Patent ID: 8763723

Claim:
A cartridge for breaking rock which includes a tubular housing in which is formed a first compartment, a first energetic composition inside the first compartment, a primer which is exposed to the first energetic composition, a second compartment inside the tubular component, a plunger inside the tubular component which is movable under explosive force towards the primer, a second energetic composition inside the second compartment, an actuator and a fuse for initiating the second energetic composition, wherein the actuator has an area which is smaller than the cross-sectional area of the plunger and is movable, by movement of the plunger, towards the primer, whereby a quantity of liquid is trapped by the actuator and the primer in a volume between the actuator and the primer, and wherein the primer is initiated by force transmitted from the actuator through the confined liquid in said volume to the primer.