Fluid reaction surfaces (i.e. – impellers) – Protective screen or guard – Water or marine propellers
Patent
1997-07-24
1999-08-31
Lopez, F. Daniel
Fluid reaction surfaces (i.e., impellers)
Protective screen or guard
Water or marine propellers
4151212, F04D 2964
Patent
active
059444886
ABSTRACT:
A tube axle fan assembly comprising a tubular housing and resiliently deformable, convex guards that removably, snap fit to each fan end. A motor and associated components are mounted in the housing upon a bracket having two spaced-apart feet that form a triangular brace. A pivoted bracket mounts the motor such that the pull of gravity tends to tighten the drive belt entrained about the pulleys. The housing comprises a cylindrical, hollow body having input and output ends with diameters smaller than the guard outside diameter. A reinforcing channel is formed in each end of the housing to retain the seated guard. Each guard comprises a circular wire frame that assumes a dome-like configuration. Each guard has a series of radially spaced-apart spokes emanating from a central hub which must be arched to clear the smaller diameter of the housing. The spokes are reinforced by a continuous wire spiral that circumscribes the hub. The guards may be resiliently removed from the channel by exerting an outward force on a spoke that causes the central hub to flex outwardly while the radial spokes deform from their seated positions. A tool for removing and installing guards comprises an elongated shaft having a forked end and a spaced-apart hooked end.
REFERENCES:
patent: 2735611 (1956-02-01), McLean
patent: 4239459 (1980-12-01), Felter
patent: 4242055 (1980-12-01), Felter
patent: 4865289 (1989-09-01), Lawson
patent: 5348447 (1994-09-01), Redetzke
patent: 5441391 (1995-08-01), Frost et al.
Carver Stephen D.
Lopez F. Daniel
Triangle Engineering of Arkansas Inc.
Woo Richard
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