JP3785446B2 - Pipe fitting pre-tightening jig - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pipe joint preliminary tightening jig for facilitating a nut tightening operation when assembling a pipe joint.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, as a pipe joint, the pipe insertion portion into the inner circumference of the one end, screwed to the outer periphery a male thread tubular joint member formed respectively, the tube to be inserted into the tube insertion portion of the joint member, the male thread of the joint hand member clamping is secured thereto are fastened to the tube with stopped sandwiched between the inward flange of the joint member and the nut by fitting is and nuts tightened around the tube projecting from the inwardly flanged nut and tube insertion portion is What consists of a sleeve is known.
[0003]
The assembly of the pipe joint has been performed at the work site of the piping work by tightening the nut by hand and then further tightening it by, for example, 5/4 rotation with a spanner or the like. However, there are places where it is difficult to rotate the wrench once or places where it is difficult to reach at the work site of the piping work, and the nut tightening work is extremely difficult in such places.
[0004]
An object of the present invention is to provide a pipe joint pre-fastening jig that facilitates nut tightening work at a work site of piping work by fastening a fastening sleeve to the pipe before assembling the pipe joint.
[0005]
[Means for Solving the Problems]
Pipe joint preswaged jig according to the present invention, the tube insertion part into the inner periphery of the one end, the tubular coupling member external thread in the outer periphery are formed respectively, the tube to be inserted into the tube insertion portion of the joint member, the joint hand member clamped to the tube together with the stopped sandwiched between the inward flange of the joint member and the nut by fitting is and nuts tightened around the tube projecting from the inwardly flanged nut and tube insertion portion that is screwed to the external thread Before assembling a pipe joint comprising a fastening sleeve fixed to this, it is a jig for fastening the fastening sleeve to the pipe, and is formed on the tubular head formed at one end, the outer periphery of the tubular head A male screw, a tube insertion portion formed on the inner periphery of the tubular head portion, an inward protruding stopper portion formed at the back of the tube insertion portion, and an inwardly inclined tapered surface formed at the tip of the tube insertion portion Jig body , It is screwed to the male screw of the tubular head made more the inward flange nut for tightening the fitted clamping sleeve around the tube is inserted into the tube insertion portion protrudes from tube insertion portion into the tube It is.
[0006]
The aforementioned jig body, there may be a grip bar is attached.
[0007]
[Action]
The pipe joint pre-fastening jig of the present invention is used before assembling the pipe joint. The pre-tightening work is performed by inserting a pipe into the pipe insertion portion and placing a fastening sleeve around the pipe protruding from the tubular head. The nut is inserted into the male screw from the pipe side and tightened by hand, and then the nut is tightened by, for example, 3/4 rotation with a spanner or the like. When tightening with a spanner or the like, hold the jig body with a vise or the like and fix it. By this preliminary fastening, the sleeve is clamped between the pipe insertion portion and the inward flange of the nut, and is fastened to the pipe and fixed to the pipe.
[0008]
After pre-tightening, loosen the nut and temporarily remove the tube with the sleeve fixed from the jig, carry it to the work site for piping work, insert it into the pipe insertion part of the tubular joint member , and insert the nut from the pipe side to the joint member After fitting onto the male screw and tightening by hand, the nut is tightened with a spanner or the like to assemble the pipe joint. Since the tightened portion of the nut by a spanner or the like at the time of preliminary tightening can be tightened by hand, the amount of tightening of the nut by the spanner or the like at the time of assembling the pipe joint is sufficient, for example, 1/2 turn.
[0009]
In the case where the grip bar is attached to the jig body, the preliminary tightening is performed by holding the grip bar by hand and tightening the nut with a spanner or the like.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In the following description, left and right and top and bottom refer to left and right and top and bottom in FIG. 2 , respectively.
[0011]
FIG. 4 shows an example of a pipe joint that is pre-tightened by the pipe joint pre-fastening jig (21) of the present invention.
[0012]
This pipe joint includes a tubular joint member (1) into which the pipe (8) is inserted from the right end side, and first and second fittings fitted around the pipe (8) protruding from the right end side of the joint member (1). A tightening sleeve (3) (4) and a nut (5) for tightening the tightening sleeve (3) (4) to fix the pipe (8) to the joint member (1) are provided.
[0013]
A tube insertion portion (12) is formed on the inner periphery of the right end portion of the tubular joint member (1), and a screw (10) is formed on the outer periphery thereof. A stopper portion (12a) projecting inward is formed at the left end portion of the tube insertion portion (12), and a tapered surface (12b) inclined inward is formed at the right end portion.
[0014]
An annular groove (13) is formed on the inner periphery of the portion near the left end of the first sleeve (3), an outward flange portion (14) is formed on the outer periphery of the right end portion, and an inwardly tapered surface is formed on the inner periphery of the right end portion. Has been. The left end portion of the first sleeve (3) slightly enters the inside of the tapered surface (12a) at the right end of the tube insertion portion (12). The left end surface of the second sleeve (4) is a tapered surface inclined outward. An outward flange portion (15) is formed on the outer periphery of the right end portion of the second sleeve (4), and the right end surface is a tapered surface slightly inclined outward. The left end surface of the second sleeve (4) is in close contact with the tapered surface of the first sleeve (3). A small diameter part (17) having a smaller inner diameter than the left part is formed on the inner periphery of the right end part of the nut (5), and an inward flange part (18) is formed on the right end part part of the small diameter part (17). Has been. A female screw (16) is formed on the inner periphery of the nut (5) on the left end side, and this is screwed onto the male screw (10) of the tubular head (6). The left side surface of the inward flange portion (18) of the nut (5) is slightly inclined inward, and this surface is in close contact with the taper surface at the right end of the second sleeve (4).
[0015]
In the above pipe joint, after tightening the nut (5) by hand and further tightening with a spanner, the two sleeves (3) and (4) are connected to the joint member (1) and the flange (18) of the nut (5). Thus, the two sleeves (3) and (4) are fastened, and the pipe (8) is fixed to the joint member (1). In this pipe joint, the tightening amount of the nut (5) by the spanner is 5/4 rotation. Assembling of pipe joints is performed at the work site of piping work, but at the work site of piping work, there are places where it is difficult to rotate the spanner or where it is difficult to reach, and in such places, It was very difficult to rotate the nut (5) 5/4 with a spanner.
[0016]
The pipe joint pre-fastening jig (21) shown in FIG. 1 has a tightening sleeve (3) (4) before assembling the pipe joint in order to facilitate the nut tightening work at the piping work site. ) a jig for keeping tightening the, the right end of the generally cylindrical jig main body (22), the tubular joint members (1) tube shape was made and the right end portion of the same shape of that shown in FIG. 4 in which the head portion (23) is formed. When the pipe joint pre-fastening jig (21) is not used, a cap (24) in which a female thread is formed is put on the tubular head (23).
[0017]
The tool joint pre-tightening jig (21) has a tool engaging part (25) having two parallel planes by cutting both side surfaces of the jig main body (22) from the left end part to the right end part. Is formed. The right end portion of the jig body (22) which is not cut (22a) plays the role of fall prevention stopper again to hold the jig body (22) to the device.
[0018]
FIG. 2 shows a longitudinal section when the fastening sleeves (3) and (4) are fastened to the pipe (8) using the pipe joint pre-fastening jig (21) of FIG. 1, as shown in detail in FIG. In addition, a tube insertion portion (32) having the same shape as the tube insertion portion (12) of the tubular joint member (1) is formed on the inner periphery of the tubular head portion (23) of the pipe joint pre-fastening jig (21). A male screw (30) having the same shape as the male screw (10) of the tubular joint member (1) is formed on the outer periphery. An inward projecting stopper portion (32a) is formed at the left end portion of the tube insertion portion (32), and an inwardly inclined tapered surface (32b) is formed at the right end portion.
[0019]
In the above embodiment, the pipe joint pre-fastening jig (21) is made of special steel, and the cap (24) is made of brass.
[0020]
Preswaged by pipe joint preswaged fixture (21) is performed as follows.
[0021]
First, the tool engaging part (25) is grasped with a vise or the like to fix the jig body (22), and the pipe (8) hits the stopper part (32a) against the pipe insertion part (32) of the tubular head part (23). Insert until Next, the first sleeve (3) and the second sleeve (4) are sequentially fitted around the tube (8) protruding to the right side from the tubular head (23). Next, the nut (5) is screwed onto the male screw (30) of the tubular head (23) and tightened by hand. Finally, the nut (5) is rotated, for example, 3/4 with a spanner or the like. As a result, the first and second sleeves (3) and (4) are tightened to ensure the sealing performance between the first and second sleeves (3) and (4) and the pipe (8). Two sleeves (3) and (4) are fixed to the pipe (8).
[0022]
When this preliminary tightening is finished, loosen the nut (5) and remove the pipe (8) with the sleeve (3) (4) fixed from the preliminary tightening jig (21), and place it at the work site for piping work. And then inserting it into the tubular joint member (1), fitting the nut (5) to the joint member (1) from the pipe (8) side and tightening it by hand, and then tightening it with a spanner etc. assemble. The nut (5) can be tightened by hand with a wrench at the time of preliminary tightening, so the amount of tightening of the nut (5) with the wrench at the time of assembling the fitting is sufficient, for example, about 1/2 turn. As a result, a pipe joint having a sufficient sealing property can be obtained. Therefore, it is possible to easily perform nut tightening work in a place where there is no space for rotating the spanner or where it is difficult to reach.
[0023]
In the above embodiment, the jig body (22) has a substantially cylindrical shape, but it may have a rectangular column shape or a hexagonal column shape. The tool engaging portion (25) is formed by cutting both side surfaces of the jig body (22) , but the shape and forming method of the tool engaging portion are not limited to this, and can be changed as appropriate.
[0024]
The nut (5) used at the time of preliminary tightening in the above embodiment is the same as that used for the pipe joint, but a nut exclusively for preliminary tightening can also be used. In this case, the female screw of the nut and the male screw of the pre-fastening jig need not match the male screw (10) of the tubular joint member (1).
[0025]
FIG. 3 shows another embodiment of the pipe joint pre-fastening jig according to the present invention.
[0026]
As shown in the figure, the pipe joint preswaged jig (41) is the right end tube Joatama of the substantially prismatic jig body (42) (23) is formed, the jig body (42 ) Is attached with a grip bar (43) extending vertically. Since the tubular head portion (23) has the same shape as in the above embodiment, the description thereof is omitted. When the pipe joint pre-fastening jig (41) is not used, a cap (24) formed with a female thread is put on the tubular head (23).
[0027]
A male screw (44) is formed at the upper end of the grip rod (43), and a vertical female screw (45) is formed on the jig body (42) to match the male screw (44). 43) is made detachable. At the lower end of the grip rod (43), a grip portion (43a) is formed which is prevented from slipping such as knurling.
[0028]
In the above embodiment, the jig body (42) is made of special steel, and the grip bar (43) is made of carbon steel. The jig body (42) has a substantially prismatic shape, but may be of other shapes. Further, although the grip rod (43) is detachable, it may not be detachable. By detachable, even when the shape of the tubular head uses a plurality of different pre-clamping fixture, able to work by one of the handlebar (43).
[0029]
【The invention's effect】
According to the pipe joint preliminary fastening jig of the present invention, the sleeve can be fixed to the pipe before the pipe joint is assembled . Tightening amount of nut by a wrench or the like during the pre備締first is, it is possible to tighten by hand, at the time of pipe joint assembly, tightening of the nut by a wrench or the like, for example, a sufficient half turn, rotates one spanner The nut tightening operation can be easily performed even in a place where there is no space to allow or where it is difficult to reach.
[0030]
When the grip body is attached to the jig body, preliminary tightening can be done by holding the grip bar by hand and tightening the nut with a spanner, etc., so there is no need for a body fixing jig such as a vise. , Pipe joint pre-tightening work can be done at any site.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a pipe joint pre-fastening jig according to the present invention.
FIG. 2 is a longitudinal sectional view showing a state when preliminary tightening is performed using the jig of FIG.
FIG. 3 is a perspective view showing another embodiment of the pipe joint pre-fastening jig according to the present invention.
FIG. 4 is a longitudinal sectional view showing an example of a pipe joint preliminarily tightened by a pipe joint pre-tightening jig according to the present invention.
[Explanation of symbols]
(1) Tubular joint member
(3) (4) Tightening sleeve
(5) Nut
(8) Tube
(10) Male thread
(12) Pipe insertion part
(18) Inward flange
(21) (41) Pipe joint pre-tightening jig
(22) (42) Jig body
(23) Tubular head
(30) Male thread
(32) Pipe insertion part
(32a) Stopper
(32b) Tapered part
(43) Grip stick

Claims (2)

Tube insertion portion into the inner circumference of the one end, the tubular joint member formed with a male respectively on the outer periphery, the tube to be inserted into the tube insertion portion of the joint member, joint hands with inward flanges that are screwed to the male screw member pipe joint made of clamping sleeve is secured thereto are fastened to the tube with stopped sandwiched between the inward flange of the joint member and the nut by fitting is and nuts tightened around the tube that protrudes from the nut and tube insertion portion Before assembling the jig, it is a jig for fastening the fastening sleeve to the tube, and is formed on the tubular head formed at one end, the external thread formed on the outer periphery of the tubular head, and the inner periphery of the tubular head A jig main body having a formed tube insertion portion, an inwardly projecting stopper formed at the back of the tube insertion portion, and an inwardly inclined tapered surface formed at the tip of the tube insertion portion; Screwed into the screw, Become more pipe joint preswaged jig and the inward flange nut for tightening the tubes fitted clamping sleeve around it is inserted into the insertion portion protrudes from the pipe insertion portion tube. The pipe joint pre-fastening jig according to claim 1, wherein a grip bar is attached to the jig body.

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