Rotary crane

Details Rotary crane Rotary crane

1974-07-15

1976-05-18

Makay, Albert J.

Traversing hoists

Overhead

Cable

74 63, 192 84T, 212 59R, B66C 2384

Patent

active

039571610

ABSTRACT:
An improved drive for rotating the boom-carrying portion of a rotary crane on the base portion of the crane about an upright axis employs an electric motor rotating continuously in one direction when energized and operatively connected to a drive element rotatable on one of the crane portions. The drive element engages the other crane portion and thereby rotates the boom-carrying portion. The motion transmitting train which connects the motor to the drive element includes an electromagnetic coupling whose slip may be controlled to vary the torque transmitted from the motor to the drive element.

REFERENCES:
patent: 272988 (1883-02-01), Thompson
patent: 1855892 (1932-04-01), Schiebeler
patent: 2405642 (1946-08-01), Corte
patent: 2596654 (1952-05-01), Clark et al.
patent: 2599677 (1952-06-01), Waguespack
patent: 3029955 (1962-04-01), Perkins
patent: 3144921 (1964-08-01), Martinek
patent: 3439787 (1969-04-01), Minciotti et al.
patent: 3463020 (1969-08-01), Gelb

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