摘要:
A fluid-activated, percussive impact tool has a piston therein that reciprocates longitudinally but not rotationally. The piston activates a wrap spring clutch to rotate the drill steel. A removable splined nut in combination with the tool's housing restrains rotation of the piston, while permitting longitudinal reciprocation of the piston.
摘要:
Apparatus for drilling a bore hole comprising a hammer and a dual walled drill tube. The hammer comprises a reciprocable piston, fluid flow control device for directing fluid under pressure to the hammer to reciprocally drive the piston, and cutting device coupled to the hammer which rotate upon reciprocation of the hammer to cut the bore hole. Rachets are coupled to the cutting device to permit rotation of the cutting means in one direction only and to prevent rotation in an opposite direction. A portion of the fluid under pressure is diverted to entrain and direct particulate material to the surface of the bore hole.
摘要:
A rifle bar rotation mechanism for a pneumatic drill wherein remote control of rotation modes is accomplished by rotation of a cam element to control the engagement of pawl elements with a toothed ratchet member.