Land vehicles – Wheeled – Running gear
Patent
1977-10-19
1979-07-10
Sheridan, Robert G.
Land vehicles
Wheeled
Running gear
B62D 2100
Patent
active
041605586
ABSTRACT:
The principal load-bearing section of the carrier frame for a mobile crane has a rotatable crane upper mounted near its center and has extendable and retractable outriggers mounted near its opposite ends. The load-bearing section comprises longitudinally extending steel plates which are welded together to provide a pair of longitudinally extending interconnected horizontally spaced apart hollow beams. The beams, which have a common top plate, each have a bottom plate, a vertical outer side plate and a sloped inner side plate, which side plates are connected between the top and bottom plates and subjected to shear under load. The top plate is in compression and the bottom plate is in tension. The inner plates are slanted so as to provide more effective area for the top compression plate so as to provide a thinner, and therefore lighter, plate. The top edge of each sloped inner side plate is attached to the underside of the common top plate at a location which is spaced in optimum distance from the longitudinal centerline of the frame. The plates are sized, shaped, and located so as to provide a load-bearing section having maximum strength and minimum weight, taking into consideration plate thicknesses and overall frame size. The load-bearing section of the frame is strong, compact, light-weight, buckle-resistant under loads, and well-suited for mounting components thereon.
REFERENCES:
patent: 2653829 (1953-09-01), Sheehan
patent: 3622171 (1971-11-01), Gottschalk
patent: 4059170 (1977-11-01), Young
Harnischfeger Corporation
Nilles James E.
Sheridan Robert G.
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