Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-05-13
1983-12-27
Miller, J. D.
Electrical generator or motor structure
Dynamoelectric
Rotary
200 28, 200 80R, H02H 500
Patent
active
044233469
ABSTRACT:
A safety device for preventing overspeed of a rotary shaft driven by an electrical motor is arranged to cut a portion of an electrical circuit feeding the motor with electrical power, by making a cutter received in a rotary member jump up or protrude by a centrifugal force acting on the cutter, so that dangerous overspeed is prevented. The cutter is movably received in a radial bore made in the rotary member, and receives a tensile force from a coil spring which is fixedly supported by the rotary member at one end of the spring. An adjusting screw, which is a cylindrical member, is provided for biasing the cutter against the tensile force from the spring. A critical rotational speed, above which the cutter jumps to break the electrical circuit, can be freely adjusted by changing the position of the adjusting screw. The change in position of the adjusting screw results in both the change of an eccentric distance of the cutter and the change of the tensile force of the spring.
REFERENCES:
patent: 1075987 (1913-10-01), McMahon
patent: 1100748 (1914-06-01), Laycock
patent: 1122332 (1914-12-01), Sullivan
patent: 2562322 (1951-07-01), Lyons
patent: 3154649 (1964-10-01), Schuh et al.
patent: 3632922 (1970-04-01), Baumoel
Hitachi Koki Company Limited
Miller J. D.
Rebsch D. L.
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