JPH0243616Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a pair of guide rings for pipe cutting blades suitable for cutting underground pipes such as gas pipes and water pipes while they are still buried. A special tool that is fixed to the pipe across the planned cutting line to form a circumferential groove into which the cutting blade fits, and that only produces a guiding action to cut the cutting blade without removing it from the planned cutting line. This is related.

(Prior art) There are techniques for cutting underground pipes while they are buried, replacing a part of the defective buried pipe, or replacing it with a new pipe fitted with a branching saddle in advance. Research has been carried out by water supply suppliers, and it is now possible to do so in the near future, but in order to cut the pipe while it is buried, it is necessary to use a hand-held pipe cutter that can be brought into the work hole drilled from the ground surface by one person. Its use is also most advantageous in simplifying cutting work. However, if the pipe cutter is handheld, it is likely to deviate from the intended cutting line of the buried pipe and cause the cut to occur diagonally. A special tool for fitting it into the groove and guiding it perpendicular to the center line of the pipe has not yet been developed.

(Problems to be solved by the invention) The invention makes it easy to install and remove buried pipes when cutting pipes, which in most cases requires one person to work in a narrow hole dug from the ground surface. Development of a tool in which a circumferential groove indicating a planned cutting line is constructed by fitting and fixing a pair of rings, and furthermore, a cutting tool can be fitted into the circumferential groove to guide cutting without causing runout. This is an issue to be addressed.

(Means for Solving the Problems) The purpose of the pair of rings dedicated to guides of the pipe cutting blade of the present invention is to solve the problems mentioned in the previous section. A pair of ring-shaped guide pieces that are fitted on both sides and constitute a circumferential groove k into which a cutting blade d is fitted is made up of several arcuate pieces 5, and both ends of the arcuate pieces 5 at a plurality of locations in the circular direction are free to bend. While providing a plurality of joints 10,
A connection in which an opening 13 that fits into a pipe P is provided at one location, protrusions 2a and 5a are provided on corresponding sides of the opening 13 to bring them closer to each other, and a nut 19 is screwed into one of the protrusions 2a and 5a. The rod 14 is the axis 17
It is characterized by being pivotally supported by the other end and having a cut-in groove 18 into which the connecting rod 14 is fitted.

(Function) The present invention consists of a pair of ring-shaped guide pieces to be fitted on both sides of the planned cutting line of the pipe P to be cut, and several circular arc pieces 5.
A plurality of joints 10 are provided in which both ends of the arcuate piece 5 are freely bent at a plurality of locations in the circular direction, and an opening/closing opening 13 to be fitted into the pipe P is provided at one location, and on both sides corresponding to the opening/closing opening 13. Protrusions 2a and 5a are provided that are brought closer to each other, and the protrusions 2a and 5a are provided.
A connecting rod 14 with a nut 19 screwed onto one side of the connecting rod 5a is supported by a shaft 17, and a slot 8 into which the connecting rod 14 is fitted is provided on the other side, so that the pipe P to be cut can be easily attached even in a narrow space. It can be fixed by fitting it into the
In addition, by fitting the pair into the pipe to be cut with a slight interval, both ring guide pieces 1 and 1 can be cut.
Not only can a circumferential groove k clearly displaying the planned cutting line between the pipes be formed, but also a blade for cutting the pipe can be fitted into the circumferential groove k and guided so as not to deviate from the planned cutting line.

(Effects) The pair of rings dedicated to the pipe cutting blade of the present invention has the above-mentioned effect, and the ring-shaped guide pieces 1 are fitted on both sides of the planned cutting line of the pipe P to be cut to form the circumferential groove k into which the cutting blade d is fitted. A pair is composed of several arcuate pieces 5, and a plurality of joints 10 are provided to allow free bending of both ends of the arcuate pieces 5 at a plurality of locations in the middle circle direction, and an opening/closing opening 13 to be fitted into a pipe P is provided at one location. Because of this, it is easy to fit into the pipe to be cut and carry it, and the protrusions 2a and 5a are provided on corresponding sides of the opening/closing opening 13 to bring them closer to each other, and one of the protrusions 2a and 5a is provided with a nut. The connecting rod 14 screwed into the connecting rod 19 is pivotally supported by the shaft 17, and the other side is provided with a cut-in groove 18 into which the connecting rod 14 is fitted. It can be attached to the pipe to be cut by simply folding it down and tightening the nut 19 to form the above-mentioned annular groove k.
In addition, fitting the pipe cutting blade d into the annular groove does not require much skill, and can be effectively used as a pair of rings exclusively for guiding the cutting blade.

(Embodiment) A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a front view, Fig. 2 is a partially cutaway side view, Fig. 3 is a perspective view of the connecting rod, and Fig. 4 is a side view showing the state of use.

Fig. 1 shows a ring-shaped guide piece 1 that is fitted closely around the outer circumference of a pipe P, and is composed of four circular arc pieces 2, 3, 4, and 5 made of synthetic resin. a protrusion 2a that protrudes outward in the radial direction;
2b, 3a, 3b, 4a, 4b, 5a, 5b are integrally formed, and grooves 2b _-1 , 3a _-1 , _4a- penetrate in the radial direction in each protrusion except for the protrusion 2a. _{1,4 b-1} ,
5 _a-1 and 5 _b-1 are provided, and the joint plates 6, 7, and 8 are fitted into the grooves other than the grooves 5 _b-1 , and the protrusions 2b, 3a, and 3 are inserted.
b, 4a, 4b, 5a are connected by a shaft 9 passing through each of them, and each part is defined as a joint 10, 10, . . .

The corresponding surfaces of the arcuate pieces 2 and 5 serve as the opening/closing opening 13, and the grooves 5b _-1 of the protrusion 5b are flattened on both sides of the connecting rod 14 as shown in FIG. The portion 15 is fitted and supported by the shaft 17, and the arc piece 2
The projection 2a is provided with a slot 18 into which the threaded part 16 of the connecting rod 14 is fitted and supported, and a tightening nut 19 is screwed into the threaded part 16 protruding from the slot 18.

In the ring dedicated to the guide for cutlery of this embodiment, the tightening nut 19 is loosened as shown by the chain line in FIG. It is held by the shaft 17, the joints 10, 10... and the opening/closing opening 13 are expanded, the opening/closing opening 13 is passed under the pipe P, the opening/closing opening 13 is closed as shown by the solid line in the drawing, and the opening/closing opening 13 is closed by the connecting rod 14. Close it and fit it tightly into the pipe P to prevent it from rotating.

An example of its usage will be explained with reference to FIG. 4. In the figure, a is a crank device for a pipe P using a chain, and a shaft c protruding parallel to the pipe P is connected to a clamp device from a hand-held pipe cutter b. The saw blade d, which reciprocates up and down in the figure, is placed against the side of the pipe P.

The pair of rings dedicated to guiding the cutting blade of the present invention are two in order to create a circumferential groove k sufficient for inserting the saw blade d on both sides of the planned cutting line of the pipe P before attaching the clamp device a to the pipe P. By the installation, the circumferential groove k indicating the planned cutting line is clearly displayed, making it easy to install the clamp device a and the pipe cutter b, and
To accurately cut a pipe P by guiding a saw blade (pipe cutting blade) d without causing lateral vibration when cutting the pipe P.

[Brief explanation of the drawing]

The accompanying drawings show one embodiment of the present invention, with Fig. 1 being a front view, Fig. 2 being a partially cutaway side view, Fig. 3 being a perspective view of the connecting rod, and Fig. 4 being a side view showing the state in use. It is. P... Pipe, 1... Ring-shaped guide piece, 2,
3, 4, 5...Circular piece, 2a, 5b...Protrusion part,
6, 7, 8, ... joint plate, 9 ... axis, 10, 10
...Joint, 13...Opening/closing mouth, 14...Connecting rod, d
...Saw blade, K...Planned cutting line.

Claims (1)

[Scope of utility model registration request] Fit it on both sides of the planned cutting line of the pipe P to be cut,
A pair of ring-shaped guide pieces constituting a circumferential groove k into which a cutting blade d is fitted is composed of several arcuate pieces 5, and a plurality of joints 10 are provided in which both ends of the arcuate pieces 5 are freely bent at a plurality of positions in the circular direction. At the same time, an opening 13 to be fitted into the pipe P is provided at one location, and protrusions 2a and 5a are provided on corresponding sides of the opening 13 to approach each other.
is provided, and a nut 1 is attached to one of the protrusions 2a and 5a.
A connecting rod 14 screwed with 9 is pivotally supported by a shaft 17,
A pair of rings dedicated to guiding a pipe cutting knife, characterized in that the other is provided with a slot 18 into which a connecting rod 14 is fitted.