Pipe joints or couplings – For branched path – T-type
Patent
1991-03-14
1993-06-01
Arola, Dave W.
Pipe joints or couplings
For branched path
T-type
285305, 285373, 285423, 285906, 285915, F16L 4700
Patent
active
052153371
ABSTRACT:
A plastic pipe seal for dual wall plastic pipe includes a plastic single piece or multi-piece fitting formed of rigid plastic sheet. At each inlet to the fitting, two formed grooves are radial to the line of flow through the fitting. The groove closest to the fitting inlet mates with a corresponding groove on the pipe, which groove receives a mechanical retainer. A second radial groove spaced from the retaining groove holds a gasket sealing device which provides a seal between the inside of the fitting and the outside diameter of the pipe. The retainer can be an extruded or molded plastic or metal spring cut to appropriate size, or a dual durometer structure, which allows for compression to a solid retainer.
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patent: 4869534 (1989-09-01), Ketcham et al.
patent: 4870856 (1989-10-01), Shorp
patent: 4923350 (1990-05-01), Hinksman et al.
McPherson Terry R.
Spirkowyc Paul A.
Arola Dave W.
Dougherty Ralph H.
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