Compression screw with combination single and double flights

Details Compression screw with combination single and double flights Compression screw with combination single and double flights

2008-04-15

2008-04-15

Nguyen, Jimmy T. (Department: 3725)

Presses

With drain means for expressed liquid

Drainage through or along pressure surface

C100S145000, C210S413000

Reexamination Certificate

active

07357074

ABSTRACT:
A screw for a compression dewatering device comprising an elongated shaft having axially spaced apart first and second ends, a conveying section at the first end of the shaft, having a single helical screw flight rigidly projecting from the shaft, a flightless transition section axially adjacent the conveying section, and a dewatering section axially adjacent the transition section, having a double helical screw flight rigidly projecting from the shaft. Another embodiment is a compression screw with similar characteristics having a perforated tubular dewatering wall intermediate the ends, followed by an imperforate spool wall at the discharge end. A gravity feed device is operatively associated with the inlet end of the screw shaft for depositing bulk solids material through the feed opening onto the conveying screw, and a drive system is operatively connected to the inlet end of the screw for rotating the screw in the housing.

REFERENCES:
patent: 3892173 (1975-07-01), Hall et al.
patent: 4581992 (1986-04-01), Koch
patent: 5516427 (1996-05-01), Yoshikawa
patent: 6550376 (2003-04-01), Johnston
patent: 59166396 (1984-09-01), None
patent: 299161 (1998-08-01), None

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