Crop sprayer

Claim 1

A crop sprayer including a main frame, ground engaging wheels connected to the main frame, a spray tank mounted on said frame and adapted to contain a liquid agricultural chemical therein, an elongate horizontally disposed boom assembly extending transversely of said main frame and including an elongate central boom, a pair of similar elongate outer booms, each having its inner end pivotally connected to an outer end of said central boom for pivoting movement of each outer boom about a vertical axis, a pair of castor wheel assemblies, means connecting the outer end portion of each outer boom with one of said castor wheel assemblies and permitting vertical translation of the outer boom assembly relative to the associated castor wheel assembly, a spray device on said boom assembly including a plurality of spray nozzles connected in communicating relation to the tank and being operable to spray the liquid agricultural chemical upon a standing crop, a vertically disposed support frame on said mounting frame and extending upwardly therefrom, means on said central boom engaging said support frame for permitting vertical translation of the central boom relative to the support frame, power means on said support frame, means connecting said power means with said central boom whereby actuation of said power means will cause vertical translation of said central boom relative to said support frame, elongate flexible tensioning means interconnecting said support frame with said castor wheel assemblies and being engaged by said central boom and said outer booms whereby, when said power means is actuated to produce upward translation of said central boom, said tensioning means will be tensioned to cause simultaneous upward translation of said outer booms relative to said castor wheel assemblies.