Patent ID: 8267187
Filing Date: 2012-09-18
Classification: A01B

Abstract:
1. An adjustable angle tooth harrow comprising: a harrow drawbar structure towable in a forward direction over ground and movable between a raised transport position and a lowered field-working position, a fore-and-aft extending rigid support strap; an apertured bracket pivotally connected to the support strap for rotation about an axis transverse to the forward direction and having a plurality of apertures offset from the axis, wherein the axis is fixed relative to the support strap; a tooth bar connected to the apertured bracket for rotation therewith and supported from the bracket for forward movement over the ground, the forward movement over the ground when the drawbar is in the field-working position biasing the tooth bar and the bracket in a first rotational direction about the axis; linkage structure connected to the drawbar structure and to the apertured bracket at a fixed location on the bracket offset from the axis, the linkage suspending the tooth bar from the drawbar structure, wherein the linkage structure biases the apertured bracket a first rotational direction about the axis when the drawbar structure is in the raised transport position; and adjusting pin structure insertable into a selected one of the apertures, the pin contacting the support strap to limit rotation of the tooth bar to a tooth working position dependent on the selected aperture, and wherein the linkage structure supports the tooth bar from the harrow drawbar and thereby biases the adjusting pin structure about the axis to a non-contact position relative to the support strap when the drawbar is in the raised transport position.