Traversing hoists – Overhead – Cable
Patent
1978-07-10
1980-02-12
Kunin, Stephen G.
Traversing hoists
Overhead
Cable
212 66, B66C 2306
Patent
active
041879490
ABSTRACT:
A derrick crane is provided in the hollow interior of its post with a mechanism for preventing mutual rubbing of derricking and hoisting wire cables for the boom, which mechanism comprises a plurality of vertically spaced-apart intermediate turntables having spaced-apart sheaves for guiding and maintaining apart the derricking and hoisting cables and a cable device for so intercoupling a swivel pulley at the top of the post and the turntables that each of the differences between the rotational angles of the swivel pulley and the nearest turntable and between adjacent turntables does not exceed a specific angle (e.g., 120 degrees). The goose neck end of the boom is pivotally mounted on a turning ring rotatably supported around the post. The turning ring is driven in rotation by at least one slewing drum having a diameter smaller than that of the turning ring and coupled to the ring by means of wire cables wound around the ring and drum.
REFERENCES:
patent: 453087 (1891-05-01), Milliken
patent: 957239 (1910-05-01), McVeigh
patent: 1402291 (1922-01-01), Harbinger
patent: 1417728 (1922-05-01), Gill
patent: 3446362 (1969-05-01), Banks, Jr.
patent: 3684104 (1972-08-01), Oda
Kawasaki Jukogyo Kabushiki Kaisha
Kunin Stephen G.
Siemens Terrance L.
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