JP2006297550A - Jig for mounting fixing ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely and quickly perform expansion/contraction of a diameter of a fixing ring and fixing work of it. <P>SOLUTION: Opposed pair of opening/closing pieces 21, 21 are turnably connected by a rotating shaft 31. A pair of engaging elements 26, 26 fitted into the holes 16, 16 for a jig of a fixing ring 10 are provided on the tip end. The rotating shaft 31 is supported on a frame 41 of a fixed side 51 of a toggle mechanism 40, and the pair of opening/closing pieces 21, 21 are connected to a shaft 42 of a movable side 52 of the toggle mechanism 40 through a link means 30 converting the back and forth motion to a rotary motion. The link means 30 is composed of the rotating shaft 31, and a pair of connecting members 35, 35 rotatably supported on the rear ends 32, 32 of the pair of opening/closing pieces 21, 21, and the shaft 42. Since the shaft 42 always moves forward and backward by a certain distance and the opening/closing pieces 21, 21 is turned by the operation of the toggle mechanism 40, the diameter expansion and mounting of the fixing ring 10 can be easily and rapidly performed. Since the engaging elements 26, 26 always approach or leave by a certain distance, the expansion/contraction torque can be maintained constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to anticorrosion of an insertion port end surface formed by a cut pipe in a joint portion of a metal pipe used for a water pipe or the like.

  Conventionally, a coating for anticorrosion of the cut pipe end face has been applied to the end face of the local cut pipe of the ductile pipe used for water pipes, etc., and then bonded after drying. However, since this paint takes time to dry, the workability is poor, and this method has a problem that it cannot be used when performing a pipe switching work without stopping the running water of the pipe. Moreover, there is also a problem that the anticorrosion performance is inferior to that of a factory-painted product because it is difficult for the paint to be placed on the edge portion of the cut tube end face.

  Then, the technique of attaching an anticorrosion core to a cut tube end surface is disclosed as a mechanical anticorrosion method. For example, the anticorrosion structure of the insertion port end face shown in Patent Document 1 or Patent Document 2 will be described based on FIG. 5, which is an explanatory view of the embodiment of the present invention. The anticorrosion core 3 is fitted, and the anticorrosion core fixing ring 10 made of stainless steel is applied to the inner peripheral surface of the anticorrosion core 3, and the fixing ring 10 is expanded in diameter by a dedicated jig. The anticorrosion core 3 is inserted and fixed to the mouth 2.

When expanding the diameter of the fixing ring, a fixing ring mounting jig is used.
For example, in the mounting jig described in Patent Document 3, a pair of engagement elements at the front end of the opening / closing piece of the jig is fitted into the engagement hole of the pair of fixing rings addressed to the inner peripheral surface of the anticorrosion core of the insertion opening. Each. A butterfly nut is attached to one end of the bolt shaft that connects between the two rear ends of the grip of the jig via a contact plate and a spring. By tightening the butternut, the spring contracts and the distance between the rear ends of the grip is reduced. On the other hand, the pair of engaging elements at the tip of the jig is expanded.
When the pair of engagement elements is pushed and expanded, the fixing ring is expanded in diameter and pressed against the inner peripheral surface of the anticorrosion core, and thereafter the diameter reduction preventing material facing the diameter reduction preventing hole is bent to maintain the diameter expanded state. Then remove the jig.

  Furthermore, the mounting jig described in Patent Document 4 urges the rear ends of the grips of the jig described in Patent Document 3 to always approach each other and pushes the pair of engaging elements to work. Is an improvement.

JP 2002-71085 A JP 2002-276887 A JP 2002-28875 A JP 2003-291075 A

  However, the fixing ring mounting jigs described in Patent Document 3 and Patent Document 4 involve an operation of tightening the butterfly nut to a predetermined position when the diameter is expanded (or contracted). At this time, during the tightening work, you must hold the jig with one hand and tighten the tightening nut with the other hand, but it is necessary to hold the jig firmly so that it does not move during the tightening. Furthermore, a jig capable of expanding and reducing the fixing ring and fixing the fixing ring more reliably and quickly is desired.

  In view of this, an object of the present invention is to make sure that the fixing ring can be expanded and contracted and fixed reliably and promptly.

  In order to solve the above-described problems, the present invention connects a pair of opening and closing pieces to the movable side of the toggle mechanism via link means for converting the forward and backward movement of the movable side into a rotational movement. The engaging elements at the tips of both the opening and closing pieces can be brought into and out of contact with each other by a rotating motion.

The toggle mechanism connects the fixed side (frame) and the movable side (shaft) with a link, and moves the movable side a fixed length with respect to the fixed side by operating the link. The toggle mechanism can move back and forth, and the toggle mechanism reverses the direction of the reaction force acting on the link when the handle operation passes a certain point (dead point) (an explanatory diagram of an embodiment of the present invention). 2 (see arrows F and F ′ shown in FIG. 2), the movable side advance / retreat position can be self-locked to the fixed side after the handle exceeds that point.
For this reason, the engaging element of the opening and closing piece that opens and closes by moving back and forth on the movable side is always contacted and separated at a constant distance, and the contact and separation distance is defined as the diameter expansion width of the fixing ring (the amount of expansion of the distance between the diameter expansion holes). Alternatively, if it is set to a reduced diameter width, the fixing ring always has a predetermined enlarged / reduced diameter width, and the position after the enlarged / reduced diameter can be maintained.
Therefore, the work can be performed quickly with a single touch, and torque management is also easy.

  Since the present invention is configured as described above, the expansion / contraction diameter and the fixing of the fixing ring can be surely and rapidly performed.

  As an embodiment of the above means, a pair of opposing opening and closing pieces are pivotally connected, and a pair of jig holes for diameter expansion or diameter reduction formed in a fixing ring for fixing the anticorrosion core of the insertion opening. A pair of engaging elements to be fitted are provided at the tips of the pair of opening / closing pieces, respectively, and the fixing ring is expanded or contracted at the insertion opening by the contact / separation of the pair of engaging elements as the pair of opening / closing pieces rotates. In the fixing ring mounting jig to be mounted in a diameter state, the pair of opening / closing pieces are mounted on the fixed side of the toggle mechanism, and the link means for converting the movable side forward / backward movement into the rotary side on the movable side of the toggle mechanism The pair of opening and closing pieces are connected via a pair, and the pair of opening and closing pieces are rotated by advancing and retreating on the movable side so that the pair of engaging elements can be contacted and separated.

  In this way, by operating the toggle mechanism, the shaft always moves forward and backward by a certain distance, and the opening and closing piece always rotates by a certain angle by the movement. Since the engagement element always contacts and separates at a constant distance by the rotation of the opening and closing piece, the work can be quickly performed with one touch. In addition, if the contact / separation distance is set to the expanded or reduced width of the fixed ring, the fixed ring always has a predetermined expanded / reduced diameter width, and the position after the expanded / reduced diameter can be maintained. Can be securely fixed to the insertion slot.

  In the above configuration, the link means includes a rotary shaft that rotatably supports the pair of opening and closing pieces in the same plane on a frame fixedly fixed to the fixed side of the toggle mechanism, and the pair of opening and closing pieces. A shaft that advances and retreats integrally with the rear end and the movable side of the toggle mechanism is composed of a pair of connecting members that are rotatably supported via a rotation axis in the same axial direction as the rotation axis. A configuration in which the pair of connecting members rotates the pair of opening and closing pieces around the rotation axis by advancing and retreating can be adopted.

  In this way, since the opening / closing piece and the movable part of the link means all operate in the same plane, the rotation of the opening / closing piece is stable, and the engaging element is unlikely to come off from the jig hole. For this reason, a fixing ring can be reliably fixed by an insertion port.

One embodiment is shown in FIGS. As shown in FIG. 1, the fixing ring mounting jig 20 of this embodiment connects a pair of opening and closing pieces 21, 21 that face each other via a rotating shaft 31 fixed to a frame 41, A pair of engagement elements 26 and 26 are provided at the tips of the pair of opening and closing pieces 21 and 21, respectively.

  The pair of engagement elements 26, 26 are fixed by fitting pins 27, 27 or screwing them into the distal ends of the auxiliary pieces 22, 22 provided at the distal ends of the pair of opening / closing pieces 21, 21, respectively. The tips of the pins 27 and 27 are used as the engaging members 26 and 26, respectively. The pair of engagement elements 26, 26 are a pair of jig holes 16 for diameter expansion or diameter reduction formed in the fixing ring 10 for fixing the anticorrosion core 3 of the insertion port 2a shown in FIGS. , 16.

The frame 41 on which the rotating shaft 31 is supported is fixed to a fixed side 51 of a toggle mechanism (toggle clamp mechanism) 40 in a stationary manner.
The toggle mechanism 40 includes a fixed side 51 and a movable side 52 that moves forward and backward with respect to the fixed side 51. The fixed side 51 includes the frame 41 and a toggle clamp 41b that is bolted to the frame 41. It consists of a guide boss 43 provided on the toggle clamp 41b.
A shaft 42 that moves forward and backward integrally with the movable side 52 of the toggle mechanism 40 is inserted through the guide boss 43 on the fixed side 51. The movable side 52 has a handle-attached link (hereinafter referred to as a toggle clamp handle) 50 connected to the other end of the shaft 42 via a fixed cylinder 48, a fixing screw 49, and a pin 47, and the toggle clamp handle 50. And a toggle 45 connected to the toggle clamp 41b via pins 44 and 46.

  The frame 41, the toggle clamp 41b, the other end of the shaft 42, the link 45, and the toggle clamp handle 50 that constitute the toggle mechanism 40 constitute a part of the slider / crank mechanism. By rotating in the same chain line (in the direction of arrow R), the other end of the shaft 42 advances by a certain length L away from the guide boss 43 with respect to the frame 41 (guide boss 43). When 50 reaches the state indicated by the chain line in the figure, the other end of the shaft 42 is self-locked so as not to move backward unless the toggle clamp handle 50 is rotated in the reverse direction.

  On the other hand, the pair of opening and closing pieces 21 and 21 are connected via a link means 30 that converts the advancing / retreating motion of the movable side 52 (shaft 42) of the toggle mechanism 40 into a rotational motion.

  The link means 30 includes a rotating shaft 31 that rotatably supports the pair of opening and closing pieces 21 and 21 in a same plane on a frame 41 that is fixedly fixed to the fixed side 51 of the toggle mechanism 40. The pair of opening / closing pieces 21 and 21 has rear ends 32 and 32 and a support portion 36 attached to one end of a shaft 42 that moves forward and backward integrally with the movable side 52 of the toggle mechanism 40. The pair of connecting members 35 and 35 are rotatably supported via the rotation shafts 33 and 34 in the central direction, and the pair of connecting members 35 and 35 are opened and closed by the advancement and retreat of the shaft 42 and the support portion 36. The pieces 21 and 21 are rotated around the rotation shaft 31.

  Accordingly, since the pair of opening / closing pieces 21 and 21 are rotated by the advancement and retraction of the movable side 52, the pair of engaging elements 26 and 26 provided at the distal ends of the pair of opening and closing pieces 21 and 21 are brought into contact / separation (approach and separation). It is possible.

  This embodiment is configured as described above, and the case where the fixing ring 10 shown in FIG. 5 and FIG. 6 is attached using the jig 20 will be described. First, the fixing assembled as shown in FIGS. 6 (a) and 6 (b). The ring 10 is fitted in the groove of the anticorrosion core 3 in the state shown in FIG. 5, and then the engaging element 26 of the jig 20 is fitted in the jig hole 16 (see FIG. 3).

  At this time, the distance between the jig holes 16 and 16 in the fixing ring 10 is not always constant even when the size of the fixing ring 10 is the same and the nominal diameter of the pipe is the same. Each mouth is slightly different. Therefore, when fitting the pair of engaging elements 26, 26 of the jig 20 into the jig holes 16, 16, the opening angle between the pair of opening / closing pieces 21, 21 (distance between the pair of engaging elements 26, 26). ) Need to be fine-tuned. Further, the jig 20 may need to be adjusted in the above distance even when used for an insertion opening having a different nominal diameter of the pipe. Therefore, in that case, the distance can be adjusted by the following method.

That is, as shown in FIG. 2, one end 50 a of the toggle clamp handle 50 of the toggle mechanism 40 is connected to the shaft 42 via a fixed cylinder 48, a fixing screw 49, and a pin 47 so as to be axially movable. It can be fixed at any position in the axial direction by the fixing screw 49.
For this reason, if the fixing screw 49 is loosened, the advance / retreat amount of the movable side 52 (shaft 42) with respect to the fixed side 51 can be adjusted. By adjusting the advance / retreat amount of the shaft 42, the opening angle of the pair of opening / closing pieces 21, 21 and the distance between the pair of engagement elements 26, 26 can be adjusted. Further, when the fixing screw 49 is tightened, the pair of opening and closing pieces 21 and 21 can be fixed so as not to move in the adjusted state. Therefore, as long as the toggle clamp handle 50 is not operated, the distance between the pair of engagement elements 26 and 26 is fixed, and the positioning to the jig holes 16 and 16 is easy.

  Next, when the operation part 50b of the toggle clamp handle 50 is raised and rotated to the opposite side from the solid line state of FIG. 2 to the same chain line state (in the direction of arrow R), the pair of opening and closing pieces 21 and 21 are shown in FIG. It rotates so that it may open from the state shown in FIG. 3 to the state shown in FIG.

  Due to the separation of the pair of engaging elements 26, 26 accompanying this rotation, the diameter of the fixing ring 10 is expanded at the insertion opening 2a (a predetermined diameter expansion force acts on the fixing ring 10). At this time, the other end of the shaft 42 is not retracted unless the toggle clamp handle 50 is rotated in the reverse direction. Moreover, the rotation of the toggle clamp handle 50 is easy due to the nature of the toggle mechanism 40, and the operation can be performed with one touch. Further, the torque (the diameter expansion force of the fixed ring 10) is always constant, and after the diameter expansion, the state can be maintained without applying any force.

  Thereafter, the locking piece 15 of the fixing ring is bent as shown in FIGS. 6C and 5 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 fixing screw 49 is loosened and the jig 20 is removed from the ring 10.

  Note that auxiliary pieces 22 and 22 are provided at the ends of the pair of opening and closing pieces 21 and 21, respectively. Each auxiliary piece 22, 22 is connected to the opening / closing piece 21, 21 in the length direction (rotation) through the illustrated keys 23, 23 and grooves 21 a, 21 a into which the keys 23, 23 are fitted. (Direction away from the shaft 31) The position can be adjusted to an arbitrary position. After selecting the position of the auxiliary pieces 22, 22, the fixing screws 25, 25 inserted into the long holes 24, 24 are inserted at the position. If it fastens and fixes, the contact distance of the engaging elements 26 and 26 can be adjusted. Moreover, according to this method, it becomes possible to deal with insertion holes having different diameters.

  The fixing ring mounting jig 20 of the present invention can be used not only for expanding the diameter of the fixing ring 10 of the anticorrosion core 3 but also for reducing the diameter by changing the rotation direction of the opening / closing piece 21. Of course, it is needless to say that the present invention can be applied not only to the case where the anticorrosion core 3 is interposed, but also to all fixing rings that are fixed by expanding and contracting the diameter.

Perspective view of one embodiment Side view of the same embodiment The state before diameter expansion is shown in the plan view of FIG. The state after diameter expansion is shown in the plan view of FIG. The perspective view which shows the attachment state of a fixing ring It is a perspective view of a fixing ring, (a) is before attachment, (b) is the state fitted before the ring (before diameter expansion), (c) shows the state after diameter expansion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrosion-proof structure 2 Pipe 2a Insert 3 Corrosion-proof core 10 Fixing ring 20 Fixing ring mounting jig 21 Opening and closing piece 22 Auxiliary piece 23 Key 24 Long hole 25, 49 Fixing screw 30 Link means 31, 33, 34 Rotating shaft 32 Rear end 35 connecting member 36 support part 40 toggle mechanism (toggle clamp mechanism)
41 Frame 42 Shaft 43 Guide boss 44, 46, 47 Pin 45 Link 48 Fixed cylinder 50 Toggle clamp handle 51 Fixed side 52 Movable side

Claims (2)

A pair of jig holes 16 for expanding or reducing the diameter formed in a fixing ring 10 that rotatably couples the opposing opening and closing pieces 21 and 21 and fixes the anticorrosion core 3 of the insertion opening 2a. A pair of engagement elements 26 and 26 fitted to the pair 16 are provided at the tips of the pair of opening and closing pieces 21 and 21, respectively, and the pair of engagement elements 26 and 26 are contacted and separated as the pair of opening and closing pieces 21 and 21 rotate. In the fixing ring mounting jig for mounting the fixing ring 10 in a state where the diameter of the fixing ring 10 is expanded or reduced in the insertion opening 2a,
The pair of opening / closing pieces 21 and 21 are attached to the fixed side 51 of the toggle mechanism 40, and the movable side 52 of the toggle mechanism 40 is connected to the pair via the link means 30 for converting the forward / backward movement of the movable side 52 into a rotational movement. The pair of opening and closing pieces 21 and 21 are connected, and the pair of opening and closing pieces 21 and 21 are rotated by the movement of the movable side 52 so that the pair of engaging elements 26 and 26 can be contacted and separated. Ring mounting jig.   The link means 30 includes a rotating shaft 31 that rotatably supports the pair of opening and closing pieces 21 and 21 on a frame 41 fixedly fixed to the fixed side 51 of the toggle mechanism 40, and the pair of the pair of opening and closing pieces 21 and 21. The shafts 42 that advance and retreat integrally with the rear ends 32 and 32 of the opening and closing pieces 21 and 21 and the movable side 52 of the toggle mechanism 40 can be freely rotated via rotation shafts 33 and 34 in the same axial direction as the rotation shaft 31, respectively. The pair of connecting members 35 and 35 are supported by the pair of connecting members 35 and 35, and the pair of connecting members 35 and 35 rotate the pair of opening and closing pieces 21 and 21 around the rotation shaft 31 by the advance and retreat of the shaft 42. The fixing ring mounting jig according to claim 1.

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