Industry Patents

Patent: 7874544

Lifting Device

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Patent Number:	7874544
Title:	Lifting Device
Abstract:	A lifting device comprises at least two multi-stage masts and a cable mechanism. Each multi-stage mast comprises a first length and a second length that is longer than the first length. Each multi-stage mast further comprises a plurality of stages, such that at least one stage of a mast is vertically movable with respect to at least one other stage. The cable mechanism comprises a spool and at least one cable that is coupled to the spool and arranged with respect to the multi-stage masts so that when each cable is wound onto the spool, each mast simultaneously and in unison changes length in a direction from the first length to the second length, and when each cable is unwound off the spool, each mast changes length simultaneously and in unison in a direction from the second length to the first length.
Country of Issue:	US
First Named Inventor:	Monroe
Assignee:
Continuation or Divisional of:
International Classification:	B66D 1/26
US Classification:	254/285
Issue Date:	01-25-2011
Filing Date:	03-05-2008
Application :	12/043032
Notes:
Link to Patent at freepatentsonline.com:	7874544 at Freepatentsonline
Link to World Patent Family¹:	World Patent Family at European Patent Office
Link to Google Patents¹:	7874544 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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