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. 25, 1992
Filed:
Nov. 05, 1990
Applicant:
Inventor:
Stephen J McCormick, Shorewood, WI (US);
Assignee:
Harnischfeger Corporation, Brookfield, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
188 821 ; 188187 ; 188 823 ; 188 711 ; 188 727 ; 188 727 ; 192-7 ; 192 / ; 254344 ; 254347 ; 254903 ;
Abstract
The invention involves a hoist for raising and lower loads. The hoist includes a drive motor, gearing, a load brake and a cable-winding drum. The drum has an end with a splined annular member slidably engaging a similar splined annular member of a drum-concentric friction plate. The friction plate directly drives the drum during load raising and directly brakes the drum during load lowering. Because of the direct mechanical coupling between the drum and the friction plate, a failure in the gearing does not impair the ability of the friction plate to brake the load. Further details of the invention are set forth in the specification.