JPS5846297Y2 - Fasteners for pipe connections - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe connection fastener that tightens the fitting portion of pipes of different diameters.

Conventionally, in order to connect pipes of different diameters, as shown in FIG.
As shown in the figure, the large-diameter pipe 7 was contracted into a concentric circle until it came into contact with the small-diameter pipe 8, and the U-bolt 1 and the receiver shown in Fig. 3 were fastened with a general fastener using the tool 2. Processing was impossible when the difference in diameter was large or when the tube expansion or tube contraction section could not be lengthened.

In such a case, when shrinking the large-diameter pipe 7, a portion of the large-diameter pipe 7 is pinched out by press processing and crushed to form an excess protrusion 4 as shown in FIG. 4, which shows an embodiment of the present invention. A method is being considered to reduce the size of large-diameter pipes.

The present invention provides a fastener for connecting pipes of different diameters by contracting a large-diameter pipe using such an over-thickened protrusion.

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

Figure 4 is a front view of the first embodiment, and Figure 5 is A-A in Figure 4.
FIG.

In this embodiment, the large-diameter pipe 7 has a small-diameter pipe 8 at a constricted pipe part 7a formed by projecting the excess wall protrusions 4 at four locations outward.
It is fitted externally.

The main parts of the fastener that connects the tubes 7 and 8 at this fitting part include a U bolt 1, a receiver 2, a spacer 3, and a tightening nut 9.

The U-bolt 1 is of a normal type, and its curved inner diameter is slightly larger than the diameter of the circumscribed circle of each surplus projection 4.
The receiver 2 is made by bending a metal plate to form a bottom portion 2b and two front and rear edges 2a, 2c, and its longitudinal section is approximately a half-section of an inverted "U" with the top open. .

The center part 5a of the front edge part 2a of this holder 2 has a thick-boned shape with the same radius of curvature as the constricted pipe part 7a of the large-diameter pipe 7, and has a notch 6 in the center to avoid the excess protrusion 4. The edge of the central portion 5a comes into contact with the outer circumferential surface of the tube contraction portion 7a.

Two through holes through which the U bolts 1 are inserted are bored at both ends of the bottom 2b of the receiver 2.

On the other hand, the center portion 5C of the rear edge portion 2C has a thick-boned shape with the same radius of curvature as the outer diameter of the unreduced portion of the large-diameter tube 7, and is the outer circumferential surface of the original portion of the large-diameter tube 7 that is not reduced in diameter. It is designed so that it can come into contact with the

Therefore, this central portion 5c is the central portion 5 of the front edge portion 2a.
It is slightly larger than A and is generally lower than A.

The spacer 3 is a member whose cross section is approximately U-shaped as shown in FIG. 6, and whose overall shape is circular as shown in FIG. 4, and has a cross-sectional radius slightly larger than that of the U-bolt 1 on its outer peripheral surface Grooves are formed.

Since the radius of curvature of the spacer 3 on the bottom surface of this groove in the length direction is formed to be the same as the radius of curvature of the inner circumference of the U bolt 1, the bottom surface of this groove extends over the entire length of the spacer 3.
Touches the inner edge of the bolt.

On the other hand, the inside of this spacer 3 is a constricted pipe part 7a of the large diameter pipe 7.
The contact surface 3d has approximately the same radius of curvature as the outer surface of the contact surface 3d, and the length of the contact surface 3d is made approximately equal to the interval between the surplus projections 4.4.

In this example, the dimension B (FIG. 6) from the contact surface of the spacer 3 with the U bolt (the bottom surface of the groove) to the contact surface 3d with the tube contraction part 7a is the upper part 3a of the spacer 3 ( The lower part 3b is made slightly larger than that shown in Fig. 4).

Therefore, the radius of curvature of the approximately semicircular portion formed by the contact surfaces 3d, 3d of the two spacers 3.3 is formed such that it gradually becomes smaller from the upper part toward the lower part 3b. The abutment surfaces 3d and 3d of No. 3 can strongly press the contracted tube portion.

Such a spacer 3 is arranged between the excess wall protrusions 40,
If necessary, a notch 3c protruding toward the U-bolt 1 is formed on a part of the upper surface of the spacer 3 to loosely connect the spacer 3 to the U-bolt 1 so as not to separate it.

Even when such a U-bolt 1 and spacer 3 are connected, the position of the spacer 3 can be adjusted along the U-bolt 1 using a chisel or a hammer.

Since it has such a configuration, the excess wall protrusion 4
The large-diameter pipe 7 is fitted with the small-diameter pipe 8 by shrinking the pipe.
The receiver 2 is placed on the contracted tube section 7a of the tube, and the spacers 3.3 are arranged so that the abutting surfaces 3d of each spacer 3.3 are located between the excess protrusions 40 of the contracted tube section 7a. When both ends of the bolt 10 are inserted into the through holes at both ends of the bottom 2b of the receiver 2, and the nuts 9 are screwed onto both ends of the U bolt 10 protruding from the lower surface of the bottom and tightened, the large diameter pipe 1 is compressed. Since the tube portion 7a can be tightened while avoiding the protruding portion, the tube contraction portion 7a is pressed by the abutment surface 3d of the spacer 30, and a portion of the tube portion 7a has a large diameter at the front edge 2a of the tool 2 and a large diameter portion at the rear edge 2c. It supports the original tube portion of the tube and can perform strong tightening at the contracted tube portion.

The tube contraction section formed by the excess wall protrusion 4 is likely to become loose when a small-diameter tube is simply inserted into it due to the protrusion opening due to vibration or thermal deformation.
is to prevent this gap.

That is, since the spacer 3 and the receiver 2 tighten the reduced diameter portion 7a from the outside, the protrusion 4 will not open.

At this time, as mentioned above, from the upper part 3a of the spacer to the lower part 3b
Since the width B (Fig. 6) is large, tensioning of the U-bolt not only tightens the bolt in the vertical direction, but also tightens it in the lateral direction.

Furthermore, if the width of the contact surface 3d is narrowed, the tightening pressure will naturally increase.

In addition, in this embodiment, the reduced tube portion 7a of the large diameter tube I of the fitting portion
is relatively short, so the rear edge 2c of the receiver 2 comes into contact with the outer surface of the large-diameter pipe 7 that has not been contracted. However, if the contracted section 7a can be made sufficiently long, This rear edge portion 2c has exactly the same shape as the front edge portion 2a, and both edges 2a of the receiver 2.

2c is formed by a notch 6 provided in the center of the projection 4.
It is also possible to avoid this so that they come into equal contact with the tube contraction portion 7a.

1 and 8, the receiver is made to hold another spacer 10, and the front edge 2a of the receiver 2 is used to hold the tube contraction part 7a.
An application example of the present invention will be shown in which, in addition to tightening the spacer 10, the reduced diameter section 7a of the large diameter pipe is also tightened between the front edge 2a and the rear edge 2c.

In this case, in order to strongly tighten the spacer 10 in the vertical direction in the figure, the extra-thickness protrusion 4 is not positioned vertically but is placed at a 45 degree side, with the spacer 3 from the top and the holder from the bottom. The front edge 2a of the tool 2 and this receiver are tightened by a spacer 10 attached to the upper surface of the tool 2.

This structure is effective in preventing rattling sounds caused by deformation or the like.

The present invention is based on a common U-bolt type fastener, and by making slight modifications and adding parts, it provides a highly effective fastener for strongly tightening pipe bed joints of different diameters that have excess wall protrusions. There is something.

[Brief Description of the Drawings] Figure 1 is a vertical side view showing the connection of pipes of different diameters by conventional tube expansion, Figure 2 is a longitudinal side view showing the connection of pipes of different diameters by contraction, and Figures 3a and b. are front and side views of conventional fasteners,
FIG. 4 is a front view of the first embodiment of the present invention, FIG. 5 is a sectional view taken along the line A-A in FIG. A front view of the second embodiment, and FIG. 8 is a sectional view taken along the line BB in FIG. 7. 1: U bolt, 2: Holder, 3 Ni spacer, 4: Excess wall protrusion, 7: Large diameter pipe, 7a: Reduction part of large diameter pipe, 8
: Small diameter pipe, 10 nis spacer.

Claims (1)

[Scope of utility model registration request] 1. In a fastener used for fitting different diameter pipes, in which a small diameter pipe 8 is fitted to a reduced pipe part 7a of a large diameter pipe 7 which has been reduced by forming an excess drawing part 4 at the pipe end, two Excess meat protrusion 44
The reduced tube portion 7 of the large-diameter tube 7 inserted between 0 and between the surplus protrusions 4 and 40
By providing a spacer 3 that comes into contact with a part of a and a notch 6, it is possible to avoid the excess wall protrusion 4 and attach it to the remaining reduced tube portion 7a between the excess wall protrusions 4 and 40 of the large diameter pipe 7. A pipe connecting fastener characterized in that the tube constricting portion 7a is tightened by the U bolt 1 via the receiver 2 which abuts and has the U bolt 1 inserted through both ends thereof. 2. Utility model registration claim l) By making the cross-sectional shape of the spacer 3 thinner at the inner part of the U-bolt 1 and thickening it in the direction of the threaded part of the U-bolt 1, the tightening force in the direction perpendicular to the tightening direction is increased. A pipe connection fastener characterized by causing