04425973 is referenced by 30 patents and cites 7 patents.

A double disc, debris-clearing assembly has a suspension member for releasable attachment to a farm implement and on which is rigidly secured an upright standard. A guide rigid to and depending from the suspension member beneath the standard has a tiltable channel element releasably mounted thereon and provided with an upwardly-extending strap for varying its height along the guide. An adjustable connection is utilized between the strap and the standard. A pair of interconnected brackets carried by the channel element are provided with disc mounts which may, in turn, be adjusted to vary the positions of the discs relative to each other and to their brackets. Accordingly, the suspension member, the standard, the guide, the strap and the channel element are common to the bracket unit and, therefore, the discs.

Title
Trash clearing disc assembly for planters
Application Number
6/324434
Publication Number
4425973
Application Date
November 24, 1981
Publication Date
January 17, 1984
Inventor
Forrest E Robertson
Garden City
KS, US
Donald E Williams
Garden City
KS, US
Agent
Schmidt Johnson Hovey & Williams
Assignee
Acra Plant
KS, US
IPC
A01C 5/06
View Original Source