Abstract: An emergency vehicle circuit breaker having a non conductive base plate with two contacts thereon spaced apart to form a non conductive gap, one contact connected to a battery and one contact to an electric starter motor. A non conductive front plate is attached to the non conductive base plate by a hinge with a third contact thereon aligned with the gap to form an electrical contact between the two contacts on the base plate and a cable means for remote manual movement of the front plate toward and away from the base plate whereby the third contact may be engaged and disengaged from the gap, thereby making and breaking an electrical circuit.

Abstract: An overhead suspension load transporting trolley which is suspended from a track, such as the flange of an I beam, which has a drive wheel suspended below a carriage, which wheel is biased against the I beam by a counterweight on the opposite end of a lever from the drive wheel.