Pipe joints or couplings – Essential catch – Resilient ring
Patent
1991-05-15
1993-01-05
Reese, Randolph A.
Pipe joints or couplings
Essential catch
Resilient ring
285340, 285276, 285917, 2771675, F16L 2100
Patent
active
051764130
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to union devices for pipe joints and more specifically to such a union, which keeps the pipes securely together on being joined, and where the union can only be disconnected using special measures.
When pipes are laid to form an entire pipeline, there is generally the desire of fixing the pipes to each other so that they will not be separated, e.g. should there be settlements in the pipeline trench. When pipes are inserted in existing pipelines, it may be necessary on many occasions to pull the pipes through these pipelines, and in such a case it is necessary that the joints are securely made. In certain cases, there is a requirement that the joints shall withstand a tensile load of up to 2000 kp.
Particularly in lining pipelines, there must not be any parts projecting inwards or outwards of the pipes at the joints, since in both cases the maximum diameter of the relining pipeline will be restricted. Both the joint and the union must therefore lie within the normal wall thickness of the lining pipe.
SUMMARY OF THE INVENTION
The present invention has the object of achieving such a pipe joint, which solves the problems mentioned above in a desired manner. This object is achieved by a union device of the kind disclosed in the claims, and what particularly characterizes the invention will also be apparent from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail and in connection with the accompanying drawings, where
FIG. 1 is a perspective view of a locking ring used in the union device in accordance with the invention,
FIG. 2 is an enlarged cross section through the locking ring of FIG. 1,
FIG. 3 is a fragmentary section through the male and female part of a pipe joint intended for the union device in accordance with the invention,
FIG. 4 illustrates a male and a female part at the beginning of fitting, with a locking ring placed in the female part, and
FIGS. 5-7 show how the union is achieved during the fitting process.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 2 there is shown a female part 1 and a male part 2 in fragmentary schematic cross section. From its outer radial end surface 3, the female part 1 has a first part 4 tapering to a decreased diameter inwards, a second part 5 in the form of a circular groove with a bottom parallel to the outside of the female part 1, and a third part 6 which is similarly tapered with reducing diameter inwards to terminate at a radially inwardly directed wall 7, in turn terminating at the inside 8 of the pipe.
The male part 2 has to a large extent a configuration complemental to the female part 1, so that it can be inserted in the latter. From its radially outward end surface 9 the male part 2 has a first part 10 complemental to the part 6 in the female part 1, a second part 11 which is an outwardly directed circular groove intended to be directly opposite the groove 5 in the female part, but having a first straight part 12 and a second tapering part 13, the male part also having a third part 14 complemental to the part 4 of the female part 1. The grooves 5 and 11 are intended to accommodate a locking ring, while the part 14 terminates in a radially outwardly directed end wall 15. The end walls 7 and 15 mate up with the end surfaces 9 and 13 respectively.
Although the male and female parts 2, 1 described here having tapering surfaces or parts, it will be understood by one skilled in the art that these can also have other configurations such as curved, cylindrical etc. without departing from the inventive concept.
The locking ring itself is illustrated in FIGS. 1 and 2 and is to be accommodated in the grooves 5 and 11 when the union is made in the pipe joint. As is most easily seen in FIG. 2, the locking ring 16 is conical with an outer surface 17 and an inner surface 18, these two surfaces being substantially parallel. At the narrow end of the inner surface 18 there is a short cylindrical part 19 and at the wide end of the outer surface 17 there is also
REFERENCES:
patent: 1821866 (1931-09-01), Wilson
patent: 3381983 (1965-08-01), Hanes
patent: 3389923 (1967-11-01), Love, Jr. et al.
patent: 3776576 (1973-12-01), Keyser
patent: 4168237 (1979-09-01), Pickett et al.
Aberle Timothy
Reese Randolph A.
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