Patent US2121906 - CLOSURE OPERATING MECHANISM

Patents

Inventors: E. L. DUNN, E. L. DUNN
Current U.S. Classification: 74/89.21; 49/363; 187/324

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Citing Patent	Filing date	Issue date	Original Assignee	Title
US5105672	28 Feb 1991	21 Apr 1992		Rotary drive apparatus having one member with smooth outer peripheral surface
US5797471	19 Jul 1996	25 Aug 1998	Montgomery Kone Inc.	Linear door drive operator
US6000503	23 Dec 1997	14 Dec 1999	Otis Elevator Company	Sliding two speed door mechanism for an elevator car
US7975807	24 Dec 2007	12 Jul 2011		Elevator climbing system