Double-masted crane with improved brake arrangement

Details Double-masted crane with improved brake arrangement Double-masted crane with improved brake arrangement

1994-07-01

1996-05-07

Terrell, William E.

Elevator, industrial lift truck, or stationary lift for vehicle

Transportable elevator

Wheel supported

187252, 187262, 187373, 187393, B66B 916

Patent

active

055137237

ABSTRACT:
Lifting apparatus comprising first and second generally vertical masts, an assembly including a frame moveable along the masts, and a load engaging mechanism mounted on the frame, a first brake mechanism which, upon actuation, engages the first mast to prevent downward movement of the frame relative to the first mast, a second brake mechanism which, upon actuation, engages the second mast to prevent downward movement of the frame relative to the second mast, an overspeed mechanism for sensing the downward velocity of the assembly and for actuating the first brake mechanism when the overspeed mechanism senses that the downward velocity of the assembly exceeds a predetermined value, a first electrical device for providing an electrical signal when the first brake mechanism is actuated, and a second electrical device for actuating the second brake mechanism in response to the electrical signal.

REFERENCES:
patent: 1062611 (1913-05-01), Schnur
patent: 2150373 (1939-03-01), Hymans
patent: 3695396 (1972-10-01), Jones
patent: 4372426 (1983-02-01), Gamundi
patent: 4662481 (1987-05-01), Morris et al.
patent: 5052523 (1991-10-01), Ericson
patent: 5301773 (1994-04-01), Jamieson et al.

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