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Class Information
Number: 172/90
Name: Earth working > With drive means for tool or cleaner > Irregular or off-center ground-engaging wheel or support
Description: Apparatus in which an earth working element which is supported on a frame is moved towards and away from the earth by a lifting member which is rotatably or pivotally supported on an axis on said frame and has circumferential portions which extend radially to varying distances from said axis in such fashion that said lifting member engages the earth and periodically lifts the frame and the earth working element.

Patents under this class:

Patent Number Title Of Patent Date Issued
6151811 Retractable assembly for trenchers and walk-behind power units Nov. 28, 2000
5673757 Ground opening device Oct. 7, 1997
4227579 Dike producing device Oct. 14, 1980
4213502 Self tripping dammer Jul. 22, 1980
4155315 Mobile spreader May. 22, 1979
4002206 Ditcher Jan. 11, 1977

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