Patent ID: 7644780
Filing Date: 2010-01-12
Classification: A01B,Y10T

Abstract:
1. A folding marker for connection to a toolbar of an agricultural implement, comprising: a marker shoulder pivot configured for connection to the toolbar; an inner arm pivotally connected to the marker shoulder pivot; a double acting hydraulic cylinder pivotally connected to the marker shoulder pivot and connected approximately in parallel with the inner arm; a middle arm bracket pivotally connected to the inner arm and the double acting hydraulic cylinder; a middle arm connected to the middle arm bracket, the middle arm including a first beam and a second beam extending from the middle arm bracket and terminating at an outer arm pivot, a crossbrace connected between the first beam and the second beam, and a third beam connected between the middle arm bracket and the crossbrace; an outer arm pivot bracket pivotally connected to the outer arm pivot; an outer arm connected to the outer arm pivot bracket, the outer arm having a first leg and a second leg each connected at one end to the outer arm pivot bracket, the first leg and the second leg connected at an other end to a plate assembly, the first leg and the second leg defining a channel therebetween; and an adjustable arm assembly slidably connected within the channel, the adjustable arm assembly including an extension element insertable within the channel and lockable along the extension element with the plate assembly, and a marking element connected to the extension element; wherein the outer arm pivot bracket includes a platform connected to the outer arm pivot and a cable brace extending from the platform; further including a channel plate assembly pivotally connected to the cable brace, a cable bracket connected to the inner arm, and a cable connected between the channel plate assembly and the cable bracket; further including a spring in line with the cable; wherein the middle arm bracket includes a breakaway pivot and a breakaway bolt mechanism opposite thereto; wherein the breakaway bolt mechanism includes a bolt on a forward direction of travel side of the middle arm bracket, the bolt configured for breaking when the folding marker hits an obstruction creating a load condition on the bolt which exceeds a predetermined load value which breaks the bolt, the middle arm pivoting about the breakaway pivot when the bolt breaks; further including an assist wheel connected to the middle arm on a same side as the breakaway pivot; further including a marker stop connected to the middle arm; further including a hydraulic system in fluid communication with the double acting hydraulic cylinder, the hydraulic system having a marker valve assembly including a fixed orifice in an inlet of the marker valve assembly, the fixed orifice controlling a lift speed and a lower speed of the folding marker; further including a second folding marker connected to an other end of the toolbar, the second folding marker including a second double acting hydraulic cylinder; wherein the hydraulic system includes a first poppet type solenoid valve in fluid communication with the first double acting hydraulic cylinder and a second poppet type solenoid valve plumbed in parallel with the first poppet type solenoid valve and in fluid communication with the second double acting hydraulic cylinder; wherein said first and second poppet type solenoid valves allow continual flow of fluid to said first and second double acting hydraulic cylinder to allow said folding marker to continue to raise after said agricultural implement has been raised for field transport position; wherein when said first and second poppet type solenoid valves de-energize, flow of fluid continues to said first and second double acting hydraulic cylinders; further including an electronics module, wherein the hydraulic system includes a pressure switch connected to the electronics module, the pressure switch sensing a pressure at an input of the first poppet type solenoid valve and the second poppet type solenoid valve reaching a predetermined value, the combination of electronics module and the pressure switch causing one of the solenoid valves to energize and the other of the solenoid valves to de-energize providing automatic alternating marker operation wherein each of the first double acting hydraulic cylinder and the second double acting hydraulic cylinder includes a rod end, the hydraulic system includes in fluid communication with each rod end a check valve in parallel with an orifice to restrict flow in one flow direction to allow a respective folding marker to rest on a marker stop during lowering of the respective folding marker.