초록 ▼

Button inserts of a rock drilling bit are ground by positioning a grinding cup against each button insert and rotating the cup while supplying flushing fluid thereto. The flushing fluid is conducted through an axial bore of a spindle on which the grinding cup is mounted. An inner end of the spindle

Button inserts of a rock drilling bit are ground by positioning a grinding cup against each button insert and rotating the cup while supplying flushing fluid thereto. The flushing fluid is conducted through an axial bore of a spindle on which the grinding cup is mounted. An inner end of the spindle is mounted for rotation in a grinding head, and is rotated by a drive mechanism disposed within the grinding head. Flushing fluid is supplied to the axial bore through a flushing head mounted on the spindle at a location outside of the grinding head. The flushing head has axially spaced parts that are movable axially relative to one another under the force of flushing fluid passing therethrough, in order to establish a fluid seal.

대표청구항 ▼

[ I claim:] [1.] A method of grinding a button of a rock drilling bit, comprising the steps of:A) positioning a grinding surface of a grinding cup against said button;B) applying a rotary force to an inner end of a shaft structure disposed within a grinding head, to rotate said grinding cup which is

[ I claim:] [1.] A method of grinding a button of a rock drilling bit, comprising the steps of:A) positioning a grinding surface of a grinding cup against said button;B) applying a rotary force to an inner end of a shaft structure disposed within a grinding head, to rotate said grinding cup which is mounted on an outer portion of said shaft structure disposed outside of said grinding head; andC) introducing, during step B, a flushing medium to an inlet of an axial bore of said outer portion at a location disposed outside of said grinding head; andD) conducting said flushing fluid through said axial bore to said grinding surface for flushing said grinding surface.