20120182139 | FIFTH WHEEL ALARM SYSTEM - An alarm system for an articulated vehicle includes a first part adapted to attach to a vehicular hitch member, and a second part adapted to attach to a trailering hitch member. The first part includes a conductive post extending vertically between first and second electrical contacts. The post and the first and second electrical contacts form parts of an alarm circuit. The second part includes first and a second arms horizontally extending towards the post in a common plane at an angle with respect to each other. When attached, the first and second parts are disposed so that the first arm moves the post into contact with the first electrical contact as the articulated vehicle turns in a first direction, and so that the second arm moves the post into contact with the second electrical contact as the articulated vehicle turns in a second direction opposite the first direction. | 07-19-2012 |