B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 1/28 (2006.01) B66B 1/04 (2006.01)
Patent
CA 2088893
With this method and this device for the saving of electrical energy for the drive of an hydraulic lift, it is possible to drive the lift cage in the upward direction with practically constant power for any loading. The maximum nominal speed in upward direction is chosen for a loading which according to experience occurs most frequently. The required size of the drive is designed in accordance with this choice. The hoist speed is reduced correspondingly for higher loads and increased correspondingly for lower loads. The variable hoist speed is achieved either through an adjustable pump (8) of variable displacement volume and controlled by a pressure-regulating valve (14) or through a positive-displacement pump (28) of constant displacement volume, which pump is driven by a frequency-regulated electrical motor (31) with stepless adaptation of the rotational speed of the electrical motor (31) in dependence on the effectively present loading.
Ag Inventio
Riches Mckenzie & Herbert Llp
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