Smoke exhauster having improved fan device

Details Smoke exhauster having improved fan device Smoke exhauster having improved fan device

2005-09-20

2005-09-20

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Perimetric blading extending axially between annular members

C416S18600A, C416S187000, C416S21400A

Reexamination Certificate

active

06945753

ABSTRACT:
A smoke exhauster includes a motor attached to a housing, and a fan device attached to the motor and to be driven by the motor. The fan device including an upper plate, a lower plate having a bore, and a number of fan blades secured between the upper and the lower plates to form a chamber between the upper and the lower plates and to allow air to flow into the chamber of the fan device via the bore of the lower plate. Each of the fan blades includes a lower cut-off portion to allow the air to flow deeper into the chamber of the fan device before contacting with or scooped by the fan blades.

REFERENCES:
patent: 1730372 (1929-10-01), Laurie
patent: 1876518 (1932-09-01), Mathis
patent: 2803398 (1957-08-01), Sprouse
patent: 4418261 (1983-11-01), Jailor et al.
patent: 5035398 (1991-07-01), Chiang
patent: 5979436 (1999-11-01), Chiang et al.
patent: 5988979 (1999-11-01), Wang
patent: 6782885 (2004-08-01), Chiang et al.
patent: 2003/0101985 (2003-06-01), Chiang et al.

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