Patent ID: 6164386
Filing Date: 2000-12-26
Classification: A01B

Abstract:
A harrow comprising:an elongate tool bar;a plurality of wheels supporting the tool bar on the ground for movement in a working direction perpendicular to the tool bar; anda plurality of harrow elements mounted on the tool bar to extend generally rearward therefrom for movement therewith in the working direction;each harrow element comprising;a pair of support arms pivotally mounted spaced apart on the tool bar, the support arms extending generally rearward therefrom;a frame pivotally mounted on a rear end of the support arms towards a rearward end of the frame such that the frame is pivotal about an axis extending through the rear ends of the support arms;a hanger connected between a front end of the frame and the support arms for suspending the front end of the frame from the support arms;a plurality of tine support bars mounted on the frame transversely to the working direction, the tine support bars being spaced apart across the frame, each tine support bar having a plurality of tines mounted thereon, the tines being spaced apart along the tine support bars, each tine being mounted at an upper end on the tine support bar to extend generally downward to a ground engaging end, each tine support bar being supported for pivotal movement relative to the frame about a respective tine axis extending longitudinally of the tine support bar;a tine adjustment mechanism connected between the tine support bars such that displacement of the tine adjustment mechanism relative to the frame pivots the tine support bars in unison about the respective tine axes for adjusting an angle of the tines relative to the ground as the tine adjustment mechanism is displaced relative to the frame; anda coupling supporting the frame on the hanger, the coupling being pivotally mounted relative to the frame about a coupling aXis extending through the coupling;the tine adjustment mechanism being connected to the coupling such that the coupling is arranged to be pivoted about the coupling axis as the tine adjustment mechanism is displaced relative to the frame to adjust a height of the front end of the frame relative to the support arms in response to adjusting the angle of the tines.