Patent ID: 7686096

Claim:
A brake system for a detachable agricultural implement towed by a tow vehicle, the detachable agricultural implement having a frame movably supported by a wheel assembly having an axle and a first tongue member configured in telescoping relation to a second tongue, the second tongue member configured to pivotally interconnect the frame at a drawbar of the tow vehicle, the detachable agricultural implement defined by a central longitudinal axis relative to a forward direction of travel, said frame connected to an implement assembly having a plurality of planting row devices, the wheel assembly having an outer tread surface, the brake system comprising: a pivot linkage pivotally connected at the frame of the detachable agricultural implement; said pivot linkage comprises a first plate member spaced from a second plate member, the first and second plates both vertically aligned and generally parallel to each other and having opposing first and second ends; said second ends of first and second plate members includes a slot; the pivot linkage includes generally horizontal aligned first and second intermediate bars fixedly interconnected between the first and second plates, wherein said second intermediate bar is located forward of said first intermediate bar; and a brake arm attached at the pivot linkage; said brake arm includes an elongated bar having a first end opposite a second end, wherein the pivot linkage is attached at a generally central location between the first and second ends, and further comprising a brake pad assembly located at the first and second ends of the brake arm, wherein the brake pad assembly is configured to engage against the outer circumferential tread surface of the wheel assembly; the brake arm is generally aligned perpendicular to the central longitudinal axis of the agricultural implement; wherein said slot of said first and second plate members receives said brake arm; and an actuator cylinder having an upper end and a lower end interconnected between the pivot linkage and the frame, wherein said upper end of the actuator cylinder is pivotally connected at the horizontal aligned first intermediate bar; wherein said lower end of the actuator cylinder connected to said frame by an actuator support structure comprising a lower support arm and an upper support arm; said upper support arm is angled connected between the frame and the axle of said wheel assembly; wherein movement of the actuator cylinder causes the brake arm to engage against the outer circumferential tread surface of the wheel assembly and restrain movement of the wheel assembly and frame of the agricultural implement as the tow vehicle moves the second tongue member in telescoping relation to the first tongue member; wherein said brake system restrains said wheel assembly and the frame assembly of said detachable agricultural implement, said tow vehicle moves in a telescoping relation to said first tongue member to further move said second tongue member between a retracted position and an extended position.