Patent ID: 6692202
Filing Date: 2004-02-17
Classification: B23Q,F16J,Y10T

Abstract:
A spindle protective structure in a spindle-through coolant feeder for feeding coolant to a distal end of a spindle driven by a spindle motor, comprising:a jointing device for feeding coolant into a through hole formed axially in the spindle or through holes formed axially in the spindle and a shaft connected to the spindle; a housing for supporting said jointing device; a drain pipe for discharging coolant overflowed in said housing from said jointing device; and a seal member having an elastic lip arranged around a circumferential surface of a portion of the spindle or the shaft projected in said housing with a small gap therebetween to be elastically deformed and pressed against the circumferential surface by pressure of coolant excessively overflowed in said housing, to thereby seal the circumferential surface and prevent an excessive leakage of coolant through the gap.