Patent ID: 6871623

Claim:
A working machine including an internal combustion engine, said working machine comprising: a single operation unit for switching between stop, start and choke operations of said engine, said operation unit including a rotatable body capable of being rotationally moved according to a manual operation; a choke open/close mechanism for an intake system of said engine, said choke open/close mechanism including a choke valve, a choke shaft for rotating said choke valve, and an arm attached to said choke shaft; and a choke-activating link member adapted to be moved in its longitudinal direction to transmit the movement of said rotatable body to said arm so as to close said choke valve, said choke-activating link member having a distal end coupled with said arm and a proximal end coupled with said rotatable body and extending between said distal and proximal ends, wherein said rotatable body is adapted to be switchably moved in turn from a first rotational position for stopping said engine, through a second rotational position for allowing said engine to be started, to a third rotational position for activating said choke open/close mechanism, and said rotatable body is formed with an elongated slot which receives therein said proximal end such that when said rotatable body is rotated from said first rotational position to said second rotational position, said proximal end is allowed to displace relative to said rotatable body along said elongated slot without causing any movement of said choke-activating link member in said longitudinal direction, and when said rotatable body is rotated from said second rotational position to said third rotational position, said proximal end is restricted in its displacement along said elongated slot so that said choke-activating link member is moved in said longitudinal direction in response to the rotational movement of said rotatable body to transmit the movement of said rotatable body to said arm.