JP4845161B2 - Anti-rotation device for fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-rotation device for preventing rotation at the time of joining pipe joints used when joining fluid pipes such as water pipes and gas pipes.
[0002]
[Prior art]
Conventionally, when fluid pipes such as water pipes and gas pipes are joined with mechanical pipe fittings, the insertion part of the fluid pipe is inserted into the receiving part of the pipe joint, and the inner peripheral surface of the receiving part and the insertion part A packing ring was attached between the outer peripheral surface of the pipe, and a push ring that pushed in the packing and prevented its popping out was attached to the flange at the end of the pipe joint with bolts and nuts. The bolt used for attaching the press ring is a T-head bolt that prevents the bolt from rotating freely (co-rotation with the nut) when tightened with a nut. The head of the T-head bolt engages with the outer peripheral surface of the pipe joint or a detent provided on the outer peripheral surface to prevent the bolt from spinning around.
[0003]
[Problems to be solved by the invention]
When the nut is tightened when the fluid pipe is joined with the pipe joint, the friction force between the T-head bolt and the nut increases due to the reaction of pushing the push ring, and the packing and the outer circumference of the fluid pipe are coated with a lubricant. It gradually becomes larger than the frictional force. 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 pipe wrench, chain tongue, or other jig is hung on the pipe joint, and the pipe joint is fixed to perform the joining work. In addition to being damaged, the anticorrosion properties are impaired, and workability is poor, so a lot of work time is required.
[0004]
The problem to be solved by the present invention is to solve the above-mentioned problems, and is to provide a pipe joint rotation preventer that can easily prevent the pipe joint from rotating during fluid pipe joining.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the anti-rotation device for a pipe joint according to the present invention is characterized in that the head of the T-head bolt has one and the other long side surfaces having parallel surfaces extending perpendicular to the axis of the T-head bolt. A top surface portion having a surface perpendicular to the axis of the T-head bolt, both ends of the long side surface portion and the top surface portion; and And a flange provided at the end of the pipe joint by a nut screwed to the T-head bolt and the bolt portion of the T-head bolt. In addition, the anti-rotation tool for preventing the rotation of the pipe joint used when attaching the press ring,
A long side wall that can be opposed to one long side surface of the head of the T-head bolt, and both short side walls that can be opposed to both short side surfaces of the head of the T-head bolt; An engaging portion that is open to be opposed to the other long side surface side of the head and the top surface side of the T-head bolt;
It is characterized by comprising a lever portion continuously provided in the center of the long side wall.
Due to this feature, the engaging part of the anti-rotation tool is attached to the head of the T-head bolt, the operator grips the lever part, and a force is applied to the opposite side of the rotating tool (wrench, etc.) on the bolt. In addition, since the parallel pair of surfaces of the T-head bolt are prevented from rotating at the engaging portion, the pipe joint will not rotate even if the bolt is tightened, and the fluid pipe can be joined without damaging the pipe joint. Rotation of the pipe joint can be easily prevented.
[0006]
The engaging portion preferably includes a top wall having a surface that can face the top surface portion of the head of the T-head bolt.
In this way, when the engaging portion is attached to the T-head bolt, the engaging portion impedes engagement with the head of the T-head bolt and the outer peripheral surface of the pipe joint, or the detent provided protruding from the outer peripheral surface. In addition, when attaching the anti-rotation tool to the T-head bolt, workability is improved because it can be attached not only in the bolt axis direction but also in the direction perpendicular to the bolt axis.
Further, since the engaging portion is attached in contact with the three planes of the head of the T-head bolt, the engaging portion is stably engaged, and since the lever portion is provided in a direction perpendicular to the axis of the T-head bolt, torque The rotation can be prevented effectively with a small force.
[0007]
It is preferable that the short side wall of the engaging part is provided so as to be movable in the longitudinal direction in the engaging part .
If it does in this way, not only can one rotation prevention tool be combined with respect to the T head bolt from which a dimension differs, but a T head bolt and an engaging part can be fixed reliably.
[0008]
It is preferable that the lever portion extends in a crank shape in a direction opposite to a portion opened from the long side wall of the engaging portion .
In this way, the distance between the operator's hand holding the fastening tool (wrench, etc.) hung on the nut and the hand holding the lever part of the anti-rotation tool is increased, so the hands of each other will not collide. The tightening operation of the nut becomes safe and the movable range of the fastener is not limited, so that the tightening operation can be performed efficiently and workability is improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 and 2 show a first embodiment of the present invention, wherein 1 is an anti-rotation device of the present invention, 2 is an engaging portion that engages with a head 6 of a T-head bolt 5, and 3 is an operator. The lever part 4 which grips when operating the rotation prevention tool 1 has shown the connection part which protruded in the axial direction of the T head bolt 5. FIG.
[0011]
The engaging portion 2 is a top wall facing the four surfaces of the top surface portion 6a, both short side surface portions 6b and 6b, and the long side surface portion 6c facing upward in the head portion 6 of the T-head bolt 5 shown in FIG. 2a, short side walls 2b, 2b, and long side wall 2c, which is composed of four walls and includes a head 6 having no walls on the long side surface 6c side and the bolt side 7 side in the direction of the pipe joint 9 so as not to move. It is formed in a rectangular parallelepiped shape. The surface of each wall that abuts against the head 6 is formed in a plane parallel to each surface of the head 6.
[0012]
The length between the short side walls 2b and 2b is slightly larger than the length between the short side surface portions 6b and 6b of the head portion 6 of the T-head bolt 5, that is, the length in the longitudinal direction of the long side surface portion 6c. 6 is formed in such a length that it cannot rotate in the axial direction of the bolt part 7.
[0013]
The lever portion 3 is made of round steel, stands upright from the outer surface of the long side wall 2c of the engaging portion 2, and is parallel to the axis of the T-head bolt 5 and extends in the direction of the top surface portion 6a. It extends in the direction perpendicular to the axis of the T-head bolt 5 from the portion. The connecting portion 4 and the lever portion 3 are fixed to the engaging portion 2 so that the force applied to the lever portion 3 is transmitted.
[0014]
A grip that is thicker than other portions may be provided in the end portion direction of the lever portion 3 so that the operator can easily grip it.
[0015]
Next, how to use the above embodiment will be described with reference to FIG.
[0016]
a Apply a lubricant to the outer peripheral surface, and insert the insertion part of the fluid pipe 12 fitted with the push ring 10 and the packing 11 into the reception part of the pipe joint 9. The push ring 10 is moved to the pipe joint 9 side, and the packing 11 is inserted between the inner peripheral surface of the receiving portion and the outer peripheral surface of the insertion portion.
[0017]
b The bolt head 9 of the flange 9a formed on the outer peripheral surface end of the pipe joint 9 and the bolt hole of the press ring 10 are aligned, and the T head bolt 5 is inserted from the pipe joint 9 side and protrudes from the press ring 10. A nut 8 is attached to the tip of the bolt portion 7 of the bolt 5. T-head bolts 5 and nuts 8 are attached to all bolt holes, and the nuts 8 are tightened evenly by hand.
[0018]
c Fit the engaging portion 2 of the anti-rotation tool 1 to the head 6 of the T-head bolt 5, and attach a fastener 13 (spanner, ratchet wrench, etc.) to the nut 8.
[0019]
d Rotate the tightening tool 13 to tighten the nut 8 and simultaneously hold the lever portion 3 to apply force in the counter-rotating direction of the tightening tool 13 to prevent the pipe joint 9 from rotating.
[0020]
e Repeat steps c to d for the attached T-head bolt 5 and evenly tighten the nuts 8 to complete the joining operation.
[0021]
Engagement portions 2 formed parallel to and flat on each surface portion are engaged with the top surface portion 6a, both short side surface portions 6b and 6b, and the long side surface portion 6c formed on the flat surface of the head 6 of the T-head bolt 5. Therefore, the operator can hold the lever portion 3 of the anti-rotation device 1 provided in the direction perpendicular to the axis of the T-head bolt 5 and tighten the fastener 13 (spanner) on the bolt. , Ratchet wrench, etc.) force can be applied to the opposite side of the rotation direction, torque can be applied effectively, and the pipe joint will not rotate even if the bolt is tightened, without damaging the pipe joint The rotation of the pipe joint during the joining of the fluid pipes can be easily prevented.
[0022]
Since the lever part 3 is separated from the fastening tool 13 by the connecting part 4, it is safe because it does not collide with the hand holding the lever part 3 even if the fastening tool 13 is repeatedly moved. Since the movable range is not limited, the tightening operation can be performed efficiently.
[0023]
FIG. 4 shows a second embodiment of the present invention, in which the engaging portion 2 is constituted by three walls.
[0024]
Unlike the first embodiment, the lever portion 3 is formed of a hollow pipe, and the connecting portion 4 is omitted, and the lever portion 3 is directly connected in the direction perpendicular to the axis of the T-head bolt 5 from the outside of the long side wall 2c of the engaging portion 2. ing.
[0025]
The engaging portion 2 is constituted by three walls of the short side walls 6b, 6b of the T-head bolt 5 and the short side walls 2b, 2b and the long side wall 2c facing the long side face 6c facing upward, It is formed in a substantially U-shape that is vertically long in plan view.
[0026]
The length between the short side walls 2b and 2b is the same as that of the first embodiment from the length between the short side surface portions 6b and 6b of the head 6 of the T-head bolt 5, that is, the length in the longitudinal direction of the long side surface portion 6c. The head 6 is formed to have a length that cannot be rotated in the axial direction of the bolt portion 7.
[0027]
The second embodiment is lighter and easier to handle. Further, since the lever portion 3 is provided upright on the long side wall 2c facing the long side surface portion 6c of the head portion 6, the engaging portion 2 is attached to the T head bolt 5 and the lever portion 3 is attached to the T head bolt 5 When pressed to the side, the force is directly applied to the long side surface portion 6 c, and the engaging portion 2 is not detached from the T-head bolt 5 because the rotational force in the direction opposite to the bolt portion 7 does not act on the engaging portion 2.
[0028]
The anti-rotation tool 1 of the second embodiment can also be used in the same manner as in the first embodiment to prevent the pipe joint 9 from rotating when the fluid pipe 12 is joined to the pipe joint 9.
[0029]
FIG. 5 shows a third embodiment of the present invention, in which the short side wall of the engaging portion 2 is movably provided.
[0030]
The engaging portion 2 includes a top wall 2a, short side walls 2b, 2b, a long side wall 2c, and a moving short side wall 2d, which are configured in substantially the same manner as in the first embodiment.
[0031]
The moving short side wall 2d is rotatably engaged with the groove at the tip of the moving bolt 14 screwed into one short side wall 2b, is movable along the communication groove 2e provided in the long side wall 2c, and falls. Is attached to prevent.
[0032]
The moving short side wall 2d moves in the longitudinal direction within the engaging portion 2 by turning the moving bolt 14, and the distance between the moving short side wall 2d and the other short side wall 2b can be adjusted.
[0033]
A fall prevention portion 15 is provided continuously from the end portion of the top wall 2a so as to protrude outward in the opposite direction of the bolt portion 7.
[0034]
The lever portion 3 is made of round steel, and the shaft of the T-head bolt 5 from the end of the connecting portion 4 provided upright parallel to the shaft of the T-head bolt 5 from the outer surface of the top wall 2a of the engaging portion 2. It extends in a right angle direction.
[0035]
Similarly to the first embodiment, the anti-rotation device 1 of the third embodiment is attached to the head 6 of the T-head bolt 5 and used to prevent the pipe joint 9 from rotating when the fluid pipe 12 is joined to the pipe joint 9. can do.
[0036]
Since the inner length of the engaging portion 2 can be adjusted in accordance with the length of the head 6 of the T-head bolt 5 used for the pipe joint 9, it is the same for various sizes of the T-head bolt 5. The anti-rotation tool 1 can be used.
[0037]
Since the lever portion 3 is provided at the end of the connecting portion 4, a moment is applied to the engaging portion 2 when the lever portion 3 is attached to the T-head bolt 5 and the lever portion 3 is pushed in the direction of the T-head bolt 5. Although the joint portion 2 tries to rotate in the direction away from the head 6, the end portion of the fall prevention portion 15 abuts against the outer peripheral surface of the pipe joint 9 to prevent the engagement portion 2 from coming off from the T-head bolt 5. be able to.
[0038]
While the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to this.
[0039]
In the third embodiment, the moving short side wall 2d is provided separately from the short side wall 2b, but one short side wall 2b may be used as the moving short side wall 2d.
[0040]
【The invention's effect】
According to the present invention, the engaging portion of the rotation prevention tool is attached to the head of the T-head bolt, the operator grips the lever portion, and on the opposite side to the rotation direction of the fastening tool (wrench etc.) hung on the bolt. Even if force is applied, the parallel pair of T-head bolts are prevented from rotating by the engaging part, so the pipe joint will not rotate even if the bolt is tightened, and the fluid pipe can be joined without damaging the pipe joint. Rotation of the pipe joint at the time can be easily prevented.
[0041]
According to the invention of claim 2, when the engaging portion is attached to the T-head bolt, the engaging portion is related to the head of the T-head bolt and the outer peripheral surface of the pipe joint, or the detent provided to protrude from the outer peripheral surface. In addition, when the anti-rotation tool is attached to the T-head bolt, the workability can be improved because it can be attached not only in the bolt axis direction but also in the direction perpendicular to the bolt axis.
Further, since the engaging portion is attached in contact with the three planes of the head of the T-head bolt, the engaging portion is stably engaged, and since the lever portion is provided in a direction perpendicular to the axis of the T-head bolt, torque The rotation can be prevented effectively with a small force.
[0042]
According to the invention of claim 3, not only can one rotation preventing tool be used for T-head bolts having different dimensions, but also the T-head bolt and the engaging portion can be securely fixed.
[0043]
According to invention of Claim 4, since the distance of the operator's hand holding the fastener (wrench etc.) hung on the nut and the hand holding the lever part of the rotation preventing tool is separated, the hands of each other collide with each other. Thus, the nut tightening operation becomes safe and the movable range of the fastener is not limited, so that the tightening operation 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 an explanatory cross-sectional view during 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 an anti-rotation 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 Anti-rotation tool 2 Engagement part 2a Top wall 2b Short side wall 2c Long side wall 2d Movement short side wall 2e Communication groove 3 Lever part 4 Connection part 5 T head bolt 6 Head 6a Top surface part 6b Short side part 6c Long side part 7 Bolt Part 8 Nut 9 Fitting 9a Flange 10 Pusher 11 Packing 12 Fluid pipe 13 Fastener 14 Moving bolt 15 Fall prevention part

Claims (4)

The head of the T-head bolt has one and the other long side surfaces having parallel surfaces extending perpendicularly to the axis of the T-head bolt, and the long side sides of the both long side portions are both sides, and the T head A top surface portion having a surface perpendicular to the axis of the bolt, and a short side surface portion that forms both ends of the long side surface portion and both ends of the top surface portion and has a surface parallel to the axis of the T-head bolt. Rotation for preventing rotation of the pipe joint used when attaching a press ring to a flange provided at an end of the pipe joint by a nut screwed to the bolt part of the T-head bolt and the T-head bolt Prevention tool,
A long side wall that can be opposed to one long side surface of the head of the T-head bolt, and both short side walls that can be opposed to both short side surfaces of the head of the T-head bolt; An engaging portion that is open to be opposed to the other long side surface side of the head and the top surface side of the T-head bolt;
An anti-rotation device comprising a lever portion provided continuously at the center of the long side wall. The anti-rotation device according to claim 1, wherein the engaging portion includes a top wall having a surface that can face the top surface portion of the head of the T-head bolt.   The rotation prevention tool according to claim 1 or 2, wherein a short side wall of the engagement portion is provided so as to be movable in a longitudinal direction in the engagement portion.   The rotation preventing tool according to any one of claims 1 to 3, wherein the lever portion extends in a crank shape in a direction opposite to a portion opened from a long side wall of the engagement portion.

Images