ALARMING DEVICE FOR CONSTRUCTION MACHINE

PURPOSE:To make it possible to actuate an alarming device in various conditions p in accordance with the working kinds and situations, by forcing a movable contact to get into contact with a required stationary contact by means of a changeover switch selecting pressure switches. CONSTITUTION:A movable contact (v) of a changeover switch 14 is forced to contact a stationary contact (w) to electrically connect an alarming device 13 to the pressure switch 11A. In this state, the pilot pressure is conducted to one of pilot pipes (c), (d) by an operation lever 8a in order to drive the second actuator. Next, the alarm 13 is actuated by the closing motion of the pressure switch 11A and the working condition of the second actuator 6 is detected as the actuating condition of the alarm 13 by the pressure switch 11A. When the movable contact (v) touches the stationary contact (y), the alarm 13 is connected to only the pressure switch 11 to bring the alarm 13 to the working condition by making the first actiator 4 to be in the working state. In this case, when the movable contact (v) gets in contact with the stationary contact (x), it is connected to both pressure switches 11, 11A and hence, the stationary contacts w, x, y can be selected.