Coupling

Details Coupling Coupling

1983-06-02

1986-11-18

Arola, Dave W.

Pipe joints or couplings

Frangible element

Score line or groove

285 64, 285 93, 285192, 285383, 285423, 285901, 285915, 52221, 52699, 52701, 264 31, 264333, 249177, F16L 3500

Patent

active

046231706

ABSTRACT:
An improved coupling (10) to be embedded in concrete (101) is described. The coupling includes multiple concentric rings (11c) on an outside wall (11a) of a tube (11) which aid in preventing leakage along the outside wall and which help in providing fire retardancy. The coupling includes a step form (14) having a regular diameter which aids in positioning the coupling using a template (105).

REFERENCES:
patent: 1044347 (1912-11-01), Carlson
patent: 1185846 (1916-06-01), Simpson
patent: 2449265 (1948-09-01), Williams
patent: 2837750 (1958-06-01), Robinson
patent: 3265349 (1966-08-01), Hamrick
patent: 3761601 (1973-09-01), Kaesser
patent: 3933336 (1976-01-01), Tolf
patent: 4019760 (1977-04-01), Streit
patent: 4086736 (1978-05-01), Landrigan
patent: 4238131 (1980-12-01), Cleveland
patent: 4261598 (1981-04-01), Cornwall
patent: 4313286 (1982-02-01), Harbeke
patent: 4453354 (1984-06-01), Harbeke
patent: 4453749 (1984-06-01), McKinnon
patent: 4488388 (1984-12-01), Schmidt

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