Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1984-08-07
1987-01-13
Staab, Lawrence
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
744115, 74412TA, 254274, 254378, 187 849, 187 24, F16H 5710
Patent
active
046354913
ABSTRACT:
A motor-driven cylinder for lifting apparatus has screw means including intermeshed internally and externally threaded screw means by which a load can be moved upwardly and downwardly by the torque of a motor, the motor-driven cylinder including torque transmission means movable in a first direction and a second direction opposite thereto for transmitting the torque of the motor to the screw means. During operation, the torque transmission means is moved in the first direction by the applied torque of the motor causing compression of a spring. When no torque is produced from the motor due to its malfunctioning or due to a lack of electrical power applied to the motor the torque transmission means is moved in the second direction under the restoring force of the compressed spring into a mechanically braked condition. Thus, a compact, integral, low-cost safety device is provided for preventing the lifting apparatus from falling, accidentally, under the force of gravity.
REFERENCES:
patent: 263773 (1882-09-01), Edson et al.
patent: 1522967 (1925-01-01), Meyer et al.
patent: 2564267 (1951-08-01), Manke
patent: 3291260 (1966-12-01), Woor et al.
patent: 3403570 (1968-10-01), Larson et al.
patent: 3435915 (1969-04-01), Villars
patent: 3449978 (1969-06-01), Stimpson
patent: 3543598 (1970-12-01), Lanzenberger
patent: 3559499 (1971-02-01), Profet
patent: 4022428 (1977-05-01), Mantha
patent: 4158797 (1979-06-01), Alcott
patent: 4295384 (1981-10-01), Brandt et al.
patent: 4493479 (1985-01-01), Clark
patent: 4518153 (1985-05-01), West et al.
Tamamura Tetsuo
Yamano Kenji
Birchard Bruce L.
Fuji Electric & Co., Ltd.
Staab Lawrence
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