Portable drill having an internal combustion engine

Abstract

A portable drill having an internal combustion engine and a shiftable gear mechanism is provided. The gear mechanism has an output shaft for driving a tool. An input shaft of the gear mechanism is driven by a crankshaft of the internal combustion engine. The gear mechanism is provided with a neutral speed or gear setting in which the output shaft is uncoupled from the input shaft.

I claim:  
     
         1 . A portable drill having an internal combustion engine with a crankshaft, comprising: 
 a shiftable gear mechanism that is accommodated in a housing, wherein said gear mechanism has an output shaft for driving a tool, and has an input shaft that is driven by said crankshaft of said internal combustion engine, and wherein said gear mechanism is provided with a neutral gear setting in which said output shaft is uncoupled from said input shaft.    
     
     
         2 . A portable drill according to  claim 1 , wherein said gear mechanism is provided with at least a first gear setting and a second gear setting.  
     
     
         3 . A portable drill according to  claim 2 , wherein said gear mechanism is provided with a further gear setting for reversal of a direction of rotation of said output shaft.  
     
     
         4 . A portable drill according to  claim 2 , wherein said neutral gear setting of said gear mechanism is disposed in such a way that it is possible to directly select therefrom either said first gear setting or said second gear setting.  
     
     
         5 . A portable drill according to  claim 2 , wherein a gear shifting mechanism is provided on said gear mechanism and is actuatable during non-running of said internal combustion engine.  
     
     
         6 . A portable drill according to  claim 2 , wherein a gear shifting mechanism is provided on said gear mechanism and is actuatable in an idling speed range of said internal combustion engine when the latter is in operation.  
     
     
         7 . A portable drill according to  claim 2 , wherein a gear shifting mechanism is provided on said gear mechanism and is provided with an actuating element for a manual selection of one of said gear settings, and wherein said actuating element is mounted in said housing of said gear mechanism.  
     
     
         8 . A portable drill according to  claim 7 , wherein said actuating element is a rotary knob, and wherein by rotation of said rotary knob it is possible to select the following gear settings of said gear mechanism: reversal of direction of rotation, first gear setting, neutral gear setting, second gear setting, and vice versa.  
     
     
         9 . A portable drill according to  claim 8 , wherein said rotary knob is provided with an elongated grip element that in turn is provided with a projection that points to symbols on said housing that indicate a selected gear setting of said gear mechanism.  
     
     
         10 . A portable drill according to  claim 8 , wherein said rotary knob is provided with a crossbar that is provided with a projection that points to a symbol on said housing that indicates a selected gear setting of said gear mechanism.  
     
     
         11 . A portable drill according to  claim 7 , wherein said actuating element is disposed on a side surface of said portable drill or of said housing.