Elevator safety brake

Details Elevator safety brake Elevator safety brake

1974-09-06

1976-03-09

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 69, 187 89, 188189, B66B 522

Patent

active

039426076

ABSTRACT:
The accompanying specification discloses a mine cage safety device comprising at least one friction wheel adapted to roll freely over the shaft wall or mine cage guide timber when the cage is lifted upwards and downwards in the mine shaft. When the cage accelerates past a critical level as in a free fall the friction wheel actuates a hydraulic trigger means that in turn sets off an explosive charge which instantaneously drives braking means against the timber guides to thereby arrest the free fall of the mine cage.

REFERENCES:
patent: 613628 (1898-11-01), Hadfield
patent: 805818 (1905-11-01), Regina
patent: 950477 (1910-03-01), Courtois
patent: 1550261 (1925-08-01), Jordan
patent: 3601227 (1971-08-01), Burch
patent: 3872949 (1975-03-01), Snyder

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