JPH0237018Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a push screw body that can improve the handling of movable pipe joints used when connecting pipes, for example, in a manner that allows them to expand, contract, and swing freely. Regarding.

(Prior art) Generally, when connecting water pipes, etc.,
Telescoping and swinging movable pipe joints are often used as a measure to provide earthquake resistance.

However, when such movable pipe joints are transported or handled at actual work sites, these pipe joints expand and contract inadvertently, making handling inconvenient and causing problems in actual work. When making piping connections, it is very difficult to properly initialize the relative positions of various parts of the pipe joint so that the pipe joint has good flexibility.

Therefore, in the past, as a means to solve the above-mentioned difficulties, a method described, for example, in Japanese Utility Model Application Publication No. 175888/1988 has been developed.

That is, in this conventional type, as shown in FIG. 11, a socket pipe 32 is attached to a ball sleeve 31 that is fitted onto one end of a joint body 30 so as to be able to slide spherically.
A shearing ring 33 that is sheared when a predetermined load is applied is provided at a sliding contact position between the socket pipe 32 and the ball sleeve 31 for a pipe joint in which the socket pipe 32 and the ball sleeve 31 are slidably inserted. It is something.

Therefore, according to this means, unless a load of a predetermined value or more is applied to the shearing ring 33 and the shearing ring 33 is broken, both the ball sleeve 31 and the socket pipe 32 are in a fixed state, and during transportation. This makes it extremely easy to handle such items.

(Problem to be solved by the invention) However, the conventional means
3 is used to engage and fix predetermined members with each other, after installing the shear ring 33 and fixing the socket pipe 32 and the ball sleeve 31, the socket pipe 32 is It is completely impossible to change the sliding position of the ball sleeve 31. Therefore, in the conventional method, after assembling the pipe joint by incorporating the shear ring 33, the overall length of the pipe joint is appropriately changed by, for example, sliding the socket pipe 32 as appropriate, depending on the usage conditions. This has had major problems in that it cannot be used for many purposes, lacks flexibility in handling, and is inferior in practicality.

Moreover, in the conventional art, the shear ring 33
Once assembled into the pipe joint, the shear ring 3
In order to replace 3, the entire fitting must be disassembled, making the work very complicated and difficult. The problem was that it was not easy to change the value of , and it was even less convenient.

Furthermore, in the conventional type, grooves 34 and 35 must be carved in predetermined positions on the inner circumferential surface of the ball sleeve 31 and the outer circumferential surface of the socket tube 32, respectively, in order to attach the shear ring 33. In addition to the fact that the processing work is very troublesome, as the diameter of the target pipe becomes larger, the shear ring 33 must also be made larger, making it unsuitable for large-diameter pipes.
There were also difficulties in its manufacture.

The present invention was devised in view of the conventional problems as described above, and its purpose is to set the setting conditions such as the dimensions of the pipe joint and to prevent the movement of the pipe joint in accordance with the usage conditions of the pipe joint. The purpose of this invention is to make it possible to easily change the setting of the load value at which the valve becomes movable, and also to improve manufacturing efficiency and facilitate use in large-diameter piping.

(Means for solving the problem) The present invention does not use a member such as a shear ring as in the past, but uses a push screw to fix the movable part of a pipe joint when the shear load is less than a predetermined shear load. The present invention is designed to solve the above-mentioned problems of the conventional art by taking into account the following problems.

That is, the gist of the configuration of the present invention is that when a shearing force of a predetermined level or higher is applied to the set screw body 2 having the threaded portion 3, at least the tip of the set screw body 2 that comes into contact with or bit into the joint member is pushed. A sheared portion 6 for separating from the screw body 2 is formed at or above the tip.

(Function) Therefore, the push screw body characterized by the above configuration is screwed onto one joint member of a movable pipe joint that can move relative to each other, and its tip abuts or bites into the other joint member. When used together, the relative movement of both joint members is forcibly restrained, and a shearing force of more than a predetermined value is applied to the push screw body due to fluid pressure being actually supplied inside the pipe joint. In this case, the sheared portion 6 is sheared and the tip portion is separated from the set screw body 2, thereby making the joint member of the pipe joint movable.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the push screw body 1 according to the present invention, and in the figure, reference numeral 2 indicates a push screw body having a threaded portion 3 with a male thread. A head 4 having the same shape is provided. 5,
Reference numeral 5 indicates two sharp biting blades protruding from the tip of the lower end of the set screw body 2. Reference numeral 6 indicates a sheared part formed above the biting blades 5, 5, and the sheared part 6 has a notch on its outer periphery so that the shearing strength is inferior to other parts of the screw body 2. 7 has been applied.

The press screw body 1 according to this embodiment has the above-mentioned configuration, but the effective diameter d and effective cross-sectional area of the sheared portion 6 are determined by taking into consideration the material etc. It is designed to give you strength.

Next, a specific usage example of the push screw body 1 will be explained in a second example.
A case where the present invention is applied to the pipe joint shown in the figure will be described. First, the structure of the pipe joint shown in the figure will be briefly described.

That is, in the pipe joint shown in the figure, auxiliary rings 12, 12a are separately connected with bolts 13 to joint bodies 11, 11a, which are screwed onto the ends of pipe bodies 10, 10a to be connected, respectively. The spherical bulges 15, 15a of the joint tubes 16, 16a are respectively fitted into the spherical recesses 14, 14a so as to be swingable and connected. In addition, a separate auxiliary joint pipe 1 is attached to the two joint pipes 16 and 16a.
7 are slidably fitted together.

Therefore, in this pipe joint structure, the joint body 11,
The mutual dimension L of the joints 11a can be increased or decreased, and the joint bodies 11, 11a and the joint pipes 16, 16a can swing relative to each other. In addition, in the figure, 18,
Reference numeral 18a indicates a stopper body that is screwed onto one end of the auxiliary joint pipe 17 and one end of one joint pipe 16a, and the stopper body 1
8 and 18a are protrusions 2 protruding from predetermined positions of the auxiliary joint pipe 17 and the other joint pipe 16.
1 and 21a, respectively, and the auxiliary joint pipe 1
This is to prevent 7 etc. from falling out.

In the above-mentioned pipe joint, the press screw body 1 includes, for example, the thick portions 19, 19a on the sides of the stopper bodies 18, 18a, and the auxiliary ring bodies 12, 12, as shown in the figure.
It is used by being screwed into each screw hole 20, 20a, .

That is, to explain this in detail, for example, as shown in FIGS. 3 and 4, the push screw body 1 screwed into the screw hole 20 of the stopper body 18 is firmly tightened, and the biting blade at the tip of the screw body 1 is firmly tightened. 5, 5 are bitten into the outer peripheral surface of the joint tube 16.

In this way, the joint pipes 16, 16a and the auxiliary joint pipe 17 can be formed by biting the biting blades 5, 5 of the push screw bodies 1 provided at each part into the surfaces of the respective joint members facing each other. There is no mutual sliding, and each joint pipe 16, 16a does not swing relative to the joint body 11, 11a. Therefore, even if it is transported in this state, the parts of the pipe joint will not unintentionally rattle or expand or contract, and it is also very easy to handle when connecting the pipe bodies 10 and 10a. It becomes easier.

Next, after the pipe connection, the pipe bodies 10, 1 are actually connected.
When fluid is flowed into Oa and used, the fluid pressure acts to stretch the entire pipe joint, and this action acts as a shearing force on each push screw body 1. Therefore, the sheared portion 6 of the press screw body 1, which was determined in advance to be sheared by the shear load generated by the fluid pressure, breaks down by shearing as shown in FIG. Each part that was in a fixed state can slide or swing, functioning as an original swinging telescopic joint.

However, when performing actual piping work, for example, if the mutual spacing between the pipe bodies 10 and 10a to be connected is changed and it becomes necessary to extend or shorten the dimension L of the entire pipe joint, the joint pipe 1
6, 16a and the auxiliary joint pipe 17 etc. can be loosened to make adjustments in a free state, and in the same way when adding a step to the piping 10, 10a. Also each joint pipe 16, 16a and joint body 11, 11a
Adjustment can be easily made by loosening the push screw body 1 that fixed the sides.

Furthermore, when the inner diameter da or fluid pressure of the pipe joint is changed, it is necessary to change the shear strength of the push screw body 1 accordingly. By increasing or decreasing the number of
This can be dealt with appropriately. That is, in the case where the movement of the joint pipe 16 and the auxiliary joint pipe 17 is restricted by three press screws 1 as shown in FIG. 3, if they are combined into one, the overall shear strength will be In other words, the load value at which each part of the pipe joint is in a movable state can be set to 1/3. In addition, in order to change the load value that makes each part of the pipe joint movable as described above, other than increasing or decreasing the number of press screws 1, it is possible to use other presses with different shear strengths of the sheared parts 6. Of course, this can be dealt with by replacing it with a screw body.

In the above embodiment, the notch 7 is provided at the upper position of the biting blades 5, 5 to provide the sheared part 6, but the present invention does not specify the specific position of the sheared part 6. The forming method is not limited to this, for example, as shown in FIG. Further, as shown in FIG. 7, a notch 7 may be provided in the biting blade 5 itself, and a sheared portion 6 may be provided in the biting blade 5 itself.

Furthermore, in the present invention, it is not an essential requirement to form the biting blade 5 at the tip of the push screw body 2; for example, as shown in FIG. may be rounded or flat, and even in this case, the set screw body 2
By tightening, the distal end portion can be brought into firm contact (pressure contact) with the joint member, and the movement of the pipe joint member can be sufficiently restrained.

As described above, the shape of the tip of the push screw main body 2 according to the present invention can be freely changed in design, and the point is that the tip of the push screw main body 2, which comes into contact with or bites into the joint member, has a predetermined shear. It is sufficient that the sheared portion 6 is formed at the tip itself or above the tip so as to be separated from the press screw main body 2 by a load. Further, the load value at which the sheared portion 6 is sheared may be set according to the usage conditions of the pipe joint to be used, and its specific value is not critical.

Furthermore, in the above embodiment, a head similar to the head of a hexagonal bolt is provided on the upper part of the set screw body 2 in order to enable the push screw body to be tightened with a spanner, etc., but this is not included in the present invention. However, the present invention is not limited to this, and may be modified as appropriate, for example, by providing a hexagonal hole so that it can be tightened with a hexagonal wrench.

In addition, in the above embodiments, explanations are given for pipe joints that are expandable and swingable, but the specific structure of the movable pipe joint to which the push screw body of the present invention is used is not applicable. Needless to say, there is no
For example, pipe joints that perform only simple expansion and contraction or swinging are naturally within the scope of the present invention. Therefore, the specific mounting position and mounting manner of the press screw body 1 according to the present invention may be appropriately determined depending on the structure of the pipe joint. For example, as shown in FIG. , 40a, or screw the press screw body 1 to a flange member 42 separately attached to the flange portion 41 of one joint member 40 as shown in FIG. Changes such as enforcement are free.

(Effects of the invention) As described above, the present invention provides a sheared portion that separates the tip from the push screw body when a shearing force of more than a predetermined value is applied to the push screw body. By screwing the joint members into one joint member that can move relative to the other, the joint members can be fixed under conditions of a certain load value or less. If it becomes necessary to change the load value at which the pipe joint is in a movable state due to a change in pressure, the pressure can be changed by simply increasing or decreasing the number of push screws attached to one joint member. The shear load value of the threaded body can be changed, and as a result, a special effect has been obtained in that the setting of the shear load value can be changed extremely easily compared to the conventional means using a shear ring.

In addition, since the shear load value can be changed simply by changing the number of push screw bodies, there is no need to prepare many types of push screw bodies, which has the advantage of being easy to use. .

Furthermore, the present invention makes it possible to freely move the pipe fitting member by loosening the set screw body, even after the movement of the joint member is once restrained by tightening the set screw body. As a result, the dimensions of the pipe fitting can be changed to the desired state according to the usage conditions, etc., and as a result, compared to the conventional type in which the fitting members could not be moved at all after the pipe fitting was assembled, the This has resulted in a remarkable effect of further improving the convenience of use.

Furthermore, even if the diameter of the pipe fitting to be used increases, the present invention does not need to increase its diameter unlike conventional shear rings, so it can be used regardless of the diameter of the pipe fitting to be used. , it also has excellent effects that make its application range very wide.

In addition, the present invention makes it possible to attach the push screw body with a very simple processing operation such as drilling a screw hole at a predetermined position of the pipe joint member, so it is possible to carve a groove for attaching a conventional shear ring. Not only is the machining process much simpler than conventional methods, but the push screw body can be attached after the pipe joint is manufactured, without requiring the complicated labor of incorporating a shear ring when assembling the pipe joint, as was the case in the past. This has the advantage that the installation work is very easy.

In this way, the present invention has developed a push screw body with a completely new configuration that has not been seen before, in which the tip of the push screw body separates when a predetermined shearing load is applied. In addition to achieving excellent effects, it also has many advantages such as being suitable for joint members that are configured to be able to slide on spherical surfaces and to be able to swing relative to each other. The value is enormous.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the press screw body according to the present invention. FIG. 2 is a half-cut sectional view showing an example of its usage state. FIG. 3 is an enlarged sectional view taken along the line A-A in FIG. 2. FIG. 4 is an enlarged cross-sectional view of the main part showing the fixed state of the pipe joint member. FIG. 5 is an enlarged sectional view of the main part of the push screw body in a sheared state. FIGS. 6 and 7 are enlarged front views of main parts showing other embodiments. FIGS. 8A and 8B are front views showing other embodiments of the press screw body. FIGS. 9 and 10 are schematic sectional views of main parts showing other attachment states of the push screw body. FIG. 11 is a half-cut sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1...Press screw body, 2...Press screw main body, 3...Screw part, 5...Bite blade, 6...Sheared part.

Claims (1)

[Claims for Utility Model Registration] 1. A press screw body 2 having a threaded portion 3, which is a press screw body used in a movable pipe joint to prevent the movement of a relatively movable joint member of the movable pipe joint.
When a shearing force of a predetermined level or higher is applied to the press screw body 2, which comes into contact with or bites at least the joint member.
A press screw body for restraining the movement of a movable pipe joint, characterized in that a sheared portion 6 for separating the tip portion from the press screw main body 2 is formed at or above the tip portion. 2. The press screw body for restraining the movement of a movable pipe joint according to claim 1, wherein the press screw main body 2 has one or more biting blades 5 formed at its tip. 3. The press screw body for restraining the movement of a movable pipe joint according to claim 1, wherein the sheared portion 6 is configured to have a small cross-sectional area by a notch 7.