JP2875250B1 - Test plugs for synthetic resin tubes such as polyethylene tubes - Google Patents

Abstract

An object of the present invention is to provide a test plug which is hard to be detached from a resin tube. A plug body (1) is formed by projecting a rod (3) having a diameter smaller than that of a head (2) on one side of a head (2). A concave groove 5 is provided on the distal end side peripheral side of the rod portion 3 of the plug body 1, and an O-ring 6 which is pressed against the inner wall of the synthetic resin pipe to reduce the diameter is fitted into the concave groove 5. A ridge 8 that bites into the inner wall of the synthetic resin tube is spirally provided on the peripheral side of the rod portion 3 between the O-ring 6 and the knob head 2. Further, a receiving groove 4 surrounding the rod portion 3 and holding the end of the synthetic resin pipe is provided on the one surface of the picking head 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the presence or absence of water leakage in a synthetic resin pipe such as a polyethylene pipe or a polybutene pipe which constitutes a water-based pipe, and for closing an end of the synthetic resin pipe. The present invention relates to a test plug (water stopcock) used by being attached to the end.

[0002]

2. Description of the Related Art Conventionally, there is no special thing for closing (water-stopping) the end of a synthetic resin pipe such as a polyethylene pipe, and a piece of wood or other appropriate one is selected and inserted into the end. , It is inconvenient to select the appropriate one.

[0003] In view of such a normal situation, the present invention has been made for the purpose of obtaining an unprecedented product which is easy to use and can be provided at a low price.

[0004]

A plug body is formed by projecting a rod portion having a smaller diameter than the head on one side of the knob head to form a plug body. A concave groove is provided, and an O-ring that is pressed against the inner wall of the synthetic resin pipe to reduce its diameter is fitted into the concave groove, and a peripheral side portion of the rod portion between the O-ring and the knob head. In addition, a ridge that bites into the inner wall of the synthetic resin tube is provided in a spiral shape, and a receiving groove that surrounds the rod portion and sandwiches the end of the synthetic resin tube is formed on one surface of the picking head. The configuration is provided.

[0005]

1 shows an embodiment of a test plug for a synthetic resin pipe such as a polyethylene pipe according to the present invention. FIG. 1 is a partially cutaway front view showing the relationship between a test plug and a synthetic resin pipe, and FIG. FIG. 3 is a sectional view showing a use state, and FIG. 3 is a partially enlarged view of FIG.

Reference numeral 1 denotes a plug body made of metal (in the embodiment, brass). The plug body 1 is formed by projecting a bar 3 having a smaller diameter than the head 2 on one side 2 ′ of a picking head 2. A receiving groove 4 surrounding the rod portion 3 is provided on one surface 2 ′ of the head 2 of the plug body 1, and an O-ring 6 is provided in a concave groove 5 provided on the tip side peripheral side of the rod portion 3. The test plug A is formed by fitting.

The rod portion 3 of the plug body 1 has a substantially cylindrical shape, and the diameter of the tip 3 ′ adjacent to the concave groove 5 is made smaller than the inner diameter of the synthetic resin tube 7 and inserted into the synthetic resin tube 7. It's easy. The O-ring 6 fitted in the concave groove 5 has an outer diameter such that its outer peripheral edge protrudes from the concave groove 5 and is pressed against the inner wall 7 ′ of the synthetic resin pipe 7 to reduce its diameter. Between the ring 6 and the knob head 2, on the circumferential side of the rod 3,
A ridge 8 starting from the edge of the concave groove 5 is provided in a spiral shape. The outer diameter a of the ridge 8 is substantially the same as the outer diameter of the O-ring 6, and is smaller than the inner diameter b of the synthetic resin pipe 5. (In the embodiment, the outer diameter a is 0.3 mm larger than the inner diameter b.)

The receiving groove 4 includes inner and outer peripheral wall portions 4a and 4b and an inner wall portion 4c which face each other.
a, 4b are formed in a tapered shape gradually approaching each other in the direction of the inner wall portion 4c from the opening end, and the resin pipe 7 is expanded by the tapered shape of the inner peripheral wall portion 4a, so that the inner peripheral wall portion 4b has the tapered inner portion. The resin tube 7 is pressed inward in the radial direction by the wall portion 4c side to reduce the diameter, and the resin tube 7 is narrowed as a whole and clamps the rod portion 3 surrounded by the receiving groove 4, and comes into close contact with the rod portion 3,
Prevents leaks due to water leakage and pressure and enhances safety.

When the inner diameter of the resin pipe 7 is 9.5 mm and the outer diameter is 14 mm, the outer diameter of the ridge 8 is 9.8 m.
m, the inner diameter of the receiving groove 4 (formed by the inner peripheral wall part 4a) is 9.8 mm at the narrowest part, 10.95 mm at the widest part, and the widest part of the outer diameter (formed by the outer peripheral wall part 4b) is 14 .5
A numerical example in which the narrowest portion is 13.5 mm is shown.

[0010] The knob head 2 has the same shape as the hexagonal bolt head for easy operation with a tool. However, the outer peripheral shape may be round or triangular.

When the distal end 3 'of the rod 3 of the plug body 1 is engaged with the inside of the synthetic resin tube 7 and pushed into the synthetic resin tube 7, the O-ring 6 is reduced in diameter and the inner wall 7 is closed. ′, And when the plug body 1 is rotated using the head 2 while pressing the plug body 1 with a hand or a tool, the angular ridges 8 bite into the inner wall 7 ′ (in other words, The rod portion 3 of the plug body 1 is mounted in a synthetic resin tube 7, and the tip of the synthetic resin tube 7 is forcibly engaged with the receiving groove 4 to be clamped, thereby reducing the diameter. To clamp the rod 3. Further, the test plug A can be detached from the synthetic resin tube 7 by rotating in the opposite direction to the above rotation.

[0012]

The present invention has the configuration described above,
By rotating while pressing, it can be easily inserted and attached to the synthetic resin pipe, and even after applying water pressure, the spiral ridges are attached to the inner wall of the synthetic resin pipe. Since it is bitten, it can withstand the water pressure and does not come off the synthetic resin pipe, and there is no water leakage due to the presence of the O-ring, so that a water pressure test (whether there is water leakage) of the synthetic resin pipe can be performed.

[0013] Further, since the end of the synthetic resin tube is inserted into the receiving groove and reduced in diameter to clamp the rod portion (plug main body), even if the pressure increases, it is possible to provide a plug which is harder to come off from the resin tube. it can.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a relationship between a test plug and a synthetic resin tube.

FIG. 2 is a sectional view showing a use state.

FIG. 3 is a partially enlarged view of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug main body 2 Picking head 3 Bar and rod part 4 Receiving groove 5 Concave groove 6 O-ring 7 Synthetic resin pipe 8 Protrusion

Claims (1)

(57) [Claims] 1. A plug body is formed by projecting a rod portion having a smaller diameter than the head portion on one surface of a picking head portion, and a concave groove is provided on the distal end side peripheral side of the rod portion of the plug body. An O-ring that is pressed into contact with the inner wall of the synthetic resin pipe to reduce the diameter is fitted into the groove, and this O-ring is fitted.
Between the ring and the picking head, on the peripheral side of the rod portion, a ridge that bites into the inner wall of the synthetic resin tube is provided in a spiral shape, and on one surface of the picking head, A test plug for a synthetic resin tube such as a polyethylene tube, wherein the test plug surrounds the rod portion and has a receiving groove for inserting the end of the synthetic resin tube.