Patent ID: 7392922

Claim:
A fuel cell for use with a combustion tool, comprising: a housing defining an open end enclosed by a closure; a main valve stem having an outlet, disposed in operational relationship to said open end and reciprocable relative to said housing at least between a closed position wherein said stem is relatively extended, an open position wherein said stem is relatively retracted and a container filling position wherein said stem is retracted further than in said open position to allow filling of a container within said housing through said outlet, said valve including a fuel metering chamber disposed in close proximity to said closure and configured so that when said stem is in said open position, only a measured amount of fuel is dispensed through said outlet, said fuel metering chamber being defined in part by a main seal forming a wall of said chamber and a body having a valve stem seal, wherein said stem has an exterior including a first diameter section defining a non-sealing relationship with said valve stem seal in said closed position, a second diameter section being enlarged with respect to said first diameter and defining a sealing relationship with said valve stem seal in said open position, and a third diameter section being reduced with respect to said first diameter and defining a clearance with said valve stem seal in said container filling position; wherein said housing includes a separate fuel container, wherein the flow of fluid out the outlet of the fuel cell is solely from said separate fuel container.