JP2934248B2 - Retaining band for pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a retaining band for a pipe joint, which can be easily attached to a pipe by a simple insertion operation, and furthermore, a simple plate is formed by a pipe shaft thrust or an external force. It is an object of the present invention to provide a retaining band for pipe joints that can accurately prevent the outer surface of a tubular body from being removed by using a tubular member and can simplify the housing.

(Industrial application field) A retaining mechanism for fitting to a headless tube.

(Prior Art) In a joint for connecting pipes such as steel pipes, it is necessary to lock a joint mechanism with respect to the pipe to be connected. It is common to provide a retaining ring or other locking projection or to form a groove to engage the coupling housing.

However, in the case where such a locking projection or groove is provided to lock the pipe and the joint housing, it is necessary to attach or process a member for such locking at the end of the connected pipe. Since the number of steps is large and complicated, some proposals have been made to lock a joint to a headless tube that does not apply such processing to the tube. That is, the locking ring is set by forming a tapered surface on the inner surface of the housing, and when the pipe slides in the axial direction due to fluid pressure in the pipe or external force, the outer peripheral side of the locking ring is pressed against the outer surface of the pipe by the tapered housing surface. This is intended to be locked.

In Japanese Unexamined Patent Publication No. Sho 57-144961 and Japanese Utility Model Laid-Open Publication No. Sho 61-122490, a locking member having a claw portion is used to lock the housing and the tube by a tightening action using an elastic material or a push bolt. It has been proposed.

(Problems to be Solved by the Invention) In the headless tube system described above, since the tube, the housing and the locking ring are all rigid members, the axial force acts on the tube as described above. In such a case, there is a possibility that the inner peripheral side of the locking ring slides with respect to the outer surface of the tubular body, and the outer peripheral side of the locking ring does not effectively receive the pressure due to the tapered surface of the housing, so that it is impossible to properly prevent the detachment. high.

For this reason, the housing is strongly tightened so that the locking ring bites into the outer surface of the tube. In this case, however, it is not easy to tighten the housing. It is necessary that such a rigid locking ring be uniformly joined and bite all around the tube body, and it is not easy to form such a uniform locking relationship over the entire circumference.

It is necessary that the locking ring slides on the tapered surface of the housing, that is, moves in the axial direction of the housing in order to prevent removal when the axial force acts on the tubular body. It is indispensable to form a convex wall for partitioning between the portion and the locking ring accommodating portion, which complicates the structure of the housing and increases the size (width) of the housing in combination with the tapered surface forming portion. I have no choice.

The above-mentioned JP-A-57-144961 and Japanese Utility Model Laid-Open No. 61-122490 are disclosed.
No. is a new method for locking the pipe using locking claws, but the locking tool has a length of several tens mm or more in the circumferential direction of the pipe. Therefore, the number of locks must be limited to about 3 to 6 in the circumferential direction of the pipe, and if the number of locks is about this level, fluid acting on a pipe such as a steel pipe is generally used. There is a disadvantage that it is difficult to demand an accurate locking action against pressure or external force.

(Means for Solving the Problems) A solid elastic material having a rectangular cross section of rubber or a soft synthetic resin material having a relatively thin layer and a right angle having sides larger than the thickness of the rectangular solid elastic material. A triangular rigid plate-shaped locking piece is buried and arranged with its oblique side inclined with respect to the side surface of the solid elastic material having a rectangular cross section, and the acute angled tip of the rigid plate-shaped locking piece is joined to the outer surface of the tube. A retaining band for pipe joints, characterized in that it is made.

(Operation) A ring-shaped solid elastic material made of rubber or soft synthetic resin is used to ring around the end of the pipe to be connected and housed in the housing.

Each of the rigid plate-shaped locking pieces having a right-angled triangle shape is stably held by the solid elastic material having a rectangular cross section as described above, and the hypotenuse is supported by the solid elastic material having a rectangular cross section. Due to the restoring force of the actual elastic material, the acute-angled tip joins and bites the outer surface of the pipe to be connected.

The solid elastic member having a rectangular cross section provided with the above-described rigid plate-shaped locking piece functions as a sealing member and an elastic connecting member.

When the extraction force acts on the tube in the above state, a rotational force is obtained on the above-mentioned rigid plate-shaped locking piece, and the biting force of the acute-angled tip on the tube increases proportionally. An accurate locking action is ensured even under conditions.

The coating of the tubular body is damaged as a result of the biting of the tip of the rigid plate-shaped locking piece into the tubular body as described above, but the solid elastic material having a rectangular cross section is partially provided around the damaged portion of the tubular body coating. The rectangular elastic member is pressed by the end of the rigid plate-shaped locking piece to accommodate and shield the damaged portion, that is, corrosion of the tube body due to damage to the coating is prevented by the rectangular elastic material.

Further, as described above, the rigid plate-shaped locking piece having a right-angled triangular shape has a simple plate shape, and is incorporated in a stable state with respect to the cross section of the rectangular solid elastic member. Can be arranged in the longitudinal direction.

(Embodiment) A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings. As shown in FIG. 1, a solid elastic material 1 having a rectangular cross section of rubber or soft synthetic resin material is used. The right triangular rigid plate-shaped locking piece 2 is attached to its hypotenuse 2a.
Are buried and arranged in an inclined state.

In the drawing, one side of the rigid plate-like locking piece 2 having a relatively thin layer of a right-angled triangular shape as described above sandwiching the right-angled portion is formed on one side surface of the solid elastic member 1 having a rectangular cross section. 1 and 2, the other side is provided so as to slightly protrude from the top surface of the solid elastic member 1 having a rectangular cross section as shown in FIGS. 2 may be formed such that one side thereof slightly protrudes from one side surface of the solid elastic member 1 having a rectangular cross section, and the other side substantially matches the top surface. It is preferable to use a hardened steel piece or the like as the rigid plate-shaped locking piece 2.

The retaining band according to the present invention is a solid elastic member 1 having a rectangular cross section.
Can be formed as an endless ring shape, and can be attached with a suitably enlarged diameter when it is mounted on the tube.However, a material formed as a linear string or rod is also applicable. The pipe can be cut in accordance with the outer diameter of the pipe to be bent, bent, and set in a housing 3 as described later. In this case, it is not necessary to prepare a separate band for each applicable pipe diameter.For example, handle in a state of being wound on a winding body, cut out to a predetermined length, and separate each band. I can respond immediately.

FIG. 3 shows a mounting state of the retaining band of the present invention including the water-stopping packing 5 with respect to the tube 4 and the housing 3 as shown in FIG.
It is as shown in the figure. That is, as shown in FIG. 3, the bands of the present invention are set on both sides of the housing 3 and are set on the outer surface between the tubes 4 in a state where the packing 5 is accommodated between the bands. As is known, the pipe body 4 is divided into two or more parts along a division surface along the axial direction, and is fastened to each other by a tightening bolt between tightening seats protruding along the division surface. By such fastening of the housing, proper attachment can be completed in combination with the elasticity of the solid elastic member 1 having a rectangular cross section.

When a pull-out force is applied to the pipe body 4 by water pressure or the like or an external force acts on the pipe body 4 set as described above, the rigid plate slightly bites into the outer surface of the pipe body 4 by the above setting. Angled tip of the hook 2
As 2b moves and takes on the action force of rotating as shown by the imaginary line in FIG. 4, the biting force on the tube body 4 increases, so that an effective retaining action is obtained as being proportional to the removal force. At the time of such a retaining action, the biting portion of the rigid plate-shaped locking piece 2 is wrapped with the solid elastic member 1 having a rectangular cross section, so that it is cut off from the outside air to obtain anticorrosion properties.

As shown in the figure, the housing 3 does not have a tapered surface and does not require a protruding wall for preventing the packing 5 from bulging or moving, and a very simple housing portion may be integrally formed.

A specific example of the use of the above-mentioned structure according to the present invention will be described. As shown in FIG. As shown in FIG. 3, a retaining band, which is a solid elastic member 1 having a rectangular cross section made of rubber and having a thickness of 7 mm and arranged at intervals, is assembled and connected as shown in FIG. The stopper was tested by applying cm ² (4.3 tons in terms of axial thrust), and in any case, no tube was pulled out.

When a water pressure of about 21 kg / cm ² is applied, deformation of the mild steel housing 5 is recognized, that is, the joint portion of the rigid plate-shaped locking piece 2 at both ends of the housing with the corner portion 2c swells and rises. It was formed and the tube was removed at about 22 to 23 kg / cm ² due to the deformation of the housing 5. However, by taking measures to further reinforce the outside of the housing 5 with a reinforcing band or the like, a stronger water pressure It has been confirmed that a stable retaining action can be obtained even when is applied.

[Effects of the Invention] According to the present invention as described above, the housing is properly locked to the headless tube only by tightening the housing, and an accurate stoppering action proportional to the withdrawal force acting on the tube body is provided. The present invention has an effect of simplifying and compacting the shape and configuration of the housing, and is an industrially significant effect.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is an explanatory view showing a front view, a partially cutaway side view and a rear view of an example of a retaining band according to the present invention, and FIG. Each slope view from one side and the other side,
FIG. 3 is a cross-sectional view of a state in which the housing and the packing are set between the tubes, and FIG. 4 is a partially enlarged view showing a state in which the rigid locking piece operates when a pull-out force acts on the tubes in the set state. It is sectional drawing. However, in these drawings, 1 is a solid elastic material having a rectangular cross section, 2 is a rigid plate-like locking piece, 2a is its hypotenuse, 2b is its tip, 3 is a housing, 4 is a tube, and 5 is a packing. Things.

Claims (1)

(57) [Claims] 1. A rectangular triangular rigid plate-shaped locking piece having a relatively thin layer and a side larger than the thickness of the rectangular solid elastic material is formed on a solid elastic material having a rectangular cross section of rubber or soft synthetic resin material. The oblique side is embedded and disposed in a state of being inclined with respect to the side surface of the solid elastic material having a rectangular cross section, and the acute angled tip of the rigid plate-shaped locking piece is joined to the outer surface of the tubular body. Retaining band for pipe joint.