JP2549744Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for joining pipes such as hot water supply and water supply pipes.

[0002]

2. Description of the Related Art Pipe joints used for piping hot water supply pipes and water supply pipes by using a composite pipe in which the inner surface or both inner and outer peripheral surfaces of a synthetic resin pipe or a metal pipe are coated with a synthetic resin include:
As disclosed in Japanese Utility Model Unexamined Publication No. 61-22991, a joint body, a fastening member, and a cap nut are known, and the joint body and the connection pipe are sealed in a liquid-tight manner by tightening the cap nut. It is.

In such a pipe joint, the end of the connecting pipe is inserted into a gap between a cylindrical guide provided at one end of the joint body and the tightening member, and the cap nut is tightened to thereby tighten the tightening member. Is reduced in diameter, the connecting pipe is sandwiched between the guide portion of the joint body and the tightening member, and the connecting pipe is pressed against a seal member in a concave groove provided on the outer peripheral surface of the guide portion of the joint body, thereby connecting the connecting pipe. A liquid-tight seal is provided between the pipe and the guide portion of the joint body.

[0004]

Therefore, when the connecting pipe is not fully inserted until the end of the connecting pipe comes into contact with the end face of the tool engaging portion of the joint main body, and is tightened with the cap nut, a water flow test or the like is performed. When this was done, there was a risk that the connecting pipe would fall out of the pipe joint.

[0005] An object of the present invention is to solve the above-mentioned problems and to provide a pipe joint capable of confirming the end position of the connection pipe in a state where the connection pipe is completely connected.

[0006]

The pipe joint according to the present invention is provided with a cylindrical guide portion to be fitted in a connecting pipe and a connecting tool connected to a base end of the guide portion and having an outer peripheral surface to which a fastening tool is engaged. A joint main body having a tool engaging portion, and a concentric outer fitting having a gap into which a connecting pipe is inserted into a guide portion of the joint main body, and having a radial gap extending over the entire length and capable of reducing the diameter. A split ring having a substantially cylindrical shape, and a press ring which is fitted to the split ring and which is pressed inward by tightening a bolt. A connection pipe insertion confirmation notch is provided.

The shape of the pipe joint of the present invention is not particularly limited, and can be applied to a female screw adapter, a socket, an elbow, a cheese, and the like, in addition to a male screw adapter described later.

[0008] The material of the split ring used in the present invention is not particularly limited, and may be either metal or synthetic resin.
For example, a copper alloy such as brass is preferably used.

The number of notches for confirming the insertion of the connecting pipe of the split ring used in the present invention is not particularly limited. However, the pipe can be visually recognized from any angle even when performing piping work in a building in a limited space. As described above, it is preferable to provide three or more locations at equal intervals. Further, the shape and size are not particularly limited, but are preferably a square having a side of about 2 to 10 mm so that the inside can be easily viewed.

[0010] On the outer peripheral surface of the split ring used in the present invention,
Preferably, a groove into which the holding ring is fitted is formed in the circumferential direction so that the holding ring does not slide in the axial direction.

As the bolts used in the present invention, hexagon socket head bolts are used, which can be tightened with a hexagon wrench from the head thereof, and the space is smaller than when a monkey wrench is used. It is preferable because the construction is possible.

In order to avoid excessive tightening of the presser ring used in the present invention, it is preferable to insert a washer by externally fitting the bolt.

[0013]

The pipe joint of the present invention comprises a joint body, a split ring and a presser ring, and a notch for confirming connection pipe insertion is provided near the tip of the split ring near the end face of the tool engaging portion.
Whether or not the connection pipe is sufficiently inserted until it is close to the end face of the tool engagement portion of the joint body can be easily visually recognized from the notch even after tightening.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pipe joint of the present invention. FIG. 1 is a partial cross-sectional view showing a use state of the pipe joint of the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a perspective view of a split ring used in the pipe joint of the present invention. FIG. The pipe joint according to the present invention is a male screw adapter including a joint body 1, a split ring 2 and a holding ring 3. Fitting body 1
Has a cylindrical guide 11 at one end in the axial direction, and the guide 11 has an outer diameter slightly smaller than the inner diameter of the connection pipe 5 so that the guide 11 can be fitted into the connection pipe 5 to be connected. ing. On the outer peripheral surface of the guide portion 11, a concave groove 12 is engraved along the entire circumference in a circumferential direction, and an annular seal material 13 made of an elastic material such as rubber is fitted into the concave groove 12. Have been. On the outer peripheral surface closer to the front end than the concave groove 12, a non-slip annular convex portion 14 is engraved over the entire circumference in the circumferential direction.

At the base end of the guide portion 11, a tool engaging portion 15 having a large diameter concentric with the guide portion 11 and having a hexagonal outer peripheral surface so that a tightening tool such as a wrench can be engaged. It is installed continuously. The tool engaging portion 15 is provided with a connecting portion 16 connected to devices such as valves and other pipe joints on a side opposite to the guide portion 11. It has a small diameter concentrically with a male screw.

The split ring 2 has a substantially cylindrical shape which is concentrically fitted at a predetermined distance from the guide portion 11 of the joint main body 1 and has an axial gap 21 over the entire length. The diameter can be reduced. At the tip end which comes into contact with the end face of the tool engaging portion 15, rectangular connection pipe insertion notches 22 are provided at substantially equal intervals at three places including one end facing the gap 21. An engagement projection 25 is protruded from the inner surface of the distal end of the split ring 2 and is engaged with a concave groove 17 provided along the end surface of the tool engagement portion 15 of the joint body 1. On the outer peripheral surface of the split ring 2, a concave groove 23 into which the presser ring 3 is fitted is engraved along the circumferential direction, and on the inner peripheral surface, three ridges 24 having a substantially semicircular cross section are formed. It is juxtaposed in the direction.

The holding ring 3 is provided with opposing tightening portions 32 at both ends of a substantially cylindrical portion 31 fitted into the concave groove 23 of the split ring 2, and a bolt 4 screwed to the tightening portion 32. To press the split ring 2 inward, so that the space between the connecting pipe 5 and the guide portion 11 of the joint body 1 is sealed in a liquid-tight manner.

When the pipe joint of the present invention is used, the connecting portion 16 of the joint body 1 is rotated by engaging a fastening tool such as a wrench on the outer peripheral surface of the tool engaging portion 15 and rotating the connecting device. And other fittings.

Next, the connecting pipe 5 is inserted into the gap between the guide portion 11 and the split ring 2 until the tip thereof approaches the end face of the tool engaging portion 15. At this time, whether or not the connection pipe 5 has been sufficiently inserted until the distal end thereof approaches the end face of the tool engagement portion 15 is visually recognized by the connection pipe insertion confirmation notch 22.

In this state, if the hexagon socket head cap screw 4 screwed to the tightening portion 32 of the holding ring 3 is tightened using a hexagon wrench, the split ring 2 is reduced in diameter, and the outer peripheral surface of the connection pipe 5 is removed. It is pressed inward over substantially the entire circumference, and is pressed against the sealing material 13 fitted in the concave groove 12 on the outer peripheral surface of the guide portion 11. As a result, the connecting pipe 5 is sandwiched between the guide portion 11 of the joint body 1 and the split ring 2, and the space between the inner peripheral surface of the connecting pipe 5 and the outer peripheral surface of the guide portion 11 is made liquid-tight by the sealing material 13. Sealed.

[0021]

[Effect of the Invention] Since the pipe joint of the present invention is constructed as described above, the bolts are tightened to check whether or not the connection pipe is sufficiently inserted until it comes close to the end face of the tool engagement portion of the joint body. Even afterwards, the connection pipe insertion confirmation notch can be easily visually recognized, and due to insufficient insertion of the connection pipe, the connection pipe will come off, and the interior materials such as the ceiling, wall, floor, etc. in the room will be contaminated by water leakage. Never do.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a use state of the pipe joint of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a split ring used in the pipe joint shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Split ring 3 Holding ring 4 Bolt 5 Connecting pipe 11 Guide cover 15 Tool engaging part 21 Gap 22 Notch for confirming insertion of connecting pipe

Claims (1)

(57) [Scope of request for utility model registration] A joint body having a cylindrical guide portion to be fitted into the connecting pipe and a tool engaging portion connected to a base end of the guide portion and having a peripheral surface on which a tightening tool is engaged; A substantially cylindrical split ring which is concentrically fitted to the guide portion of the joint main body with a gap into which the connecting pipe is inserted, and which can be reduced in diameter with an axial gap extending over its entire length; A press ring which is externally fitted to the split ring and is pressed inward by tightening a bolt, and a connecting pipe insertion confirmation notch is provided near a tip of the split ring close to an end face of a tool engaging portion. A pipe joint characterized by the above-mentioned.