Importance

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Abstract

A harrow comprises an elongate tool bar formed in three sections including a central section and two wing sections all of which can rotate about a longitudinal axis, The wing sections are coupled by pivot couplings which allow the wing sections to fold rearwardly in the transport position. The tool bar carries a number of harrow elements each of which is formed by a rigid frame defined by longitudinal rails and welded cross bars with the frame carrying a plurality of tine support bars. A push rod simultaneously rotates all of the tine support bars about their respective axis to vary the angle of the tine in contact with the ground. The angle of the tines of all of the harrow elements are adjusted simultaneously by a number of rocker shafts mounted on the tool bar and operated by rephasing cylinders. Each push bar of each harrow element is attached to the respective rocker shaft for actuation. The harrow frame is mounted on a bracket passing underneath the square section tool bar and pivots about a horizontal axis just rearward of the tool bar with tension springs forwardly of the tool bar pulling the frame upwardly. The tool bar can be rotated beyond the horizontal position to apply downward pressure on the harrow frame against the ground.

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First Claim