Abstract: The invention relates to a gasoline motor powered, hand-operated working machine, which is stopped by short-circuiting an electric circuit (70), said stop device being designed in the form of an electric switch comprising a stop control (11), which can be moved manually between two end positions; a drive position for start of the motor and for motion of the motor, in which drive position said circuit is not short-circuited, and a fixed stop position in which the circuit is short-circuited and the stop control is locked.

Abstract: The invention relates to a portable, hand-operated working machine (1) with a tool which is rotatable by an engine through a driving shaft (20), and a transmission comprising a centrifugal coupling, a driving belt (8) and a driving wheel with a groove (7) for the driving belt fitting in said groove, which driving wheel comprises an outer (3) and an inner (4, 4′) half of the driving wheel, wherein the outer half (3) of the driving wheel consists of an inner wall of a coupling drum (11) being part of the centrifugal coupling, which drum is rotated by the driving shaft when the centrifugal coupling is in the operative state.