Spring trip shank assembly having quick-dropping trip-out force and improved resetting ability

Abstract From the Canadian patent

The spring trip assembly has lever mechanism between the shank and the compression spring which causes the trip-out force of the shank to drop sharply once the relatively high, initial trip-out force level has been reached thus permitting the, shank to slide up and over obstructions without breakage. The compression spring is actuated from both ends simultaneously as the shank rises so that although the trip force drops off quickly, energy also builds up quickly in the spring. Thus the trip force does, not drop as low as it otherwise would assuring that ample return force is available to reset the shank down into the soil in its working position. Various components of the assembly can be …