JPH06265068A - Coupling device for piping - Google Patents

Abstract

PURPOSE:To improve workability during fastening by preventing dislocation of a retaining ring from the tip part of a flexible pipe. CONSTITUTION:A coupling device for a piping comprises a coupling body 1 provided at the interior with an axially extending-through hole part 2; a box nut 6 on the inner surface of which a female screw part 7 joined in a screwed-in state with a male screw part 4 on the outer surface of the coupling body 1 and a round hole part 8 having diameter lower than that of the female screw part 7 are formed in succession; and a retaining ring 9 to engage in a bracing state with the tip part of a flexible pipe 10 inserted in the box nut 6 at the interior of the round hole part 8 of the box nut 6. The tip of the flexing pipe 10 protruded from the retaining ring 9 is compressed for deformation between the end face of the coupling body 1 and the retaining ring 9 by fastening in a way that the female screw part 7 of the box nut 6 is joined in a screwed-in state with the male screw part 4 on the outer surface of the coupling body 1. The box nut 6 is fastened against the coupling body 1 in a state to keep a state that the retaining ring 9 is mounted on the flexible pipe 10 braced therewith in the round hole part 8 of the box nut 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for piping.

[0002]

2. Description of the Related Art Conventionally, a method has been adopted in which a flexible pipe is connected to a gas pipe arranged along an outer wall of a building such as a house by using a joint device to branch the gas flow path. ing.

As a conventional joint device, there is provided a joint body having a hole portion penetrating in the axial direction in the inside thereof, and a flexible pipe connecting hole portion having a step portion formed in the middle of the hole portion,
From a retaining ring that engages the distal end portion of the flexible pipe and non-rotatably engages with the inner surface of the connection hole portion, and a tightening member that is screwed into the joint body and presses the retaining ring inwardly of the connection hole portion. Is known.

[0004]

However, in the above-mentioned conventional coupling device, the retaining ring is pinched with fingers so as to be inserted into the connection hole so that the distal end of the flexible tube is held in the state of being embraced and engaged. The tightening member is screwed into the joint body, and the screwing of the tightening member onto the joint body distracts the worker from removing the snap ring from the tip of the flexible pipe before inserting it into the connection hole. There was a problem with sex.

The present invention solves such a problem, and an object of the present invention is to improve workability during tightening without causing the retaining ring to come off from the distal end portion of the flexible tube.

[0006]

In order to solve this problem, the present invention provides a joint main body having a hole portion that penetrates in the axial direction in the inside, and a female screw portion that is screwed into a male screw portion on the outer surface of the joint main body. A cap nut having a circular hole portion having a diameter smaller than that of the female screw portion is continuously formed on the inner surface, and a distal end portion of a flexible pipe inserted into the cap nut inside the round hole portion of the cap nut is engaged and engaged. And a snap ring, and the female thread portion of the cap nut is screwed into the external thread portion of the outer surface of the joint body to tighten the end of the flexible pipe protruding from the snap ring between the end surface of the joint body and the snap ring. It is configured to be deformed by compression.

[0007]

With this configuration, the internal thread portion of the cap nut is screwed into the external thread portion of the joint body while the retaining ring is held in the round hole of the cap nut while being held by the flexible pipe, and the cap nut is tightened. Therefore, the retaining ring does not come off from the tip portion of the flexible pipe during the tightening work, and the workability during the tightening can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 3, reference numeral 1 has a hole 2 penetrating in the axial direction inside, and male screw parts 4 and 5 are formed on one end side outer surface and the other end side outer surface with a collar part 3 provided on the outer surface as a boundary. The joint body 6 has a female screw portion 7 screwed into one male screw portion 4 of the joint body 1 and a round hole portion 8 having a smaller diameter than the female screw portion 7 formed continuously on the inner surface in the axial direction. The cap nut 9 is a one-piece ring-shaped retaining ring that holds the tip of the bellows-shaped flexible tube 10 inserted into the cap nut 6 inside the round hole 8 of the cap nut 6 in a hugging manner.
The retaining ring 9 has an uneven portion 11 formed on the inner surface thereof so as to be engaged with the outer uneven portion of the flexible tube 10 in the axial direction. The retaining ring 9 has a substantially circular front shape before being attached to the flexible tube 10, and the left and right ring portions 9a and 9b are formed.
Are connected by a thin portion, and when the flexible tube 10 is to be attached, the thin portion is cut and left and right ring portions 9a, 9b are cut.
Are to be divided from each other. Further, the retaining ring 11 has symmetrical inner and outer surfaces with respect to the center in the axial direction so that the retaining ring 11 can be used either forward or backward. Reference numeral 12 is a cylindrical spacer inserted into the round hole portion 8 of the cap nut 6 so as to fill the gap between the round hole portion 8 of the cap nut 6 and the retaining ring 9, and one end of the spacer 12 in the axial center direction. A plate portion 13 which is sandwiched between the end portion of the cap nut 6 on the round hole portion 8 side and the rear end portion of the retaining ring 9 is bent inwardly. 14 is the end face of the joint body 1 and the retaining ring 9
Front end of the tube and outer surface of flexible tube 10 and spacer 12
An O-ring that simultaneously abuts the inner surface of the flexible pipe 10 before tightening the cap nut 6 and is fitted into the concave portion of the end of the flexible pipe 10.

Next, the joint device and the flexible pipe described above
The connection order with 10 will be described. First, the tip of the flexible pipe 10 is inserted into the cap nut 6 from the round hole 8 side, and the retaining ring 9 (left and right) separated from each other is left at the tip of the flexible pipe 10 with two uneven ridges. Apply the ring parts 9a, 9b). Also flexible tube 10
The O-ring 14 is fitted in the concave portion of the tip of the flexible tube 10 in this state, and the flexible tube 10 is pulled in the direction to pull it out from the cap nut 6, and the tip of the flexible tube 10 is integrated with the retaining ring 9 into the cap nut 6. Position it. As a result, the retaining ring 9 holding the flexible tube 10 is attached to the round hole 8 of the cap nut 6.
It is located inside and is surrounded by the spacer 12.
In this way, with the holding portion of the flexible tube 10 by the retaining ring 9 positioned in the round hole portion 8 of the cap nut 6, the female screw portion 7 of the cap nut 6 is screwed into the male screw portion 4 of the joint body 1. As the cap nut 6 is tightened, the round hole 8 of the cap nut 6
The retaining ring 9 is pushed by the end of the retaining ring 9, and two peaks and depressions of the flexible pipe 10 projecting from the front end of the retaining ring 9 are formed between the retaining ring 9 and the end surface of the joint body 1 on the side of the male screw portion 4 side. It is sandwiched and crushed, and the O-ring 14 is forcibly expanded by the deformed portion 10a, and the O-ring 14 is pressed against the end surface of the joint body 1, the front end portion of the retaining ring 9, the outer surface of the end of the flexible tube 10 and the inner surface of the spacer 12 at the same time. As a result, the joint body 1 and the cap nut 6 are connected to the flexible pipe 10.

[0010]

As described above, according to the present invention, the female screw portion of the cap nut is screwed onto the male screw portion of the joint body while keeping the retaining ring clinging to the flexible pipe in the round hole portion of the cap nut. Since the cap nut can be tightened by tightening it,
The retaining ring does not come off from the tip of the flexible pipe during the tightening work, and the workability during the tightening can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a state before a flexible pipe is connected to a joint body in an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a state before a flexible pipe is connected to the joint body.

FIG. 3 is a vertical cross-sectional side view showing a connection state of a flexible pipe to the joint body.

[Explanation of symbols]

 1 Joint body 2 Hole part 3 Collar part 4, 5 Male screw part 6 Cap nut 7 Female screw part 8 Round hole part 9 Retaining ring 10 Flexible tube 11 Uneven part 12 Spacer 13 Plate part 14 O-ring

Claims (1)

[Claims] 1. A joint body having a hole portion that penetrates in the axial direction in the inside, a female screw portion that is screwed into a male screw portion on the outer surface of the joint body, and a circular hole portion having a diameter smaller than that of the female screw portion. A cap nut formed on the cap nut, and a retaining ring for retaining and engaging the distal end portion of the flexible pipe inserted into the cap nut inside the round hole portion of the cap nut, wherein the female screw portion of the cap nut is the joint. A pipe for piping characterized in that the end of the flexible pipe protruding from the retaining ring is configured to be compressed and deformed between the end face of the joint body and the retaining ring by screwing the male screw portion on the outer surface of the main body and tightening. Coupling device.