JPS5846300Y2 - clamp - Google Patents

Description

[Detailed description of the invention] The present invention is a method for connecting small diameter pipes by partially protruding the end of a large diameter pipe to form an excess projection. , relates to a clamp that can be applied to a connection part.

Conventionally, the connection part of pipes of different diameters is one where a large diameter pipe touches a small diameter pipe.
The pipes are contracted in a concentric circle, or conversely, a small-diameter pipe is expanded in a housing adjacent to a large-diameter pipe, but if the difference in pipe diameter is large, it is impossible to contract or expand the pipe.

As a countermeasure to this problem, when shrinking a large-diameter pipe, by partially protruding the end of the large-diameter pipe using press processing to create a protrusion with excess thickness, the shape shown in Figure 1 can be obtained. Since there is a protrusion of 1°1 with excess thickness, the conventional annular clamp cannot be used.

An object of the present invention is to provide a clamp that can be applied to a vertical pipe joint portion in which such an overhang protrusion is formed.

The present invention will be described below based on embodiments and with reference to the drawings.

FIG. 2 is a front view of the first embodiment, in which a large-diameter pipe 2 that has been contracted by forming excess wall protrusions 1 has an arcuate radius 10 on the outer surface between the excess wall projections. It has a holding shape, and a small diameter pipe 3 is fitted inside.

The clamp according to the present invention comes into contact with the outer surface of each half, when the large-diameter pipe 2 is divided in the diametrical direction along a plane that includes the centers of the opposing excess wall protrusions, and both ends meet the plane. It is formed into a two-part shape that faces each other.

The clamp piece 7 has circular arc portions 5, 5 having an inner diameter of a contracted radius of 10 between the convex portions 40 which are bulged in a convex shape while avoiding the excess wall protrusions.
, and the end portions extend in the radial direction beyond the protruding portion 10 and form fastening portions 6, 6 in which bolt holes are drilled.

In order to increase the rigidity of the clamp piece 7 in order to increase the clamping force of the clamp, it is preferable to build up welding on the small radius portion 11 within the convex portion 4 as shown by diagonal lines.

Align the clamp piece 7 with such a configuration to the constriction tube part having two or more excess wall protrusions 1, 1, and tighten the bolt 8 and nut 9.
If you tighten it with , you can firmly connect the contracted tube part.

The ends of the clamp pieces 7 are shaped to avoid each half of the excess wall protrusion 1, so if the large diameter pipe 2 is held between the two clamp pieces 7, 7 and the bolts 8 and nuts 9 are tightened, , both clamp pieces can be joined while avoiding the excess wall protrusion of each one at the end of the clamp piece, and the large-diameter pipe and the small-diameter pipe can be firmly joined.

3 and 4a are front views of the second implementation example and A-
A sectional view is shown.

In this example, the clamp is not divided into two, but is made into an integral clamp 7A, and the convex portions 40 that avoid the three excess wall protrusions 1 are connected by arcuate portions 5, 5 having an inner diameter of 10 the outer radius of the contracted tube portion. However, tightening parts 6, 6, which extend in the radial direction and have bolt holes, are tightened with bolts 8 and nuts 9, avoiding half of the excess projection part 1.

The method of increasing the rigidity, increasing the tightening force, and applying weld build-up to a curved portion with a small radius is exactly the same as in the first embodiment.

However, in the case of this embodiment, if the rigidity of the clamp is increased too much by welding overlay on the curved portion of the convex portion 4 with a small radius, the clamping portions 6, 6 are opened and the clamp is fitted onto the pipe from the side. If the clamp is fitted into the pipe from the axial direction, there will be little problem.

In addition to the above-mentioned cross-sectional shape, the cross-sectional shape of the clamp may be as shown in FIG. 4C, for example.

According to the present invention, when connecting a large-diameter pipe to a small-diameter pipe by forming an excess wall protrusion, good tightening can be achieved with both a clamp piece with a simple mechanism and an integral clamp. There is something like a dog that is effective.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a large-diameter pipe contracted by forming an excess wall protrusion, Figure 2 is a front view of a two-split type clamp that is the first embodiment of the present invention, and Figure 3 is a one-piece type. Second part of the case
The front view of the embodiment, and FIGS. 4a to 4c are sectional views showing three examples of the AA cross section in FIG. 3. 1...Excess wall protrusion, 2...Large diameter pipe, 3...Small diameter pipe, 4...Protrusion, 5...
...Circular part, 6...Tightening part, 7...
・・Clamp piece, 7A・・Integrated clamp, 8・
...Bolt, 9...Natsuto, 1.0...
・・・・Radius of constriction part.

Claims (1)

[Scope of utility model registration request] In a clamp used for connecting a pipe of a different diameter to fit a small-diameter pipe to a large-diameter pipe that has been contracted by partially protruding the pipe end to form an excess-thickness protrusion, the excess-thickness protrusion is A convex part that avoids this, a circular arc part whose inner radius is the outer radius of the contracted pipe part, and a tightening part that extends outward in the radial direction of the pipe avoiding half of the excess wall protrusion part and is tightened by a bolt nut. A clamp made of