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Class Information
Number: 172/619
Name: Earth working > Plural relatively movable tools > Plural tool groups relatively vertically movable because of operation
Description: Apparatus comprising a plurality of groups of earth working elements interconnected by means which permits one group to rise and fall or pivot vertically as a unit with respect to another group under the influence of the forces applied thereto during operation, without intervention of an attendant.

Sub-classes under this class:

Class Number Class Name Patents
172/632 Group movable about oblique horizontal axis 2
172/633 Group pivotal about intermediate transverse axis 7
172/623 Groups abreast and in tandem 0
172/631 Groups movable about common longitudinal axis 2
172/630 Groups pivoted to opposite sides of longitudinal draft member 5
172/620 Parallel transverse tooth bars 7
172/624 Plural groups movably connected to forward transverse draft bar 13
172/628 Similar groups arranged to form a triangular shape 0
172/629 Three or more laterally spaced groups 8

Patents under this class:

Patent Number Title Of Patent Date Issued
6681867 Oscillating ground engaging tool Jan. 27, 2004
5497837 Apparatus for controlling down pressure on agricultural implements Mar. 12, 1996
4977964 Resilient planar framework for supporting multiple groundworking tools Dec. 18, 1990
4426940 Implements for injecting substances below the surface of the soil Jan. 24, 1984
4328869 Implement with wing lift including toggle links and roller May. 11, 1982
4291638 Agricultural implements Sep. 29, 1981
4114695 Rotary harrow with pivotable coupling assembly Sep. 19, 1978
4049061 Rotary harrows Sep. 20, 1977
4044842 Flexible multi-section implement Aug. 30, 1977

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