Rotary harrows

A soil-cultivating implement or rotary harrow comprising a frame and a plurality of soil-working members being mounted on said frame in a row that extends transverse to the direction of travel, said members being rotatable on corresponding upwardly extending shafts and driving means connected to rotate said shafts and soil-working members, each soil-working member being connected to said frame by a pivotal mounting that comprises a first bearing and a second bearing, said bearings being spaced apart and movable with respect to one another, and said second bearing being movable with respect to said frame, said first bearing rotatably supporting a respective transmission shaft of said member that extends substantially parallel to the direction of travel and said transmission shaft being connected to the upwardly extending shaft of said soil-working member, said first bearing being pivotable relative to the second bearing about an axis which coincides with the longitudinal axis of said transmission shaft.

A rotary harrow comprising a frame having an elongated frame portion, said portion extending transverse to the normal direction of travel of said harrow, a plurality of soil-working members being mounted side by side and being rotatable about upwardly extending axes defined by corresponding shafts supported on said portion, driving means connected to rotate said shafts and the shafts of adjacent soil-working members being rotated in relative opposite directions, each member comprising a support having downwardly extending tines, the tines of said members being rotatable about said shafts to work adjoining circular paths and the diameter of the circle defining each path substantially equalling or exceeding the distance between the axes of rotation of two adjacent soil-working members, at least some of said soil-working members being pivotable about respective pivot axes and each pivotable member being independently swingable upwardly as a unit with respect to an adjacent member responsive to contact with obstacles in and on the ground, spring means biasing said pivotable member to an operative central position.

A rotary harrow comprising a frame having an elongated frame portion, said portion extending transverse to the normal direction of travel of said harrow, a plurality of soil-working members being mounted side by side and being rotatable about upwardly extending axes defined by corresponding shafts supported on said portion, driving means connected to rotate said shafts and the shafts of adjacent soil-working member comprising support means having downwardly extending tines, the tines of said members being rotatable about said shafts to work adjoining circular paths, the diameter of the circle defining each path substantially equalling or exceeding the distance between the axes of rotation of two adjacent soil-working members, at least some of said soil-working members being independently pivotably about two respective pivot axes, said pivot axes being spaced apart and each pivotal soil-working member being displaceable as a unit about either of said two axes with respect to an adjacent member, responsive to contact with obstacles in and on the ground.

A rotary harrow comprising a frame having an elongated frame portion, said portion extending transverse to the normal direction of travel of said harrow, a plurality of soil-working members being mounted side by side and being rotatable about upwardly extending axes defined by corresponding shafts supported on said portion, driving means connected to rotate said shafts and the shafts of adjacent soil-working members being rotated in relative opposite directions, each soil-working member comprising support means having downwardly extending tines, the tines of said members being rotatable about said shafts to work adjoining circular paths, the diameter of the circle defining each path substantially equalling or exceeding the distance between the axes of rotation of two adjacent soil-working members, said driving means comprising a drive shaft that engages said upwardly extending shafts and at least some of the soil-working members being independently pivotable about said drive shaft and displaceable upwardly as a unit relative to adjacent soil-working members, responsive to contact with an obstacle in and on the ground.