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An internal combustion actuated fastener driving device in which a simple container supply of fuel under pressure carried in a handle portion of the portable housing assembly feeds to a supply chamber controlled by an actuating valve operable in response to a manual acuating procedure to be spring m

An internal combustion actuated fastener driving device in which a simple container supply of fuel under pressure carried in a handle portion of the portable housing assembly feeds to a supply chamber controlled by an actuating valve operable in response to a manual acuating procedure to be spring moved into an operative position. The movement of the actuating valve into its operative position communicates a previously formed charge of gaseous fuel under pressure in a separate charge chamber with a series of nozzles so as to discharge in jet stream formations which aspirate fresh air through inlets to mix therewith in a mixing chamber for passage into a combustion chamber in open condition controlled by a main valve. The main valve moves under spring bias into a closed position in response to the depletion of gaseous fuel pressure within the charge chamber in timed relation with the crowding of the spent gases from the combustion chamber by the new combustible mixture. Ignition is in response to the closing of the main valve by a piezoelectric unit. The piston is driven by the energy of the combustion of mixture which initially is at generally atmospheric pressure. The return stroke of the piston is effected by a spring system which is active only at the end of the drive stroke and beginning of the return stroke.

대표청구항 ▼

An internal combustion actuated portable tool comprising a housing assembly including a workpiece engaging portion having means defining a fastener drive track therein, a main body portion above said workpiece engaging portion defining an acceptable housing profile and having means defining a cylind

An internal combustion actuated portable tool comprising a housing assembly including a workpiece engaging portion having means defining a fastener drive track therein, a main body portion above said workpiece engaging portion defining an acceptable housing profile and having means defining a cylindrical drive chamber therein and a handle portion extending transversely from said main body portion for enabling a user to manually move the housing assembly in portable fashion, a drive piston slidably sealingly mounted in said cylindrical drive chamber for movement through repetitive cycles each of which includes a drive stroke and a return stroke, a fastener driving element operatively connected with said piston and mounted in said fastener drive track for movement therein through a drive stroke in response to the drive stroke of said piston and a return stroke in response to the return stroke of said piston, magazine means carried by said housing assembly for containing a supply of fasteners and feeding successive leading fasteners of the supply into said fastener drive track to be driven therefrom by said fastener driving element during the drive stroke thereof, combustion chamber means above said drive chamber within the acceptable profile defining portion of said housing assembly communicating with an upper open end of said drive chamber, an annular mixing chamber within said housing assembly in surrounding relation with said cylindrical drive chamber below said combustion chamber means, fresh air inlet means communicating with a lower portion of said mixing chamber within said housing assembly, main valve means movable between (1) an open position wherein said combustion chamber means is open at a position of communication with an upper portion of said annular mixing chamber and at a spaced position of communication with the atmosphere and (2) a closed position wherein said combustion chamber means is closed from communication with said mixing chamber and the atmosphere, gaseous fuel chamber means within said housing assembly, a series of annular spaced nozzles operable when a predetermined charge of gaseous fuel under pressure from said gaseous fuel chamber means is communicated therewith to direct said charge into said annular mixing chamber in jet stream formations with said combustion chamber means open so that the jet stream formations are operable (1) to cause fresh air from said fresh air inlet means to be entrained and mixed with the charge of fuel forming the jet stream formations and (2) to cause the jet stream formations of fuel mixed with entrained air to flow from said mixing chamber into the open combustion chamber means and move sufficient residual gas in said combustion chamber means therethrough and into the atmosphere to fill the combustion chamber means with a charge of combustible gases in the form of an air-fuel mixture, means for igniting a charge of combustible gases in said combustion chamber means, and means operable in response to a predetermined manual actuating procedure for (1) causing a predetermined charge of gaseous fuel under pressure within said gaseous fuel chamber means supplied thereto from a source of fuel under pressure to be communicated with said series of nozzles so as to fill said combustion chamber means with a charge of combustible gases, (2) causing said main valve means to move from said open position into said closed position in timed relation to the filling of the combustion chamber means with the charge of combustible gases, and (3) causing said igniting means to ignite the charge of combustible gases in said combustion chamber means while the charge is at generally atmospheric pressure so as to create pressure conditions in said combustion chamber means in communication with said drive chamber sufficient to drive said drive piston and said fastener driving element through a drive stroke.