Material or article handling – Traversing hoist type – Tow truck type
Patent
1989-08-07
1991-02-19
Spar, Robert J.
Material or article handling
Traversing hoist type
Tow truck type
414569, 212261, B66C 2374
Patent
active
049939114
ABSTRACT:
A mobile crane is disclosed, particularly adapted for a towing truck, as including a boom which may be extended or retracted in length and angularly related for lifting and towing purposes by a pair of hydraulic rams, which are specifically oriented for their full extent of movement at an acute angle relative to the plane of the bed of the truck upon which the hydraulic rams are pivotally secured. Extension and retraction of the boom is provided by a hydraulic ram mounted within the boom and arranged when activated to extend the boom outwardly during the pick up of a load and the retraction prior to towing of the load. The boom is pivotally mounted on a mast structure which is braced against a pivot structure secured to the bed of the truck and to which the hydraulic rams are pivotally mounted. In this arrangement, therefore, the horizontal components of forces produced during the lifting and towing of a load and imposed upon the hydraulic rams is offset by the opposing horizontal components of forces imposed upon the braces by the load.
REFERENCES:
patent: 2290384 (1942-07-01), Rowe
patent: 2822931 (1958-02-01), Sparrow
patent: 2911111 (1959-11-01), Grove
patent: 3303940 (1967-02-01), Valla
patent: 3633702 (1972-01-01), Shaw
patent: 3891103 (1975-06-01), Harris et al.
patent: 4394108 (1983-07-01), Cook et al.
patent: 4451193 (1984-05-01), Cannon et al.
patent: 4487396 (1984-12-01), Hoffman
patent: 4674943 (1987-06-01), Nespor
patent: 4790710 (1988-12-01), Ayalon
Grant Wrecker Equipment, Inc.
Spar Robert J.
Vanden Bosch John
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