Heavy duty crane

Details Heavy duty crane Heavy duty crane

1977-11-01

1980-04-08

Makay, Albert J.

Traversing hoists

Overhead

Cable

212145, B66C 2372

Patent

active

041968166

ABSTRACT:
A crane is operable in either a regular mode or a heavy duty mode. In the regular mode, an upper works is rotatble, through a turntable bearing, on a lower works. A boom is pivotally connected to one end of the upper works and a counterweight is connected to the opposite end thereof. In the heavy duty mode, a support ring surrounds the lower works and is connected thereto. An auxiliary frame is mounted on the support ring, surrounding the upper works, for rotation on the ring in unison with rotation of the upper works. The boom used in the regular mode is pivotally connected to the auxiliary frame for use as a gantry, and a heavier boom is pivotally connected to the auxiliary frame adjacent the gantry. The counterweight of the machine in the regular mode is shifted to the auxiliary frame opposite the boom and gantry, and an auxiliary counterweight is added to the auxiliary frame.

REFERENCES:
patent: 3485383 (1969-12-01), Beduhn
patent: 3878944 (1975-04-01), Beduhn et al.
patent: 3955684 (1976-05-01), Novotny
patent: 4042115 (1977-08-01), Beduhn et al.

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