Ladder e.g. stand, for use on underground, has step, ladder stringer, rung or support connected to alarm device for signaling insecure operating position of ladder, where device is connected to sensor activating device while using ladder

摘要

The ladder has steps (2) extending between ladder stringers (1), rungs or supports (3). One of the steps, the ladder stringers, the rungs or the supports is connected to an alarm device (4) for optically and/or acoustically and/or vibrationally signaling an insecure operating position of the ladder. A sensor (5) e.g. weight sensor, is arranged at an end of the stringers, where the sensor has a light barrier. The alarm device is connected to the sensor, which activates the alarm device while using the ladder.