Gravel-like material removing device

Details Gravel-like material removing device Gravel-like material removing device

2005-01-18

2005-01-18

Pezzuto, Robert E (Department: 3671)

Excavating

Beneath a body of water

Suction

Reexamination Certificate

active

06843003

ABSTRACT:
The gravel-or-the-like removing device includes an impeller casing which accommodates an impeller driven by a motor in the inside thereof and has a suction opening at the center of the lower surface, a peripheral wall for preventing collapse and inflow of gravel or the like which is constituted of a cylindrical body which has an upper end thereof connected to a lower portion of the impeller casing and a lower end thereof opened downwardly and forms a water-retention space in the inside thereof, and a water suction pipe which has an upper-end opening thereof opened in water above a gravel-or-the-like piled level and a lower opening thereof communicably connected with the water retention space.

REFERENCES:
patent: 4305214 (1981-12-01), Hurst
patent: 4322898 (1982-04-01), Bos
patent: 4409746 (1983-10-01), Beck
patent: 4456424 (1984-06-01), Araoka
patent: 4596511 (1986-06-01), Weinrib
patent: 4728256 (1988-03-01), Araoka
patent: 4776753 (1988-10-01), Weinrib
patent: 4792275 (1988-12-01), Weinrib
patent: 4914841 (1990-04-01), Weinrib
patent: 5005364 (1991-04-01), Nelson
patent: 5238363 (1993-08-01), Thielke et al.
patent: 5893703 (1999-04-01), Weinrib
patent: 6406635 (2002-06-01), Smith et al.
patent: 53-30652 (1979-03-01), None

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