Patent ID: 7143752

Claim:
Device for preheating of the inlet air to a combustion engine powered portable tool, said device is activated or deactivated depending on the need of preheating of the inlet air, said tool comprising crankcase ( 10 ), a crankshaft ( 15 ) and a carburettor ( 19 ), characterised in that the inlet air to the carburettor ( 19 ) is led via a first channel ( 14 ) that is integrated in the crankcase ( 10 ) when the preheating of the inlet air is activated and led via a second channel ( 16 ) placed outside the crankcase ( 10 ) when the the preheating of the inlet air is deactivated; and characterised in that the inlet air enters a muffler ( 11 ) and then continues via the selected first or the second channel ( 14 , 16 ) to an air filter ( 18 ) before it reaches the carburettor ( 19 ).