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
1989-10-26
1991-09-03
Matecki, Katherine
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254361, 91361, B66D 144
Patent
active
050446088
ABSTRACT:
An operating force controlling device includes a pair of reactive force mechanisms (70, 70') disposed in an opposing relationship to each other in the direction of operation of an operating lever (60). A load pressure of a motor (30) is detected by a detector (91, 91'), and a controlling signal is outputted from a controller (90) in response to the load pressure. A pilot pressure is outputted from an electromagnetic proportional pressure reducing valve (80) in response to the control signal. The pilot pressure is inputted into one of the chambers of the reactive force mechanisms (70, 70') which moves a rod (72, 72') to project, to apply an operation reactive force to the lever (60). The operation reactive force is controlled such that the rate of change thereof may be high when the load pressure of the motor (30) is low but may be low when the load pressure is high. A plurality of control patterns wherein the rate of change of the operation reactive force to the load pressure is different from each other are set to a controller. As an operator manually senses a change of the operation reactive force which is operating the lever (60), a change of the load pressure is sensed and initiation of movement of a suspended cargo is sensed.
REFERENCES:
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patent: 3805674 (1974-04-01), Sebesta
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patent: 4753158 (1988-06-01), Hirata
Fujimoto Yoshiaki
Hidaka Sachio
Kabushiki Kaisha Kobe Seiko Sho
Matecki Katherine
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