JP2002264028A - Tool for preventing rotation of pipe fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for preventing rotation of a pipe fitting allowing easily preventing rotation of the fitting when connecting fluid pipes. SOLUTION: An engaging part 2 of the tool 1 is mounted on a head part 6 of a T-head bolt 5 and an operator grips a lever part 3. Even when the operator applies force to the opposite rotation direction of a tightening tool (wrench, etc.), put on the bolt 5, rotation of a pair of faces in parallel of the bolt 5 is locked by the engaging part, thereby the pipe fitting is not rotated even if the bolt is tightened to easily prevent rotation of the pipe fitting when connecting the fluid pipes without damaging the pipe fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation preventing device for preventing rotation at the time of joining a pipe joint used for joining a fluid pipe such as a water pipe or a gas pipe.

[0002]

2. Description of the Related Art Conventionally, when a fluid pipe such as a water pipe or a gas pipe is joined by a mechanical pipe joint, an insertion portion of the fluid pipe is inserted into a socket of the pipe joint and an inner periphery of the socket is inserted. A packing was mounted between the surface and the outer peripheral surface of the insertion portion, and the packing was pushed in, and a pressing ring for preventing the packing from popping out was attached to the flange at the end of the pipe joint with bolts and nuts. As a bolt used for attaching the pressing wheel, a T-head bolt is used which prevents the bolt from turning idle (co-rotation with the nut) when tightened with a nut. The T-head bolt has its head engaged with the outer peripheral surface of the pipe joint or a detent provided to protrude from the outer peripheral surface to prevent the bolt from idling.

[0003]

When the nuts are tightened when the fluid pipes are joined with the pipe joint, the frictional force between the T-head bolt and the nut increases due to the reaction of pressing the pressing ring, and the lubricant is applied. It gradually becomes larger than the frictional force between the mounted packing and the outer peripheral surface of the fluid pipe. Therefore, when the nut is further tightened, the T-head bolt also rotates in the rotation direction of the nut, and accordingly, the pipe joint engaged with the head of the T-head bolt also rotates with respect to the fluid pipe. When the nut rotates, the nut cannot be tightened, and the joining of the fluid pipes cannot be completed. In order to prevent such a situation, a jig such as a pipe wrench or a chain tongue is hung on the pipe joint, and the pipe joint is fixed and the joining operation is performed. However, not only the corrosion resistance was impaired due to the damage but also the workability was poor, so that much work time was required.

An object of the present invention is to solve the above-mentioned problems, and to provide a pipe joint rotation preventing device which can easily prevent the rotation of the pipe joint at the time of fluid pipe joining. It is in.

[0005]

In order to solve the above-mentioned problems, a rotation preventing device for a pipe joint according to the present invention attaches a pressing ring or the like to a flange provided at an end of the pipe joint with a T-head bolt / nut. An anti-rotation device for preventing rotation of the pipe joint used at the time of fitting, wherein an engagement portion abutted so as to fit at least a pair of parallel surfaces formed on the head of the T-head bolt; It is characterized by comprising a lever portion extending in a direction substantially perpendicular to the axis of the bolt and connected to the engaging portion. With this feature, the engaging portion of the rotation preventing device is attached to the head of the T-head bolt, the operator grips the lever portion, and applies a force in the direction opposite to the rotation direction of the fastener (wrench or the like) hooked on the bolt. In addition, since the pair of parallel faces of the T-head bolt are prevented from rotating at the engagement portion, the pipe joint does not rotate even when the bolt is tightened, and the pipe joint is not damaged without damaging the pipe joint. , The rotation of the pipe joint at the time can be easily prevented.

It is preferable that the engaging portion has a shape in which the other portions are open except walls facing the top surface portion, both short side portions, and the upper outer surface portion of the T-head bolt. With this configuration, when the engaging portion is attached to the T-head bolt, the engaging portion hinders engagement with the head of the T-head bolt and the outer peripheral surface of the pipe joint or a detent provided on the outer peripheral surface. In addition, when the anti-rotation device is attached to the T-head bolt, it can be attached not only in the bolt axis direction but also in the direction perpendicular to the bolt axis, thereby improving workability. In addition, since the engaging portion is attached in contact with the three planes of the head of the T-head bolt, the engagement is stable, and the lever portion is provided in a direction perpendicular to the axis of the T-head bolt, so that the torque is reduced. Can rotate effectively with less force.

[0007] It is preferable that at least a part of the short side wall of the engaging portion is provided with a movable short side wall which can be moved right and left. In this case, not only one anti-rotation device can be used for T-head bolts having different dimensions, but also the T-head bolt and the engaging portion can be securely fixed.

Preferably, the lever portion extends substantially in a crank shape from the base of the engaging portion so that a predetermined distance can be obtained between the lever portion and the fastener. By doing so, the distance between the hand of the worker holding the fastening tool (wrench or the like) hung on the nut and the hand holding the lever portion of the rotation preventing tool is large, so that the hands do not hit each other, The tightening operation of the nut becomes safe and the movable range of the tightening tool is not limited, so that the tightening operation can be performed efficiently and the workability is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention, in which 1 is an anti-rotation device of the present invention, 2 is an engaging portion which engages with a head 6 of a T-head bolt 5, Denotes a lever portion which is gripped by the operator when operating the rotation preventing device 1, and 4 denotes a connecting portion of the T-head bolt 5 which protrudes in the axial direction.

The engaging portion 2 is opposed to four surfaces of a top surface portion 6a, both short side surface portions 6b, 6b, and a long side surface portion 6c facing upward in the head 6 of the T-head bolt 5 shown in FIG. The head 6 has four walls, namely, a top wall 2a, short side walls 2b, 2b, and a long side wall 2c. The head 6 has no walls on the long side portion 6c side and the bolt portion 7 side in the pipe joint 9 direction. It is formed in a hollow rectangular parallelepiped shape. The surface of each wall abutting on the head 6 is formed in a plane parallel to each surface of the head 6.

The length between the short side walls 2b, 2b is slightly larger than the length between the two short side portions 6b, 6b of the head 6 of the T-head bolt 5, that is, the length in the longitudinal direction of the long side portion 6c. ,
The head 6 is formed to a length that cannot rotate in the axial direction of the bolt portion 7.

The lever portion 3 is made of round steel, and the engaging portion 2
And extending in the direction perpendicular to the axis of the T-head bolt 5 from the end of the connecting portion 4 provided in parallel with the axis of the T-head bolt 5 and extending in the direction of the top surface 6a. I have. The connecting portion 4 and the lever portion 3 are fixed to the engaging portion 2 so that a force applied to the lever portion 3 is transmitted.

A grip which is thicker than other portions may be provided in the direction of the end of the lever portion 3 so that an operator can easily grip it.

Next, the procedure for using the above embodiment is shown in FIG.
Will be described.

A A lubricant is applied to the outer peripheral surface, and the insertion portion of the fluid pipe 12 in which the pressing ring 10 and the packing 11 are fitted is inserted into the reception portion of the pipe joint 9. The pressing ring 10 is moved toward the pipe joint 9 to insert the packing 11 between the inner peripheral surface of the receiving portion and the outer peripheral surface of the insertion portion.

(B) The bolt hole of the flange 9a formed at the end of the outer peripheral surface of the pipe joint 9 and the bolt hole of the push ring 10 are aligned, and the T-head bolt 5 is inserted from the pipe joint 9 side.
The nut 8 is attached to the tip of the bolt portion 7 of the T-head bolt 5 protruding from the bolt. Attach the T-head bolt 5 and the nut 8 to all the bolt holes, and tighten the nut 8 evenly by hand.

C The engaging portion 2 of the anti-rotation device 1 is fitted to the head 6 of the T-head bolt 5, and a fastener 13 (spanner, ratchet wrench, etc.) is attached to the nut 8.

D. At the same time as turning the fastener 13 to tighten the nut 8, the lever 3 is grasped and a force is applied in the counter-rotating direction of the fastener 13 to prevent the rotation of the pipe joint 9.

E With respect to the attached T-head bolt 5, c
To d, and the nut 8 is evenly tightened to complete the joining operation.

Engaging portions formed on the top surface 6a, both short side surfaces 6b, 6b, and the long side surface 6c formed in the plane of the head 6 of the T-head bolt 5 in parallel with each surface and in a plane. 2 can be stably mounted because it is engaged.
The operator grips the lever portion 3 of the rotation preventing device 1 provided in a direction perpendicular to the axis of
(Spanner, ratchet wrench, etc.) The force can be applied to the opposite side of the rotation direction, so that the torque can be effectively applied, and even if the bolt is tightened, the pipe joint will not rotate and damage the pipe joint Thus, rotation of the pipe joint at the time of joining the fluid pipes can be easily prevented.

The lever 3 is connected to the fastener 13 by the connecting part 4.
Is safe because even if the fastener 13 is repeatedly moved, it does not hit the hand holding the lever part 3 and is safe. Also, since the movable range of the fastener 13 is not limited, tightening is efficient. Work can be done.

FIG. 4 shows a second embodiment of the present invention, in which the engaging portion 2 is constituted by three walls.

The lever portion 3 is constituted by a hollow pipe,
Unlike the first embodiment, the connecting portion 4 is omitted, and the engaging portion 2 is directly connected from the outside of the long side wall 2c in the direction perpendicular to the axis of the T-head bolt 5.

The engaging portion 2 is provided with two short side portions 6 of the T-head bolt 5.
b, 6b, and three walls of the short side walls 2b, 2b and the long side wall 2c opposed to the long side surface portion 6c facing upward, and are formed in a substantially U-shape which is vertically long in a plan view.

The length between the short side walls 2b, 2b is the same as in the first embodiment.
The length between them, that is, the length of the long side surface portion 6c in the longitudinal direction is slightly larger, and the head portion 6 is formed so as not to rotate in the axial direction of the bolt portion 7.

The second embodiment is light in weight and easy to handle. Since the lever 3 is provided upright on the long side wall 2c facing the long side surface 6c of the head 6, the engaging portion 2 is attached to the T-head bolt 5 and the lever 3
Is pushed to the T-head bolt 5 side, the force is directly applied to the long side surface portion 6c, and the rotating force in the direction of the anti-bolt portion 7 does not act on the engaging portion 2; It does not come off.

The antirotation device 1 of the second embodiment can be used in the same manner as the first embodiment to prevent the rotation of the pipe joint 9 when the fluid pipe 12 is joined to the pipe joint 9.

FIG. 5 shows a third embodiment of the present invention, in which the short side wall of the engaging portion 2 is movably provided.

The engaging portion 2 is composed of a top wall 2a, short side walls 2b, 2b, a long side wall 2c and a moving short side wall 2d which are constructed in substantially the same manner as in the first embodiment.

The moving short side wall 2d is rotatably engaged with a groove at the tip of a moving bolt 14 screwed into one short side wall 2b, and is movable along a communication groove 2e provided in the long side wall 2c. And it is attached so that it is prevented from falling.

The moving short side wall 2d is moved in the longitudinal direction in the engaging portion 2 by turning the moving bolt 14, so that the distance between the moving short side wall 2d and the other short side wall 2b can be adjusted.

An overturn prevention portion 15 is provided continuously protruding outward from the end of the top wall 2a in a direction opposite to the bolt portion 7.

The lever part 3 is made of round steel, and the engaging part 2
The top wall 2a extends from the end of a connecting portion 4 provided upright in parallel with the axis of the T-head bolt 5 in the direction perpendicular to the axis of the T-head bolt 5.

The anti-rotation device 1 of the third embodiment is also used by attaching it to the head 6 of the T-head bolt 5 as in the first embodiment. Rotation can be prevented.

The head 6 of the T-head bolt 5 used for the pipe joint 9
The length of the inside of the engaging portion 2 can be adjusted according to the length of the T-head bolt 5 so that the same rotation preventing device 1 can be used for various sizes of T-head bolts 5.

Since the lever part 3 is provided at the end of the connecting part 4, when the lever part 3 is attached to the T-head bolt 5 and the lever part 3 is pushed in the direction of the T-head bolt 5, a moment acts on the engaging part 2. As a result, the engaging portion 2 attempts to rotate in a direction to come off the head 6, but the end of the fall prevention portion 15 comes into contact with the outer peripheral surface of the pipe joint 9 and the engaging portion 2 comes off from the T-head bolt 5. Can be prevented.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration of the present invention is not limited to this.

In the third embodiment, the moving short side wall 2d is provided separately from the short side wall 2b.
May be the moving short side wall 2d.

[0040]

According to the present invention, the engaging portion of the anti-rotation device is attached to the head of the T-head bolt, the operator grips the lever portion, and rotates the fastener (wrench or the like) on the bolt. Even if a force is applied in the opposite direction, the pair of parallel faces of the T-head bolt are prevented from rotating at the engagement part, so even if the bolt is tightened, the pipe joint will not rotate and damage the pipe joint. Therefore, rotation of the pipe joint at the time of joining the fluid pipes can be easily prevented.

According to the second aspect of the present invention, when the engaging portion is attached to the T-head bolt, the engaging portion and the outer peripheral surface of the head of the T-head bolt and the outer peripheral surface of the pipe joint, or a protruding portion provided on the outer peripheral surface. Workability is improved because the anti-rotation device can be mounted not only in the bolt axis direction but also in the direction perpendicular to the bolt axis without disturbing the engagement with the stopper and when attaching the rotation preventing tool to the T-head bolt. In addition, since the engaging portion is attached in contact with the three planes of the head of the T-head bolt, the engagement is stable, and the lever portion is provided in a direction perpendicular to the axis of the T-head bolt, so that the torque is reduced. Can rotate effectively with less force.

According to the third aspect of the present invention, T having different dimensions is used.
Not only can one rotation preventing device be used for the head bolt, but also the T head bolt and the engaging portion can be securely fixed.

According to the fourth aspect of the present invention, the distance between the hand of the worker holding the fastening tool (wrench or the like) hung on the nut and the hand holding the lever portion of the rotation preventing tool is large, so that the two hands are separated from each other. There is no collision with the hand, the tightening work of the nut is safe, and there is no limitation on the movable range of the fastener, so that the tightening work can be performed efficiently and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotation preventing device according to a first embodiment of the present invention.

FIG. 2 is also an explanatory sectional view at the time of use.

FIG. 3 is a perspective view of a T-head bolt used for a pipe joint.

4A is a front view and FIG. 4B is a plan view of a rotation preventing device according to a second embodiment of the present invention.

5A is a front view and FIG. 5B is a side view of a rotation preventing device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation prevention tool 2 Engagement part 2a Top wall 2b Short side wall 2c Long side wall 2d Moving short side wall 2e Communication groove 3 Lever part 4 Communication part 5 T head bolt 6 Head 6a Top surface part 6b Short side surface part 6c Long side surface part 7 Bolt Part 8 Nut 9 Fitting 9a Flange 10 Press ring 11 Packing 12 Fluid pipe 13 Fastener 14 Moving bolt 15 Fall prevention part

Claims (4)

[Claims] 1. A flange provided at an end of a pipe joint,
An anti-rotation device for preventing rotation of the pipe joint used when attaching a pressing ring or the like with a T-head bolt / nut,
An engaging portion formed at the head of the T-head bolt and abutting at least a pair of parallel surfaces, and extending in a direction substantially perpendicular to the axis of the T-head bolt and connected to the engaging portion; An anti-rotation device comprising: a lever portion provided. 2. The rotating member according to claim 1, wherein the engaging portion has a shape in which the other portion is opened except for a wall facing a top surface portion, both short side portions, and an upper outer surface portion of the T-head bolt. Protective gear. 3. A moving short side wall which is movable at least to the left and right is provided at a part of the short side wall of the engaging portion.
Or the anti-rotation device according to 2. 4. The lever according to claim 1, wherein the lever portion extends substantially in a crank shape from a root of the engaging portion, so that a predetermined interval can be obtained between the lever portion and the fastener. An anti-rotation device described in Crab.