JPH0128039Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a thread protection device for a threaded tube body having a thread groove formed on the outer periphery of the end portion.

[Conventional technology]

Threaded pipes with threaded grooves for threading pipe fittings on the outer periphery of the end may become susceptible to rust on the surface of the threads, dirt, etc. during transportation or storage, or adhesion of water in cold regions. Freezing may occur, making it difficult to use.

For this reason, as disclosed in Japanese Utility Model Publication No. 40-6392, a temporary socket that is screwed into the thread groove of the threaded tube is provided to protrude from the end of the tube, and the peripheral wall is pressed against the end of the tube. A method has been considered in which a flange is formed around the opening of a cap made of expanded polystyrene resin to be inserted, and the flange is bitten into a thread groove on the inner periphery of the temporary socket to protect the tube edge.

[Problem that the invention attempts to solve]

However, in the conventional technology as shown above, since the flange of the cap is rotated and bit into the inclined thread groove, it is completely impossible to achieve a complete seal with the flange. Moreover, since the flange inevitably gets damaged when biting in, there is a problem that it cannot be used repeatedly and is uneconomical. Further, in the above-mentioned prior art, there was a problem in the sealing performance at the edge of the temporary socket.

[Means for solving problems]

This invention was developed in view of the above circumstances, and it can almost completely protect the surface of the screw from rust, dust, icing, etc., and it can also be used safely so that it will not be damaged even when hooked onto a crane. It has a simple structure, is relatively easy to attach to and remove from the pipe body, and can be used repeatedly.
In addition, the purpose of this device is to provide a protection device for threaded tubes that does not have the risk of falling off. A protective device having a female threaded portion, a folded portion formed from the end toward the inner periphery, the end of the tubular body covered with the folded portion, and the male thread covered with the female threaded portion; The bent opening side cylinder end is sandwiched between the folded part and the inner circumferential surface of the end of the tube, as well as between the folded part of the protector and the end surface of one end of the tube, and the other cylinder part and A bottomed tube whose bottom part is fitted into the tube body with a predetermined distance from the inner circumferential surface of the tube body, and the tip of the bent opening side tube end portion extends radially outward beyond the external thread of the tube. A screw for a threaded tube body, comprising a synthetic resin cap body having a shape, and a ring-shaped packing inserted between the other end of the protective device and the outer peripheral surface of the tube body. The gist is protective equipment.

[Effect of invention]

The screw protector for a threaded tube according to the present invention protects the male thread exposed on the outer periphery of the end of the tube and the end of the tube by means of a protector screwed onto the tube. At the same time, this protector protects the cylindrical end on the bent opening side of the cap body, which is sandwiched between the folded part and the end face of one end of the tube body, and between the folded part and the inner circumferential surface of the end of the tube body. Also protect. The cap body seals the inside of the tube, and the bent end of the opening side of the tube is sandwiched between the protector and the tube as described above, so that the screws between the protector and the tube can be removed from the end of the tube. Prevents water droplets and dust from entering the joint, that is, the end of the tube.
The cap body has a predetermined distance from the inner circumferential surface of the tube at the cylindrical portion other than the bending opening side tube end and the bottom, and does not come into contact with the inner circumferential surface of the tube. The tip of the bent opening side end extending radially outward functions as a handhold for removing the cap body. The ring-shaped packing prevents water droplets from entering from the other end of the protective device, and together with the action of the synthetic resin cap, completely seals the externally threaded portion of the tube.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

In the figure, reference numeral 1 denotes a tubular body, and a male thread 2 is exposed on the outer circumferential surface of one end, and a female thread 3 is exposed on the inner circumferential surface of the other end.
In other words, the tube body 1 has a tube body 1a with male threads carved on the outer peripheral surface of both ends, and a tube fitting 1b with a female thread 3 screwed onto the tube body 1a with the female thread 3 partially exposed.
In this way, it can be handled immediately in a state ready for piping connection. A first protector 4 for protecting the male screw 2 is attached to one end of the tube body 1.
It is removably attached together with a synthetic resin cap body 5 and a ring-shaped first packing 6. The first protector 4 has a cylindrical shape with both ends open, manufactured by pressing or cutting an iron plate, or rolling a steel pipe. A folded portion 8 is formed on the inner circumferential side, and a constricted portion 9 is formed on the other end. On the other hand, the cap body 5 has a cylindrical shape with a bottom, and has a second cap on the opening side.
As shown in the figure, a bent opening-side tube end portion 5b having a flange portion 10 extending radially outward from the tip peripheral edge is formed, and a flange portion 1 of the bent opening-side tube end portion 5b is formed.
The tip of 0 is connected to the male thread 2 of the tube body 1 as shown in Figure 3.
It is made to extend further radially outward. In addition, the packing 6 has a substantially L-shaped cross section, and the side pieces 6
A gradually becomes thinner toward the tip. First, the packing 6 is fitted onto the outer peripheral surface of the tube 1 at a position beyond the male thread 2 with the side pieces 6a facing outward, and the cap body 5 is placed along the inner peripheral surface of the tube 1 to the bottom 5a. Insert the cap body 5 with the cap body 5 facing inward until the flange 10 comes into contact with the tube end surface, and as shown in FIG. After that, the first protector 4 is fitted with its folded part 8 to cover the tube end, and the cap body 5 is bent between the inner circumferential surface of the tube end and the tube end surface. It is placed over the tube body 1 so as to tightly sandwich the opening side tube end portion 5c, and the side piece 6a of the gasket 6 is strongly inserted between the constriction portion 9 and the outer peripheral surface of the tube body 1. Then, the female threaded portion 7 of the protector 4 screws and covers the male thread 2 of the tube body 1.
That is, the male screw 2 is sealed from the outside by the protector 4, and the cap body 5 and packing 6 inserted into both ends of the protector 4. In addition, since the cap body 5 abuts and locks on one end surface of the tube body 1 via the flange portion 10, there is no risk of it falling into the inside of the tube body 1. Further, the gasket 6 is pressed against the middle portion of the side piece 6a by the small diameter portion of the constriction 9 of the protective device 4, so that it is securely prevented from coming off. The length of the tip of the folded part 8 of the protective device 4 or the depth of the cap 5 should be determined based on the type of tube 1 and handling conditions, such as the size of the hook inserted into the tube end. shall be determined as appropriate.

On the other hand, a second protector 11 for protecting the female thread 3 is removably attached to the other end of the tubular body 1 together with a ring-shaped second packing 12. This second
The protective device 11 is a bottomed cylindrical item manufactured by pressing or cutting an iron plate or rolling a steel pipe, and has a male threaded portion 13 carved on its outer periphery and a thread extending from the opening periphery to the outer periphery. A flange portion 14 is provided protrudingly, and a screw operating portion 15 in the shape of a hexagonal bolt, for example, is bent into a convex shape on the bottom surface. Then, by screwing the bottom side of the second protector 11 into the other end of the tube body 1 until its flange portion 14 abuts, the female thread 3 of the tube body 1 is screwed through the male thread portion 13. It's blocked. In this case, the second gasket 12 is fitted around the opening of the protective device 11 in advance, and the tube body 1 is screwed in.
It is strongly inserted into the inner peripheral surface of the other end. In this way, the female thread 3 of the tube body 1 is also sealed from the outside. The depth to the bottom of the second protector 11, the wall thickness, and other dimensions may be determined as appropriate, taking into consideration the type of tube body 1, handling conditions, for example, the size of the hook inserted into the tube end, etc. It is determined.

In the screw protector for a threaded tube configured as described above, the surface of the male thread 2 is protected by the first protector 4, the synthetic resin cap 5, and the first packing 6, and the surface of the female thread 3 is Since the surface is completely sealed by the second protector 11 and the second gasket 12, it can be reliably protected from rust formation, dirt due to adhesion of dust, water intrusion, freezing, etc. It is. Further, both the inner circumferential surfaces of both ends of the tube body 1 are covered with first and second protectors 4 and 11, and a cap body 5 and a second packing 1 are placed between them.
2, for example, as shown in Figure 3, even if the lifting hooks A and B are hung, they will not come into direct contact with the inner surface, that is, the female thread 3, etc., and will also prevent vibrations and vibrations when lifting with a crane. Since it also provides a buffering effect against impacts, deformation and cracking of the end of the tube body 1 is also prevented, and therefore, the accuracy of the female thread 3 (particularly pitch deviation) and damage to the female thread caused by these deformations and cracks is prevented. You can also be protected from such things.

Furthermore, the above-mentioned device not only can be easily attached and detached by simply fitting or screwing into the tubular body 1, but also can be conveniently used repeatedly. That is, for example, by inserting the entire outer circumferential surface of a bottomed cylindrical cap into the inner circumferential surface of one end of the tube 1, the first
By screwing the female thread 7 of the holder 4 into the male thread 2 of the tube body 1, the folded portion 8 of the first protector 4 and the end of the tube body 1 are tightly connected to the open end of the cap body. Although it is true that the sealing performance is improved when the cap is clamped, the outer circumferential surface of the cap may become damaged due to the very large frictional resistance of the entire outer circumferential surface of the cap against the inner circumferential surface of the tube, or when left for a long period of time. Tube 1
This makes it very difficult to remove the cap and often results in damage when removing the cap. However, in the above configuration, the bent opening side cylinder end 5b of the cap body 5 is connected to the folded part 8 of the first protector 4.
and the inner peripheral surface of one end of the tube body 1 and the end surface of the tube body 1, and the other cylindrical portion 5c and the bottom portion 5a of the cap body 5 are spaced from the inner circumference of the tube body 1 by a predetermined distance. Tube 1
Since the cap body 5 is fitted inside, the frictional resistance between the outer circumferential surface of the cap body 5 and the inner circumferential surface of the tube body 1 is not only greatly reduced, but also can be used even if left for a long period of time. , the outer circumferential surface of the cylindrical portion 5c and the outer circumferential surface of the bottom portion 5a of the cap body 5 are not bonded to the inner circumferential surface of the tube body 1, and the tip of the bent opening side tube end portion 5b of the cap body 5 is not attached to the male thread 2 of the tube body 1. Since the cylindrical end portion 5b on the bent opening side of the temporary cap body 5 is adhered to the inner circumferential surface and the end surface of the tube body 1, the external thread of the tube body 1 is extended in the radial direction. The tip of the bent opening-side cylinder end 5b extending radially outward from 2 is pressed radially inward to peel the bent opening-side cylinder end 5b from the end surface and inner circumferential surface of the tube body 1, and then Rear, male screw 2
By pulling out the cap body 5 from the inside of the tube body 1 using the tip of the bent opening side tube end portion 5b extending further radially outward as a hook piece, the cap body 5 can be easily pulled out without damaging it. can. Further, since the bent opening side tube end 5b is covered by the folded portion 8 of the protector 4, it will not be damaged even when a hook or the like is hooked onto the tube end. Therefore,
This cap body 5 can also be used repeatedly with other components, making it extremely economical.

In the above embodiment, a case was explained in which a pipe joint with a female thread exposed at one end of the pipe body was screwed, but instead of threading such a pipe joint, male threads were installed at both ends of the pipe body. Of course, the screw protection device according to the present invention can be applied even when the tube is exposed, and in that case, both ends of the tube are protected by the same structure.

[Effect of idea]

As is clear from the above description, according to the screw protector for a threaded tube body according to the present invention, the male thread exposed at the end of the tube body is completely protected by the protector, the synthetic resin cap body, and the packing. Since it is sealed and the inside of the tube is also sealed, there is no chance of rust forming, dirt due to dust, or water intrusion inside the male screw or tube.
Can be reliably protected from freezing, etc. In addition, even if a synthetic resin cap body is left attached for a long period of time, the outer peripheral surface of the cylinder part and the outer peripheral surface of the bottom part will not adhere to the inner peripheral surface of the pipe body, and the tip of the cylinder end on the opening side of the bent part will not adhere to the inner peripheral surface of the tube body. Since it extends radially outward, it is easy to attach and detach. In addition to being easy to attach and detach as mentioned above, this cap body is protected by the folded part of the protector at the bent end of the opening side, so it is unlikely to be damaged by repeated use. Since the device can be reused together with other components, the device as a whole has the effect of being extremely economical. Furthermore, since the inner circumferential surface of the tube is covered by the synthetic resin cap and the end of the tube is also covered by the folded part of the protective gear, the tube can be easily attached even when hung with a hanging hook. It also has the effect of not causing any damage. Furthermore, since each protection means is a combination of a small number of parts with a simple structure, it can be implemented extremely easily.Furthermore, since they are simply fitted or screwed into the pipe body, they can be easily attached and detached. Furthermore, when the protector is worn, there is no risk of it falling off except when the protective gear is unscrewed, and transportation, etc. can be carried out safely.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view of the tube partially shown in section, and Fig. 2 is a front view of the assembled state showing the protective part on the male thread side partially in section. , FIG. 3 is a partial sectional view showing the handling state. DESCRIPTION OF SYMBOLS 1... Pipe body, 2... Male thread, 4... First protector, 5... Cap body, 5b... Bent opening side tube end, 5c... Cylinder part, 6... First packing, 7...
...Female thread part, 8...Folded part.

Claims (1)

[Scope of utility model registration request] A tubular body with a male thread exposed on the outer circumferential surface of the end, and a tubular body having a cylindrical shape with both ends open and a female thread on the inner circumference, and a folded part formed from the end to the inner circumferential side, and one end of the tubular body. A protective device that is covered with the folded part and the male thread is threaded and covered with the female thread part;
The bending opening side cylinder end is clamped between the folded part of the protector and the inner peripheral surface of the end of the tube, as well as between the folded part of the protector and the end surface of one end of the tube. The cylindrical portion and the bottom portion of the tube are fitted into the tube body with a predetermined distance from the inner circumferential surface of the tube body, and the tip of the bent opening side tube end portion extends radially outward beyond the male thread of the tube. A screw comprising a cylindrical synthetic resin cap body with a bottom and a ring-shaped packing inserted between the other end of the protective device and the outer peripheral surface of the tube body. Thread protection device for attached tube.