Patent ID: 7926690

Claim:
A combustion powered driver comprising: a driver body defining a combustion chamber; a fuel injection valve configured to selectively control a flow of fuel into the combustion chamber; an ignition module configured to ignite fuel within the combustion chamber; a ram movable within the driver body, wherein the ram includes a metallic piston impact portion spaced apart from a post receiving portion that defines a cavity dimensioned to receive a post; a piston movable within the driver body, wherein the piston is configured to impact the ram responsive to combustion within the combustion chamber; a biasing member configured to urge the piston apart from the ram; wherein the piston overcomes the urging of the biasing member to impact the piston impact portion of the ram responsive to combustion within the combustion chamber; and wherein the piston impact portion is suspended on a resilient portion extending between the piston impact portion and the post receiving portion, wherein the resilient portion absorbs a portion of an impact force from the piston impacting the piston impact portion.