Industry Patents

Patent: 8328165

Hoist With Overspeed Protection

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Patent Number:	8328165
Title:	Hoist With Overspeed Protection
Abstract:	A hoist system with an overspeed detection sub-system for detecting overspeed by comparing an actual drum assembly speed with a target value. For example, the rotation of a motor may be determined by a first rotary encoder and the rotation of a drum may be determined by a second rotary encoder. The output of the first rotary encoder (the basis of a target value) is compared with the output of the second rotary encoder (corresponding to actual motion of the drum). If the difference between the target value and the actual motion is too large, then a problem, such as a broken hoist hardware component may exist, and appropriate remedial action is taken, such as braking the motor and/or the drum.
Country of Issue:	US
First Named Inventor:	Eschelbacher, Svitavsky
Assignee:	J.R. Clancy
Continuation or Divisional of:
International Classification:	B66D 1/48
US Classification:	254/267
Issue Date:	12-11-2012
Filing Date:	09-04-2009
Application :	12/554186
Notes:
Link to Patent at freepatentsonline.com:	8328165 at Freepatentsonline
Link to World Patent Family¹:	World Patent Family at European Patent Office
Link to Google Patents¹:	8328165 at Google Patents

1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.

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