DEVICE FOR DRILLING CONJUGATE BORE-HOLES Russian patent published in 1999 - IPC

FIELD: mining industry. SUBSTANCE: device can be used in development of mineral deposits in conditions of appearing rock pressure and contoured arrangement of underground workings. Device comprises drilling string, striker with drilling bit and supporting bushes which are freely fastened on striker, guide sector having its axis deviated from striker axis at angle of 0.5-1.5 deg. , and rock breaker rigidly secured on front bush. Face of rock breaker is made at 15-25 deg. angle and is turned towards displacement of route of conjugate bore-hole due to rotation of drilling bit. Guide sector is provided with guiding pressing-off roller with ring. Sector is fortified by spring clamps. Application of aforesaid embodiment of device improves stability of operation in handling linear fissures. In addition, design of device is simplified. EFFECT: higher efficiency. 6 dwg