| 摘要 |
<p>A nozzle assembly (11) is externally threaded (25) for threaded engagement within an internally threaded (27) receptacle (14) formed in the drill bit (10). The nozzle assembly (11) includes a nozzle body (15) which is angularly indexable within a threaded sleeve structure (21, 22) to permit directional flow passage (16) to extend through the nozzle body (15) to be selectively oriented relative to the bit (10) when the nozzle assembly (11) is fully seated within the threaded (27) receptacle (14). Seating of the nozzle assembly (11) within the receptacle (14) anchors the nozzle body (15) against rotational and axial movement. The nozzle body (15) and the sleeve (21, 22) mechanically interlock to permit the nozzle body (15) to be positioned at selected different angular positions within the sleeve (21, 22) before seating the sleeve structure (21, 22) in the receptacle (14). The flow passage exit end (18) is surrounded by a drive area (32) that extends axially from the nozzle body (15). A drive tool engages the drive area (32) to rotate the nozzle assembly (11) into or out of the threaded (27) receptacle (14).</p> |
