Cranes

Details Cranes Cranes

1989-03-22

1991-04-02

Peters, Jr., Joseph F.

Traversing hoists

Having vertically swinging boom

212259, 254399, 254415, B66C 2306, B66D 0308

Patent

active

050041088

ABSTRACT:
The upper block assembly of a crane is connected to the crane boom via a special universal joint having a pivot axis and a hollow shaft. The cable by which the lower block assembly is suspended is fed through the hollow shaft and extends to the crane winch via a pulley mounted on the boom. Guide pulleys are arranged on the upper block assembly and universal joint respectively so that the cable extending therebetween is coincident with the pivot axis of the hollow shaft. With this arrangement, the lower pulley block has unlimited freedom to swing laterally (side lead angle).

REFERENCES:
patent: 1291746 (1919-01-01), Bradney et al.
patent: 1351469 (1920-08-01), Coleman
patent: 1732485 (1929-10-01), Ronk
patent: 2042460 (1936-06-01), Fykse
patent: 2374074 (1945-04-01), Berby et al.
patent: 2720986 (1955-10-01), Burton
patent: 3976322 (1976-08-01), Johnson
patent: 4343458 (1982-08-01), Simon
patent: 4565292 (1986-01-01), Spengel, Sr.

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