Brakes – Operators – Speed-responsive
Reexamination Certificate
2007-05-22
2007-05-22
McClellan, James (Department: 3683)
Brakes
Operators
Speed-responsive
C188S082700, C188S082770
Reexamination Certificate
active
10870978
ABSTRACT:
A fan rotor is mounted on a shaft carried on bearings attached to a base plate and there is provided an assembly for preventing reverse rotation of the fan which could damage the motor. A stop plate is mounted on the base adjacent the shaft with an edge adjacent the shaft. A pair of wing members are carried on the shaft on two collar pieces so that each wing member is pivotal between ends of the collar pieces about an axis parallel to the tangent to the shaft at the wing member. The wing members are V-shaped and pivot so that one leg moves under gravity either in the vertical or horizontal orientations of the shaft from a retracted position, in which it is free from the stop plate to an extended position in which it engages the abutment surface of the stop member to prevent reverse rotation. The wing members are shaped and weighted such that rotation of the shaft beyond a predetermined angular velocity causes centrifugal force to move the wing members to the retracted position.
REFERENCES:
patent: 2687785 (1954-08-01), Whitney
patent: 2750007 (1956-06-01), Turner et al.
patent: 4410072 (1983-10-01), Dickinson et al.
patent: 4647801 (1987-03-01), Swartwout
Battison Adrian D.
CML Northern Blower Inc.
Dupuis Ryan W.
McClellan James
Sy Mariano
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