AN IMPROVED HAND-OPERATED KNAPSACK SPRAYER.

摘要

a tank for holding liquid agro-chemicals, a pump mounted on one side of tank to generate the pressure for spraying said liquid agro-chemicals from said tank, and a pump operating mechanism mounted at the bottom of said tank characterized in that the said pump operating mechanism includes a handle and a rack & pinion arrangement for converting the oscillating motion of the handle into rectilinear motion of the piston rod.