JPH0110545Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection device for connecting devices (connected subjects) such as a pot and a valve to a gas pipe, a water pipe, or the like.

BACKGROUND ART Conventionally, a connected body such as a gas tank or a valve is used by screwing a connected part provided thereon to a connecting part provided at the end of a gas pipe or water pipe.

As shown in Figure 1, a collar is attached to one end of the connected part 1 of the connected body as a connecting device that allows adjustment of the mounting posture of the connected body and does not require rotation of the connected body during screw connection. A cap nut 3 that engages with the flange part 2 is rotatably fitted onto the connected part, and the cap nut 3 is threadedly connected to the threaded part 5 of the connecting part 4. There is.

In this case, the collar portion 2 is the main body to be connected, that is,
Since it is integrated with the connected part 1, it cannot be used in a type of connected main body in which there is a portion in the vicinity of the flange part 2 with a diameter larger than the inner diameter of the flange 6 of the cap nut 3.

On the other hand, as shown in Figure 2, the collar of the main body to be connected is
It is also possible to replace the C-shaped ring 7 with the C-shaped ring and fit it after inserting the cap nut, but in this case, it is necessary to fit the C-shaped ring with the cap nut 3 retracted. , sufficient sliding clearance is required between the C-shaped ring 7 and the end face of the enlarged portion 8.

The present invention is to reduce the distance between the C-shaped ring and the end face of the enlarged part 8 in this type of connecting device in which a cap nut can be attached from the tip side of the connected part of the main body to be connected. With the goal.

The technical means of the present invention taken to solve the above problems is to provide a first annular groove for externally fitting a C-shaped ring on the outer periphery near the tip of the cylindrical connected part, and A second annular groove for fitting the C-shaped ring is provided on the inner periphery near the end opposite to the threaded part of the cap nut to be fitted, and the second annular groove is connected to the large diameter part and the small diameter part continuing outside of this. Furthermore, a C-shaped ring comprising a tapered part connecting the large diameter part and the small diameter part and fitting externally into the first annular groove and internally into the second annular groove is interposed between the connected part and the cap nut. The diameter of the large diameter portion is set to be slightly larger than the outer diameter of the C-shaped ring in a free state, and the distance between the annular bottom of the first annular groove and the small diameter portion is slightly larger than the difference between the inner and outer radii of the C-shaped ring. This is because we have set a large number of

According to the above technical means of the present invention, the C-shaped ring is fitted in advance into the large diameter portion of the second annular groove of the cap nut, and the C-shaped ring is pushed and expanded from the threaded portion side of the cap nut. When the connected portion of the connected main body is inserted from the opposite side of the threaded portion, the C-shaped ring is once fitted into the vicinity of the first annular groove on the distal end side of the connected portion. In this state, the C-shaped ring is engaged in the second annular groove of the cap nut and is located at the large diameter portion. If you push the connected part further from this state, the first and second
When the annular grooves are aligned, the inner peripheral side of the C-shaped ring is fitted into the first annular groove, and the cap nut is rotatably attached to the connected portion. At this time, the C-shaped ring is located on the large diameter side of the second annular groove.

Next, a packing member is interposed between the tip of the connected part and the connected part, and the cap nut is screwed onto the threaded part of the connected part and tightened. pressed to the side. At this time,
The outer diameter of the C-ring is reduced by the tapered part connecting the large-diameter part and the small-diameter part of the second annular groove, and the peripheral wall of the small-diameter part comes into contact with the outer periphery of the C-shaped ring. The connected portion is pressed against the connecting portion depending on the tightening force.

Since the cap nut is attached to the connected part as described above, the distance between the first annular groove of the connected part and the end face of the enlarged part 8 is from the second annular groove of the cap nut to the end face near it. The distance between the C-shaped ring and the end face of the enlarged portion 8 of the object to be connected can be set small.

Since the present invention has the above configuration, it has the following unique effects.

(1) In the connected state of the connected entity, the C-shaped ring is
It is located between the small diameter portions of the first annular groove and the second annular groove, and there is extremely little room for movement of the C-shaped ring within these groove portions. Therefore, the eccentricity of the connected portion, the C-ring, and the cap nut is extremely reduced, and it is possible to prevent the cap nut from coming off due to eccentricity between these three components.

The above-mentioned cap nut and the connected portion are more likely to disengage from each other as the tightening force increases, but for the above-mentioned reason, there is an advantage that the tightening force can be increased.

(2) In addition, in order to prevent eccentricity between the C-ring, the connected part, and the cap nut, the second annular groove is provided only in the large diameter part, and a back-up screw is inserted through the bottom of the large diameter part. It is also possible to consider a method in which a plurality of C-shaped rings are screwed together in the radial direction and the diameter of the C-shaped ring in a free state is reduced by screwing in the back-up screw, but according to the above structure of the present invention, the back-up screw as in the above method is not required. This also eliminates the need for screw-in work.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4. In this embodiment, the main body to be connected is a gas tank, and the connected part 1 becomes the gas inlet of the gas tank. On the other hand, the connecting part 4 is a gas pipe, and a threaded part 5 is formed at the end thereof, into which the threaded part of the cap nut 3 externally fitted onto the connected part 1 is screwed. Further, a fitting cylinder part 10 is provided at the tip of the connected part 1 so that it fits inside the connecting part 4, and a first step part 11 is provided at the proximal end of the fitting cylinder part. A second step portion 12 following this is provided, and a sealing gasket 13 is attached to this second step portion. This first step portion 11 is in contact with the end surface of the connecting portion 4, and in this abutting state, the packing 1 of the second step portion 12 is
3 is pinched between the second stage portion and the end face of the connecting portion 4, and exhibits a sealing function of the connecting portion.

Next, the second annular groove 14 of the cap nut 3 is connected to the threaded portion 9.
The large diameter portion 1 is provided at the opposite end of the
5. The tapered part 16 and the small diameter part 17 are continuous, and the annular thick part between the small diameter part 17 and its outer end surface corresponds to the inner peripheral flange part 2 of a conventional cap nut.

As shown in FIG. 4, the C-shaped ring 18 is once fitted into the second annular groove 14 of the cap nut 3, and then inserted into the first annular groove 19 of the connected part 1 of the main body to be connected in the previously described procedure. The C-shaped ring 18 is fitted and the cap nut 3 is installed in a manner that prevents it from coming off.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the conventional example, FIG. 3 is an exploded view of the embodiment of the present invention, and FIG. 4 is a sectional view of the connected state. In the figures, 1...connected part, 3... ... Cap nut, 4 ... Connection part, 5 ... Threaded part, 14 ... Second annular groove, 15 ...
...Large diameter part, 16...Tapered part, 17...Small diameter part, 18...C-shaped ring, 19...First annular groove.

Claims (1)

[Scope of utility model registration request] In the flow path connecting device, a cap nut is attached to the connected part of the connected body using a C-shaped ring so as to prevent it from coming out, and the connected body is screwed to the other connecting part by the cap nut. A first annular groove for externally fitting the C-shaped ring is provided on the outer periphery near the tip of the cylindrical connected part, and a first annular groove for externally fitting the C-shaped ring is provided near the end opposite to the threaded part of the cap nut to be externally fitted into the connected part. A second annular groove for fitting inside the C-shaped ring is provided on the inner periphery, and the second annular groove is connected to a large diameter portion, a small diameter portion continuing to the outside of this, and a tapered portion connecting the large diameter portion and the small diameter portion. A C-shaped ring that fits externally into the first annular groove and internally fits between the second annular groove is interposed between the connected part and the cap nut, and the diameter of the large diameter part is set to the diameter of the C-shaped ring. A flow path connecting device in which the outer diameter is set to be slightly larger than the outer diameter in a free state, and the distance between the annular bottom of the first annular groove and the bottom of the small diameter part is set to be slightly larger than the difference between the inner and outer radii of the C-shaped ring.