Mechanism for increasing force of manual effort applied to drive e.g. of veterinary drug dosing gun has tubular gear rotated by guides

摘要

The mechanism as a tubular gear (C) rotated by guides on a front handle (A) when a manual pressure is applied to front and rear (B) handles. The gear has internal and external spiral ribs running in opposite directions and at an angle of 45 degrees to its axis, and its rotation produces a lengthwise thrust on a piston (D). The number of spiral ribs and grooves can vary between 1 and 20, depending on requirements.