Mechanical safety unit on spindle-driven lifts

Details Mechanical safety unit on spindle-driven lifts Mechanical safety unit on spindle-driven lifts

1976-07-30

1978-07-25

Blunk, Evon C.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 24, B66F 728

Patent

active

041024354

ABSTRACT:
A safety unit for latching against upward movement a spindle driven lift of the type having a lifting nut on which a lifting carriage guided in a column is supported and a safety nut mounted for movement on the spindle for guiding the column in the event of lifting nut failure with a pawl rotatably mounted adjacent the tooth spindle for rotating, urged by a spring, to a locking position preventing rotation of the spindle in one direction when a guide bolt extending through one of a pair of contiguous bores in the pawl having different diameters is shifted axially in response to lifting nut failure, the bolt having different diameter portions along its axis so that the shifting permits rotation of the pawl into its locking position.

REFERENCES:
patent: 1898492 (1933-02-01), Morse
patent: 2001810 (1935-05-01), Zwald
patent: 2750004 (1956-06-01), Harrison
patent: 2873848 (1959-02-01), Steinmetz
patent: 3141353 (1964-07-01), Gray
patent: 3309060 (1967-03-01), Villars
patent: 3687234 (1972-08-01), Gendreau
patent: 3704757 (1972-12-01), Buress
patent: 3958664 (1976-05-01), Perkins

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