JPH0533268Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is a method for connecting two pipes constituting water and sewer piping by pushing the other end into a socket, or This product relates to a pipe connection and extraction tool that is used to pull out and disconnect two pipes connected to each other.

<Prior art> The present applicant has published Utility Model Application No. 59-195279 and Utility Model Application No. 62
-According to Publication No. 172570, each end of two pipes to be connected is tightened with a tightening tool consisting of two approximately semicircular holding members, and by pulling the respective tightening tools toward each other, the socket of one of the pipes is tightened. We proposed a push-in connection tool for pipes that connects by pushing the other end of the pipe into the pipe. The tool described in the above-mentioned Japanese Utility Model Application No. 59-195279 uses fluid pressure to pull together both fasteners using an opening/closing operation tool consisting of a piston cylinder.
In the tool described in Japanese Patent No. 172570, the opening/closing operation tool is a series of screw shafts having a left-hand thread and a right-hand thread, and the screw shaft is rotated to pull both fasteners together.

<Problem to be solved by the invention> Although two pipes can be effectively connected using the two preceding tools, it is not possible to disconnect the two connected pipes by pulling them out.

<Means for solving the problem> Therefore, the present invention was developed with the aim of being able to connect two pipes by pushing their ends together, or to disconnect them by pulling out the two connected pipes. The upper ends of the front and hind legs are swingably pivoted and have a pair of bifurcated pieces that straddle one of the two tubes as a pipe connection and extraction tool, and the front and hind legs can be opened and closed. The legs are connected to each other so that they can be opened and closed using a tool, and the lower ends of each of the forked pieces of the front leg and the rear leg are provided with a cutout groove that is open at the lower end. In order to enable pipes of various diameters to be used by straddling the forked pieces of the front and rear legs, the pipe connecting and extracting tool according to claim 2 is provided with a tube on both sides of the front leg and the rear leg, respectively. It is characterized in that a screw rod is provided that projects outward from the screw rod, and each bifurcated piece of the pair is fixed to the screw rod with a nut.

<Example> In each illustrated example, 1 is a front leg, 2 is a pair of bifurcated pieces extending downward from the front leg, 3 is a hind leg, 4 is a pair of bifurcated pieces extending downward from the hind leg, and 5 is a front leg and a rear leg. An opening/closing operation tool that connects the legs and opens the legs 1 and 3 by separating them, or closes them by bringing them closer together, and 6 indicates each bifurcated piece 2, 2
and 4, showing a notch groove opened at the lower end provided at the lower end of 4. The front legs 1 and the rear legs 3 are each made of a groove-shaped steel material, and the upper ends thereof may be overlapped like a compass and pivoted by a single pivot, but in each of the illustrated embodiments, they are made of groove-shaped steel members with an open bottom surface. The front legs 1 and the rear legs 3 are inserted into each of the front and rear ends of the base plate 7 and are individually pivoted by a pivot 8, and the semicircular edges of each upper end are provided with teeth 9 that mesh with each other, so that the front legs 1 and the rear legs 3 are aligned at the same angle. It is designed to open and close.

Two threaded rods 10, 10 projecting outward from both sides are fixed at the top and bottom to both side pieces 1', 1' and 3', 3' of each leg 1 and 3 in order to fix the bifurcated pieces.

Each pair of bifurcated pieces 2 and 4 consists of two iron flat bars bent into a dogleg shape.
The upper half along the outer surface of 1', 3', and 3' is 2 above.
It has a hole for passing the screw rod 10, 10 for the book,
This hole is fitted into the screw rods 10, 10 and fixed with nuts 11, and the lower half portion having the notch groove 6 at the lower end projects downward from the lower end of each leg. There are several types of PVC pipes for upper and sewer pipes, ranging in outer diameter from about 75 mm to about 300 mm. For example, connecting a 75mm pipe,
When pulling out, tighten each pair of bifurcated pieces 2 and 4 to the outer surface of each side piece of the front leg and hind leg with nuts 11, and when connecting or pulling out a 200 mm pipe, Fixing position of each pair of bifurcated pieces with screw rod 1
0 and secure it by sandwiching it between two nuts 11 (broken lines in Figure 2). This allows fork pieces 2 and 4 to
The spacing between the pairs of tubes can be adjusted to correspond to the outer diameter of tubes of various sizes within the range of 75 to 300 mm.

The embodiment shown in FIGS. 1 and 2 is an example in which the opening/closing operation tool 5 is a turnbuckle-type threaded shaft 12 having a right-hand thread and a left-hand thread at half of its total length.

Therefore, as in the above-mentioned publication of Utility Model Application No. 62-172570, each side piece 1' of the front leg 1 and the rear leg 3,
A right-handed threaded nut 13 and a left-handed threaded nut 14 are installed between the lower ends of 1', 3', and 3' so as to be rotatable about an axis parallel to the pivot 8, and a right-handed threaded nut 14 is attached to the right-handed threaded nut 14 of the screw shaft 12. At step 13, the left-hand threaded portion is screwed into the nut 14 of the left-hand threaded portion, and a tool such as a ratchet-operated box spanner is fitted onto the head 12' of the screw shaft 12 so that it can be rotated in forward and reverse directions.

To connect or pull out pipes, connect two pipes A and B.
A clamping tool 30 for tightening the pipe from the circumference is attached to each end to be connected or pulled out. Each of the tightening tools 30 connects one end of two semicircular pressure members 31, 31 with each other with a hinge 32, opens both pressure members with the hinge 32 to wrap the tube, and has a protruding piece at each other end. 33 are facing each other, and the screw 34 is passed through both protruding pieces 33, 33.
Both protruding pieces 33, 33 are tightened between the nut 35 screwed in and the head of the screw, thereby tightening the pipe from the circumference with the holding members 31, 31. If there are multiple types of PVC pipes to be connected or pulled out, from small diameters to large diameters, a tool is prepared that tightens the PVC pipes of each outer diameter from around the circumference, and one is selected and used according to the pipe diameter.

Then, a headed pin 37 is fixed to the pressure holding members 31, 31 of each fastener by welding or the like so as to face outward at a phase of 90° from the hinge 32.

To make the connection, place the ends of the two tubes A and B so that they are close to each other and concentric, and straddle each tube with the pair of bifurcated pieces 2 and 4 on the front and back legs, and connect the ends of each tube. Fit the notch groove 6 from above into the shaft of the headed pin 37 protruding from both sides of the fastener 30 fixed to the
By turning the screw shaft 12 in one direction, the front leg 1 and the pair of bifurcated pieces 2 and the rear leg 3 and the pair of bifurcated pieces 4 are brought closer to each other, and the tube end of the B of the other tube is inserted into the socket of one tube A. Push in to connect.

When connecting, please note that the inner periphery of the socket of pipe A and the socket of pipe B
An adhesive or a lubricant may be applied to the outer periphery of the tube end.

When the connection work is thus completed, the tool is pulled up, the notched groove 6 is removed from the shaft of the headed pin of the fastener, and each fastener 30 is then removed from its respective pipe.

In addition, in order to pull out the connected tubes, a tightening tool 30 was similarly attached to each end of the two connected tubes A and B, and the distance between the lower ends of the forked pieces of each pair of front legs and rear legs was fixed. Fit the two fasteners 30, 30, straddle each pipe with each pair of bifurcated pieces, fit the notch groove 6 at the lower end into the shaft of the headed pin 37 on both sides of each fastener, and then screw the threaded shaft 12. Turn the front leg 1 in the opposite direction.
and separate the pair of bifurcated pieces 2, the hind legs 3 and the pair of bifurcated pieces 4 away from each other, thereby opening the tubes A and B.
Apply a pulling force to it and pull it out. When the extraction operation is completed, the tool is pulled up to remove the notched groove 6 from the headed pin of the fastener, and then each fastener 30 is removed from its respective tube.

That is, since the bifurcated pieces 2 and 4 of the pair of front and rear legs have cutout grooves 6 open at the lower ends, the tubes can be connected by swinging the front and rear legs in the closing direction and bringing them closer to each other. By swinging them in the opening direction and separating them from each other, the connected tubes can be pulled out and disconnected.

The second embodiment shown in FIG. 5 is almost the same as the first embodiment described above, but differs in that the opening/closing operating tool 5 uses a one-sided threaded shaft 15 having only one direction, for example, a right-hand thread. . Therefore, instead of the left-hand threaded nut 14 attached to the front leg or rear leg in the first embodiment,
A member 1 having a hole through which the screw shaft 15 is rotatably passed.
6 is similarly attached so as to be rotatable about an axis parallel to the pivot 8, and the screw shaft 15 is screwed only into the right-hand threaded nut 13 attached to the other leg, and the threaded shaft 15 is screwed into the nut 13 with a right-hand thread attached to the other leg, and the threaded shaft 15 is attached to the front and back of the part passing through the hole in the member 16. By attaching a split pin 17 or the like through the screw shaft, the screw shaft is prevented from moving in the axial direction.

The tool of this second embodiment also functions in the same way as the tool of the first embodiment described above. However, in this embodiment, the speed at which the front legs 1 and the rear legs 3 open and close is slower than in the first embodiment, but the force for turning the screw shaft is reduced accordingly.

The tool of the embodiment shown in FIG.
The difference lies in the use of a small piston cylinder 18 that is pneumatically actuated by, for example, compressed air. For this purpose, connect the end of the piston rod 19 to the front leg (or rear leg).
The cylinder 2 is pivotally connected between the lower ends of both sides 1' and 1'
The head end of cylinder 0 is pivoted between the lower ends of both sides 3' and 3' of the other leg, and compressed air is introduced into the head end of the cylinder to push out the piston rod, thereby opening both legs 1 and 3, and compressing Switch the air and introduce it into the rod end of the cylinder, retract the piston rod,
This closes both legs 1 and 3.

Therefore, in this embodiment, the pipes can be connected and pulled out by fluid pressure operation, and the trouble of turning the screw shafts 12 and 15 can be saved.

In addition to PVC pipes with standard diameters, the pipes to be connected include concrete hume pipes, ceramic pipes (clay pipes), etc. with various outside diameters, and the tightening tool 30 is prepared according to the outside diameter of each pipe. It is complicated to do.

Therefore, in each of the illustrated embodiments, a plurality of screw holes 21 are provided in the vertical direction in the lower half of each bifurcated piece of each pair of front legs and rear legs, and bolts 22 can be attached to these screw holes 21. There is. Therefore, as shown in Fig. 7, a wire W is wound around each end of the two pipes A and B to be connected, and a hook F attached to one end of the wire is connected to a loop L at the other end of the wire. This hook F is hooked to the bolt 22 installed in the screw hole 21 of the pair of forked pieces of the front leg and the rear leg that straddle each tube, and both the front and rear legs of the tool and the pair of the forked pieces are attached to the screw shaft 12, The two pipes A and B can be similarly connected by bringing them close together using a piston cylinder 15 or a piston cylinder 18 and pulling them with their respective wires.

If the diameter of the pipes A and B to be connected is small, install the bolt 22 in the lower threaded hole 21, and if the diameter is large, install the bolt 22 in the upper threaded hole 21, thereby making each pair bifurcated. When the lower end of the piece touches the ground or the bottom of a trench dug in the ground for burying the pipe, it is preferable that the position or level of the bolt 22 be right next to the pipe as shown, that is, at the center height. .

Further, if a handle 23 is provided on the board 7, it will be easier to handle when working or carrying it.

Furthermore, the base plate 7 is required when the front and rear legs each having a pair of bifurcated pieces are individually pivoted, but as shown in the embodiment of FIG. 8, the board 7 is not necessarily required.

<Effects of the Invention> According to the present invention, it is possible to provide a tool that can be used not only to push two pipes together to connect them, but also to pull out two connected pipes to disconnect them.

Also, even if the diameter of the pipe to be connected or disconnected differs each time, the pipe can be adjusted by changing the position where the bifurcated piece is fixed with a nut to the screw rod protruding from each side of the front and rear legs. It can be used easily to accommodate different diameters.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the first embodiment of the tool of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is an explanatory diagram of a state in which a pipe is connected or pulled out. , FIG. 4 is a front view of the fastener, FIG. 5 is a partially cutaway front view of a second embodiment of the tool of the present invention, and FIG. 6 is a front view of another embodiment of the tool of the present invention. , FIG. 7 is an explanatory diagram of a state in which pipes are connected using a wire rope with the tool of each embodiment. In the figure, 1 is the front leg, 2 is its bifurcated leg, 3 is the hind leg,
4 is a rear leg, 5 is an opening/closing operation tool, and 6 is a notch groove.

Claims (1)

[Claims for Utility Model Registration] (1) The upper ends of the front and rear legs are swingably pivoted and have a pair of bifurcated pieces spanning one of the two tubes, and the front and rear legs can be opened and closed. A pipe connecting and extracting tool, which is connected so as to be openable and closable with an operating tool, and has a cutout groove opened at the lower end of each of the forked parts of the front leg and the rear leg. (2) In the pipe connecting and extracting tool according to claim 1, the front leg and the rear leg are each provided with a screw rod protruding outward from both sides, and each bifurcated piece of the pair is provided with a nut to the screw rod. A pipe connecting and extracting tool, characterized in that it is fixed with a pipe.