Patent ID: 7131501

Claim:
A disk harrow comprising: a frame adapted for motion along a ground surface, said frame comprising an upper cross member supported generally horizontally; a lower cross member supported below the first cross member and extending generally parallel to said first cross member; U-shaped spring members resiliently supporting the lower cross member on the upper cross member, said spring members being spaced apart along said cross members, each U-shaped spring member comprising a curved central portion extending between parallel first and second leg portions; upper mounting elements each connecting the first leg portion of a respective one of the spring members to the upper cross member; lower mounting elements each connecting the second leg portion of a respective one of the spring members to the lower cross member; and a plurality of disk members supported on and spaced along the lower cross member, each disk member being arranged to engage the ground surface; the central portion of each U-shaped spring member having a circular cross section; the first leg portion of each U-shaped spring member having a first generally flat surface facing the second leg portion of said U-shaped spring member and a second generally flat surface opposite said first generally flat surface; the second leg portion of each U-shaped spring member having a first generally flat surface facing the first leg portion of said U-shaped spring member and a second generally flat surface opposite said first generally flat surface; and the U-shaped spring members being arranged such that the central portions of each spring member extend generally vertically and are disposed forward of the upper and lower cross members and the first and second leg portions of said spring member extend generally horizontally rearward from said central portion.