Patent ID: 7856930
Filing Date: 2010-12-28
Classification: B66C,B66D

Abstract:
1. A method of reconstructing an aluminum overhead rail for a hoist drive trolley driven along said overhead rail by a motor driven pinion gear, said rail having a pair of bottom flanges defining rail tracks for supporting trolley wheels, said bottom flanges each forming a sideways oriented T slot including the step of fixing an elongated steel gear rack downwardly facing on an underside of one of said bottom flanges to extend along an underside said rail by a series of substantially vertically oriented clamping plates; each abutting one side of said gear rack and connected thereto with a threaded fastener passing through said clamping plate and received in one side of said gear rack, said clamping plate extending over a T slot opening in a side of said rail, with an aligned retainer block in said T slot receiving one or more threaded fasteners through each clamping plate and thereby secured to against a side of said bottom flange; said trolley pinion gear located aligned below said gear rack engaged therewith such as to tend to force said gear rack upwardly and more tightly against said underside of said rail.