Fastener-driving tool with one or more combustion chambers and an exhaust gas recirculation system
AssigneeIllinois Tool Works Inc.
InventorsChinbay Q. Fan, Patrick Talano, James Haberstroh
Life of this patent
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Abstract
Various embodiments of the present disclosure provide a combustion-powered fastener-driving tool including multiple combustion chambers and an exhaust gas recirculation system.
Claims8
A method of operating a fastener-driving tool including a housing, a combustion chamber in the housing, a cylinder in the housing, a piston chamber in the cylinder, a piston in the piston chamber and movable relative to the cylinder from a pre-firing position to a firing position and back to the pre-firing position, and a driver blade attached to the piston, said method comprising:
- communicating a first portion of exhaust gases from the combustion chamber to atmosphere via an exhaust conduit;
- and
- communicating a second portion of the exhaust gases from the combustion chamber back to the combustion chamber to aid in thermal efficiency by diluting incoming fresh air with the second portion of the exhaust gases, where second portion of the exhaust gases are all or mostly comprised of noncombustible gases and absorbents of combustion heat.
A method of operating a fastener-driving tool including a housing, an air chamber in the housing, a first combustion chamber in the housing, a second combustion chamber in the housing, a cylinder in the housing, a piston chamber in the cylinder, a piston in the piston chamber and movable relative to the cylinder from a pre-firing position to a firing position and back to the pre-firing position, and a driver blade attached to the piston, said method comprising:
- communicating a first portion of exhaust gases from the second combustion chamber to atmosphere via an exhaust conduit;
- communicating a second portion of the exhaust gases from the second combustion chamber to the air chamber;
- and
- communicating a third portion of the exhaust gases from the second combustion chamber to the piston chamber to assist in returning the piston back to the pre-firing position.
Dependencies are inferred from the claim text.