JPH05164277A - Pipe joint - Google Patents

Abstract

PURPOSE:To provide a pipe joint which can be connected simply without using a spanner or other tool and so reliably that it will not become loose. CONSTITUTION:A cap nut 4 is mounted rotatably on the outer circumference of a first member 1 at one side of a pipe joint. A seal ring 3 is mounted on the outer circumference of an insertion cylinder 5 at an end of the first member 1, and also a stopper projection 9 is provided on the outer circumference of the base portion of the insertion cylinder 5. An outer cylinder 6 is fitted onto the insertion cylinder 5 until its end contacts with the stopper projection. A female screw portion 11 of the cap nut 4 is screwed onto a male screw portion 10 on the outer circumference of the outer cylinder 6, and an engaging flange portion 7 of the cap nut 4 is confronted with an engaging flange portion 7 of the insertion cylinder 6. A band 8 which is approximately C-shaped and elastic is fitted onto the outer circumference of the confronting engaging flange portion 7, and also a pair of the engaging flange portions 7 which confront an engaging slit 12 provided on the band 8 are fitted and engaged.

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 connecting a gas pipe or the like, and more particularly to a pipe joint used for easily connecting a portion where connection is difficult.

[0002]

2. Description of the Related Art Heretofore, there have been pipe fittings shown in FIGS. 8 and 9 which are relatively easy to connect. In the pipe joint shown in FIG. 8, the tip of the tubular first member 1'is brought into contact with the tip of the tubular second member 2'through a seal ring 3 ', such as an O-ring, to contact the tip of the tubular first member 1'. A cap nut 4'which is rotatably mounted on the outer circumference is screwed and connected to the outer circumference of the second member 2 '. The pipe joint shown in FIG. 9 has a cylindrical first member 1 ″, an insertion cylinder 5 ″, and a cylindrical second member 2 ″, which is fitted with a fitting cylinder 6 ″. The outer circumference of the seal ring 3 ″ such as the worn O-ring is brought into close contact with the inner circumference of the fitted tube 6 ″, and the locking flange 7 ″ on the outer circumference of the first member 1 ″ and the locking flange of the second member 2 ″. A retaining member 8 ″ is fitted on the outer periphery so as to face the portion 7 ″ and prevent the pair of locking collar portions 7 ″ from separating.

[0003]

However, since the former conventional example shown in FIG. 8 is connected only by tightening the cap nut 4 ', the connection may be disconnected unless the cap nut 4' is strongly tightened. Therefore, there is a problem that it is necessary to strongly tighten with a tool such as a wrench and experience is required for the construction, and a tool such as a wrench is required, so that there is a problem that a space for moving the tool is required. Further, the latter conventional example shown in FIG. 9 has a problem that the strength of the connection is weak because it is held only by the locking of the retaining member 8 ″ against pulling, and the first member 1 ″. When the retaining member 8 "is fitted by fitting the second member 2" and the second member 2 ", spring back occurs so that the first member 1" and the second member 2 "are separated from each other. There is a problem that a strong force is required to attach the 8 ″, and there is a problem that rattling at the connecting portion cannot be stopped.

The present invention has been made in view of the above problems, and the object of the present invention is to make a simple connection without using a tool such as a spanner, and to ensure that the connection is not loose. It is to provide a pipe joint that can be easily connected even if the springback is large when connecting.

[0005]

In order to achieve the above object, the pipe joint of the present invention is a pipe joint in which a tubular first member 1 and a tubular second member 2 are connected. Member 1
A cap nut 4 is rotatably mounted on the outer periphery of the insertion tube 5, a seal ring 3 is mounted on the outer periphery of an insertion tube 5 provided at the tip of the first member 1, and a stopper projection 9 is provided on the outer periphery of the base of the insertion tube 5. The fitted cylinder 6 provided at the tip of the second member 2 is fitted to the insertion cylinder 5, and the tip of the fitted cylinder 6 is brought into contact with the stopper projection 9 to be provided on the outer circumference of the fitted cylinder 6. The male screw portion 10 is screwed into the female screw portion 11 on the inner circumference of the cap nut 4, and the locking collar portion 7 provided on the outer periphery of the tip of the cap nut 4 and the locking collar portion 7 provided on the base portion of the fitted tube 6 are connected to each other. And a substantially C-shaped elastic band 8
Are fitted to the outer periphery of the facing locking collar 7 and the band 8
Pair of locking collars 7 facing the locking slits 12 provided on the
Was fitted and locked.

[0006]

When the first member 1 and the second member 2 are connected, the fitting cylinder 6 of the second member 2 is inserted into the insertion cylinder 5 of the first member 1, the cap nut 4 is rotated, and the female screw portion 11 is externally threaded. The end of the insertion tube 5 is brought into contact with the stopper projection 9 by screwing it into the portion 10 and tightening it, and the pair of locking collar portions 7 are brought close to each other, and the band 8
Is fitted to fit the locking slit 12 of the band 8 into the locking flange 7. At this time, screw with the cap nut 4 and the band 8
It is connected by locking and is firmly connected in the pulling direction. Further, since the cap nut 4 can be prevented from being loosened by the band 8, the cap nut 4 can be tightened with no tool such as a spanner, and the connection can be easily performed. Further, since the connection is made by screwing the cap nut 4, the connection can be easily made even if there is a spring back at the time of connection.

[0007]

[Embodiment] In the present embodiment, a pipe joint used to connect a gas pipe attached to a built-in type oven and a gas pipe on the stove side. The pipe joint comprises a tubular first member 1 and a tubular second member 2 as shown in FIGS. 1, 2 and 3.
The subject is composed of and. The gas pipe attached to the oven side is formed of a metal flexible pipe 13, and the first member 1 is integrally attached to one end of the flexible pipe 13. A screw type female socket 14 is integrally provided at the other end of the flexible tube 13, and the screw type female socket 14 is previously screwed into an oven for connection. As shown in FIG. 4, an insertion tube 5 is provided at the tip of the first member 1, and a ring-shaped recess 15 is provided on the outer circumference of the insertion tube 5 over the entire circumference. A seal ring 3 such as an O-ring is attached. On the base of the insertion tube 5, a stopper projection 9 is provided in the circumferential direction. A cap nut 4 as shown in FIG. 5 is rotatably mounted on the outer periphery of the first member 1, and is attached by a stopper 9 so that the cap nut 4 does not come off. A locking collar 7 is integrally formed on the outer periphery of the tip of the cap nut 4. The second member 2 is integrally attached to the end portion of the gas supply pipe 18 that is piped from the stove side. Second member 2
As shown in FIG. 6, a fitting cylinder 6 which can be fitted to the outer circumference of the insertion cylinder 5 is provided at the tip end of the fitting cylinder 6, and the female screw portion 11 of the cap nut 4 is screwed onto the outer circumference of the fitting cylinder 6. A male screw portion 10 for obtaining is provided. A locking collar 7 is provided on the base of the fitted cylinder 6 so as to project over the entire circumference. The band 8 is formed of a metal spring material in a substantially C shape and has a locking slit 12 formed in the circumferential direction.

However, the connection of the first member 1 and the second member 2 is performed as follows. First, the fitted cylinder 6 of the second member 2 is fitted on the outer periphery of the insertion cylinder 5 of the first member 1, the tip of the fitted cylinder 6 is abutted against the retaining projection 9, and the cap nut 4 is turned by hand to form a bag. The female threaded portion 11 of the nut 4 is screwed into the male threaded portion 10 of the insertion tube 5 and tightened to bring the pair of locking collar portions 7 close to each other. Next, the band 8 is fitted onto the outer circumferences of the pair of locking flanges 7, and the locking slits 12 are locked to the pair of locking flanges 7.
In this way, the first member 1 and the second member 2 have the cap nut 4
Are screwed together and tightened by the band 8 to be connected.

FIG. 7 shows another embodiment. In the case of this embodiment, a taper surface 16 is provided on the outer surface side of the locking collar portion 7, and a minute gap S is formed between the inner surfaces of the pair of locking collar portions 7. In this case, the locking slit 12 of the band 8 comes into contact with the tapered surface 16, and the force of the band 8 to reduce its diameter receives a force in the direction in which the pair of locking brim portions 7 approach each other. Be certain.

[0010]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is connected by screwing with a cap nut and locking of the band, and is firmly connected in the pulling direction. Since the nut can be prevented from loosening, a tool such as a spanner is not required to tighten the cap nut, and the connection can be done easily even in a narrow space. Even if there is, it can be easily connected, and since the cap nut is tightened after the insertion cylinder of the second member is fitted to the insertion cylinder of the second member, it is temporarily connected when tightening the cap nut. The cap nut can be easily tightened and the connection can be facilitated also in this respect.

[Brief description of drawings]

FIG. 1 is a partially omitted half sectional view of an embodiment of the present invention.

FIG. 2 is an exploded cross-sectional view of a main part of the above.

FIG. 3 is an exploded perspective view of a main part of the above.

FIG. 4 is a half sectional view of the above first member.

5A and 5B show the cap nut of the above, wherein FIG. 5A is a half sectional view seen from the front, and FIG. 5B is a side view.

6A and 6B show a second member of the above, wherein FIG. 6A is a half sectional view seen from the front, and FIG. 6B is a side view.

FIG. 7 is a sectional view of a main part of another embodiment of the above.

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 3 Seal ring 4 Cap nut 5 Insertion cylinder 6 Fitting cylinder 7 Locking collar part 8 Band 9 Abutting stop protrusion 10 Male screw part 11 Female screw part 12 Locking slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Miyoshi Nishikawa, 1-52, Minami-shi Oka, Minato-ku, Osaka 1-52 Harman Co., Ltd. (72) Inventor, Tetsuji Harada 1-52, Minami-shi Oka, Minato-ku, Osaka Herman Co., Ltd. (72) Inventor Toshinoma Mimura 1-52, 1-52 Oka, Minami-shi, Minato-ku, Osaka Harman Co., Ltd. Inventor Takeshi Nakagawa 2-10-16 Minamikagaya, Suminoe-ku, Osaka City Shinwa Sangyo Co., Ltd.

Claims (1)

[Claims] 1. A pipe joint for connecting a tubular first member and a tubular second member, wherein a cap nut is rotatably attached to the outer periphery of the first member, and the tip of the first member is attached. A seal ring is attached to the outer circumference of the insertion cylinder provided in the section, and a stopper projection is provided on the outer circumference of the base of the insertion cylinder, and the fitting cylinder provided at the distal end of the second member is fitted to the insertion cylinder and fitted. The tip of the fitting cylinder is brought into contact with the above-mentioned stopper stopper, and the female thread portion of the inner circumference of the cap nut is screwed into the male screw portion provided on the outer circumference of the fitting cylinder, and the locking collar portion provided on the outer circumference of the tip of the cap nut. And a locking brim provided on the base of the fitted cylinder are opposed to each other, and a substantially C-shaped band having a spring property is fitted on the outer circumference of the facing locking brim and a locking slit provided on the band. A pipe joint formed by fitting and locking a pair of opposing locking collars.