Patent ID: 7364096
Filing Date: 2008-04-29
Classification: A01C,A01M,B05B

Abstract:
1. A sprayer for spraying a liquid onto an upwardly facing surface, the sprayer being carried on a vehicle for moving the sprayer over the surface, which comprises: (a) a center boom carried on the vehicle; (b) a pair of wing booms pivotally mounted to opposite ends of the center boom; (c) a plurality of downwardly facing spray nozzles carried on the center and wing booms for spraying liquid downwardly onto the upwardly facing surface; (d) a breakaway pivot between each wing boom and each end of the center boom, each breakaway pivot configured to permit bi-directional pivoting of the wing boom relative to the center boom should the wing boom strike an obstruction during forward or reverse motion of the sprayer, wherein the breakaway pivot includes at least a first pair of cams that are nested together preceding a breakaway event and that become at least partially non-nested during a breakaway event; and (e) a member forming an enclosed chamber around the nested first pair of cams, and wherein the breakaway pivot includes at least one fitting for adding a lubricant to the chamber to lubricate movement of one cam in the first pair relative to the other cam in the first pair.