JP4409046B2 - Elbow clamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elbow clamp used when connecting a resin pipe via a fusion joint. In particular, the present invention relates to an elbow clamp that does not require a large construction space during use.
[0002]
[Prior art and problems to be solved by the invention]
In recent years, polyethylene pipes have been frequently used for city gas piping. This is because polyethylene pipes are more resistant to corrosion and earthquake than conventional plated steel pipes, and are excellent in workability of piping work. In order to connect this polyethylene pipe, a method is generally used in which an electrofusion joint (abbreviated as EF joint) is used and the outer peripheral surface of the end of the pipe and the inner peripheral surface of the EF joint are fusion bonded. It has been.
[0003]
In a resin pipe joining operation using a general EF joint, the end of the resin pipe to be joined is inserted into the joint hole of the EF joint, and then the resin pipe is fixed by a clamp, and then the heating wire of the EF joint is used. Energize to. The heating wire generates heat by Joule heat, melts polyethylene, and integrates the resin pipe and the EF joint. Thereby, two resin pipes can be connected via an EF joint.
[0004]
By the way, if the resin pipe is misaligned in the EF joint during the fusion between the resin pipe and the EF joint, there is a possibility that a defect occurs in the joint portion. Therefore, the fixing by the clamp has a significant influence on the success or failure of the joining operation.
[0005]
There are various types of EF joints to cope with various types of piping, and one of them is an elbow type.
As a conventional example of an elbow clamp used for connection of such an elbow type EF joint, for example, there is one disclosed in JP-A-8-197435.
FIG. 4 is an enlarged side view showing details of the clamp clamper of the above publication.
FIG. 5 is a plan view showing the overall configuration and usage of the clamp of the above publication.
The clamp shown in FIGS. 4 and 5 includes a support shaft 101. A first pipe clamper 102 is attached to one end of the support shaft 101 (the right end in FIG. 5). As shown in FIG. 4, the first pipe clamper 102 includes a fixed side clamp member 104 and an open / close side clamp member 105. The fixed clamp member 104 is fixed to the end of the support shaft 101 with a pin 106. The open / close clamp member 105 is attached to be rotatable about the support shaft 101. A through hole 111 is formed in the open / close clamp member 105. Further, a spring 107 is provided between the clamp members 104 and 105.
[0006]
The first pipe clamper 102 includes an opening degree adjusting mechanism 100. The opening adjustment mechanism 100 has a nut 108 and a push screw 112.
The nut 108 has a sleeve shape. One end (the right end in FIG. 4) of the nut 108 is attached to the fixed-side clamp member 104 by a pin 109. The nut 108 can swing up and down around the pin 109. A portion near the other end (left end in FIG. 4) of the nut 108 has a smaller inner diameter than the other portions. A female screw 110 is cut on the inner surface of the small inner diameter portion.
[0007]
The push screw 112 is inserted into the nut 108. This push screw 112 has an unthreaded portion (straight portion) 118 on the insertion end side (right end in FIG. 4) and an external thread portion 116 on the protruding end side (left end in FIG. 4). The push screw 112 penetrates through the through hole 111 of the open / close clamp member 105 and protrudes outward. A flange-shaped large-diameter portion 115 is formed at the end of the unthreaded portion 118 of the push screw 112. The large-diameter portion 115 hits a step portion (not shown) on the inner surface of the nut 108 in a state where the open / close side clamp member 105 is most widely opened (state shown in FIG. 4). Thereby, the push screw 112 does not come off from the nut 108. The male thread portion 116 of the push screw 112 is screwed into the female thread 110 of the nut 108. A knob 113 is fixed to the end of the male screw 116 by a nut 114.
[0008]
As shown in FIG. 5, an adapter 122 is slidably attached to the other end of the support shaft 101 (the left end in FIG. 5). The adapter 122 includes an auxiliary support shaft 121 positioned orthogonal to the support shaft 101. The adapter 122 includes a fixing knob 119. The auxiliary support shaft 121 can be fixed at a predetermined position on the support shaft 101 by the fixing knob 119. The lower surface of the support shaft 101 is slightly chamfered over a predetermined length from the left end of FIG. 5, and the stopper 123 provided on the adapter 122 hits the end of the chamfered portion, so that the adapter 122 is deeper than the position of FIG. 5. Can not be inserted. A second pipe clamper 103 having the same size and configuration as the first pipe clamper 102 is detachably attached to the other end of the support shaft 121 (the upper end in FIG. 5).
[0009]
Next, the usage method of this elbow clamp is demonstrated.
As shown in FIG. 5, when two resin pipes 131 and 132 are connected via an elbow type EF joint 133, the resin pipes 131 and 132 are respectively inserted into both sides of the EF joint 133. On the other hand, the first and second pipe clampers 102 and 103 of the elbow clamp are in an open state as shown in FIG. That is, the knob 113 is turned to release the threaded engagement between the male thread portion 116 of the push screw 112 and the female thread 110 of the nut 108. At this time, the fixed side clamp member 104 and the open / close side clamp member 105 are separated from each other by the biasing force of the spring 107.
[0010]
Then, an elbow clamp is inserted from the outside (back side) of the EF joint 133, and the resin pipes 131 and 132 are sandwiched between the fixed side clamp member 104 and the open / close side clamp member 105. Next, the auxiliary support shaft 121 is fixed at a predetermined position on the support shaft 101 by operating the fixing knob 119 and appropriately sliding the adapter 122. Further, in each of the first and second pipe clampers 102 and 103, first, the knob 113 is pushed in until the tip of the male thread portion 116 of the push screw 112 starts to engage with the female screw 110 of the nut 108, and the open / close side is pushed. The clamp member 105 is quickly closed. Next, turning the knob 113 causes the push screw 112 to enter the nut 108. Along with this, the open / close side clamp member 105 is closed to the side approaching the fixed side clamp member 104, and finally, each of the resin pipes 131 and 132 can be clamped.
[0011]
However, since the elbow clamp shown in FIGS. 4 and 5 is inserted from the outside (back side) of the elbow type EF joint 133, an extra space for inserting the elbow clamp is provided at the corner of the excavation groove for pipe placement. Must be taken widely. Furthermore, since the first and second pipe clampers 102 and 103 sandwich the resin pipes 131 and 132 from above and below, an extra construction space is required between the lower side of the resin pipes 131 and 132 and the bottom of the excavation groove. It is.
[0012]
In addition to the elbow clamp disclosed in the above publication, an elbow clamp as shown in FIGS. 6 and 7 is also known.
6A and 6B are diagrams showing a closed state (pipe clamp state) of another example of the conventional elbow clamp, where FIG. 6A is a perspective view and FIG. 6B is a partial sectional side view.
7A and 7B are views showing an open state (clamp release state) of the elbow clamp in FIG. 6, wherein FIG. 7A is a perspective view and FIG. 7B is a partial cross-sectional side view.
[0013]
This elbow clamp includes an upper clamper 201 and a lower clamper 202. The upper clamper 201 and the lower clamper 202 are combined with each other via a pivot 205 so as to be rotatable relative to each other. A spring 207 is fitted on the pivot 205. By this spring 207, the upper clamper 201 and the lower clamper 202 are urged toward the side away from each other.
[0014]
The upper clamper 201 includes two clamp pieces 211 and 212. The clamp pieces 211 and 212 respectively extend obliquely forward to the left and right. The opening between the clamp pieces 211 and 212 is 90 °. The ends of the clamp pieces 211 and 212 are curved in a bowl shape (semi-circular shape). On the other hand, the lower clamper 202 also includes two clamp pieces 221 and 222. The clamp pieces 221 and 222 of the lower clamper 202 are provided symmetrically with the clamp pieces 211 and 212 of the upper clamper 201. In the closed state of the upper and lower clampers 201 and 202 (FIG. 6), a circular space 200 for sandwiching the pipe is formed between the clamp pieces 211 and 221 and between the clamp pieces 212 and 222.
[0015]
An engagement piece 217 is formed on the rear end side of the upper clamper 201. The engaging piece 217 includes an inclined portion 217a extending obliquely downward, and a horizontal portion 217b extending horizontally from the inclined portion 217a. A threaded shaft 219 is provided at the end of the horizontal portion 217 b of the engagement piece 217. The threaded shaft 219 is turnable in the vertical direction. A knob 218 is provided on the screw 219 a of the threaded shaft 219.
[0016]
A loop piece 227 is formed on the rear end side of the lower clamper 202. The loop piece 227 includes a bifurcated inclined portion 227a extending obliquely upward, and a horizontal portion 227b that connects the inclined portion 227a. A notch 227c with which a threaded shaft 219 can be engaged is formed at the end of the horizontal portion 227b of the loop piece 227. The engagement piece 217 of the upper clamper 201 enters the loop piece 227.
[0017]
Next, the usage method of this elbow clamp is demonstrated.
Even when this elbow clamp is used, the resin pipes are inserted into both sides of the EF joint. In the elbow clamp, the knob 218 is turned to turn the threaded shaft 219 downward so that the horizontal portion 217b on the rear end side of the upper clamper 201 and the horizontal portion 227b on the rear end side of the lower clamper 202 are not in contact with each other. At this time, as shown in FIG. 7, the upper clamper 201 and the lower clamper 202 are relatively rotatable about the pivot 205 as a fulcrum by the urging force of the spring 207.
[0018]
First, the lower clamper 202 of the elbow clamp is inserted from the inside of the EF joint in the horizontal direction. Next, the upper clamper 201 is rotated to sandwich the resin pipe between the clamp pieces 211 and 221 and between the clamp pieces 212 and 222. At this time, the upper surface of the horizontal portion 217 b of the engagement piece 217 of the upper clamper 201 is in contact with the lower surface of the horizontal portion 227 b of the loop piece 227 of the lower clamper 202. In this state, the threaded shaft 219 is swung upward to engage the threaded shaft 219 with the notch 227c of the loop piece 227, and then the knob 218 is turned to tighten. Accordingly, the upper and lower clampers 201 and 202 are fixed on the rear end side, so that the pipe is clamped between the upper and lower clampers 201 and 202.
[0019]
However, the elbow clamp of this example also has an extra space for inserting the elbow clamp from the side at the corner and bottom of the excavation groove for pipe placement, similarly to the elbow clamp shown in FIGS. Must be taken. In particular, in such an elbow clamp, the end of each clamp piece has a bowl shape (semi-circular shape), so that it is necessary to take a wider construction space at the groove bottom. For this reason, when the ground cannot be dug deep due to the situation at the site, it may be assumed that the pipe cannot be clamped. Furthermore, in this elbow clamp, since the upper and lower clampers 201 and 202 are respectively integrated, the clamp diameter of the clamp piece and the clamp arm length cannot be made variable. For this reason, it cannot respond appropriately to pipes and elbows of different sizes.
[0020]
The present invention has been made in view of these problems, and it is an object of the present invention to provide an elbow clamp that does not require a wide construction space during use, or that can cope with a special form of connection. .
[0021]
[Means for Solving the Problems]
In order to solve the above problems, the present invention Base The elbow clamp of the first aspect is an elbow clamp used when two resin pipes are connected and fixed via an elbow fusion joint; two sets of clamp mechanisms sandwiching the outer peripheral surface of each pipe; and the clamp mechanism And a coupling mechanism that couples to each other, and is attached from a direction substantially perpendicular to a plane formed by a flow path core of the elbow fusion joint.
[0022]
When pulling pipes extending substantially horizontally into the ground, the elbow clamp can be attached from above the pipe and elbow fusion joint in the excavation groove. Therefore, it is not necessary to take an extra space for inserting the elbow clamp from the side, so that the construction time and cost can be reduced. Furthermore, construction work can be realized even in places where pipes of various shapes are complicated and complicated.
[0023]
In the elbow clamp according to the first aspect of the present invention, the clamp mechanism may move in a direction along the plane to sandwich the pipe.
In this case, clamping can be performed without inserting a clamping mechanism between the pipe and the bottom of the excavation groove. Therefore, it is not necessary to dig an excessively wide excavation groove.
[0024]
In the elbow clamp according to the first aspect of the present invention, the length of the coupling mechanism may be variable.
In this case, various pipe sizes and elbow sizes can be accommodated.
[0025]
The present invention is connected with The elbow clamp according to the second aspect of the present invention is an elbow clamp used when two resin pipes are connected and fixed via an elbow fusion joint; two sets of clamp mechanisms sandwiching the outer peripheral surface of each pipe; and the clamp mechanism And a plurality of standards for the pipe in the mechanism for adjusting the opening of the pair of clamp pieces. A press feed mechanism and an idle feed mechanism corresponding to the dimensions may be provided.
As an example of such a clamping mechanism, it has a feed screw that changes the mutual distance between the pair of clamp pieces, and a plurality of threaded portions and a screw removal portion between them are formed on the feed screw. Things can be mentioned. When clamping pipes of different sizes, the feeding time and labor can be shortened by using an idle feeding mechanism.
[0026]
The present invention is connected with The elbow clamp of the third aspect is an elbow clamp that is used when two resin pipes are connected and fixed via an elbow fusion joint; each resin pipe outer peripheral surface is connected to the flow path core of the elbow fusion joint. A pair of clamp mechanisms that move and sandwich in a direction along a plane to be formed; and a coupling mechanism having a coupling shaft that couples the clamping mechanisms to each other, wherein the clamping mechanism sandwiches the pipe outer shape The clamp piece comprises a fixed clamp piece fixed to the end of the connecting shaft, and a movable clamp piece connected to the fixed clamp piece via a feed screw, Further, an anti-sway guide that is disposed at a position that forms an angle with respect to the axis of the connecting shaft and that can be extended and contracted by the feed screw is provided between the fixed and moving clamp pieces. It is characterized by being.
[0027]
When pipe clamping is performed, an elbow clamp is attached from above the pipe arranged in the excavation groove, and the pipe is positioned between the clamp pieces. Next, the feed screw is turned to move the moving side clamp piece, and the pipe is clamped by both clamp pieces. During the movement of the moving side clamp piece, the steadying guide is expanded and contracted following the feed operation of the feed screw, thereby preventing the moving side clamp piece from shaking.
[0028]
In the elbow clamp of the present invention, one of the fixed-side clamp pieces is movable along the axis of the connecting shaft, and the movable fixed-side clamp piece is positioned on the connecting shaft. A plurality of positioning points may be provided.
By moving the fixed clamp piece, various pipe sizes and elbow sizes can be accommodated. When the fixed-side clamp piece is positioned at each positioning point, the fixed-side clamp piece does not move and can be reliably clamped.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a plan view showing a pipe clamp state of an elbow clamp according to one embodiment of the present invention.
2A and 2B are cross-sectional side views showing a pipe clamp state of the elbow clamp, and FIG. 2C is an enlarged view of the male screw shaft.
FIG. 3 is a partial front view of the periphery of the connecting shaft of the elbow clamp as seen from the direction of arrow III in FIG.
[0030]
FIG. 1 shows two resin pipes 5 orthogonal to each other and an elbow fusion joint 3 between the resin pipes. End portions 5 c of the two resin pipes 5 are inserted into the elbow fusion joint 3.
[0031]
The resin pipes 5 are fixed to each other by the elbow clamp 10 of this embodiment. The elbow clamp 10 includes a pair of clamp mechanisms 13 and 14. The clamp mechanisms 13 and 14 are connected to each other by the connecting shaft 12 of the connecting portion 11. As shown in FIGS. 1 and 3, a vertical end surface 12 </ b> A is formed on the side of the outer peripheral surface of one end of the connecting shaft 12 (lower right portion in FIG. 1, left end portion in FIG. 3). As shown in FIG. 1, a plurality of positioning holes 12B are formed in the upper portion of the vertical end surface 12A. The operation of the vertical end surface 12A and the positioning hole 12B will be described in detail later. A flange portion 12 </ b> D is formed at the one end portion of the connecting shaft 12.
[0032]
Next, the clamp mechanisms 13 and 14 will be described with reference mainly to FIG. First, the same components in the pair of clamp mechanisms 13 and 14 will be described together.
As shown in FIGS. 1 and 2, the clamp mechanisms 13 and 14 include a pair of clamp pieces 23 and 25 that sandwich the outer shape of the resin pipe 5. One of the clamp pieces is a fixed side clamp piece 23 fixed to the end of the connecting shaft 12, and the other of the clamp pieces is a moving side clamp connected to the fixed side clamp piece 23 via the opening adjustment mechanism 40. It is a piece 25. Both clamp pieces 23 and 25 hang downward from the connecting portion 11. V-shaped punching portions 23 </ b> A and 25 </ b> A are formed on the inner surfaces near the lower ends of the clamp pieces 23 and 25. At the time of pipe clamping, these punched portions 23A and 25A hit the outer peripheral surface of the resin pipe 5.
[0033]
The opening adjustment mechanism 40 between the clamp pieces 23 and 25 is a mechanism that adjusts the opening (distance) by moving the moving-side clamp piece 25. As shown in FIG. 1, the opening adjustment mechanism 40 is disposed at a position that is open outward at an angle of 45 ° with respect to the axis of the connecting shaft 12.
[0034]
The opening adjustment mechanism 40 includes a feed screw 41. As shown in FIG. 2, the feed screw 41 includes a female screw sleeve 43 and a male screw shaft 45. One end of the female screw sleeve 43 (the right end in FIGS. 2A and 2B) is fixed to the fixed clamp piece 23 by a pin or the like. A female screw 43a is cut on the inner peripheral surface of the other end of the female screw sleeve 43 (the left end in FIGS. 2A and 2B).
[0035]
As best shown in FIG. 2C, the male screw shaft 45 has screw removal portions (straight portions) 45a, 45b, and 45c, and two threaded portions 45d and 45e therebetween. Further, a flange portion 45f is formed at the right end of the male screw shaft 45 (the right end in FIG. 2). The screws of the threaded portions 45 d and 45 e of the male screw shaft 45 are screwed with the female screw 43 a of the female screw sleeve 43. The flange portion 45f hits the end surface of the female screw 43a of the female screw sleeve 43 in a state where both the clamp pieces 23 and 25 are most opened, and prevents the male screw shaft 45 from coming off. The flange portion 45 f is slidably inserted into the female screw sleeve 43.
[0036]
Both the threaded portions of the male screw shaft 45 and the female screw sleeve 43 are screwed together. However, the screw removal portions 45a and 45b of the male screw shaft 45 move smoothly in the female screw sleeve 43. The left end of the male screw shaft 45 (the left end in FIGS. 2A and 2B) penetrates the hole 25C of the moving side clamp piece 25 and projects outward. A knob 47 is fixed to the protruding end. The protruding end of the moving side clamp piece 25 and the knob 47 are integrally coupled by a split pin 38. Therefore, the knob 47 and the male screw shaft 45 rotate together.
[0037]
A spring 49 is fitted on the feed screw 41. The right end of the spring 49 is in contact with the inner surface of the fixed-side clamp piece 23. The left end of the spring 49 is engaged in the counterbore 25 </ b> B of the moving-side clamp piece 25. By this spring 49, the fixed side clamp piece 23 and the moving side clamp piece 25 are urged to the side away from each other. In response to this urging force, the moving-side clamp piece 25 moves following the operation of the knob 47.
[0038]
An anti-sway guide 50 is disposed above the feed screw 41 between the fixed side clamp piece 23 and the moving side clamp piece 45. The steady rest guide 50 includes a guide sleeve 53 and a guide shaft 55. The guide sleeve 53 is fixed to the fixed-side clamp piece 23 with a pin or the like. The right end of the guide shaft 55 is slidably inserted in the guide sleeve 53. The left end of the guide shaft 55 is fixed to the moving side clamp piece 25 by a pin or the like. The steady rest guide 50 can be expanded and contracted by following the feed screw 41.
[0039]
Next, differences in configuration between the pair of clamp mechanisms 13 and 14 described above will be described mainly with reference to FIG.
These clamp mechanisms 13 and 14 are different from each other in that the fixed clamp piece 23 of the clamp mechanism 13 (upper side in FIG. 1) is fixed to the connecting shaft 12 so as not to move, whereas the clamp mechanism 14 (lower side in FIG. 1). That is, the fixed side clamp piece 23 'of the side) is movable.
[0040]
A through-hole 23a is formed in the fixed clamp piece 23 on the right side of FIG. The right end portion of the connecting shaft 12 is inserted into the through hole 23a. The fixed side clamp piece 23 and the right end portion of the connecting shaft 12 are fixed by screws 37. Thereby, the fixed side clamp piece 23 is fixed so as not to move.
[0041]
A through hole 23a 'is also formed in the fixed clamp piece 23' on the left side of FIG. The left end portion of the connecting shaft 12 is inserted into the through hole 23a ′. A vertical screw 34 and a horizontal screw 35 are provided at the upper end of the fixed clamp piece 23 '. The vertical screw 34 is screwed into a screw hole (not shown) between the upper end surface of the fixed-side clamp piece 23 ′ and the through hole 23 a ′. The lower end portion of the vertical screw 34 projects into the through hole 23a ′ and engages with the positioning hole 12B (see FIG. 1) of the connecting shaft 12. A knob 34 is provided at the upper end of the vertical screw 34. By rotating the knob 34 and tightening the vertical screw 34, the fixed-side clamp piece 23 'is positioned so as not to move.
[0042]
The horizontal screw 35 is screwed into a screw hole (not shown) between the through holes 23a ′ on the side surface of the fixed-side clamp piece 23 ′. The horizontal screw 35 protrudes into the through hole 23 a ′ and contacts the vertical end surface 12 </ b> A of the connecting shaft 12. When the end portion of the horizontal screw 35 is in contact with the vertical end surface 12A, rotation blur of the fixed-side clamp piece 23 'is prevented.
Next, how to prevent the fixed side clamp piece 23 'from coming off from the connecting shaft 12 will be described. As described above, the flange portion 12 </ b> D is formed at the end of the connecting shaft 12. When the fixed-side clamp piece 23 ′ moves to the leftmost side in FIG. 3, the flange 12D of the connecting shaft 12 hits the left end edge 23x of the through hole 23a ′ of the fixed-side clamp piece 23 ′. As a result, it is prevented from coming off.
[0043]
Next, an overall method of using the elbow clamp of this embodiment will be described together.
First, at a piping site, as shown in FIG. 1, two resin pipes 5 orthogonal to each other and an elbow fusion joint 3 between these resin pipes are arranged in a piping groove (not shown). At this time, the end portions 5 c of the two resin pipes 5 are inserted into the elbow fusion joint 3.
[0044]
On the other hand, in the elbow clamp, the knobs 47 of both the clamp mechanisms 13 and 14 are operated to appropriately open the distance between the fixed clamp piece 23 and the movable clamp piece 25. When the clamp mechanisms 13 and 14 are opened (when the distance between the clamp pieces 23 and 25 is increased), the movable clamp 25 is moved to the knob 47 by receiving the biasing force of the spring 49. In the movable clamp mechanism 14, the vertical screw 34 is loosened so that the fixed clamp piece 23 ′ can move on the connecting shaft 12. Or, if you continue to build elbows of the same size, leave them in their previous positions.
[0045]
Next, the fixed clamp piece 23 'of the clamp mechanism 14 is moved according to the size of the elbow fusion joint 3, an appropriate positioning hole 12B is selected according to the size of the elbow fusion joint 3, and the knob 34A is turned. Tighten the vertical screw 34. Thereby, the end of the vertical screw 34 is engaged with the selected positioning hole 12B, and the fixed-side clamp piece 23 'of the clamp mechanism 14 is positioned so as not to move. At this time, the end of the horizontal screw 35 is in contact with the vertical end surface 12 </ b> A of the connecting shaft 12, thereby preventing the fixed-side clamp piece 23 ′ from shaking. Such adjustment of the clamp mechanism 14 is performed on the ground or the like before the pipe is clamped by the elbow clamp.
Thereafter, as shown in FIG. 1, the elbow clamp is attached to the resin pipe 5 disposed in the excavation groove from above so that the pipe 5 is sandwiched between the clamp pieces 23 and 25.
[0046]
Next, the knob 47 of the opening adjustment mechanism 40 is turned to feed the feed screw 41, and the resin pipe 5 is firmly clamped between the clamp pieces 23 and 25. At this time, the female screw 43a of the female screw sleeve 43 and the threaded portion 45d of the male screw shaft 45 are screwed into a large-diameter resin pipe as shown in FIG. On the other hand, for a small-diameter resin pipe as shown in FIG. 2B, the female thread 43a of the female screw sleeve 43 and the threaded portion 45e of the male screw shaft 45 are screwed together. In any case, when the screw removing portions 45a, 45b, and 45c pass through the female screw 43a, it is only necessary to push and pull the knob 47, and the labor and time for screwing can be saved.
[0047]
At the time of screw feeding, the steady rest guide 50 is moved while expanding and contracting along with the feeding operation of the feed screw 41. Specifically, the guide shaft 45 advances while sliding in the guide sleeve 43 with respect to a large-diameter resin pipe as shown in FIG. On the contrary, the guide shaft 45 enters the guide sleeve 43 while sliding into the small-diameter resin pipe as shown in FIG. In either case, the steady-state guide 50 prevents the moving-side clamp piece 23 from moving during the feed operation of the feed screw 41.
[0048]
Thus, in the elbow clamp 10 of the present embodiment, since the elbow clamp 10 can be attached from the upper side of the pipe, it is not necessary to take extra construction space in the corner portion and groove bottom portion of the excavation groove. Therefore, construction time and cost can be reduced. Furthermore, construction work can be realized even in a case where a large space cannot be secured between the excavation groove surface, for example, connection between a pre-emption service team and an elbow fusion joint. In addition, with a conventional clamper, it is possible to clamp even a special connection that interferes with a resin pipe / joint.
[0049]
Although one embodiment of the present invention has been described above, various improvements / additions such as the following can be made.
(1) The steady rest guide 50 can be constituted by a square pipe-shaped member, a key, a flat or the like.
(2) In the above-described embodiment, the knob 47 is attached to the outside of the movable clamp piece 25. However, the opening adjustment mechanism 40 is rotated 180 ° in FIGS. 2 (A) and 2 (B). The knob 47 may be attached to the fixed clamp piece 23 side.
(3) In the above-described embodiment, the resin pipe 5 is clamped between the clamp pieces 23 and 25 by turning the knob 47 and feeding the feed screw 41. However, in addition to the mechanism for turning the feed screw 41, A cam may be used. Or it can also be set as the mechanism which presses the clamp pieces 23 and 25 to the resin pipe 5 using elastic members, such as a spring or rubber | gum.
[0050]
【The invention's effect】
As is clear from the above description, according to the elbow clamp of the present invention, it is not necessary to take a wide construction space during use. In addition, special forms of connections can be accommodated.
When the clamp mechanism is configured to move in the direction along the plane formed by the flow path core of the elbow fusion joint to sandwich the pipe, the clamp mechanism can be clamped without inserting the clamp mechanism between the pipe and the bottom of the excavation groove. Therefore, it is not necessary to dig an excessively wide excavation groove.
When the length of the coupling mechanism is made variable, various pipe sizes and elbow sizes can be accommodated.
If a mechanism that adjusts the opening of a pair of clamp pieces is equipped with a press feed mechanism and an idle feed mechanism that correspond to the standard dimensions of the pipe, the feeding time and labor are reduced when clamping pipes of different sizes. it can.
[Brief description of the drawings]
FIG. 1 is a plan view showing a pipe clamp state of an elbow clamp according to one embodiment of the present invention.
2A and 2B are cross-sectional side views showing a pipe clamp state of the elbow clamp, and FIG. 2C is an enlarged view of a male screw shaft.
FIG. 3 is a partial front view of the elbow clamp around a connecting shaft as seen from the direction of arrow III in FIG. 1;
FIG. 4 is an enlarged side view showing details of a clamper of a conventional elbow clamp.
5 is a plan view showing the overall configuration and usage method of the elbow clamp in FIG. 4;
6A and 6B are diagrams showing a closed state (pipe clamp state) of another example of a conventional elbow clamp, where FIG. 6A is a perspective view and FIG. 6B is a partial cross-sectional side view.
7A and 7B are views showing an open state (clamp release state) of the elbow clamp of FIG. 6, wherein FIG. 7A is a perspective view, and FIG. 7B is a partial cross-sectional side view.
[Explanation of symbols]
3 Elbow fusion joint 5 Resin pipe
10 Elbow clamp
11 Connecting part 12 Connecting shaft
12A Vertical end face 12B Positioning hole
13, 14 Clamp mechanism
23 (23 ') Fixed clamp piece
25 Moving side clamp
34 Vertical screw 35 Horizontal screw
40 Opening adjustment mechanism
41 Lead screw
43 Female thread sleeve 45 Male thread shaft
43a Female thread
45a, 45b, 45c Screw removal part
45d, 45e threaded part
45f Flange
47 Knob 49 Spring
50 steady rest guide
53 Guide sleeve 55 Guide shaft

Claims (5)

An elbow clamp used for connecting and fixing two resin pipes via an elbow fusion joint;
Two sets of clamping mechanisms sandwiching the outer peripheral surface of each pipe;
A coupling mechanism for coupling the clamp mechanisms to each other;
The clamp mechanism is configured to move in a direction along a plane formed by a flow axis of the elbow fusion joint so as to sandwich the pipe, and can be attached from a direction substantially perpendicular to the plane. with it is configured to,
The clamp mechanism has a pair of clamp pieces that move in the direction along the plane and sandwich the outer shape of the pipe, and an angling portion that contacts the outer peripheral surface of the pipe is formed on the inner surface near the lower end of the clamp piece. Elbow clamp characterized by that. During mechanism for adjusting the opening of the pair of clamping pieces, elbow clamp according to claim 1, wherein the the pressing feed mechanism and air feeding mechanism corresponding to a plurality of standard dimensions of the pipe are provided. The clamp mechanism has a feed screw for changing a distance between the pair of clamp pieces;
The elbow clamp according to claim 2 , wherein the lead screw is formed with a plurality of threaded portions and a screw removal portion therebetween. The clamp piece is composed of a fixed-side clamp piece fixed to the end of the connecting shaft, and a moving-side clamp piece connected to the fixed-side clamp piece via a feed screw,
The feed screw is disposed at a position that forms an angle with respect to the axis of the connecting shaft;
The elbow clamp according to any one of claims 1 to 3 , further comprising an anti-sway guide that can be extended and contracted by being driven by the feed screw between the fixed and moving side clamp pieces. One of the fixed side clamp pieces is movable along the axis of the connecting shaft,
The elbow clamp according to claim 4 , wherein a plurality of positioning points for positioning the movable fixed clamp piece are provided on the connecting shaft.

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