Resources Contact Us Home
Browse by Category: Main > Construction
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

  Recently Added Patents
Subpixel-based image down-sampling
Parallel active optical cable
Interaction analysis and prioritization of mobile content
Systems and methods for providing a shared folder via television
Systems, methods and apparatus for payment processing
Image manipulating system and method
Vehicle control system
  Randomly Featured Patents
Apparatus and method
Clocking mechanism for multiple overlapped dynamic programmable logic arrays used in a digital control unit
Shoe outsole
Table saw with reset mechanism
Method of making liquid crystal devices with improved adherence
Agents and use thereof
Apparatus for rinsing and chemically sanitizing food ware items
Plasma process apparatus
Lock mechanism
Support arm