JPH02220718A - Method and tool for bending of lead pipe - Google Patents

Abstract

PURPOSE:To execute bending which requires no skill, and scarcely generates an uneven metal and a fold by inserting a coil spring ito a bend part of a lead pipe, inserting a jig consisting of a special cylindrical body and a lever along the outside periphery of the pipe and executing the bending. CONSTITUTION:A coil spring 3 is inserted into a bend part in a lead pipe 1 in accordance with length of the band part. Subsequently, a working tool formed by connecting a jig which consists of a horseshoe support part 4 and a cylindrical body part 5, and in which a connecting part of both of them is curved by 90 deg., and a lever 7 is inserted to the bend pat along the outside periphery of the lead pipe 1. Next, force is applied as indicated with an arrow Y, and the lead pipe 1 is bent along the jig 6. Together with a fact that the coil spring 3 is inserted, bending can be executed without crushing the bend part. The working tool is freely attachable and detachable, and can be disassembled simply. In such a way, compounded bending can be executed easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention allows lead pipes used for drainage in washrooms and toilets to be easily and reliably bent at room temperature without the need for modification of the bent portion. The present invention relates to a processing method and a processing tool.

[Conventional technology]

Conventionally, in order to bend a lead pipe, the lead pipe 20 is bent as shown in Figure 4.
A pry bar 21 was inserted into both ends of the pry bar, one of the pry bars was pushed out with a foot 22, and the other pry bar was bent by applying force as shown by arrow F with a hand 23. At that time, the bent portion 24 was crushed as shown in FIG. 5, and the bent portion 24 became shaped as shown in FIG. 6, which shows the cross section of the bent portion 24 along the line A-A. After the bending process, it was necessary to correct the bent portion 24 using various tools. Therefore, it has been attempted to reduce the deformation by putting sand into the bent part, but it is still necessary to avoid deformation of the cross section of the bent part, and correction work is still necessary.

Therefore, the bending process required a skilled person, and it took time and effort to correct uneven thickness and wrinkles after bending, resulting in poor efficiency.

(Means for Solving the Problems) In order to eliminate the conventional drawbacks, the present invention provides a jig consisting of a horseshoe-shaped support part and a cylindrical body, which is curved at 90 degrees at the connection part, and the cylindrical body. A bending method in which a coil spring is inserted into the bent part of a lead pipe, and the bending tool is inserted along the outer periphery of the lead pipe to perform the bending process using a bending tool consisting of a lever rod that is detachably attached to the lead pipe. and a bending tool.

(Embodiment) FIG. 1 is a side sectional view of a first embodiment of the bending tool of the present invention.
FIG. 2 is a front view of FIG. 1 viewed from the R direction, and the jig 6 consists of a horseshoe-shaped support portion 4 and a cylindrical body portion 5, and the connection portion between the two is curved <901 as shown in the figure. are doing. This cylindrical body 5 can be inserted along the outer circumference of a lead pipe l (represented by broken lines in FIG. 1) to be bent. Reference numeral 7 is also a hollow lever rod which can be inserted along the outer periphery of the lead pipe 1, and a screw 10 is provided on the outer periphery of the lower end thereof.

Further, a screw 9 is provided on the outer periphery of the upper end of the cylindrical body 5. The cylindrical body 5 and the lever bar 7 are removably connected to each other by a joint 8 having screws 11 and 11 provided on the inner periphery of the upper and lower ends thereof. Note that 3 is a coil spring inserted inside the bent portion of the lead pipe 1.

FIG. 3 shows a second example with a different means of connection between the cylindrical body 5 and the lever bar.
An example is shown in which the cylindrical body 5 and the pry bar 7 are connected from both ends of the joint 120.
is inserted into the hole 13 of the joint 12 and fixed with a bolt 14.

(Function) In the bending process, first insert the coil spring 3 into the bent portion of the lead pipe 1 according to the length of the bent portion, and then use the jig 6 and lever 7 shown in FIGS. 1 to 3. Insert the processing tool connected to the lead pipe 1 along the outer periphery of the lead pipe 1 to the bending part, apply force as shown by arrow Y, and bend the lead pipe 1 along the jig, resulting in a bent pipe as shown in 2. .And coil spring 3 inside
Coupled with the fact that it has a curved part, it is possible to perform bending without crushing the bent part.

After processing, since the jig 6 has the horseshoe-shaped support portion 5, the entire tool can be pulled out upward in FIG. Moreover, the internal coil spring 3 can be pulled out by lightly tapping the outer periphery of the lead pipe.

Furthermore, in the past, the composite joints shown in Figure 7 had to be connected by soldering, etc. at the part A in the figure, but with the method and tool of the present invention, composite joints can be easily made. .

[Effects] The bending method and tool of the present invention are as described above: (1) Bending does not require any skill, and even beginners can easily form a tube.

(2) Since it can be processed at room temperature, there is no need to heat it or prepare a heat source.

(3) Processing time can be shortened. This can be done in less than half the time compared to conventional methods.

(4) Since there are few uneven thicknesses and wrinkles after processing, there is no need for correction work.

(5) The processing tools are detachable and easily disassembled, making it easy to carry.

(6)? j [Bending process can be easily performed.

It has many effects such as:

[Brief explanation of the drawing]

1 is a side sectional view of the bending tool of the present invention, FIG. 2 is a front view of FIG. 1 viewed from the R direction, FIG. 3 is a side sectional view of another embodiment, and FIG. FIG. 5 is an explanatory diagram of a conventional bending method, FIG. 6 is a sectional view taken along the line AA in FIG. 5, and FIG. 7 is an explanatory diagram of a state of composite reversal. [Explanation of symbols] l... Lead pipe to be processed 2... Lead pipe 3 after bending
...Coil spring 4...Horseshoe-shaped support part 5.
...Cylindrical body part 6...Jig 7...Pry bar
8...Coupling 9, l0111 Screw 12.
...Joint 13...Inner hole 14...Bolt 20...Lead pipe 21...Pry bar 22...
・Hand 24...Bending part 23...Foot diagram diagram

Claims (2)

[Claims] (1) In the lead pipe bending method, (a) a coil spring is inserted into the bending part of the lead pipe, (b)
) One end is a horseshoe-shaped support part, the other end is a cylindrical body, and at the connection part of the horseshoe-shaped part and the cylindrical body, 90
° Inserting a curved jig and a pry bar attached to the cylindrical part of the jig along the outer periphery of the lead pipe so that the jig part is at the bending part, ( c) A method for bending a lead pipe, comprising the following steps: bending the lead pipe along the curved part of a jig by operating a pry bar at room temperature. (2) One end is a horseshoe-shaped support part, the other end is a cylindrical body that can be inserted along the outer periphery of the lead pipe, and the jig is curved at 90 degrees at the connection between the horseshoe-shaped part and the cylindrical body. A lead pipe bending tool comprising: a hollow pry bar that can be inserted along the outer periphery of a lead pipe; and means for detachably connecting the jig and the pry bar.