JPS5846299Y2 - clamp - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamp that is applied to the fitting portion of a large-diameter pipe that is fitted with a small-diameter pipe by shaping a large-diameter pipe by enhancing the shape of the drawing wall protrusion.

Conventionally, when connecting pipes of different diameters, a small-diameter pipe is expanded and brought into contact with a large-diameter pipe, or a large-diameter pipe is contracted and brought into contact with a small-diameter pipe, and the joint between the two is clamped and tightened. Ta.

Figure 1 A and B are regular U-bolt clamps, Figure 2 A and B
Figure 3 shows a folded plate lamp with a U-shaped cross section, Figures 3A and H show a plate-wrapped clamp using a strip plate, and Figures 4 A and B show a side view and front color of a mating clamp with a U-shaped cross section. Since it is well known, explanation of the operation etc. will be omitted.

However, recently, double-pipe exhaust pipes as shown in Figure 5 A and B have been developed as a measure against exhaust gases, but when actually installed in a vehicle and the engine is operated, the outer pipe is squeezed and an excess wall is formed. It is necessary to tighten the fitting part because a gap is created in the fitting part that is in contact with the inner tube, and the inner tube and the outer tube collide with each other due to vibration, causing abnormal noise.

However, it is not possible to use clamps of the conventional type as shown in FIGS. 1-4.

The present invention provides an improved clamp that can be applied to the fitting portion of such a large-diameter pipe, even when the large-diameter pipe is brought into fitting contact with a small-diameter pipe by enhancing the shape of the extra drawing wall protrusion.

Clamps having the structures shown in FIGS. 6A and 6B have been separately devised as clamps for use in fitting portions of pipes having such overhanging protrusions.

This is a holding piece 2 between the center part of the U-bolt 3 that is large enough to hold the excess wall protrusions 1, 1 of the tube shrinking section 4 and the tube shrinking section 4 between the excess wall protrusions 1, 1. The support part 5 also has a
The structure is such that the notch is formed so as to avoid the excess wall protrusion 1 and come into contact with the tube contraction part 4.

This clamp can effectively tighten the constricted tube section that has an excess protrusion, but it requires a large number of parts and a complicated structure.The present invention therefore proposes a clamp that has a simple structure, a small number of parts, and can be manufactured at low cost. It was designed for the purpose of obtaining.

The present invention, as shown in the embodiment of FIG. 7, has both legs 7a, ?
In the middle part of the leg 7a, bend this part inward of the U-bolt and curve its inner surface to correspond to the outer surface of the tube contraction part 4 to form an abutment part 6, and the end of the leg 7a. The U-bolt is rolled into a flat plate, a hole is formed, a bolt 8 is inserted through the U-bolt, and the end of the U-bolt is tightened with a nut 9 in a direction in which the abutting portions 6, 6 of the legs approach each other.

Since the clamp of the present invention is constructed as described above, it can be constructed extremely easily, has a small number of parts, can be manufactured at low cost, and can be used to reduce tube contraction between the two excess wall protrusions 1, 1. It has a great practical effect as a clamp that can tighten the portion 4.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional clamps, Figure 1A is a side view of a U-bolt clamp, Figure 1B is a front view of the same, Figure 2A is a side view of a plate-folding lamp, and Figure 2B is a side view of a U-bolt clamp. Front view of the same, Figure 3A
3B is a front view of the same, FIG. 4A is a side view of the mating clamp, FIG. 4B is a front view of the same, and 5
Figure A is a longitudinal sectional side view of the fitting part of the large and small tubes provided with the excess wall protrusion, Figure 5B is a sectional view taken along the line a-a of Figure 5A, and Figure 6A is a front view of the U-bolt type clamp. , FIG. 6B is a sectional view taken along the line a-a of FIG. 6A, and FIG. 7 is a front view of an embodiment of the present invention in which a U-bolt clamp is provided with an abutting portion. 1...excess meat protrusion, 2...pressing piece,
3... U bolt, 4... Constriction section, 5.
...support part, 6...contact part, 7...
...U bolt, 7a...leg, 8...bolt, 9...narato.

Claims (1)

[Scope of utility model registration request] This is a clamp used for the connection of different diameter pipes, where a small diameter pipe is fitted to a large diameter pipe that has been shrunk by partially protruding the pipe end to create a projection with excess drawing wall. Bend the legs 7a, 7a of the U-bolt 7, which is large enough to hold the protrusions 1, 1, in the middle of the U-bolt, and then bend the inner surface of the U-bolt inward to the outer surface of the constriction section 4 of the large-diameter pipe. A clamp comprising a correspondingly curved abutment part 6, an end of the leg 7a rolled into a flat plate, a hole drilled therein, and a bolt 8 and nut 9 inserted into the hole attached.