Portable multi-stage mechanical list

Details Portable multi-stage mechanical list Portable multi-stage mechanical list

1975-04-04

1977-04-05

Blunk, Evon C.

Fire escape, ladder, or scaffold

Platform with elevating or lowering means

Operating means on platform

182112, 187 9E, 187 11, E04G 122, B66B 920

Patent

active

040156869

ABSTRACT:
A portable multi-stage lift has a winch-operated reeving system operable from ground level or from the lift carriage. The stages of the lift mast slidingly interfit front to back and each has the same cross-section shaped to be formed of a single extrusion. Provision is made for automatically locking the lift stages and carriage together if the cable in the reeving system were to fail.

REFERENCES:
patent: 180252 (1876-07-01), McClunie
patent: 2632530 (1953-03-01), Wagner
patent: 2894605 (1959-07-01), Leavit
patent: 3414086 (1968-12-01), Ulinski
patent: 3601342 (1971-08-01), Piasecki
patent: 3606039 (1971-09-01), Weston et al.
patent: 3734240 (1973-05-01), Tang
patent: 3819013 (1974-06-01), Crum

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