  As described above, according to the present invention, the fixing ring is expanded and contracted by the screwing of the screw connection, so that the expansion / contraction state is stabilized, and the expansion / contraction diameter and fixing of the fixing ring can be performed reliably and promptly.

BEST MODE FOR CARRYING OUT THE INVENTION

As an embodiment of the present invention, it comprises a pair of parallel expansion / contraction members, an adjustment shaft and a guide shaft provided perpendicular to one of the expansion / contraction members, and an engagement element at the tip of both expansion / contraction members, One expansion / contraction member is integrally fixed, and the other expansion / contraction member is slidably penetrated.By the guide shaft, the other expansion / contraction member can be contacted / separated in parallel with the one expansion / contraction member, The adjustment shaft is provided integrally with the one expansion / contraction member so as to be rotatable around the axis thereof, and is screwed through the other expansion / contraction member and rotates the adjustment shaft around the axis, thereby The other expansion / contraction member is adapted to come into contact / separate with respect to the expansion / contraction member, and the engaging elements are respectively engaged with both ends of the split fixing ring, and the other expansion / contraction member with respect to the one expansion / contraction member. By contact and separation, condensation diameter or the fixing ring may adopt a configuration for mounting in tension while being enlarged.

In this configuration, two guide shafts are provided, and an auxiliary member is provided on the outer side of the other expansion / contraction member in parallel with the expansion / contraction member. The auxiliary member includes the two guide shafts penetrating the other expansion / contraction member. A spring that slidably penetrates and is provided between the auxiliary member and the other expansion / contraction member to be biased in a direction to separate them, and can be fixed to the auxiliary member at an arbitrary position in the axial direction of the guide shaft It can be set as the structure which provided.

Thus, if the expansion / contraction member is guided by the two guide shafts, the contact / separation while maintaining the parallel state of the expansion / contraction member can be stably performed. The guide shaft is not limited to two and may be three or more.
Further, the other expansion / contraction member receives the reaction force from the fixing ring and receives torsion with the engagement member as a fulcrum during the movement for expanding / contracting the fixing ring, but between the auxiliary member and the other expansion / contraction member. The two expansion / contraction members maintain a parallel state and move smoothly so that the two springs provided on the plate act so as to cancel the reaction force (so that their own spring force is the same) and prevent the twisting thereof. .

  Further, if the adjusting shaft is slidably penetrated through one of the expansion / contraction members and the protrusion is bulged so that it cannot be pulled out, the adjustment shaft is slidably penetrated through the one expansion / contraction member. Therefore, even if the adjustment shaft is turned too much and the fixing ring is excessively expanded / contracted, the spring expands / contracts and the adjustment shaft slides on one expansion / contraction member so that the distance between the expansion / contraction members is maintained almost constant. It absorbs the expansion / contraction force caused by the excessive rotation. For this reason, there is no fear that the fixing ring is expanded or contracted more than necessary, causing deformation or the like to be damaged.

The bulging part of the adjustment shaft may be formed as long as the adjustment shaft can be prevented from coming off by screwing a washer or the like to the end surface of the adjustment shaft. It is good to provide. This is because the thrust shaft can smoothly rotate the adjustment shaft.

  An embodiment is shown in FIG. 1 to FIG. 5, and this embodiment includes a pair of parallel expansion / contraction members 31a and 31b, an adjustment shaft 32 provided perpendicular to one of the expansion / contraction members 31a, and two guide shafts 33, 33 and an engagement element 34 at the tip of the expansion / contraction members 31a and 31b. The engaging element 34 is configured by screwing a bolt, and the material thereof is arbitrary as long as it does not hinder use, and is, for example, SCM.

The guide shaft 33 is integrally fixed to one expansion / contraction member 31a by welding and slidably penetrates the other expansion / contraction member 31b. The guide shaft 33, 33 allows the other expansion / contraction member 31a to be in contact with the other expansion / contraction member 31a. The expansion / contraction member 31b can be contacted and separated in a parallel state. Instead of welding, known means such as screwing can be employed.

The adjustment shaft 32 is formed of a screw shaft and is threaded through the other expansion / contraction member 31b. The expansion / contraction member 31a passes through the rotation member 31a so as to be rotatable, and a thrust bearing 35 is fixed to the protruding portion by a screw 36. This thrust bearing 35 is fixed to one expansion / contraction member 31a. For this reason, the adjustment shaft 32 is fixed to one expansion / contraction member 31a via a thrust bearing 35 so as to be rotatable about the axis thereof. By rotating the adjustment shaft 32 about the axis, the other expansion / contraction member 31a is fixed to the other expansion / contraction member 31a. The expansion / contraction member 31b contacts and separates.

An auxiliary member 37 is slidably passed through the adjustment shaft 32 and the guide shaft 33 outside the other expansion / contraction member 31b in parallel with the expansion / contraction member 31b, and the guide shaft between the auxiliary member 37 and the other expansion / contraction member 31b. A spring (extension spring) 38 that biases the two members 37 and 31b away from each other is provided around 33.

A butterfly screw (bolt) 39 is screwed into the end of the auxiliary member 37, and its tip can be pressed against one guide shaft 33. Therefore, by moving the auxiliary member 37 to an arbitrary position in the axial direction of the guide shaft 33 and screwing the thumbscrew 39, the auxiliary member 37 is fixed at that position.
A grip 40 is screwed to one expansion / contraction member 31 a, and the jig A is carried by the grip 40 and is set at a predetermined position, that is, a position where the engagement element 34 is fitted into the expansion / contraction hole 16 of the fixing ring 10. .

  This embodiment is configured as described above, and the case where the fixing ring 10 shown in FIGS. 9 to 11 is attached by the jig A will be described. The jig A is in a state where the auxiliary member 37 is fixed at an appropriate position. First, the fixing ring 10 is fitted in the groove 9 of the anticorrosion core 7 in the state shown in FIG. 11 (b), and then the engagement element of the jig A as shown in the solid line and the solid line in FIG. 34 is fitted into the jig hole 16.

In a state where the engagement element 34 is fitted in the jig hole 16, a force in the approaching direction is normally applied to both the expansion / contraction members 31 a and 31 b by the spring 38, and the diameter of the fixed ring 10 is reduced via the engagement element 34. Directional force acts. If the force is too strong to cause trouble, the thumbscrew 39 is loosened, and the auxiliary member 37 is moved on the guide shaft 33 and the adjustment shaft 32 so as to have a required spring force, and again the thumbscrew. The auxiliary member 37 is fixed to the guide shaft 33 by screwing 39.

On the other hand, when the engaging element 34 is fitted into the jig hole 16, if the thumbscrew 39 is loosened in advance and the auxiliary member 37 can be moved to the guide shaft 33, the expansion / contraction members 31a and 31b by the spring 38 can be moved closer to each other. The force does not act, and the force in the diameter reducing direction of the fixing ring 10 via the engaging element 34 does not act. For this reason, the trouble by the strength is too strong does not arise. In this case, after fitting the engagement element 34, the auxiliary member 37 is moved and fixed at a position where a required spring force (biasing force) is applied.
The movement and fixation of the auxiliary member 37 can cope with a change in the diameter of the fixing ring 10 (change in the inner diameter of the tube 2).

Next, from this state, when the adjustment shaft 32 is turned as shown by the arrows in FIGS. 4 and 5, the other expansion / contraction member 31b is gradually separated from the one expansion / contraction member 31a, as shown by the arrow in FIG. Accordingly, the diameter of the fixing ring 10 is expanded (a predetermined diameter expansion force acts on the fixing ring 10).

At this time, if the adjusting shaft 32 is turned too much and the fixing ring 10 is excessively expanded in diameter, the contraction reaction force of the spring 38 is increased to notify the excessive turning. For this reason, there is little possibility that the diameter of the fixing ring 10 is increased more than necessary to cause a deformation distortion and the like to be damaged.
When the other expansion / contraction member 31b is moved, the engagement member 34 at the tip is fitted in the jig hole 16 to receive a reaction force from the fixing ring 10 and receives torsion with the engagement member 34 as a fulcrum. The other expansion / contraction members 31b move smoothly while maintaining the parallel state in order to prevent the twisting of the members 38 and 38 by canceling the reaction force.

  The screwing of the adjustment shaft 32 may be performed manually with a spanner or the like, but excessive diameter expansion can be prevented by performing with an electric tool (driver) with a torque limiter. Even manually, a spanner with a torque limiter can be used. The operating torque of the torque limiter is set to a value at which a large contraction reaction force of the spring 38 is generated, for example, when the diameter of the fixing ring 10 is appropriately increased and more torque is applied. If the torque limiter accurately determines when the fixing ring 10 has an appropriate diameter expansion (if it operates when the fixing ring 10 has an appropriate diameter expansion), the auxiliary member 37, the thumbscrew 39, and The spring 38 can be omitted.

  If the predetermined diameter of the fixing ring 10 can be increased, the locking piece 15 is bent as shown in FIGS. 11C and 10 to fix the fixing ring 10 so as not to shrink in the circumferential direction. When the attachment of the fixing ring 10 is completed, the adjustment shaft 32 is reversely rotated to release the separation force of the other expansion / contraction member 31b with respect to one expansion / contraction member 31a, and the engagement element 34 is fitted into the jig hole 16. When loosened, the jig A is removed from the fixing ring 10.

  In the above embodiment, the adjusting shaft 32 is fixed to one of the expansion / contraction members 31a via the thrust bearing 35. However, the adjustment shaft 32 is slidably passed through the one expansion / contraction member 31a, and Due to the bulging of the thrust bearing 35, the expansion / contraction member 31a cannot be pulled out and can be rotated around its axis. In this case, due to the urging force of the spring 38, the thrust shaft 35 of the adjusting shaft 32 comes into contact with the one expansion / contraction member 31a and is always integrated.

With this configuration, when the adjustment shaft 32 is turned too much and the fixing ring 10 is excessively expanded in diameter, the spring 38 contracts and the adjustment shaft 32 protrudes from one expansion / contraction member 31a (thrust bearing). 35 is separated from one expansion / contraction member 31a), the distance between the expansion / contraction members 31a, 31b is substantially maintained, and the expansion / contraction force due to the excessive rotation is absorbed. Since this action can be performed within the elastic region of the spring 38, the number of turns (torque limit) is set to be within the elastic region of the spring 38.

  In these embodiments, when the size of the fixing ring 10 for expanding the diameter is the same and the degree of diameter expansion (the interval between the two expansion / contraction members 31a and 31b) is constant (in the case of the pipe 2 having the same nominal diameter). Since the appropriate distance between the expansion / contraction members 31a and 31b when the engaging element 34 of the jig A is fitted in the jig hole 16 is constant, the auxiliary member 37 may be always fixed to the guide shaft 33 (movable). Not necessarily).

  As shown in FIG. 6, the structure of the engagement element 34 may be such that bolts are inserted through the expansion / contraction members 31a and 31b and the nuts 34a are prevented from coming off. Further, as shown in FIG. 7, if chamfering a is performed on the outer edges of the expansion / contraction members 31a, 31b (the opposite edge of the opposite edges of the expansion / contraction members 31a, 31b), the inner diameter of the anticorrosion core 7 (the inner diameter of the pipe) ) Is small, it becomes difficult to interfere with the fixing ring 10 due to the chamfered lack.

In addition, the guide shaft 33 may be one if the parallel movement of both the expansion / contraction members 31a and 31b is ensured. In this case, the guide shaft 33 and the adjustment shaft 32 prevent the other expansion / contraction member 31b from rotating relative to the one expansion / contraction member 31a when the adjustment shaft 32 rotates.
Further, since the other expansion / contraction member 31b can move in parallel with the one expansion / contraction member 31a by the rotation of the adjustment shaft 32, they can be omitted if the effect of the auxiliary member 37 and the spring 38 is not desired.
Further, the adjustment shaft 32 does not necessarily have to pass through the auxiliary member 37. In this case, since the adjustment shaft 32 does not reach the auxiliary member 37, it is rotated between the auxiliary member 37 and the other expansion / contraction member 31b.

Although the embodiment was the case of diameter expansion, the fixing ring mounting jig A of the present invention can of course be adopted even in the case of diameter reduction, and can be applied to the fixing ring 10 of the anticorrosion ring 7. Needless to say, the present invention can be applied to all fixing rings that are fixed by expanding and contracting the diameter.

Perspective view of one embodiment Partial cutaway plan view of the same embodiment Front view of the same embodiment Operational diagram of this embodiment Operational diagram of this embodiment Front view of a partially cutaway attachment portion of another embodiment The bottom view of the attachment part of the engagement element of another Example Cross section of the main part of the pipe joint Expanded cross-sectional view of the main part of the pipe insertion opening Illustration of mounting action of fixing ring Illustration of mounting action of fixing ring Front view of conventional example

Explanation of symbols

1, 2 Tube 1a Receptacle 2a Insert 7 Corrosion-proof core 10 Corrosion-proof core fixing rings 31a, 31b Expansion / contraction member 32 Adjustment shaft 33 Guide shaft 34 Engagement element 35 Thrust bearing 37 Auxiliary member 38 Spring 39 Thumb screw A Fixing ring mounting jig

Claims (4)

It comprises a pair of parallel expansion / contraction members 31a, 31b, an adjustment shaft 32 and a guide shaft 33 provided perpendicularly to one of the expansion / contraction members 31a, and an engagement element 34 at the tip of the expansion / contraction members 31a, 31b.
The guide shaft 33 is integrally fixed to one expansion / contraction member 31a and slidably penetrates through the other expansion / contraction member 31b. The guide shaft 33 allows the other expansion / contraction member 31b to be parallel to the one expansion / contraction member 31a. It has become free to contact in the state,
The adjustment shaft 32 is provided integrally with the one expansion / contraction member 31a so as to be rotatable about its axis, and is screwed through the other expansion / contraction member 31b to rotate the adjustment shaft 32 about its axis. Thus, the other expansion / contraction member 31b comes in contact with and separates from the one expansion / contraction member 31a,
The engaging elements 34 are respectively engaged with both ends of the split fixing ring 10, and when the other expansion / contraction member 31 b comes in contact with or separates from the one expansion / contraction member 31 a, the fixing ring 10 is contracted or expanded. Fixing ring mounting jig to be mounted in a tensioned state.   The two guide shafts 33 are provided, and an auxiliary member 37 is provided outside the other expansion / contraction member 31b in parallel with the expansion / contraction member 31b. The auxiliary member 37 penetrates the other expansion / contraction member 31b. The shaft 33 is slidably penetrated, and a spring 38 is provided between the auxiliary member 37 and the other expansion / contraction member 31b to urge the members 37 and 31b away from each other. 2. A fixing ring mounting jig according to claim 1, further comprising means 39 that can be fixed at an arbitrary position in the axial direction.   The adjusting shaft 32 is slidably passed through one expansion / contraction member 31a, and its protrusion is bulged so that it cannot be pulled out. Two guide shafts 33 are provided, and outside the other expansion / contraction member 31b. An auxiliary member 37 is provided in parallel with the expansion / contraction member 31b. The auxiliary member 37 is slidably penetrated by the guide shafts 33 penetrating the other expansion / contraction member 31b, and the auxiliary member 37 and the other expansion / contraction member. A spring 38 is provided between 31b to urge both members 37 and 31b away from each other. By this spring 38, the bulging portion of the adjusting shaft 32 comes into contact with the one expansion / contraction member 31a and is always integrated. The auxiliary member (37) is provided with means (39) that can be fixed at an arbitrary position in the axial direction of the guide shaft (33). Jig constant ring mounting. 4. The fixing ring mounting jig according to claim 3, wherein the bulging portion of the adjusting shaft 32 is formed by providing a thrust bearing 35 on the protruding portion.

Images