COMBINED EXPANSION-FILL PLUG Russian patent published in 2009 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: in combined expansion-fill plug, including suspended plug, for instance in the form of slotted cylinder with no less thanc three long slots and conical extension of cavity downwards from bottom, in cavity of which from the bottom it is inserted expansion cone, connected to cable traction, according to invention, slotted cylinder and expansion cone are implemented from organic material, for instance cylinder from rubber-cord strip or plastic mixture, expansion cone - from wood or plastic mixture, and from above over expansion plug it is located fill part, for instance from chipping.

EFFECT: effectiveness increase of explosive crushing of rocks ensured by locking of detonation products in charging cavity up to moment of total destruction of surrounding rock of combined expansion-fill plug, composed from expansion suspended plug and filling part above it.

1 dwg