Excavating – Beneath a body of water – Suction
Reexamination Certificate
1999-09-20
2001-07-24
Will, Thomas B. (Department: 3671)
Excavating
Beneath a body of water
Suction
C037S346000, C037S307000
Reexamination Certificate
active
06263594
ABSTRACT:
BACKGROUND OF THE INVENTION
The conventional dredge rotates on a vertical spud driven into the bottom of the channel in which the dredge is operating. A ladder extending from the front of the dredge supports a suction pipe, which is conventionally made of steel. Slightly in front of the suction pipe is a rotating cutter. The ladder swings vertically. When the ladder is swung down about 45 degrees the ladder is near its maximum angle for digging a channel.
SUMMARY OF THE INVENTION
The present invention is useful for dredging underneath a floating vessel, where a conventional dredge cannot reach the location of the material to be dredged. A neutral buoyancy pipe is attached to the end of the suction pipe and acts as an extension of the suction pipe. The vertical position of the neutral pipe is controlled by adjusting the buoyancy of the neutral buoyancy pipe. The horizontal position of the neutral buoyancy pipe is controlled both by the anchoring system which sweeps the dredge back and forth and by a position adjusting system at the forward end of the neutral buoyancy pipe.
The invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others, and the apparatus embodying features of construction, combinations of elements and arrangements of parts which are adapted to effect such steps, all as exemplified in the following detailed disclosure, and the scope of the invention will be indicated in the claims.
REFERENCES:
patent: 3757369 (1973-09-01), Laarman
patent: 3812922 (1974-05-01), Stechler
patent: 3919791 (1975-11-01), Smith
patent: 4087981 (1978-05-01), Norman
patent: 4108499 (1978-08-01), Sandberg
patent: 4242816 (1981-01-01), Jeanson
patent: 4696607 (1987-09-01), Ressi Di Cervia
patent: 5285587 (1994-02-01), Krenzler
patent: 5491913 (1996-02-01), Hutchinson
patent: 5913604 (1999-06-01), Brouwer et al.
Banner & Witcoff , Ltd.
Markovich Kristine
Will Thomas B.
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