Abstract: A direct-connect trailer tow interconnector for connecting the electrical circuits of a tow vehicle with similar circuits of a trailer in which a one-piece shell socket accepts a standard trailer plug at one end and is compatible with the fitting of a tow vehicle harness at the other end. Pass-through conductors, each of which is made from a single metal blank, form terminals compatible with those of the trailer plug and also with those of the vehicle harness fitting. A cover is provided with a spring-loaded floating hinge to permit flat sealing protecting the interconnector from environmental hazards, and a flushing passage is formed through the cover to remove debris from the floating hinge.

Abstract: A dual condition responsive switch is shown including first and second discs each having convex-concave surface configurations on opposite sides thereof adapted to invert its configuration upon being subjected to selected conditions. A motion transfer member extends from the second disc to an electric switch. At a first range of conditions the first disc prevents actuation of the switch, at a second range of conditions the curvature of the first disc has inverted allowing actuation of the switch while at a third range of conditions the curvature of the second disc has inverted resulting in deactuation of the switch.