Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1987-08-28
1988-12-06
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
200298, 318305, B66D 112, H02P 506
Patent
active
047891351
ABSTRACT:
An operating device for an electric hoist having a DC motor for raising and lowering an object, comprises a low speed adjusting setting unit (VR1) and a high speed adjusting setting unit (VR2) provided in a control box of the hoist. The operating device further comprises in the control box a two-step push-button switch (PB-U) for the raising operation for switching over the low speed adjusting setting unit and the high speed adjusting setting unit to connect either of the units (VR1 and VR.sub.2) to a speed-change control circuit by pushing the two-step push-button switch (PB-U) to either of first and second step positions, and a two-step push-button switch (PB-D) for the lowering operation for switching over the low speed adjusting setting unit (VR1) and the high speed adjusting setting unit (VR2) to connect either of the units to the speed-change control circuit by pushing the two-step push-button switch (PB-D) for the lowering operation to either of first and second step positions.
REFERENCES:
patent: 3189196 (1965-06-01), Carl et al.
patent: 3493832 (1970-02-01), Kay
patent: 3784165 (1974-01-01), Pruitt
patent: 4520247 (1985-05-01), Pancook et al.
patent: 4636962 (1987-01-01), Broyden et al.
Hail III Joseph J.
Kabushiki Kaisha Kito
Levy Stuart S.
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