Traversing hoists – Overhead – Cable
Patent
1978-02-14
1979-10-09
Makay, Albert J.
Traversing hoists
Overhead
Cable
212144, 212 49, 212 46R, B66C 2372
Patent
active
041703090
ABSTRACT:
A vertical tower and pivoted upper boom are counterbalanced by a mobile counterweight member mounted on a self-propelled earthborn unit spaced a substantial distance from the tower in diametric opposition to the boom. The tower, which is pivotable about a vertical pivot axis, is connected to the counterweight by a first horizontal rigid spreader link and by a second diagonal rigid spreader link. The two links are respectively connected to the lower and upper ends of the tower. In this manner, rotational torque is transmitted directly to both the lower and upper ends of the tower. Both the tower and the boom can therefore be turned about the vertical pivot axis by operation of the self-propelled counterweight unit without the usual problems of having the tower "winding up" due to the rotational forces applied to it during turning of large loads.
REFERENCES:
patent: 3777900 (1973-12-01), Brewer
patent: 3794184 (1974-02-01), Higgins
patent: 3836010 (1974-09-01), Lampson
patent: 3842984 (1974-10-01), Brown
patent: 3868022 (1975-02-01), Greenlay et al.
patent: 3921815 (1975-11-01), Brown et al.
patent: 3930583 (1976-01-01), Jouffray
patent: 3955684 (1976-05-01), Novotny
patent: 4103783 (1978-08-01), Beduhn et al.
American Hoist and Derrick Co., Sky Horse, 900 Series.
Johnson R. B.
Makay Albert J.
Riggers Manufacturing Company
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