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:
Aug. 30, 1977
Filed:
May. 25, 1976
Donald C McDonald, Sherborn, MA (US);
Roger B Ela, Spencer, MA (US);
Francis E Whittaker, Holliston, MA (US);
Walker Magnetics Group, Inc., Worcester, MA (US);
Abstract
Apparatus for the magnetically lifting and tilting an elongate load, e.g., a steel beam, is disclosed. The apparatus comprises a plurality of electromagnets supported in a corresponding plurality of yokes in a linear array along a beam structure. On each yoke, a stepping motor is coupled to the respective electromagnet for controllably rotating the electromagnet around a pivotal axis which is parallel to the axis of the array. The motors are synchronously operated, thereby enabling an elongate load to be lifted by the electromagnets together and tilted around the pivotal axis. In a preferred construction, each end of each yoke is suspended on a plurality of tie elements connected to a vertically compliant spring suspension system mounted on the beam structure. The tie elements are arranged to minimize swinging or misalignment of the several electromagnetic lifting elements.