Abstract: A harrow has a frame, tines pivotal on the frame and each a lower arm with a soil surface under the harrow. An actuator on the frame can shift a bar frame shiftable horizontally on the frame. Respective spring biasing units above the axes each have a guide element connected to the bar frame and displaceable therewith through a predetermined displacement path, a connecting element connected to respective upper arms of the tines, a first compression spring bearing on both of the elements and biasing the other element away from the one element so as to press the lower arm downward into the soil surface during movement of the respective guide element through the path, and a second compression spring bearing continuously on one of the elements and engageable with the other of the elements after displacement of the respective spring-biasing unit only through a part of the path.

Abstract: A disc harrow composed of one or more disc gangs has a subframe coupled to the disc gangs to move the disc gangs in response to variations in farmland terrain to limit the impact of ground variation when encountered during the harrowing process. When the obstruction is cleared, the subframe automatically returns the disc gangs to their pre-obstruction position. In addition to reducing the potentially-damaging impact of obstructions, the subframe also maintains a more consistent reel depth during undulations or changes in the farmland terrain, such as during harrowing of slopes or unleveled fields such as valleys, near waterways, and along fence rows.

Abstract: A harrow is provided having an elongate tool bar mounted on wheels for movement in a forward direction perpendicular to the tool bar. A plurality of harrow elements are mounted on the tool bar to extend generally rearward therefrom. A pair of support arms are pivotally mounted on the tool bar at a first end and mount each harrow element on a second end towards a rearward end of the harrow element. A hanger is connected between the support arms and the harrow element towards a forward end of the harrow element for suspending the harrow element therefrom. A plurality of tines are mounted on the harrow element such that the angle of the tines relative to the ground may be adjusted. A coupling connects between the hanger and the tines such that the height of the front end of the harrow frame is adjusted in response to tine angle adjustment.

Abstract: A harrow drawbar assembly is described which includes a harrow frame with depending tines and at least one spring strap. The at least one spring strap has a first end and a second end. The second end of the at least one spring strap is secured to the harrow frame. Means is provided for attaching the first end of the at least one spring strap to a drawbar. The at least one spring strap extends substantially horizontally from the drawbar and serves as means by which the harrow frame is pulled by the drawbar. The at least one spring strap exerts a downward pressure upon the harrow frame to maintain the tines of the harrow frame in contact with a ground surface. This harrow drawbar assembly is intended to restrict vertical movement and generally improve the ability of the harrow to follow ground surface contours.

Abstract: A spring tooth harrow comprising an elongated tool bar having a plurality of harrow sections secured thereto by adjustable mounting brackets to enable the harrow section to be raised or lowered with respect to the draw bar. Each harrow section includes a pair of longitudinally extending arms which are pivotally secured to the mounting brackets and which are urged downwardly with respect thereto by pairs of springs. Fork pipes are rotatably mounted on the arms and extend therebetween and have spring teeth secured thereto. The pipes may be rotatably moved in unison to change the angle of attack of the spring teeth or the forwardmost pipe may be independently rotated with respect to the remaining pipes so that the angle of attack of the forwardmost spring teeth may be varied with respect to the trailing spring teeth.

Abstract: A spring tooth harrow comprising an elongated tool bar having a plurality of harrow sections cured thereto by adjustable mounting brackets to enable the harrow section to be raised or lowered with respect to the draw bar. Each harrow section includes a pair of longitudinally extending arms which are pivotally secured to the mounting brackets and which are urged downwardly with respect thereto by pairs of springs. Fork pipes are rotatably mounted on the arms and extend therebetween and have spring teeth secured thereto. The pipes may be rotatably moved in unison to change the angle of attack of the spring teeth or the forwardmost pipe may be independently rotated with respect to the remaining pipes so that the angle of attack of the forwardmost spring teeth may be varied with respect to the trailing spring teeth.

Abstract: A universal auxiliary implement mount for agricultural implements utilizes spaced, parallel, triangular plate members for attachment and selective positioning on respective tool bars of different main implements. A draw tongue is pivotally attached to one pair of a pair of mounting apertures extending through central portions of the triangular plate members. A biasing rod has one end which is pivotally attached to the draw tongue and extends in an upward angle with the other end thereof received in an apex portion of the triangular plate members. The biasing rod has a spring therewith which selectively exerts downward pressure on the draw tongue while allowing vertical movement over rough ground surfaces.

Abstract: A thatch rake consisting of a frame carrying a multiplicity of downwardly projecting spring teeth dragging the ground and supporting the frame, said teeth being biased forwardly and downwardly but sprung rearwardly by forward motion of the frame, each tooth having a stop member intermediate its ends engageable with the frame after partial springing thereof to reduce its effective length so that portion between the stop and its free end, so as to increase its effective stiffness, and being so supported as to provide a pronounced downward movement thereof if allowed by ground contour to recover forwardly, so as to be enabled to follow uneven ground contours accurately, all of the teeth being connected loosely to allow only limited relative forward and rearward movement thereof, so as to prevent possible bouncing or "leapfrogging" movements of the rake.

Abstract: A mulch loosening rake consisting of a frame carrying a multiplicity of downwardly projecting spring teeth dragging the ground, said teeth being biased forwardly and downwardly but sprung rearwardly by forward motion of the frame, each tooth having a stop member intermediate its ends engageable with the frame after partial springing thereof to reduce its effective length to the portion between the stop and its free end, so as to increase its effective stiffness, and being so supported as to provide a pronounced downward movement thereof if allowed by ground contour to recover forwardly, so as to be enabled to follow the ground contour accurately.

Abstract: For use in a trailing arm assembly having a support frame and a spring-loaded trailing arm pivotally mounted on the support frame, an adjustable stop element is provided for limiting the downward deflection of the trailing arm. The stop element is a rotatable eccentrically mounted element having a polygonal cross section, the surfaces around the polygon adjustably engaging the underside of the trailing arm, thereby adjustably limiting the downward deflection of the trailing arm. The deflection limiting element may conveniently be in the form of a rectangular parallelepiped eccentrically mounted between two guide plates which provide lateral support for the trailing arm.