JP5616090B2 - Clamping device - Google Patents

Description

  The present invention relates to a clamp device used when connecting piping materials using an electric fusion joint.

An electric fusion joint (EF joint) is used for connection of thermoplastic resin piping materials such as polyethylene pipes.
In the electric fusion joint, the ends of the piping materials to be connected are inserted into the joint receptacles, respectively, and the heater wires embedded in the joints are energized along the inner wall surfaces of the joints. The interface with the pipe material to be connected is melted and fused.

Further, when the piping material is fused using the electric fusion joint, it is necessary to support and fix the piping material so that the piping material does not move until the fusion is completed.
Therefore, as shown in FIG. 16, a first pipe clamper 120 that can be freely opened and closed is fixed to one end of the support shaft 110, and a second pipe clamper 130 having the same size as the first pipe clamper 120 is mounted on the support shaft 110. Has already been proposed (see Patent Document 1).

That is, as shown in FIG. 16, the clamping device 100 is configured to change the distance between the first pipe clamper 120 and the second pipe clamper 130 by sliding the second pipe clamper 130 along the support shaft 110. The electric fusion joint 200 can be changed according to the size.
In addition, as shown in FIG. 17, the clamp device 100 fixes the adapter 140 to the support shaft 110, attaches an auxiliary shaft 150 to the adapter 140, and supports the second pipe clamper 130 on the auxiliary shaft 150. In addition, the connection pipe P can be fused to the elbow type electric fusion joint 300.

Japanese Unexamined Patent Publication No. H8-197435

However, in the clamp device 100, the second pipe clamper 130 includes the fixing knob 131, and after the fixing knob 131 is loosened, the second pipe clamper 130 is slid on the support shaft 110 that is a round bar. Since the position is adjusted by tightening the fixing knob 131 again, there is a problem that positioning is difficult.
Further, when the connection pipe P is fused to the elbow type electric fusion joint 300, the joint 300 and the connection pipe P are substantially L-shaped, and the shaft 110 is L-shaped along this. Since they are arranged side by side, a large work space is required, and there is a problem that workability is poor particularly in a narrow pipe shaft.

  In view of the above circumstances, an object of the present invention is to provide a clamp device that has a small number of parts and can easily and reliably position a clamp portion.

In order to achieve the above object, a clamping device according to the present invention is a clamping device that prevents misalignment between a connection pipe fitted to an electric fusion joint and an electric fusion joint at the time of fusion. A plurality of clamp main bodies each having a column portion having a non-circular columnar positioning portion, a clamp portion that is supported and fixed to one end of the column portion and clamps the connection pipe, and the positioning portion is fitted in a non-rotating state. Three or more positioning recesses to be inserted, and by selectively fitting the positioning portions of the clamp body into these positioning recesses, the distance between the two clamp bodies and the clamp axis of the two clamp bodies angle is a one supporting plate for supporting the state of being retained at a distance and angle to the melt bonding conditions of the support plate, an elongated rectangle in plan view Te is characterized in that in alignment all the positioning recess along the rectangular longitudinal axis of the support plate.

  In this invention, a clamp axis | shaft means the axis | shaft along the center axis | shaft of the connection pipe clamped by a clamp part.

The clamping device of the present invention is not particularly limited, but preferably includes a fixing structure that prevents the positioning portion from being detached from the positioning recess while the positioning portion of the clamp body is fitted in the positioning recess.
The fixing structure is not particularly limited. For example, the clamp main body includes a male screw portion extending from the other end of the positioning portion, and the support plate is inserted into the bottom of the positioning recess from the male screw portion penetrating to the back surface of the support plate. A male screw part insertion hole with a short length is formed, and the clamp body is fixed to the support plate by screwing a nut from the back side of the support plate to the tip of the male screw part inserted into the male screw part insertion hole. Structure is mentioned. Further, a magnet may be arranged on the bottom of the positioning recess, and the positioning portion may be attracted and fixed.

  The structure of the clamp part is not particularly limited as long as the connection pipe can be easily clamped. For example, the first clamp is formed in a substantially semicircular arc shape along the outer wall surface of the connection pipe to be clamped and fixed to one end of the column. The first clamp body is supported by the first clamp body in a substantially semicircular arc shape along the outer wall surface of the body and the connecting pipe to be clamped, and one end of the arc is rotatably supported by one end of the arc of the first clamp body via the hinge. The structure provided with the 2 clamp body and the fixing means which suppresses rotation of a 2nd clamp body in the state which clamped the connection pipe between the 1st clamp body and the 2nd clamp body is mentioned.

  In addition, when the clamp portion has the above structure, for example, it can be detachably attached to the inside of the arcs of the first clamp body and the second clamp body, and in the mounted state to the first clamp body and the second clamp body, Provided with at least a pair of attachments capable of clamping a connection pipe having a desired diameter smaller than the connection pipe clamped by the first clamp body and the second clamp body when the second clamp body is prevented from rotating by the fixing means. It is good also as composition which has.

  In the present invention, the cross-sectional shape of the positioning portion is not particularly limited as long as it is non-circular, and examples thereof include shapes shown in FIGS. 6 (a) to 6 (j).

The shape of the support plate is not particularly limited, but it is preferably a thin plate shape as long as possible so as not to be bulky.
Further, the arrangement of the positioning recesses on the support plate is not particularly limited and may be arranged in a line or in a plurality of lines. However, in consideration of workability in a narrow pipe shaft, the support plate is flat. It is preferable that the support plate is elongated as a generally rectangular shape, and all the positioning recesses are aligned along the long axis of the rectangle.
The cross-sectional shape of the positioning recess is not particularly limited as long as the positioning recess is fitted and the rotation is prevented and the posture can be maintained in a desired posture.

  A clamp device according to the present invention includes a plurality of clamp bodies having a column portion having a columnar positioning portion having a non-circular cross section and a clamp portion that is supported and fixed to one end of the column portion and clamps a connection pipe. The positioning portion has three or more positioning recesses that fit in a non-rotating state, and the clamp body is selectively fitted into these positioning recesses so that the two clamp bodies can be connected between the two clamp bodies. And a support plate that supports the distance between the two clamp bodies and the angle formed by the clamp axes of the two clamp bodies in a state that is maintained at the distance and angle suitable for the fusion condition, so that the number of parts is small and the positioning of the clamp part is easy And it can be done reliably.

1 is a plan view showing a clamp device according to an embodiment of the present invention in a state in which a clamp body is arranged at a fusion fixing position using a socket type electric fusion joint. It is a top view of the state which has arrange | positioned the clamp main body of the clamp apparatus of FIG. 1 in the fusion fixing position using a 90 degree elbow type electric fusion joint. It is sectional drawing of the clamp main-body part of the clamp apparatus of FIG. It is sectional drawing which made the 2nd clamp body of the clamp main-body part of FIG. 3 the open state. It is a side view of the clamp main-body part of the state which removed the nut. It is a figure showing the example of the cross-sectional shape of the positioning part of a clamp apparatus. It is a top view of the support plate of the clamp apparatus of FIG. It is a Z direction arrow line view of FIG. 8A and 8B are cross-sectional views of the support plate of FIG. 7, in which FIG. 7A is a cross-sectional view taken along line XX of FIG. 7, and FIG. It is sectional drawing showing the attachment with which the clamp apparatus of FIG. 1 is mounted | worn. It is sectional drawing of the axial part attached to an attachment main body. It is sectional drawing of the clamp main-body part of the state which attached the attachment. It is a figure showing the state which carries out the fusion | melting joining of the polyethylene pipe | tube of 50A to a cheese type electric fusion joint using the clamp apparatus of FIG. It is a figure showing the state which carries out the fusion | melting joining of the 50A polyethylene pipe to a 90 degree elbow type electric fusion joint using the clamp apparatus of FIG. It is a top view of the support plate of 2nd Embodiment of the clamp apparatus concerning this invention. It is a top view showing the state where a connection pipe is fusion-fixed to a socket-type electric fusion joint using a known clamping device. FIG. 17 is a plan view showing a state in which a connection pipe is fusion-fixed to a 90 ° elbow type electric fusion joint using the clamp device of FIG. 16.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 and 2 show a first embodiment of a clamping device according to the present invention.

As shown in FIGS. 1 and 2, the clamp device 1 includes two clamp bodies 2 and a single support plate 3a.
As shown in FIGS. 3 to 5, the clamp body 2 includes a clamp portion 4, a support column portion 5, a male screw portion 6, and a wing nut 7.

The clamp unit 4 includes a first clamp body 41 and a second clamp body 42 made of a metal material such as steel or stainless steel.
Each of the first clamp body 41 and the second clamp body 42 has a substantially semicircular arc shape along the outer wall surface of a connecting pipe having a maximum outer diameter (for example, a 50A polyethylene pipe) clamped by the clamping device 1. One ends of the arcs are connected to each other via a hinge 43, and the second clamp body 42 is rotatable about the hinge 43 as shown in FIG. 4.

Further, the first clamp body 41 is provided with a shaft insertion hole 41a through which a shaft main body 85a of an attachment 8a (8b to 8d) described later is inserted in the center of the arc, and outside the center of the arc. One end of the support column 5 is fixed to the wall surface.
At the other end of the arc of the first clamp body 41, a first extending portion 44 constituting a part of the fixing means is integrally provided.

The first extending portion 44 includes a notch groove 44a at the center in the width direction from the tip toward the first clamp body 41, and is rotatable through the pivot shaft 45a and is pivoted through the first notch groove. The fixing bolt 45 that constitutes a part of the fixing means that enters the inside 44a is integrally provided.
As shown in FIG. 3, the fixing bolt 45 is configured such that a nut 46 with a handle that constitutes a part of the fixing means is screwed.

The second clamp body 42 has a shaft portion insertion hole 42a through which a shaft portion main body 85a of an attachment 8a (8b to 8d), which will be described later, is inserted at the center portion of the arc, and is formed on the outer wall surface of the center portion of the arc. The fitting tube portion 47 into which the shaft body 85a of the attachment 8a (8b to 8d), which will be described in detail later, is fitted is fixed.
Further, a second extending portion 48 constituting a part of the fixing means is integrally provided at the other end of the arc of the second clamp body 42.
The second extending portion 48 includes a second cutout groove 48a that is approximately the same size and size as the first cutout groove 44a at a position symmetrical to the first cutout groove 44a.

The column portion 5 has a substantially oval shape in cross section as shown in FIG. 6A over the entire length, the male screw portion 6 side is a positioning portion 51, and the shaft portion insertion hole of the first clamp body 41. A fitting hole 52 into which a shaft body 85a of an attachment 8a (8b to 8d) described later is fitted is formed at a position facing 41a.
The male screw portion 6 extends from the other end (end on the positioning portion 51 side) of the column portion 5, and a wing nut 7 which will be described in detail later is screwed thereon. The length of the male screw part insertion hole 32 of 3a is longer than the screwing allowance of the wing nut 7.

As shown in FIG. 7, the support plate 3 a has an elongated rectangular shape with four corners chamfered in plan view, and positioning recesses 31 are formed at symbol positions A to G shown in FIG. 8. Yes.
Whether the positioning recess 31 has the same cross-sectional shape as the cross-sectional shape of the positioning portion 51 (that is, a substantially oval shape) and the size thereof is substantially the same as the cross-sectional shape of the positioning portion 51. A little bigger.
All of the positioning recesses 31 and the male screw part insertion holes 32 are provided in the support plate 3a so as to be aligned in a straight line along the long axis of the rectangle.

The positioning recess 31 at the symbol positions A, C, D, and G is provided so that the major axis direction of the oval shape is orthogonal to the major axis of the support plate 3a, and the positioning recess 31 at the symbol position B is The oval type major axis is inclined 45 ° counterclockwise as viewed in FIG. 7 with respect to the major axis of the support plate 3a, and the positioning recess 31 at the symbol positions E and F is provided with the oval major axis. The direction is inclined by 45 ° in the clockwise direction as viewed in FIG. 7 with respect to the long axis of the support plate 3a.
Further, the positioning recess 31 at the symbol positions of A, C, D, and G is set so that the distance between the positioning recess 31 at the symbol position of A and the positioning recess 31 at the symbol position of C is α and the symbol position of A. The interval between the positioning recess 31 and the positioning recess 31 at the C symbol position is β, the interval between the positioning recess 31 at the D symbol position and the positioning recess 31 at the G symbol position is γ, and the C symbol When the interval between the positioning recess 31 at the position and the positioning recess 31 at the G symbol position is δ, δ>β>γ> α is formed.
Furthermore, as shown in FIG. 9, each positioning recess 31 is provided with a male thread portion insertion hole 32 so as to penetrate the back surface side of the support plate 3 a.

Further, as shown in FIG. 10, the clamp device 1 includes four pairs of attachments 8 a to 8 d having different diameters of connection pipes that are detachably attached to the clamp body 2 (hereinafter referred to as “clamp diameters”). ing.
Each attachment 8a to 8d includes an attachment main body 81 (82 to 84) and a shaft portion 85.

The attachment body 81 is made of aluminum or engineering plastic, and has an outer diameter that is substantially the same as or slightly smaller than the inner diameters of the first clamp body 41 and the second clamp body 42, and the inner diameter is a connecting pipe to be clamped (for example, , 40A polyethylene pipe) having an arc shape with a diameter along the outer wall surface, and the width thereof is substantially the same as that of the first clamp body 41 and the second clamp body 42.
A screw hole 86 is formed in the center of the arc of the attachment main body 81.

As shown in FIG. 11, the shaft portion 85 has a shaft portion main body 85 a at one end and a male screw portion 85 b that is screwed into the screw hole 86 at the other end.
The shaft body 85a has an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the fitting hole 52 and the fitting cylinder 47, and is provided with a blade receiving groove for a driver (not shown). 85c and a trunk portion 85d. The trunk portion 85d is provided with a ring-shaped groove 85e in the vicinity of the head 85c, and an O-ring 85f is fitted into the groove 85e. The outer diameter of the O-ring 85f is slightly larger than the inner diameter of the fitting hole 52 and the fitting cylinder portion 47.
In addition, in the attachments 8 a to 8 d, the male screw portion 85 b of the shaft portion 85 is screwed into the screw hole 86 of the attachment main body 81, and only the shaft portion main body 85 a protrudes from the attachment main body 81.

The attachments 8b to 8d are formed so that the attachment main body 82 (83, 84) is thick in the radial direction of the arc and the inner diameter of the arc is along the outer wall surface of the polyethylene pipe of 30A (25A, 20A). Except for the above, it is the same as the attachment 8a.
That is, the attachment 8a is for a polyethylene pipe of 40A, the attachment 8b is 30A, the attachment 8c is 25A, and the attachment 8d is 20A.

  Then, the attachment 8a (8b to 8d) is compressed and deformed by fitting the shaft body 85a into the fitting hole 52 or the fitting cylinder 47 as shown in FIG. The inner cylinder 47 is pressed against the inner wall surface and is held inside the first clamp body 41 or the second clamp body 42.

  Next, when the polyethylene pipe P1 is fusion-bonded to the cheese-type electric fusion joint 9a using the clamp device 1, each of the cases when the polyethylene pipe P1 is fusion-bonded to the 90 ° elbow type electric fusion joint 9b. The procedure will be described.

[Procedure for Fusion Bonding of Polyethylene Pipe P1 and Electrical Fusion Joint 9a]
(1) A case where a 50A polyethylene pipe P1 is fusion-bonded to a corresponding cheese-type electric fusion joint 9a will be described as an example. First, as shown in FIG. Fix to the symbol position of J. That is, the two clamp bodies 2 are fixed using the positioning recesses 31 at the symbol positions A and J of the support plate 3a. As shown in FIG. 13, by this fixing, the clamp body 2 and the clamp body 2 are held at an interval at which the electrofusion joint 9a can be inserted, and the clamp shafts of the clamp portion 4 are aligned in a straight line.
(2) As shown in FIG. 5, the nut 46 is removed from the fixing bolt 45, and as shown in FIG. 4, the second clamp body 42 is rotated to open the upper side of the first clamp body 41.
(3) As shown in FIG. 13, the end of the polyethylene pipe P1 is inserted to a predetermined depth into the receiving ports 91 on both sides of the cheese type electrofusion joint 9a.
(4) The electrofusion joint 9a is disposed between the clamp body 2 and the clamp body 2, and one polyethylene pipe P1 is received by the first clamp body 41 of the one clamp body 2, and the other polyethylene pipe P1. Is received by the first clamp body 41 of the other clamp body 2.
(5) After rotating the second clamp bodies 42 of the clamp bodies 2 on both sides until the first extension portion 44 and the second extension portion 48 are opposed to each other, the fixing bolt 45 is attached to the pivot shaft 45a. To the center of the first notch groove 44a and the second notch groove 48a.
(6) The nut 46 is screwed into a portion protruding from the second notch groove 48a of the second extension 48 of the fixing bolt 45, and as shown in FIGS. 3 and 13, the first clamp body 41 and the second clamp A 50A polyethylene pipe P1 is clamped between the body 42 and the polyethylene pipe P1 is inserted into the electrical fusion joint 9a up to a predetermined position of the receiving port 91 and fixedly supported.
(7) In the same manner as in the prior art, power is supplied between the terminals of the electrofusion joint 9a to fuse the polyethylene pipe P1 and the electrofusion joint 9a.
The procedure (3) may be performed before the procedures (1) and (2).

  In addition, as shown in FIG. 12, the clamp device 1 has an attachment 8a set on the clamp body 2, and although not shown, A or C (clamps a portion as close as possible to the electrofusion joint 9a of the polyethylene pipe P1). Thus, the electrical fusion joint 9a and the polyethylene pipe P1 can be more accurately aligned with each other. Preferably, the fixing recess 31 at the symbol position C) and the positioning recess 31 at the symbol position G are fixed to the support plate 3a. Then, a 40A polyethylene pipe can be fused to a 40A cheese-type electric fusion joint.

  Although not shown, for example, the attachment 8b is set on the clamp body 2, and the positioning recess 31 at the position of the symbol A and the portion as close as possible to the electrical fusion joint 9a of the polyethylene pipe P1 are clamped. Then, since the electrical fusion joint 9a and the polyethylene pipe P1 can be aligned more accurately, the 30A polyethylene pipe is used for 30A by fixing the support plate 3a using the positioning recess 31 at the symbol position of D). The attachment 8c is set on the clamp body 2, and the positioning recess 31 at the D symbol position and the positioning recess 31 at the G symbol position, or for the above 50A to 30A The position of the symbol (clamp the portion of the polyethylene pipe P1 as close as possible to the electrofusion joint 9a, Since the axial alignment of the ethylene pipe P1 can be performed more accurately, a 25A polyethylene pipe is preferable if it is fixed to the support plate 3a using the positioning recess 31 at the D symbol position and the positioning recess 31) at the G symbol position. Can be fused to a 25A cheese-type electric fusion joint, the attachment 8d is set on the clamp body 2, the positioning recess 31 at the symbol position A, the positioning recess 31 at the symbol position C, or the above-mentioned 50A- Symbol position for 25A (Preferably, the position of the symbol of A is preferably selected because the portion of the polyethylene pipe P1 that is as close as possible to the electric fusion joint 9a can be clamped and the electric fusion joint 9a and the polyethylene pipe P1 can be more accurately aligned. If the fixing plate 31a is fixed to the supporting plate 3a using the positioning concave portion 31 and the positioning concave portion 31) at the symbol C position, Be fixed to the over preparative 3a, can be fused 20A polyethylene tubing cheese type electric welding joint for 20A.

[Procedure for Fusion Bonding of Polyethylene Pipe P1 and Electrical Fusion Joint 9b]
(1) The case where 50A polyethylene pipe P1 is fusion-bonded to the corresponding elbow type electric fusion joint 9b will be described as an example. First, as shown in FIG. Fix to the symbol position of F. That is, the two clamp bodies 2 are fixed using the positioning recesses 31 at the symbol positions B and F of the support plate 3a. With this fixing, the clamp main body 2 and the clamp main body 2 are held at an interval where the electric fusion joint 9b can be inserted, and the clamp shafts of the clamp portions 4 of the two clamp main bodies 2 intersect at an angle of 90 °. It becomes like this.
(2) As shown in FIG. 5, the nut 46 is removed from the fixing bolt 45, and the second clamp body 42 is rotated so that the upper side of the first clamp body 41 is opened.
(3) As shown in FIG. 14, the end of the polyethylene pipe P1 is inserted to a predetermined depth into the receiving ports 91 on both sides of the electrofusion joint 9b.
(4) Set so that one polyethylene pipe P1 is received by the first clamp body 41 of the one clamp body 2 and the other polyethylene pipe P1 is received by the first clamp body 41 of the other clamp body 2.
(5) After rotating the second clamp bodies 42 of the clamp bodies 2 on both sides until the first extending portion 44 and the second extending portion 48 face each other, the fixing bolt 45 is attached to the pivot shaft 45a. Through the first notch groove 44a and the second notch groove 48a.
(6) The nut 46 is screwed into a portion protruding from the second notch groove 48a of the second extension 48 of the fixing bolt 45, and as shown in FIG. 13, the first clamp body 41 and the second clamp body 42 The polyethylene pipe P1 of 50A is clamped in between, and the polyethylene pipe P1 is inserted and fixed to the predetermined position of the receiving port 91 in the electrofusion joint 9b.
(7) In the same manner as in the prior art, power is supplied between the terminals of the electrofusion joint 9b to fuse the polyethylene pipe P1 and the electrofusion joint 9b.
The procedure (3) may be performed before the procedures (1) and (2).

In addition, as shown in FIG. 12, this clamping device 1 is similar to the case of 50A except that the attachment 8a is set on the clamp body 2, and a 40A polyethylene pipe is an elbow type electrofusion joint for 40A. Can be fused.
Although not shown, for example, the attachment 8b is set on the clamp body 2, and the positioning recess 31 at the symbol position B and E or F (the portion as close as possible to the electrofusion joint 9a of the polyethylene pipe P1) are clamped. Then, since the axial alignment of the electrofusion joint 9a and the polyethylene pipe P1 can be more accurately performed, if the positioning recess 31 at the symbol position of E) is fixed to the support plate 3a, the 30A polyethylene pipe is attached to the 30A elbow. It can be fused to the type of electric fusion joint, the attachment 8c is set in the clamp body 2, and the positioning recess 31 at the symbol position B and E or F (the portion as close as possible to the electric fusion joint 9a of the polyethylene pipe P1 are clamped In view of the fact that the axial alignment of the electrofusion joint 9a and the polyethylene pipe P1 can be more accurately performed, the description of E) is preferable. If it is fixed to the support plate 3a using the positioning recess 31, the 25A polyethylene pipe can be fused to the 25A elbow type electric fusion joint, the attachment 8d is set on the clamp body 2, and the symbol B position The positioning recess 31 and E or F (preferably the portion of the polyethylene pipe P1 that is as close as possible to the electric fusion joint 9a can be clamped so that the electric fusion joint 9a and the polyethylene pipe P1 can be more accurately aligned. ) Is fixed to the support plate 3a using the positioning recess 31 at the symbol position, the 20A polyethylene pipe can be fused to the 20A elbow type electric fusion joint.

In addition, although not shown in the drawings, the clamp device 1 may have a different diameter polyethylene using a reducer or the like if an attachment 8a (8b to 8d) for a smaller diameter than the other clamp body 2 is set in one clamp body 2. The pipe P1 can also be fused and fixed.
Further, for example, if the clamp body 2 is fixed to the support plate 3a using the positioning recess 31 at the symbol position A and the positioning recess 31 at the symbol position E (or F), a 45 ° elbow is used. Can also be used for fusion fixing.

As described above, the clamp apparatus 1 is provided with a plurality of positioning recesses 31 in one support plate 3a, and selects one of the positioning recesses 31 to fix the clamp body 2 to thereby fix the electrofusion joint 9a. Depending on the size or type of (or 9b), the distance between the clamp bodies 2 and the angle formed between the two clamp bodies 2 and the clamp shaft of the clamp portion 4 can be changed.
Therefore, unlike the conventional clamping device 100, the clamping device 1 does not require a separate adapter 140 or auxiliary shaft 150, and the number of parts is reduced.

In addition, since the four pairs of attachments 8a to 8d are provided, it is possible to accurately fix and fix the polyethylene pipe P1 having five types of diameters by attaching and detaching the attachments 8a to 8d.
Further, as shown in FIG. 3, since the support plate 3a is in the shape of a long and narrow rectangle, it is not bulky, and as shown in FIG. The tube can be fusion-fixed to the electric fusion joint 9a (9b).

FIG. 15 shows a support plate of the second embodiment of the clamping device according to the present invention.
That is, as shown in FIG. 15, this support plate 3b has 13 positioning recesses 33 provided at equal pitches in the longitudinal direction of the support plate 3b.

Each positioning recess 33 has a cross-sectional shape in which one diagonal is parallel to the major axis of the support plate 3b and the other diagonal is orthogonal to the major axis of the support plate 3b, and the square has a diagonal of 45 °. It has the shape of an eight-pointed star with overlapping squares of the same size.
A male thread portion insertion hole 34 is formed in the center of the bottom of each positioning recess 33.

Although this support plate 3b is not shown in the figure, a clamp body having a positioning portion having a square cross section shown in FIG. 6B or an octagonal star shape shown in FIG. 6D is used. it can.
That is, according to the support plate 3b, if the clamp body is rotated by 45 ° at the same positioning recess 33, the clamp shaft of the clamp portion of the clamp body can be rotated by 45 ° at the same location.
Therefore, even if the longitudinal dimension of the support plate 3b is not so large, if the two clamp bodies are provided with many pairs of attachments having different clamp diameters, a single support plate 3b has many connection pipes having different diameters. Are clamped at a portion as close as possible to the electric fusion joint, so that the electric fusion joint and the polyethylene pipe can be aligned more accurately.

The clamping device according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the cheese type, the 90 ° elbow type, and the reducer type are described as examples of the electric fusion joint, but the socket type, the 45 ° elbow type, and the 22.5 ° elbow type electric fusion joint. It can also be used to fuse and fix the connecting pipe to the joint.
In the above embodiment, the support column has the same cross-sectional shape as the positioning portion over the entire length, but the portions other than the positioning portion that do not fit in the positioning recess may have different cross-sectional shapes. The entire support portion may be a positioning portion.

In the above embodiment, the attachment can be attached to the clamp portion by inserting the shaft portion main body into the fitting cylinder portion and the fitting hole provided in the clamp portion, but the screw provided on the clamp side You may enable it to fix an attachment main body to a clamp part by screwing a fixing screw in a hole through an attachment main body.
In the above embodiment, the clamp surfaces of the first clamp body, the second clamp body, and each attachment are arc-shaped along the outer wall surface of the corresponding size connection pipe. You may have the shape of.

P1 Polyethylene pipe (connection pipe)
DESCRIPTION OF SYMBOLS 1 Clamp apparatus 2 Clamp main body 3a, 3b Support plate 31, 33 Positioning recessed part 32, 34 Male thread part insertion hole 4 Clamp part 41 1st clamp body 42 2nd clamp body 42a 2nd extension part (fixing means)
43 Hinge 44 First extension (fixing means)
45 Fixing bolt (fixing means)
46 Nut (fixing means)
47 Second extension (fixing means)
5 Supporting part 51 Positioning part 6 Male thread part 7 Wing nut 8a Attachment 8b Attachment 8c Attachment 8d Attachment 9a Electric fusion joint (Cheese type)
9b Electric fusion joint (90 ° elbow type)

Claims (5)

A clamp device for preventing displacement between a connecting pipe fitted to an electric fusion joint at the time of fusion and an electric fusion joint,
A plurality of clamp bodies having a column portion having a non-circular columnar positioning portion and a clamp portion that is supported and fixed to one end of the column portion and clamps the connection pipe;
The positioning portion has three or more positioning recesses that fit in a non-rotating state, and the two clamp bodies are placed between the two clamp bodies by selectively fitting the positioning portions of the clamp body into these positioning recesses. A support plate that supports the distance and the angle formed by the clamp shafts of the two clamp bodies that are held at the distance and angle that meet the fusion conditions, and the support plate has an elongated rectangular shape in plan view. The clamping device is characterized in that all the positioning recesses are aligned along the long axis of the rectangular support plate . The clamping device according to claim 1, wherein the positioning concave portion of the support plate and the positioning portion of the clamp body have an oval cross section. Among the positioning recesses of the support plate, some of the positioning recesses are provided so that the long axis direction of the oval mold is at an angle of 45 degrees with respect to the long axis direction of the rectangular shape of the support plate. 3. The clamp device according to claim 2 , wherein the concave portion is provided such that the long axis direction of the oval mold is at an angle of 90 degrees with respect to the long axis direction of the rectangular shape of the support plate . The clamp body has a male thread that extends from the other end of the positioning part, and the support plate is positioned
Male thread part with a shorter length than the male thread part that penetrates to the bottom of the support plate at the bottom of the fixed recess
An insertion hole is drilled, and the end of the male screw part where the clamp body is inserted into the male screw part insertion hole
The clamp device according to any one of claims 1 to 3, wherein a nut is screwed onto the end from the back side of the support plate and fixed to the support plate . The clamp part of the clamp body has a substantially semicircular arc shape along the outer wall surface of the connecting pipe to be clamped.
A first clamp body fixed to one end of the column;
The semicircular arc is formed along the outer wall surface of the connection pipe to be clamped, and one end of the arc is first through the hinge.
A second clamp body rotatably supported by the first clamp body at one end of an arc of the clamp body;
In a state where the connecting pipe is clamped between the first clamp body and the second clamp body,
And a fixing means for inhibiting the rotation, freely respectively loading and unloading on the inside of the circular arc of the first clamping member and the second clamping member, in the mounted state of the to the first clamping member and the second clamping member, the fixed At least a pair of attachments capable of clamping a connection pipe having a smaller diameter than the connection pipe clamped by the first clamp body and the second clamp body when the second clamp body is prevented from rotating by the means. The clamp apparatus in any one of Claims 1-3 .

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