Stairway with fail safe power lift for lading, the infirm, wheel

Details Stairway with fail safe power lift for lading, the infirm, wheel Stairway with fail safe power lift for lading, the infirm, wheel

1981-07-13

1984-03-27

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 32, 198323, B66B 906

Patent

active

044388306

ABSTRACT:
A combined stairway and power lift installable as a unit between upper and lower levels and including a fluid-powered lifting platform propelled along the stairs over an underlying pressure sensing mat extending beyond the approaches to the stairs and operable to disable the power to the lift and lock the lift stationary whenever and so long as a weight or pressure remains on the mat. Extendable and retractable barriers crosswise on the transverse edges of the lift must be held positively in a barricading position while the lift is en route between levels. The power system includes devices automatically operable to accelerate and decelerate the lift smoothly and shocklessly between zero and full speed while approaching and departing from a floor level as well as safety equipment for safeguarding against travel of the lift under all unsafe contingencies.

REFERENCES:
patent: 266108 (1882-10-01), Curtis et al.
patent: 502372 (1893-08-01), Moore
patent: 753569 (1904-03-01), Hall
patent: 1838204 (1931-12-01), Wood
patent: 2637432 (1953-05-01), Hohnecker
patent: 4046226 (1977-09-01), Flinchbaugh
patent: 4281744 (1981-08-01), Koerber

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