Sewer and drain plug

Details Sewer and drain plug Sewer and drain plug

1983-02-18

1984-07-17

Marcus, Stephen

Pipes and tubular conduits

With closures and plugs

Test plugs

73 491, G01M 302

Patent

active

044600194

ABSTRACT:
A plug for sealing a sewer or drain conduit and for simultaneously filling the conduit so that the drainage system may be inspected for leaks. A tubular bulb made of an elastomeric material has fluid under pressure supplied to its internal cavity from one end. The bulb expands laterally of its longitudinal axis to thereby seal the conduit in which it is located. Thereafter, a spill over valve coupled to the other end of the bulb releases fluid from the bulb while maintaining the expanded size of the bulb and the sealing engagement between the bulb and the conduit. The bulb may have an external waffle surface to enhance sealing and reduce the likelihood of bulb rupture from sharp pipe edges. The spill over valve includes external channels through which fluid may pass upon sufficient expansion of the overlying bulb. Embodiments are disclosed which include a second bulb for sealing a branch conduit. One of the dual bulb embodiments has a control valve for selectively permitting both bulbs to be simultaneously inflated, both bulbs to be simultaneously deflated, and the second bulb to be deflated independent and prior to the deflation of the first bulb.

REFERENCES:
patent: 1180282 (1916-04-01), Bunn
patent: 2177916 (1939-10-01), Thomas et al.
patent: 2279257 (1942-04-01), Svirsky
patent: 2309429 (1943-01-01), Ahern
patent: 3431945 (1969-03-01), Robillard
patent: 3595255 (1971-07-01), Mullinex
patent: 3792708 (1974-02-01), Tash
patent: 3802449 (1974-04-01), Mullinex
patent: 3840033 (1974-10-01), Warsinger
patent: 4337813 (1982-07-01), Rach et al.

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