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:
Jan. 23, 1979
Filed:
Mar. 20, 1978
Rudy M Harris, Hallsville, TX (US);
Roger L Wolfe, Longview, TX (US);
William T Martin, Longview, TX (US);
Marathon LeTourneau Company, Longview, TX (US);
Abstract
A movable hoisting apparatus having a pair of spaced apart legs with each leg having two substantially vertical columns, beams extending between the forward columns and the rear columns of each leg, a trolley movable along each of the beams, a lifting frame, sheaves mounted on the lifting frame and trolley sheaves mounted on the trolley, a power drum, a cable extending from the power drum in opposite directions, over the trolley sheaves, downward and around the lifting frame sheaves, upward over the trolley sheaves and forming a crossover portion of the cable between the trolley sheaves and variable brake means retarding the movement of the crossover cable portion to reduce swaying motion of the lifting frame and its load without interfering with the raising and lowering of the lifting frame and load.