JPH0526396Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a tube separation prevention device.

[Conventional technology]

Conventionally, as a pipe joint, a socket A is used as shown in Fig. 4.
A pipe joint is known in which an insertion port B is inserted into the pipe joint and a rubber ring is used to ensure watertightness.

This type of pipe joint is widely used because the connection work is very simple, but it has the problem that it can come off relatively easily when axial thrust force due to the internal fluid is applied, and as shown in the figure, it is difficult to prevent the pipe from separating. Ingredients C
It is necessary to restrain both parties. Furthermore, as the above-mentioned pipe detachment prevention device, one is known that has a structure that increases the resistance force in response to a force applied to the pipe joint in the direction of extraction (for example, Japanese Utility Model Application Publication No. 143685/1985).

[Problems with conventional technology]

By the way, the above-mentioned conventional tube detachment prevention device C applies a resistance force for preventing the tubes A and B to be connected from coming off, mainly by applying a constant tightening force to the band member _{C1 of the tube detachment prevention device C1} and the outer surface of the tube A or B. Since this is based on the plane friction force between the pipe and the pipe, it has the disadvantage that in the case of a pipe with low surface friction resistance such as a synthetic resin pipe, it may not be possible to provide sufficient pull-out resistance. In addition, those with a structure that increases the tightening force on the pipe due to the wedge effect,
The tapered surface that produces the wedge effect and the flange for attaching to the pipe are located at different locations, so the installation process requires two steps: attaching to the pipe and assembling the mechanism that produces the wedge effect. The disadvantage was that it required a lot of work.

[The problem that the idea aims to solve]

In view of the above-mentioned drawbacks, this invention has been developed so that even if a strong ejection force is applied, the ejection opposing force increases accordingly.
The purpose of this invention is to provide a tube detachment prevention device that can sufficiently prevent the tube from being pulled out and is easy to install.

[Technology that led to solving the problem]

That is, in the pipe detachment prevention device of this invention, connecting ears protruding outward in the radial direction are provided on the dividing surface of the two-split short pipe whose inner diameter is approximately equal to the outer diameter of the pipe to be connected. The ear pieces are formed with inclined surfaces whose height in the tangential direction to the tube gradually increases along the axial direction and which face each other to form a wedge-shaped body,
The two-split short pipes can be connected together by fitting a fitting piece having a tapered inner surface along the inclined surface, and the fitting piece has an axis of the pipe to be connected. It is characterized by a protruding engaging claw piece that engages with the connecting rod arranged in the direction.

〔Example〕

Next, an example of this invention will be described.

FIG. 1 is a perspective view of an embodiment of the invention, FIG. 2 is a side view of the embodiment, and FIG. 3 is an explanatory view of the embodiment in use.

The tube detachment prevention device 1 of this invention includes a tube A to be connected,
A two-split short pipe 2 whose inner diameter is approximately equal to the outer diameter of B.
Joining ears 3, 3 are provided on the dividing surfaces 2A, 2A of 2 and project radially outwardly from each other, and these ears 3,
3, an inclined surface 4 whose height h in the tangential direction (arrow X) to the tubes A and B gradually increases along the axial direction (arrow Y), and which faces each other to form a wedge-shaped body;
4 is formed, and these two-split short tubes 2, 2 are integrated by fitting a fitting piece 5 having a tapered inner surface 5A, 5A that matches the inclined surfaces 4, 4 into the inclined surfaces 4, 4. In addition to being connectable, the fitting piece 5
Engagement pawls 5B, 5B are provided protruding from the sides to engage with connecting rods 6 disposed in the axial direction of the pipes A, B to be connected.

In the above embodiment, the other end of the connecting rod 6 is arranged in a tensioning relationship with another set of tube detachment prevention devices 1 as shown in the figure. Alternatively, a cord with high tensile strength such as a glass fiber rope or wire may be used, and hooks 6A, 6A may be provided at the tips as shown in FIG.

[Effect]

As shown in Figure 2, attach the tube separation prevention device 1 to the tubes A and
By fitting onto the outer periphery and fitting the fitting pieces 5 onto the inclined surfaces 4, 4, the tube detachment prevention 1 is temporarily fixed to the outer periphery of the tube. Next, connect the connecting rod 6 with the engaging claw pieces 5B, 5B.
If they are locked, the distance between them will be restricted, so when a thrust force is applied to the tubes A and B in the direction of arrow W and they try to separate from each other, the connecting rod 6
The fitting piece 5 that locks the short pipe 2, the inclined surface 4 on the 2 side,
4, and as a result, pressure is applied to the two-split short tubes 2, 2 in the direction of tightening, the gripping force on the tube increases, and the resistance to extraction increases.

〔effect〕

As explained above, the tube detachment prevention device 1 of this invention can be installed by simply fitting the fitting pieces 5, 5 onto the inclined surfaces 4, 4 of the two-split short tubes 2, 2.
It can be fixed around the pipe, making the work very simple with just one touch, and the two fitting pieces 5,
5 by the connecting rod 6, the gripping force on the outer periphery of the pipes to be connected is increased, so that a pull-out resistance force corresponding to the thrust force is generated in the short pipes 2, 2, and pull-out can be reliably prevented.

In addition, according to the pipe detachment prevention device of this invention, when the thrust force is low, the hoop stress on the pipe is correspondingly small, so unnecessary stress is not applied to the pipe, and it can be used safely. have an effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of this invention, FIG. 2 is a side view of the embodiment, FIG. 3 is a side view of main parts of another embodiment, and FIG. 4 is an explanatory diagram of a conventional example.

Claims (1)

[Scope of utility model registration request] A pipe separation prevention device characterized in that the split surfaces of a two-split short pipe, the inner diameter of which is approximately equal to the outer diameter of the pipes to be connected, have connecting lugs that protrude radially outward from each other, and the lugs have inclined surfaces that gradually increase in height in the axial direction in the tangential direction to the pipes and face each other to form a wedge-shaped body, the two-split short pipes can be connected together by fitting a mating piece having a tapered inner surface that follows the inclined surfaces, and the mating piece has an engaging claw that protrudes from it and engages with a connecting rod that is arranged in the axial direction of the pipes to be connected.