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:
Dec. 29, 1981
Filed:
Oct. 14, 1980
Applicant:
Inventor:
Johannes Sandvik, Stokke, NO;
Assignee:
Elkem A/S, Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66D / ; F16D / ;
U.S. Cl.
CPC ...
254368 ; 192 / ;
Abstract
The drum of a hoisting apparatus is axially shifted to frictionally engage a driving plate. The drum is shifted by rotating an adjacent, first disc about the drum axis relative to a coaxial stationary disc. Each of the discs has three holes of a particular configuration to define three cooperative pairs of holes. Each cooperative pair of holes receives a dowel of predetermined length so that rotation of the first disc causes the dowel to react against the discs and shift the first disc and drum away from the stationary disc and into frictional driving engagement with the driving plate.