GEAR FOR FEED OF SPRINKLING FLUID TO BORING BIT OF MINING MACHINE Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: gear for feed of sprinkling fluid to boring bit of mining machine has bit holder, boring bit with cylindrical box, annular duct for passing of sprinkling fluid, stopping element, shut-off fixture with bearing ring and resilient sealing element and duct for feed of sprinkling fluid. Bit holder is attached to body of actuating tool and has through longitudinal duct and bearing surface. Boring bit is mounted in longitudinal duct of bit holder for turning and limited axial movement. Stopping element and bearing ring are placed in annular groove in shank part of box. Shut-off fixture has insert with V-shaped ducts, annular groove and bevels. Insert is installed for limited axial movement and interaction with its side bearing surfaces with face surface of box and with bearing surface of body of actuating tool. Sealing element is located in annular groove in shank part of box. Stopping element is made fast to bit holder and is mounted for interaction with bearing ring and side wall of annular groove in shank part of box. Duct for feed of sprinkling fluid through V-shaped ducts in insert communicates with space formed with walls of longitudinal duct in bit holder, surfaces of bevels in insert, shank part of box and sealing element. EFFECT: improved operational characteristics, increased reliability. 3 cl, 5 dwg