Device for enhancing the versatility of cranes or the like

Details Device for enhancing the versatility of cranes or the like Device for enhancing the versatility of cranes or the like

1981-03-26

1983-12-06

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

182 19, 182 63, 182150, 414607, 212251, B66F 906, B66F 1104

Patent

active

044187912

ABSTRACT:
The free end portion of the boom of a crane carries a separable pivot bearing defining a horizontal pivot axis for a second bearing which reciprocably guides an upright column for one or more galleries. When the cable which is used to lift or hold the column breaks and the column begins to rapidly descend, such movement of the column activates a composite brake mounted on a frame surrounding the column at a level above the second bearing. The brake holds the column against downward movement with reference to the frame whereby the frame tends to descend toward the second bearing against the opposition of several shock absorbers which reduce the likelihood of damage to and/or excessive swaying of the boom and/or injury to the occupant or occupants of the gallery. The speed of downward movement of the column is monitored by a detector which activates the brake as soon as the speed exceeds a preselected value.

REFERENCES:
patent: 1337487 (1920-04-01), Schlatter
patent: 2632530 (1953-03-01), Wagner
patent: 2821312 (1958-01-01), Wiegel
patent: 3039233 (1962-06-01), Holmes
patent: 3504461 (1970-04-01), Copeland
patent: 3608669 (1971-09-01), Lindsay
patent: 3647099 (1972-03-01), Carriere
patent: 3907142 (1975-09-01), Welch
patent: 3966070 (1976-06-01), Barth
patent: 4074790 (1978-02-01), Colbachini
patent: 4154318 (1979-05-01), Malleone

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