Fastener driving tool

Abstract

A fastener driving tool for fixation of parts by way of nails or staple propelled by a driving piston under the effect of the combustion of one or more fluids. More specifically, a device of controlling the relative proportions of the fluids used for combustion including a combustion chamber having a first inlet port for inputting a first fluid having at least one variable fluid characteristic, and a second inlet port for inputting a second fluid. A first actuator is operably coupled to said first inlet port, adapted to switch between a first open state, allowing said first fluid to move into said combustion chamber at a first mass flow rate that is dependent on said at least one variable fluid characteristic, and a first closed state, preventing or at least limiting said first fluid from moving into said combustion chamber. A second actuator is operably coupled to said second inlet port, adapted to switch between a second open state, allowing said second fluid to move into said combustion chamber at a second mass flow rate, and a second closed state, preventing said second fluid from moving into said combustion chamber. A controller is configured to operate any one of said first and second actuators and to control a time interval of said first open state and/or said second open state based on at least one predetermined parameter, so as to provide a predetermined mass ratio of said first and second fluid within said combustion chamber.