Pipe joints or couplings – Connector for conduit housing electromagnetic line: – Having box and connector
Patent
1994-09-16
1996-04-09
Arola, Dave W.
Pipe joints or couplings
Connector for conduit housing electromagnetic line:
Having box and connector
285177, 285192, 285337, 285341, F16L 304
Patent
active
055054994
DESCRIPTION:
BRIEF SUMMARY
This invention concerns pipe couplings.
If a pipe is to be cast into a concrete wall or floor, formwork for the casting has to be altered to allow the pipe to pass through. That is time consuming and hence costly. Furthermore, the altered formwork will be less re-usable. Additional expense arises in supporting the pipe temporarily during casting. Alignment of the pipe is time consuming and difficult and often a source of error.
When alignment of a pipe to be cast in concrete is critical, the general practice is to make a hole in the concrete that is larger than the pipe. The pipe is then positioned later and secondary formwork used for casting concrete about the pipe. Obviously, that involves additional time, work and expense. Furthermore, the additional concrete joints may provide regions of weakness through which leakages may occur. Finally, the concrete may have an inferior surface appearance because of the two casting operations.
An object of this invention is to provide a way of casting pipes into concrete that avoids or at least mitigates against one or more of the above-mentioned disadvantages.
According to the invention there is provided a pipe coupling, which coupling may itself be cast into concrete and to which one or more pipes may be coupled.
A preferred pipe coupling of the invention comprises a sleeve having an external flange for attaching the coupling to formwork for concrete casting. The flange may be integral with or separable from the sleeve. The external flange may be spaced inwardly from one end of the sleeve, whereby a collar or the like may be connected thereto by means for drawing the collar and flange towards each other for urging a sealing ring into sealing contact with a pipe in or through the sleeve. In one preferred embodiment the sealing ring is in a recess of the collar and is compressed between the collar and an end of the sleeve. In another preferred embodiment, the sealing ring is in an annular recess of the sleeve end and is compressed therein by the collar.
Alternatively, an external flange may be at the end of the sleeve for direct connection of a flanged pipe, valve or other piece of pipework to the coupling by any suitable means such as by bolts or by welding.
Pipe couplings of the invention may be provided for single pipe coupling ie., for one side of a concrete wall or floor, or may be provided for coupling to opposite ends thereof. For a single coupling, the sleeve preferably increases in internal diameter from its intended outer end. For a double coupling, the sleeve preferably increases in internal diameter from its ends towards its mid-region. That increase in internal diameter provides some tolerance in alignment of a pipe to be inserted into the coupling.
The external flanges of the couplings of the invention may be tapped for receiving bolts or the like for attaching the couplings to concrete casting formwork. For coupling flanges that are inwards of the sleeve ends packing pieces may be required between the flanges and the formwork. However, once the casting operation has been completed, the formwork may still be re-usable conventionally once any packing is removed.
The external flanges may be provided with anchorages, such as anchor bolts, preferably on their inner faces.
The sleeves of the couplings of the invention may be provided with one or more external puddle flanges. Furthermore, the sleeves may bestepped to accommodate pipes of different diameters at opposite ends of the couplings.
The couplings of the invention may be fixed to formwork for concrete casting in any desired position. Then after casting and removal of the formwork, pipes may be coupled to or through the coupling and sealed about their circumference.
This invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a section through a first coupling according to the invention in situ;
FIG. 2 is a section through a second coupling according to the invention in situ; and
FIG. 3 is a section through a third coupling acco
REFERENCES:
patent: 4071265 (1978-01-01), Wallace
patent: 4071267 (1978-01-01), Davis
patent: 4174126 (1979-11-01), Hauff
patent: 4353580 (1982-10-01), Houck
patent: 5060986 (1991-10-01), Carter
patent: 5293724 (1994-03-01), Cornwall
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