JPH0222223Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal fitting for preventing nuts from spinning when fastening flanges and the like with bolts and nuts.

[Conventional technology]

Conventionally, tightening bolts and nuts requires holding the nut with a spanner or the like to prevent the nut from rotating as the bolt is tightened.

In addition, the distance between the connecting flange surfaces is large,
In cases where it was not possible for one person to perform the tightening work, it was common practice to leave the wrench engaged with the nut and use the wrench to hang the wrench on the protrusion of the flange or other nuts.

[The problem that the idea attempts to solve]

However, when connecting a large pressure vessel or heat exchanger flange to the main body, the tightening force of bolts and nuts is extremely large, and the former method of holding the bolts and nuts with a spanner causes the tightening to loosen. There are other problems.

Furthermore, the method of tightening bolts with a wrench applied to other parts may make it difficult to remove the wrench after the tightening process, and this method cannot be applied to the production of machine elements that require large fastening forces. be.

The purpose of the present invention is to reliably prevent the nuts from spinning during the tightening work of bolts and nuts with strong fastening force, and to improve work efficiency by allowing the nuts to be easily attached and detached after the work.

[Means to solve the problem]

In order to achieve the above object, the present invention is a follow-up prevention metal fitting used when bolts are arranged at pitch intervals and nuts are sequentially fastened or unscrewed to each of these bolts, A fitting part with a polygonal opening cross section into which the nut is removably fitted is provided at one end of the main body, and an arm part is extended in one direction from the fitting part to connect the tip of the arm and the center of the fitting part. A distance is formed to be longer than a pitch interval of the bolts, a recess is provided in the surface of the arm facing the rotational direction of the bolt, and the proximal end is pivotally attached to the fitting part side in the recess, and the distal end side is An auxiliary lever is provided that is capable of coming out and retracting from the recess, and an operating bolt is screwed onto the tip of the arm from a surface opposite to the mounting surface of the auxiliary lever. The main body is characterized in that a leaf spring is provided on the peripheral wall of the main body, the leaf spring being pressable in the direction of exiting from the recess and further biasing the auxiliary lever toward the recess.

[Effect]

When a nut is screwed onto a row of bolts arranged at pitch intervals, the nut is loosely screwed onto the bolt, and then the fitting portion of the main body is fitted onto the nut to be fastened. At this time, since the auxiliary lever is located on one side of the arm portion facing in the direction of rotation of the bolt, it can be hung on it as a reaction force receiver using an adjacent tightened nut or the like. Therefore, when the bolt is rotated using a wrench, automatic tightening device, etc., the nut is restrained from rotating by the fitting part of the main body, so the nut is fastened to the bolt without rotating. .

On the other hand, when the operation bolt is loosened after the tightening is completed and the pressure on the auxiliary lever is released, the auxiliary lever is pushed into the recess of the main body by the leaf spring, and the tightened nut used as a reaction force receiver is removed. Move away from the component. Therefore, the fitting part of the main body is only fitted into the nut that was being fastened,
The main body can be removed.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a front view of a metal fitting A for preventing trailing rotation according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view showing a working state.

A fitting part 2 having a regular dodecagonal opening cross section is formed on one side of the main body 1 of the tail rotation prevention fitting A, and
It has a spanner shape with an arm portion 3 extending from the fitting portion 2. The length of the arm part 3 is such that when the nut 21 is fitted into the fitting part 2 as shown in FIG. do.

Reference numeral 4 denotes a female screw hole on the tip side of the arm portion 3 having an axis perpendicular to the two axes of the fitting portion, and 5 denotes an operation bolt that is screwed into the female screw hole 4 and presses an auxiliary lever (described later) with its tip. It is. Also, 6 is the operation bolt 5
, and 7 is a recess provided in the surface of the arm portion 3 in the direction in which the bolt 20 rotates as shown in FIG. This is a leaf spring that is integrated into the main body 1 by a stop pin 10 and presses and biases the auxiliary lever 7 in the direction of the recess 6.

The work of fastening bolts and nuts using the anti-rotation fitting A having the above configuration is performed in the following manner.

As shown in FIG. 3, the fitting part 2 of the main body 1 is fitted into the nut 21 screwed onto the bolt 20 to be fastened, and the operating bolt 5 is rotated and extended in the direction of the auxiliary lever 7, and the auxiliary lever 7 is moved into the recessed part. Let it stick out from 6. After the main body 1 is set so that the auxiliary lever 7 comes into contact with the nut 22 which has already been tightened, the bolt 20 is rotated in the direction of the arrow in the figure and tightened. At this time, the nut 21 similarly receives a rotational force in the direction of the arrow due to the rotation of the bolt 20, while the auxiliary lever 7 of the arm portion 3 of the main body 1 is engaged with the nut 22. Therefore, the main body 1 can use the nut 22 as a reaction force receiver via the auxiliary lever 7, and the main body 1 will not engage with the fixing nut 22 and be displaced from the illustrated state. Therefore,
Therefore, the nut 21 located within the fitting portion 2 is in a restrained state, and the nut 21 does not rotate during the fastening with the bolt 20.

As a result of the above, even if the bolt 20 is tightened with great force, the nut 21 during the tightening operation will not rotate, and component parts such as large pressure vessels and heat exchangers can be tightened without any problem. be able to.

After completion of the fastening, the main body 1 is removed from the state shown in the figure, but it is difficult to carry out the work as it is because the auxiliary lever 7 is firmly engaged with the fixed nut 22. Therefore, when the operating bolt 5 is moved in a direction away from the auxiliary lever 7, the auxiliary lever 7 is moved toward the recess 6 by the restoring force of the leaf spring 9. As a result, the auxiliary lever 7 becomes separated from the nut 22, and the mutual restraining force is eliminated. As a result, the main body 1 of the follow-up prevention fitting A becomes free, and by removing the fitting portion 2 from the nut 21, the main body 1 can be easily removed.

In the manner described above, the fastening work can be performed continuously by sequentially positioning the main body 1 so as to sequentially position a plurality of rows of bolts and nuts located in the circumferential direction as shown by the dashed lines.

In the above embodiment, the adjacent nut 22 that engages with the main body 1 is used to restrict the trailing rotation, but the present invention is not limited to this, and a protrusion located on the fastening surface can function as a reaction force receiver. You can do it like this.

[Effect of idea]

As explained above, in the present invention, the auxiliary lever is made to be freely retractable from the recess provided in the main body of the follow-up prevention fitting, and during work, the auxiliary lever is pushed out by the operation bolt and the head of the bolt that has been tightened is inserted. Alternatively, a nut or the like is used as a reaction force receiver, and after the tightening operation, the operating bolt is loosened and the auxiliary lever is housed in the recess of the main body by the leaf spring.
Therefore, after the tightening work, the auxiliary lever will be separated from the reaction force receiving member, and since only the fitting part of the main body of the metal fitting is fitted into the nut to be worked on, it is easy to tighten the main body to the nut. It can be removed from. Therefore, even after tightening a nut with a large torque, all you have to do is loosen the operating bolt, which is much easier to work with than the conventional method of using spanners as reaction force receivers, etc. improve.

[Brief explanation of drawings]

Fig. 1 is a front view of the tail rotation prevention metal fitting according to the present invention, Fig. 2 is a plan view taken from the - arrow direction in Fig. 1, and Fig. 3 is a front view showing an example of bolt/nut fastening work. . 1... Main body, 2... Fitting part, 3... Arm part,
4... Female screw hole, 5... Operation bolt, 6... Recess, 7... Auxiliary lever, 8... Pin, 9... Leaf spring, 20... Bolt, 21... Nut, A... Companion rotation Prevention fittings.

Claims (1)

[Scope of utility model registration request] A follow-up prevention metal fitting used when arranging bolts at pitch intervals and sequentially tightening or unscrewing nuts to each of these bolts,
A fitting part with a polygonal opening cross section into which the nut is removably fitted is provided at one end of the main body, and an arm part is extended in one direction from the fitting part to connect the tip of the arm and the center of the fitting part. A distance is formed to be longer than a pitch interval of the bolts, a recess is provided in a surface of the arm facing the rotational direction of the bolt, a proximal end is pivotally attached to the fitting part side in the recess, and a distal end side is provided. An auxiliary lever is provided that is capable of coming out and retracting from the recess, and an operating bolt is screwed onto the tip of the arm from a surface opposite to the mounting surface of the auxiliary lever. A nut anti-twisting fitting, characterized in that a plate spring is provided on the peripheral wall of the main body, the plate spring being pressable in a direction coming out of the recess and further biasing the auxiliary lever in the direction of the recess.