Elevator – industrial lift truck – or stationary lift for vehicle – Having specific means contacting or on load support for... – Stationarily mounted and having disparate movable contact...
Patent
1995-12-22
1998-09-15
Terrell, William E.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific means contacting or on load support for...
Stationarily mounted and having disparate movable contact...
187356, 187390, 187279, 187300, 187343, B66B 516
Patent
active
058066330
ABSTRACT:
The elevator safety device creates a false pit beneath the elevator frame using left and right laterally-spaced, fixed stop members fixedly attached to the car frame, and left and right laterally-spaced safety columns affixed to the pit floor and pivotable between an extended position in vertical alignment with the left and right stop members, respectively, and a retracted position clear of the car, the frame, and the left and right stop members. The safety columns are bumper-type devices designed to support full car weight should the need arise, and provides the ASME A17.1 minimum depth of pit for the refuge area. Actuators are operatively connected to the safety columns to pivot them between their extended and retracted positions. A pressure-sensitive detector located on the pit floor below the car detects the presence of a person on the pit floor. The actuators are electronically activated to pivot the safety columns from their retracted to their extended positions. Left and right laterally-spaced, movable stop members are attached to the rails which guide vertical movement of the car, and are movable between a first position in vertical alignment with the car frame and a second position clear of the frame, to prevent downward vertical movement of the car below the stop members. The elevator safety system also includes an electric alarm bell, key-activated switches, and electro-mechanical relays. An ancillary AC power source of 120 volts operates the elevator safety system.
REFERENCES:
patent: 406630 (1889-07-01), Cowie
patent: 642448 (1900-01-01), Holmes
patent: 692888 (1902-02-01), Moses
patent: 787258 (1905-04-01), Austin
patent: 1614675 (1927-01-01), Jones
patent: 2503954 (1950-01-01), Lindahl
Terrell William E.
Tran Khoi H.
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