Abstract: There is provided a sensing system compatible with articulating axles whereby the angular difference between the axles is sensed by a limit switch. A spring loaded contact arm carried by one axle is used to trip a limit switch carried by the other axle.

Abstract: An automatic locking device is provided for a telescoping work platform that includes: a base frame, a middle frame and a platform frame, the locking device comprises a first sliding member mounted in the middle frame, a first notch in the base frame for receiving said first sliding member and a first cam on said platform for disengaging said first member from said first notch, it also comprises a second sliding member mounted to the middle frame, a second notch in the base frame for receiving said second member and a second cam on said base frame for disengaging said second member from said second notch.