Patent ID: 7765932

Claim:
A shock tube initiator, comprising: a housing having a front portion, a rear, portion, and an internal compartment between the front and rear portion s; one or more grooves located within the internal compartment, the grooves leading into guide bores that pass through the front portion; two firing pins adapted to reciprocate in the grooves, each pin having a forward end that carries a front nose and a rearward end that carries a rear stub; the rear stub being adapted to locate and retain a compression spring for driving the firing pins forward; a first safety mechanism for preventing an inadvertent retraction of the pins against the compression spring; a cocking block located to the front of, and is adapted to retract, the firing pins; the cocking block receiving, and being retractable by, a cocking handle that passes through the block and a rear end of the housing; and a reciprocating firing plunger having a depressed position in which the plunger interferes with the firing pin, or a retracted position in which the plunger does not interfere with the firing pin.