Shank assembly for attaching an applicator knife to a tool bar

Abstract From the Canadian patent

An applicator knife can be rigidly attached to the lower end of a rigid shank which is pivotably mounted at its upper end to a support member which is securely fixed to a tool bar to be drawn by a tractor. A narrow face of the shank faces in a forward direction. A spring arrangement between the shank and the support member permits the shank to pivot about its mounting when a predetermined force acts on the knife in a backward direction, permitting the knife to clear obstacles whilst being normally maintained at a desired depth in the ground. The applicator knife serves for supplying a gaseous, liquid, or granular substance such as a fertilizer, insecticide, herbicide or seed into the, …