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1.发明授权公开(公告)号：US09743998B2
公开(公告)日：2017-08-29
申请号：US14431438
申请日：2013-09-30
Applicant: DENTSPLY SIRONA Inc.
Inventor： Thomas Bierbaum , Adelbert Lauffer
Abstract: The invention relates to a dental preparation instrument that includes a tool that rotates in an alternately reversible manner. The preparation instrument has a drive for the tool. The drive provides a continuous fully rotational motion, and a gearing is arranged before the tool. Said gearing converts the continuous fully rotational motion of the drive into an alternately reversing rotational motion, which is continuous as viewed over several reversals.
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公开(公告)号：US10736713B2
公开(公告)日：2020-08-11
申请号：US16016056
申请日：2018-06-22
Applicant: DENTSPLY SIRONA Inc.
Inventor： Thomas Bierbaum , Matthias Rein , Ralf Sutter , Siegfried Goisser
IPC: A61C1/18 , F16C33/58 , F16C33/76 , F16C25/08 , F16C33/78 , F16C37/00 , F16C35/04 , F16C19/06 , F16C19/54 , A61C1/08 , A61C1/00 , A61C1/05
Abstract: A dental handpiece (1) having a drive (3) of a tool (4), which drive is located in a head housing (2), has at least one media-conducting line arranged in the head housing, which media-conducting line has an outlet opening to the tool, and a tool receptacle (16) arranged in a drive chamber, which tool receptacle is rotatably supported by means of a rolling bearing (11) in a support (14) of the head housing (2) on a side of the drive chamber facing the tool. The rolling bearing has an outer race (13), which is supported against the head housing (2) radially in the support (14) in the area of a raceway (22) and which has a sub-area (21), the outside diameter D2 of which is reduced compared to the outside diameter D1 in the area of the raceway (22). The head housing has a housing projection (23), which extends into the area of the reduced outside diameter D2, and the media-conducting line (17) runs at least partially through said housing projection (23).
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