Importance

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Abstract

A fastener driving device comprising a combustion chamber, a piston and a fastener channel. The piston is coupled to the combustion chamber and slidable within a sleeve such that combustion gas expansion in the combustion chamber causes the piston to slide from a first position to a second position. The fastener channel is configured to receive a fastener, wherein when moving from the first position to the second position the piston is configured to engage the fastener and drive it from the device. According to a first example the device further comprises a return chamber configured to receive gas from the sleeve via a first vent, and the device comprises a second vent coupled to the return chamber and configured to supply combustion gas from the combustion chamber to the return chamber. According to a second example the combustion chamber comprises a moveable housing portion, wherein combustion gas expansion in the combustion chamber acts on the moveable housing portion such that the moveable housing portion moves in a first direction to open the combustion chamber and exhaust combustion gases.

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First Claim