Patent ID: 9568121
Date: 2017-02-14
CPC Classifications: F16L,F42B

Claim:
1. A self-contained excavation-sensing module capable of being emplaced in the soil near an existing buried structure comprising: a hollow, tubular housing having two ends, a smoke generator with a pull-type igniter affixed within and at one end of said hollow, tubular housing, and a trigger that will activate said smoke generator when said hollow, tubular housing is disturbed broken by an external force; wherein said hollow, tubular housing has one or more circumferential scores which weaken said hollow, tubular housing such that said hollow, tubular housing will easily break upon application of external shear, tensile, or torsional force; and wherein said trigger comprises a wire within said hollow, tubular housing with said wire having two ends and with one end of said wire affixed to the other end of said hollow, tubular housing and the other end of said wire connected to the pull-type igniter of said smoke generator such that when said hollow, tubular housing is broken said wire will pull on said pull-type igniter and ignite said smoke generator.