Medical or dental handpiece with a rear and a front shaft...

Details Medical or dental handpiece with a rear and a front shaft... Medical or dental handpiece with a rear and a front shaft...

2002-08-09

2008-08-26

Wilson, John J (Department: 3732)

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

C433S114000, C433S133000

Reexamination Certificate

active

07416410

ABSTRACT:
The invention relates to a medical or dental medical handpiece (3) having an elongate shaft (13), which has in its front end region a tool holder (5) having a lateral insertion opening (5a) for a tool (6), and having a rearward and a forward shaft section (13a, 13b) which include an obtuse angle (W2) which is open to the side away from the insertion opening (5a), wherein in the shaft sections (13a, 13b) there is rotatably mounted in each case a drive shaft section (53a, 53c), which stand in driving connection with one another by means of gears meshing with one another, and wherein the forward shaft section (13b) stands in driving connection with the tool holder (5) by means of gears (58, 59) meshing with one another. In order to improve handling, the angle (W3) include between the middle axis (16) of the insertion opening (5a) and the middle axis (13e) of the forward shaft section (13b) is greater than 90° and the forward gear (58) of the forward drive shaft section (53c) meshes on its side away from the insertion opening (5a) with the gear (59) of the tool holder (5).

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International Preliminary Examination Report in PCT/EP02/08932 dated Dec. 5, 2003.

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