Fastener driving apparatus

Abstract

The invention concerns a fastener-driving apparatus comprising a tank ( 8 ) for storage of a fuel, in particular a liquefied gas, a combustion chamber ( 4, 5 ) connected to the tank ( 8 ) via a valve element ( 9 ), where the combustion chamber ( 4, 5 ) has a movable piston ( 3 ) to advance a driving ram ( 2 ), and an ignition device for ignition of an air-fuel mixture in the combustion chamber, where an injection line ( 10, 11, 12 ) is provided between the tank ( 8 ) and the combustion chamber ( 4, 5 ), where the injection line ( 10, 11, 12 ) has optimization with regard to an expansion and/or transport time.

1 . A fastener-driving apparatus comprising
 a receptacle for a tank for storing a fuel   a combustion chamber that can be connected to the tank via a valve element where the combustion chamber has a movable piston to advance a driving ram and   an ignition device for ignition of an air-fuel mixture in the combustion chamber, and   an injection line provided between the tank and the combustion chamber, where the injection line has a thermally conductive element.   
     
     
         2 . The driving apparatus as in  claim 1 , wherein the injection line is in thermal contact with an outer wall of the combustion chamber. 
     
     
         3 . The driving apparatus as in  claim 1 , wherein the thermally conductive element comprises a wall segment, which extends outwardly from an outer wall of the injection line. 
     
     
         4 . The driving apparatus as in  claim 3 , wherein the wall segment extends along the injection line. 
     
     
         5 . The driving apparatus as in  claim 3 , wherein the wall segment is in thermal contact with an outer wall of the combustion chamber. 
     
     
         6 . The driving apparatus as in  claim 1 , wherein the thermally conductive element comprises a wall segment, which extends inwardly from an outer wall of the injection line. 
     
     
         7 . The driving apparatus as in  claim 6 , wherein the wall segment extends along a direction of flow of the combustion gas in the injection line. 
     
     
         8 . The driving apparatus as in  claim 6 , wherein the injection line has two flow chambers for the fuel and the wall segment separates the two flow chambers from each other. 
     
     
         9 . The driving apparatus as in  claim 1 , wherein the injection line has at least in a segment a plurality of hydraulically and/or geometrically parallel branch lines. 
     
     
         10 . The driving apparatus as in  claim 9 , wherein at least two of the branch lines are configured as separate positioned lines. 
     
     
         11 . The driving apparatus as in  claim 10 , wherein at least one of the separate branch lines is in thermal contact with an outer wall of the combustion chamber. 
     
     
         12 . The driving apparatus as in  claim 10 , wherein the separate branch lines open into the combustion chamber at points that are separate from each other. 
     
     
         13 . The driving apparatus as in  claim 12 , wherein jets of fuel injected into the combustion chamber from the branch lines cross. 
     
     
         14 . The driving apparatus as in  claim 1 , wherein the thermal conductive element comprises a material with a thermal conductivity of more than 70 W/(m·K). 
     
     
         15 . The driving apparatus as in  claim 1 , wherein the thermal conductive element is arranged downstream from the valve element. 
     
     
         16 . The driving apparatus as in  claim 2 , wherein the injection line contacts the outer wall of the combustion chamber. 
     
     
         17 . The driving apparatus as in  claim 2 , wherein the thermally conductive element comprises a wall segment, which extends outwardly from an outer wall of the injection line. 
     
     
         18 . The driving apparatus of  claim 5 , wherein the wall segment contacts the outer wall of the combustion chamber. 
     
     
         19 . The driving apparatus as in  claim 17 , wherein the wall segment extends along the injection line. 
     
     
         20 . The driving apparatus as in  claim 4 , wherein the wall segment is in thermal contact with an outer wall of the combustion chamber.