| 摘要 |
PURPOSE:To prevent wrong operations by a method wherein an electrical horn and a pneumatic horn different in horn sound are controlled and operated with are pedal. CONSTITUTION:When the pedal 3 is pressed down to position A, an acting part 4 moves by the action of the lever. A movable contactor 9 rises with the movement of the acting part 4, an electric switch is made up by coming in contact with an electric switch fixed contact point 7 and an electrical horn 8 sounds. When a tread part 5 is pushed down to a position B, the puoh rod 19 of a movable value continues to rise, an air valve 17 is opened by pushing up an air valve rod 18, compressed air in a compressed air chamber 12 is supplied to an air horn 22 through an exhaust port 13 and the air horn sounds. At this time, the movable contactor 9 is in contact with the fixed contact point 7 and the electrical horn 8 continues to sound. |
