Caulking Gun Load Sensitive Variable Ratio Drive Device

Abstract

Disclosed systems provide cost effective dispensers of construction sealant, sausage tubes and other products having varied and even unknown levels of viscosity. A variable ratio drive cam pivots in response to the trigger tension caused by the viscosity of the material to be dispensed. In a relative high force mode, encountered with high viscosity payloads, the drive cam slightly pivots, keeping the distance traveled by the drive rod relatively small in response to a pull of the trigger. This results in a relatively high thrust ratio. Conversely, in dispensing a product with a relatively low viscosity, the drive cam pivots by a greater degree, causing a longer movement of the drive rod in response to the distance traveled by the trigger resulting in a lower thrust ratio. The system works well in caulking guns, bulk loading tools and multi tube tools, such that multiple tools are not required.

Dependencies are inferred from the claim text.