Housing type pipe coupling

Details Housing type pipe coupling Housing type pipe coupling

1998-12-22

2001-05-08

Nicholson, Erick K. (Department: 3627)

Pipe joints or couplings

With fluid pressure seal

Flexible lip

Reexamination Certificate

active

06227577

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a housing type pipe coupling creating a nonleaking union between ends of a pair of pipes butting each other.
BACKGROUND ART
A housing type pipe coupling as shown in
FIG. 6
is used widely in industries for creating a nonleaking union between ends of adjacent pipes butting each other.
This known housing type pipe coupling comprises a pair of semi-circular coupling segments
1
and
2
each having a shape substantially resembling a circular arc and each provided with a circular space
6
for receiving end parts of pipes
4
and
5
provided, respectively, with circumferential grooves
3
, and fastening walls
8
and
9
formed on the opposite sides of the circular space
6
and capable of being fitted in the circumferential grooves
3
of the pipes
4
and
5
, a sealing elastic ring
7
to be disposed in the circular spaces
6
to create a nonleaking union between the ends of the pipes
4
and
5
, and fastening means
10
for fastening together the two circular coupling segments
1
and
2
.
This housing type pipe coupling compresses the elastic sealing ring
7
placed in the semi-circular spaces
6
of the circular coupling segments
1
and
2
on the outer circumferences of the end parts of the two pipes
4
and
5
to create a nonleaking union between the ends of the pipes
4
and
5
, and fixes the semi-circular coupling segments
1
and
2
to the pipes
4
and
5
by pressing the circular fastening walls
8
and
9
against a bottom of the circumferential grooves
3
formed in the end parts of the two pipes
4
and
5
.
In this housing type pipe coupling, the circular fastening walls of the semi-circular coupling segments must be formed in dimensions such that the inner circumferences of the circular fastening walls can be pressed against the bottoms of the circumferential grooves formed in the end parts of the pipes. However, pipes of the same nominal diameter have different diameters, and the circumferential grooves are often formed in different depths, so that the pressure exerted by the circular fastening walls on the bottom surfaces of the circumferential grooves is often not constant. Consequently, it is possible that the circular fastening walls are not fastened firmly to the pipes, the end parts of the two pipes cannot be firmly joined together, the end parts of the two pipes extend, contract or bend, or the elastic sealing ring is distorted in the circular spaces.
DISCLOSURE OF THE INVENTION
The present invention has been made in view of the foregoing problems and it is therefore an object of the present invention to provide a housing type pipe coupling capable of surely fastening together ends of adjacent pipes and of preventing an elastic ring disposed in a space thereof from being distorted even if the depth of circumferential grooves formed in end parts of the adjacent pipes are different from a prescribed depth.
According to one aspect of the present invention, a housing type pipe coupling comprises: a pair of semi-circular coupling segments each having a space for receiving end parts of two pipes each provided with a circumferential groove defined by at least, a side surface nearer to the end of the pipe and a side surface farther from the end of the pipe; a sealing elastic ring placed in the space defined by the pair of semi-circular coupling segments to create a nonleaking union between the ends of the two pipes; and fastening means for fastening together the pair of semi-circular coupling segments. In this housing type pipe coupling, each of the semi-circular coupling segments has pipe fastening parts respectively on the opposite sides of the space, the pipe fastening parts have opposite end sections with respect to a circumferential direction, and extend radially inward into the circumferential grooves of the two pipes, respectively, one of the pipe fastening parts of the semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential groove of one of the pipes nearer to the end of the same pipe in one of the end sections thereof with respect to a circumferential direction, and a protrusion to be in contact with the side surface of the circumferential groove of the same pipe farther from the end of the same pipe in the other end section thereof with respect to the circumferential direction, and the other pipe fastening part of the same semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential groove of the other pipe farther from the end of the same pipe in one of the end sections thereof with respect to the circumferential direction, and a protrusion to be in contact with the side surface of the circumferential groove of the same pipe nearer to the end of the same pipe in the other end section thereof with respect to the circumferential direction. The protrusions formed in the pipe fastening parts are pressed against the side surfaces of the circumferential grooves of the pipes to fasten surely together the end parts of the pipes to prevent the end parts of the pipes from extending, contracting or bending, and to prevent the elastic sealing ring from being distorted in the space.
According to another aspect of the present invention, a housing type pipe coupling comprises: a pair of semi-circular coupling segments each having a space for receiving end parts of two pipes each provided with a circumferential rib having a side surface nearer to the end of the pipe and a side surface farther from the end of the pipe; a sealing elastic ring placed in the space defined by the pair of semi-circular coupling segments to create a nonleaking union between the ends of the two pipes; and fastening means for fastening together the pair of circular coupling segments. In this housing type pipe coupling, each of the semi-circular coupling segments has pipe setting parts respectively on the opposite sides of the space, the pipe setting parts have recesses for receiving the circumferential ribs of the pipes, the recess has a pair of side surfaces having, opposite end sections with respect to a circumferential direction, the recess of one of the pipe setting parts of the semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential rib of one of the pipes farther from the end of the same pipe in one of end sections thereof with respect to the circumferential direction, and a protrusion to be in contact with the side surface of the circumferential rib of the same pipe nearer to the end of the same pipe in the other end section thereof with respect to the circumferential direction, and the recess of the other pipe setting part of the same semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential rib of the other pipe nearer to the end of the same pipe in one of the end sections thereof with respect to the circumferential direction, and a protrusion to be in contact with the side surface of the circumferential rib of the same pipe farther from the end of the same pipe in the other end section thereof with respect to the circumferential direction. The protrusions formed in the pipe setting parts are pressed against the side surfaces of the circumferential ribs of the pipes to fasten surely together the end parts of the pipes to prevent the end parts of the pipes from extending, contracting or bending, and to prevent the elastic sealing ring from being distorted in the space.


REFERENCES:
patent: 3756629 (1973-09-01), Gibb
patent: 5058931 (1991-10-01), Bowsher
patent: 5121946 (1992-06-01), Jardine
patent: 5246257 (1993-09-01), Kojima et al.
patent: 2227065 (1990-07-01), None
patent: 94/03751 (1994-02-01), None

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