Rotary harrows

A rotary harrow having a transverse frame and a plurality of rotatable soil working members, said soil working members being supported on shafts journalled in said transverse frame and rotatable about upwardly extending axes defined by said shafts, said soil working members comprising downwardly extending tines and drive means being connected to rotate said members, a roller connected to said frame and being rotatable about a substantially horizontal axis extending transverse to the direction of travel of the harrow, said roller having a periphery comprised by helical ground-engaging rods and being located at the rear of said frame, coupling means on the front side of said frame and said coupling means comprising connecting points for a multi-point linkage of a prime mover, arms pivotally interconnecting the roller to said frame and adjusting means associating at least one of said arms with said frame to adjust the position of said roller with respect to said frame, said coupling means and said roller affording the main support for the harrow during operation, an elongated tool bar being fixed to said frame by arm means and said tool bar being interconnected to said coupling means by at least on strut bar, said tool bar extending horizontally and across the working width of said harrow at the rear of said members and above said roller, said arm means extending upwardly and rearwardly from the frame with respect to the direction of travel.