The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1979
Filed:
Oct. 19, 1977
Robert A Fritsch, Cedar Rapids, IA (US);
Harnischfeger Corporation, W. Milwaukee, WI (US);
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.