PARK, JONG KWEON,박종권,LEE, SUNG CHEUL,이성철,KIM, BYUNG SUB,김병섭,RO, SEUNG KOOK,노승국,CHOI, SOO CHANG,최수창,PARK, JONG KWEONKR,LEE, SUNG CHEULKR,KIM, BYUNG SUBKR,RO, SEUNG KOOKKR,CHOI, SOO CHANGKR
申请号：
KR1020140089649
公开号：
KR1015764560000B1
申请日:
2014.07.16
申请国别(地区):
KR
年份:
2015
代理人:
摘要：
Disclosed is a tool gripping device of a handpiece including: a hollow spindle which is joined on a center axis in a head unit to be rotated by a bearing； and a tool holder which is arranged in the spindle, is joined and installed to be rotated with the spindle, and holds a tool. The tool holder includes: a holder body comprising a clamping unit and a reinforcing unit, wherein the clamping unit has a bore for allowing a shank part of the tool to be inserted therein, a plurality of axial direction slits, which are formed in a circumferential direction on an outer circumferential side and communicate with the bore, and a male screw thread formed on a front end portion of the outer circumferential side and the reinforcing unit which is integrated into a back side of the clamping unit, has an outer circumferential side in an outer circumferential direction shape of one from a taper, a two-dimensional curve line, and a perpendicular line, and has an outer diameter larger than an outer diameter of the clamping unit； a shape memory ring which clamps or unclamps the clamping unit in a radial direction of an axial line as the shape memory alloy ring is heated or cooled while being inserted in the slit in the clamping unit and is exposed to the outside of the spindle； a spacer which is interposed between the reinforcing unit and the shape memory alloy ring； and a locking cap which prevents the shape memory alloy ring from escaping as the locking cap is screw-joined to a male screw unit of the clamping unit by a screw tab formed on an inner circumferential side.핸드피스의 공구 파지장치가 개시되어 있다.개시된 핸드피스의 공구 파지장치는, 헤드부 내의 중심축 상에 베어링에 의해 회전되게 결합되는 중공의 스핀들； 상기 스핀들의 내부에, 스핀들과 함께 회전되게 결합 설치되어 공구를 파지하는 공구홀더를 갖는 핸드피스의 공구 파지장치로서,상기 공구홀더는, 내부에 공구의 생크부가 삽입되는 보어가 형성되고, 외주면 상에는 상기 보어와 연통되는 다수의 축방향 슬릿이 원주방향으로 형성되며, 외주면의 선단부에는 숫나사산이 형성된 클램핑부； 상기 클램핑부의 후방에 일체로 형성되되, 외주면의 축방향 형태가 테이퍼, 2차원 곡선, 수직선 형태 중 어느 하나의 형태를 이루고 있으며, 상기 클램핑부의 외경에 비해 큰 외경을 갖는 보강부；로 이루어진 홀더몸체； 상기 클램핑부의 슬릿 상에 끼워진 채 가열 또는 냉각에 의해 클램핑
