Progressive safety

Details Progressive safety Progressive safety

1983-06-13

1985-09-03

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 83, 188 41, B66B 518

Patent

active

045387060

ABSTRACT:
A safety device for stopping an elevator car or counterweight has a brake shoe on one side of a guide rail, and, on the other side, two leaf springs and a roller. The springs define a tapered area, and the roller is pulled by a governor to engage the rail, which trips the roller, causing it to be forced into the tapered area and forcing the brake shoe against the rail. The roller engages a soft metal stop when the device is operated and this stop is worn away during each operation, which permits the roller to move higher on each operation; this compensates for any wear on the brake shoe. The governor is attached to the car or counterweight.

REFERENCES:
patent: 1581458 (1926-04-01), Lindquist
patent: 1873829 (1932-08-01), Dunlop
patent: 4083432 (1978-04-01), Lusti
patent: 4469198 (1984-09-01), Crump

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