Elevator with reduced counterweight

Details Elevator with reduced counterweight Elevator with reduced counterweight

1997-09-17

1999-11-16

Noland, Kenneth W.

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific counterbalance means for load support

187281, B66B 706

Patent

active

059840528

ABSTRACT:
An elevator system includes a control system that determines the amount of load of the car, and that determines the operating speed profile of the car based upon the amount of load in the car. In a particular embodiment, the control system includes a load weighing device and uses the weight of the car to determine the selection between two operating speed profiles: a normal operating speed profile and a reduced operating speed profile. The control system compares the measured live load to a pre-selected threshold, such as the car weight plus twice the percentage balancing multiplied by the rated full load of the elevator system. If this threshold is exceeded, then the reduced operating speed profile is selected. In this way, reduced balancing may be used. The selected percentage balancing may be determined empirically or estimated by taking into account the building size, usage and other operational characteristics.

REFERENCES:
patent: 5780786 (1998-07-01), Miyanishi

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