Patent ID: 7121760

Claim:
An apparatus mounted on a leading vehicle to cause deflation of the tires of a trailing vehicle, comprising: a housing assembly mounted on a lower rear portion of said leading vehicle and defining a cavity therein, a drop plate forming a bottom of said housing being releasable from the rest of the housing; release means for releasing said plate from said housing to be deposited on a road surface substantially immediately in front of said trailing vehicle; a plurality of tire piercing spikes held by said plate, said drop plate having a frangible portion extending the length thereof and enclosing said plurality of spikes, stabilizing means within said frangible portion holding said plurality of spikes normal to the surface of said plate whereby, when a tire of said trailing vehicle crosses said frangible portion, it shatters allowing at least some of said spike to pierce said tire and releasing the remaining spikes to topple over into a harmless state, resilient means engaging the free ends os of said spikes whereby when at least one of said spikes is pulled by said tire the remaining spikes are pulled over to a harmless position.