Patent ID: 7140211

Claim:
A security system for detecting if an openable cover covering at least one hole in a wall of a tank trailer has been tampered with, said security system comprising: a locking member mountable to the tank trailer and movable between a locked position wherein said locking member blocks said cover from being opened, and an unlocked position wherein said locking member extends unobstructively away from said cover, said locking member comprising: a cantilever arm having an anchor end mountable to the tank trailer adjacent to the cover and a rotatable end rotatable around the anchor end, said cantilever arm being rotatable between the locked position where it extends over the cover and the unlocked position where it extends unobstructively away from the cover, said cantilever arm having a rotation path extendable in a plane generally in parallel with the wall of the tank trailer; a shaft adapted to project transversally from the tank trailer; and a tubular sleeve rotatably mounted around said shaft, the cantilever arm projecting radially from said sleeve; an actuating device mountable to the tank trailer and being operatively connected to the locking member in order to move said locking member between the locked position and the unlocked position; and a sealing mechanism capable of engaging the actuating device when the locking member is in the locked position in order to prevent movement thereof, said sealing mechanism comprising a breakable indicator which is broken upon disengaging the sealing mechanism from the actuating device, thereby indicating that the openable cover has been tampered with.