Crane implement for hoisting and launching boats to and from a q

Details Crane implement for hoisting and launching boats to and from a q Crane implement for hoisting and launching boats to and from a q

1989-09-19

1990-11-27

Cherry, Johnny D.

Handling: hand and hoist-line implements

Spacing hoist bar or frame

Adjustable to accommodate different size loads

114 44, 294 813, 294 8154, 405 3, B66C 142

Patent

active

049730940

ABSTRACT:
Hoisting of boats is made faster and performable by a single operator by utilizing an hoisting apparatus which can be used with any lifting crane available and which comprises a balance having at least a longitudinal beam and two tubular crossbeams, out of the extremities of which extend, respectively, horizontal arms telescopically extensible and retractable driven by remotely controlled hydraulic cylinders. A vertical leg is rigidly fixed at the free extremity of each horizontally extensible arm and the leg is provided with a cantilevered foot carrying a support plate keel of the boat to be hoisted. The hanging of the balance on the crane's hook is implemented by means of a suspension carriage running along the central longitudinal beam of the balance, the longitudinal position of which may be remotely controlled by the operator by means of a hydraulic cylinder. A mechanism for rotating the suspended load in respect to the crane is also disclosed.

REFERENCES:
patent: 3045839 (1962-07-01), Hibberd
patent: 3409153 (1968-11-01), Stearn et al.
patent: 3596968 (1971-08-01), Holm
patent: 3945673 (1976-03-01), Visser
patent: 4245941 (1981-01-01), Charonnat
patent: 4266904 (1981-05-01), Fadness
patent: 4553719 (1985-11-01), Ott
patent: 4686920 (1987-08-01), Thomas

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