Patent ID: 6158643
Filing Date: 2000-12-12
Classification: B25C

Abstract:
A fastener driving tool operable through an internal combustion driven piston, the tool comprising:a. a driver body comprising a piston housing, a piston housed in the piston housing, a driving member attached to the piston; a combustion chamber defined by the driver body, piston housing and piston; the piston and driving member being axially arranged and configured within the piston housing to drive a fastener upon combustion of a mixture of fuel and air in the combustion chamber;b. the piston comprising a self-lubricating compression ring and a piston body; the compression ring being arranged and configured to be retained around the circumference of the piston body and to form a seal between the piston body and the piston housing; the self lubricating compression ring comprising an arcuate cross-section membrane having two ends and extending from one end at the piston body to the other end the piston housing;c. the self-lubricating compression ring forming a durable seal in the absence of added lubricant.