JPH0448393Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a U-shaped bolt for piping for restraining the piping to a receiving frame.

[Conventional technology]

Figure 2 shows a conventional U-shaped bolt for general piping.
A U with a bent portion 10A and threaded portions 10B at both ends.
Bolt 10, nut 15, flat washer 13,
It is composed of a spring washer 14.

The installation method is to place the U-shaped bolt 10 on the pipe 11, pass the threaded part 10B through the mounting hole 17 of the cradle 16, and tighten the pipe 11 by turning the nut 15 together with the flat washer 13 and spring washer 14.
is restrained to the receiving stand 10.

However, in this mounting method, when the pipe 11 expands and contracts in the axial direction due to thermal effects or the like, the pipe 11 and the U-shaped bolt 10 come into contact at the P portion, and the movement of the pipe 11 is hindered due to the tightening force. Therefore, there is a drawback that abnormal stress acts on either the piping 11 or the U-shaped bolt 10, causing deformation and damage. FIG. 3 is also a conventional technique, but in order to maintain the gap G between the U-shaped bolt 10 and the pipe 11 at the P portion, a thin nut 18 is fitted in a fixed position on the upper surface 20 of the receiving frame determined by the pipe size. It is a combination of However, with this method, U
When inserting the shaped bolt 10 from above the pipe 11, the peripheral edge of the thin nut 18 comes into contact with the side surface of the pipe 11, making installation difficult, and there is a drawback that a part of the thin nut 18 must be cut. .

An example of a U-shaped bolt for piping that improves these drawbacks is disclosed in Japanese Utility Model Application No. 60-126776.

As shown in FIG. 4, this U-shaped bolt 10
For example, a half-split flat washer 19 is attached as a positioning member to the outer surface of the U-shaped bolt 10 that matches the fixed position of the upper surface 20 of the receiving frame determined by the pipe size.
It is attached by welding etc. Therefore, when the U-shaped bolt 10, together with the flat washer 13 and spring washer 14, tightens the nut 15, the half-split flat washer 19 hooks on the upper surface 20 of the receiving frame and becomes a stopper. As a result, the state in which the pipe 11 and the U-shaped bolt 10 do not come into contact can be maintained.

However, in this U-shaped bolt 10, a halved flat washer 19 is attached to the U-shaped bolt 1 in advance.
0, and in order to change the gap between the pipe 11 and the U-shaped bolt 10, it is necessary to change the welding position of the half-split flat washers 19 to the U-shaped bolt 10. . Also,
The halved flat washer 19 and its welding work are required, which increases the cost. Furthermore, since the halved flat washer 19 is welded to the U-shaped bolt 10, when tightening the pipe 11 at the U-shaped bolt 10, another U-shaped bolt, that is, the halved flat washer 19 is not welded. You will need to prepare a U-shaped bolt.

[The problem that the idea attempts to solve]

This invention solves the shortcomings of the prior art and
To provide a U-shaped bolt for piping, which can maintain a gap between it and the U-shaped bolt, and can easily adjust the dimension of the gap.

[Means to solve the problem]

The present invention is a U-shaped bolt that has a U-shaped bent part and threaded parts at both ends for restraining piping to a support frame, and the shaft diameter of the U-shaped bent part is larger than the shaft diameter of the threaded part. The threaded portion and the U-shaped bent portion are continuous at a tapered boundary different diameter portion, and a flat washer is engaged with this boundary different diameter portion.

[Effect]

According to the above configuration, the U-shaped bolt is placed on the pipe, the threaded part is passed through the mounting hole of the receiving frame and the flat washer provided on the upper surface of the receiving frame, the nut is fitted together with the flat washer, and the nut is tightened to receive the pipe. Restrain to the stand. At this time, the flat washer, which has a hole diameter intermediate between the shaft diameter of the bent part and the shaft diameter of the threaded part, is caught on the tapered boundary different diameter part between the threaded part and the U-shaped bent part, and the stopper becomes. As a result, a gap is created between the piping and the U-bolt,
It is possible to maintain a state in which the piping and the U-shaped bolt do not come into contact with each other. Further, by changing the hole diameter or plate thickness of the hole in the flat washer, the size of the gap can be easily adjusted.

Further, it can be manufactured at low cost since no positioning member or welding work is required, and it can also be used to tighten piping when a flat washer is not used.

〔Example〕

FIG. 1 shows an embodiment of the invention.

A U-shaped bolt 10 having a bent portion 10A and a threaded portion 10B with a shaft diameter smaller than the bent portion, and a flat washer 1
2, 13, spring washer 14, nut 1
Consists of 5. Bent part 10A and threaded part 10B
The position of the tapered boundary different diameter portion between the pipes is a fixed position on the upper surface 20 of the receiving frame determined by the pipe size. The installation method is to connect U-shaped bolt 10 to piping 11.
The threaded part 10 is placed on the mounting frame 16 and the flat washer 12 provided in the mounting hole 7 of the cradle 16 and the top surface 20 of the cradle.
Through B, fit nut 15 together with flat washer 13 and spring washer 14, and tighten nut 1.
5 to restrain the tightening piping 11 to the receiving frame 16. At this time, the shaft diameter of the bent portion 10A and the threaded portion 10
A flat washer 12 having a hole diameter intermediate to the shaft diameter of B is hooked on the tapered boundary different diameter portion of the U-shaped bolt 10 and becomes a stopper. As a result, piping 11
A gap G is generated between the pipe 11 and the U-shaped bolt 10, and a state in which the pipe 11 and the U-shaped bolt 10 do not come into contact can be maintained. Further, by changing the hole diameter or plate thickness of the hole in the flat washer 12, the size of the gap G can be easily adjusted.

Further, in the U-shaped bolt 10 of this embodiment, a half flat washer 1 is used as in the prior art shown in FIG.
3 and its welding work are not required and can be manufactured at low cost. Furthermore, when the flat washer 12 is not used, it is also possible to tighten the pipe 11 in the same manner as shown in FIG.

[Effect of idea]

By maintaining a gap between the piping and the U-shaped bolt, it is possible to expand and contract the piping in the axial direction, which is affected by heat, and it is possible to prevent deformation and damage to the piping or the U-shaped bolt. Furthermore, the size of the gap can be easily adjusted by changing the hole diameter or plate thickness of the hole in the flat washer.

[Brief explanation of the drawing]

FIG. 1 is a side view of the exhibition device according to the embodiment, and FIG.
Figures 1 to 4 are side views of conventional U-shaped bolts for piping. 10...U-shaped bolt, 10A...Bent part, 10
B...Threaded part, 11...Piping, 12...Flat washer, 15...Nut, 16...Bracket, 20...
...Top surface of the cradle.

Claims (1)

[Scope of utility model registration request] A U-shaped bolt with a U-shaped bent part and threaded parts at both ends is used to restrain piping to a support stand.
The axial diameter of the U-shaped bent portion is larger than the axial diameter of the threaded portion, and the threaded portion and the U-shaped bent portion are continuous at a tapered boundary different diameter portion, and this boundary different diameter A U-shaped bolt for piping, characterized in that a flat washer engages with the part.