Patent ID: 7404466

Claim:
A locking pin locator for positioning a semi truck having a tractor and a trailer over a tandem axle under the trailer, the trailer and tandem axle being slidably connected to each other by matching pairs of slide rails which can be locked together in several positions by pins extending through holes in the tandem axle slide rails into holes in the trailer slide rails, the locator comprising: a pressure sensitive switch; a pipe having a threaded end and an unthreaded end; a magnetized mounting bracket having a threaded hole into which the threaded end of the pipe can be screwed; an electric cable; a battery; and, a signal; wherein the switch is affixed to the inside of the pipe and extends just outside the threaded end of the pipe; the pipe is screwed into the hole in the bracket; the bracket is adapted to attach to a trailer slide rail and extend the switch into a hole in the slide rail of the trailer far enough to turn the switch on when contacted with a reinforcement plate surrounding a locking pin hole in the tandem axle rail; the switch, when turned on, completes a circuit including the cable, the battery and the signal; the signal is adapted for signaling a driver sitting in the tractor when the switch is turned on or off.