JP2003340731A - Spanner for flange - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a nut N must be held by a spanner when loosening a bolt B tightening a flange F, but the spanner cannot be fully held if there is an obstacle around the flange F. <P>SOLUTION: A stopper part 3 is provided in the vicinity of a spanner part 2, and the stopper part 3 is abutted on an outer peripheral surface of the flange F so that the spanner 1 need not be tightly held by hand. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange wrench used to fasten and unfasten flanges for interconnecting pipe lines.

[0002]

2. Description of the Related Art When connecting pipes, a disk-shaped flange is fixed to each end of a pair of pipes to be connected by welding or the like, and the flanges are joined together to form a bolt. Fastened with nuts. The flange has a through hole through which the bolt is inserted. When the flanges are aligned with each other, the phases of the flanges are aligned so that the through holes of both flanges are aligned with each other, and the bolt is inserted over both through holes. Then, a nut is screwed on the tip of the bolt protruding from the through hole to firmly fasten both flanges.

On the contrary, when the fastening state of both flanges is released, the nut is removed from the bolt and the bolt is pulled out from the through hole.

[0004]

As described above, when fastening both flanges, it is necessary to turn the bolt while fixing the nut with a spanner so that the nut will not rotate idle. Further, when releasing the tightened state, it is necessary to turn the bolt with the nut fixed with a spanner.

In order to fix the nut, it is necessary to hold and fix the spanner while rotating the bolt so that the spanner does not rotate together with the nut. However, although there are obstacles around the flange and the spanner can be engaged with the nut, it may be difficult to exert a gripping force enough to fix the spanner on the spanner.

In such a case, it becomes difficult to fasten the flange and release the fastened state, the working time becomes long, or the number of workers must be increased.

In view of the above problems, the present invention provides a flange spanner capable of easily engaging and disengaging the flange even if there are obstacles around the flange. This is an issue.

[0008]

In order to solve the above-mentioned problems, a flange spanner according to the present invention has a bolt inserted into through holes provided in both of a pair of flanges and a nut screwed to the bolt. In a flange spanner used to fasten both flanges with or to release the fastened state, a spanner portion that engages with either one of the bolt and the nut, and this spanner portion engages with the bolt or the nut. In this state, an anti-rotation portion is provided which abuts the outer peripheral surface of the flange and prevents the spanner portion from rotating together with the bolt or the nut.

When the wrench portion engages with one of the bolt and the nut, the wrench portion tries to rotate together when turning the other. At this time, since the detent portion comes into contact with the outer peripheral surface of the flange, the spanner portion cannot exceed it. Therefore, even if you do not press firmly so that the spanner part does not rotate,
The spanner will not rotate.

If the detent portion is constructed to be welded to the wrench portion, the strength of the detent portion can be increased.

On the other hand, if the above-mentioned detent portion is detachably attached to the spanner portion, the spanner portion can be used at a place other than the flange by removing the detent portion.

[0012]

1 is a spanner for a flange according to the present invention. A wrench portion 2 that engages with the head of the bolt B or the nut N is provided at the tip of the wrench 1.
Are formed. Further, a rotation stop portion 3 is welded to the center side of the spanner portion 2.

The detent portion 3 is welded so as to project on both the upper surface and the lower surface in FIG. The detent portion 3 is curved and welded so that the radius of curvature is slightly smaller than the curvature of the outer peripheral surface of the flange F.

As shown in FIG. 2, when the spanner portion 2 of the spanner 1 is engaged with the nut N, both ends 31 of the detent portion 3 come into contact with the outer peripheral surface F1 of the flange F and the spanner 1 rotates. Configured to prevent. In this state, when the bolt B is rotated in either the left or right direction, the spanner 1 does not rotate, so the nut N does not rotate together with the spanner portion 2. Further, at this time, the operator can remove the nut N from the spanner portion 2.
All you have to do is hold the wrench 1 lightly so that it will not come off.

In the above embodiment, the whirl-stop portion 3 is welded and fixed to the spanner 1, but the whirl-stop portion 3 may be detachably attached to the spanner 1. For example, as shown in FIG. 3, the support shaft 32 may be screwed to the spanner 1, and the rotation stopping portion 3 may be attached to the support shaft 32 so as to be swingable within a predetermined range.

When the detent portion 3 is detachably attached to the spanner 1 as described above, the spanner 1 can be used as a fastening portion other than the fastening of the flange by removing the detent portion 3. Further, as shown in FIG. 3, when the rotation stopping portion 3 is attached so as to be swingable, the spanner portion 2 can be applied to the nut N from a wide range regardless of the position of the phase of the nut N. , It becomes easy to engage the spanner portion 2 with the nut N. When the bolt B is rotated counterclockwise in the figure, the spanner 1 is rotated counterclockwise together with the nut N, but when the bolt B is rotated to the position shown by the chain double-dashed line in the figure, it does not rotate any more. After that, it is only necessary to hold the spanner 1 to the extent that it does not fall off.

[0017]

As is apparent from the above description, according to the present invention, when a flange is fastened or when the fastened state is released, the work of pressing a bolt or a nut with a spanner does not require a large gripping force. It can be carried out.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a plan view showing a usage state of a spanner.

FIG. 3 is a partially enlarged view showing another embodiment.

[Explanation of symbols]

1 (for flange) spanner 2 spanner 3 Anti-rotation part

Claims (3)

[Claims] 1. A flange used when fastening both flanges with a bolt inserted into a through hole provided in both of a pair of flanges and a nut screwed with the bolt, or when releasing the fastening state. In a spanner for use, a spanner portion that engages with either one of the bolt and the nut,
A spanner for a flange, characterized in that the spanner portion is provided with a rotation preventing portion that abuts on the outer peripheral surface of the flange in a state of being engaged with the bolt or the nut and prevents the spanner portion from rotating together with the bolt or the nut. . 2. The flange wrench according to claim 1, wherein the detent portion is welded to the wrench portion. 3. The rotation stopping portion is detachably attached to the spanner portion.
Spanner for the described flange.