The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 1980
Filed:
Nov. 21, 1978
Hermann Landgraf, Heppenheim, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A drive section for a dental handpiece having a housing with means for connection to a supply hose and means for connection to a grip section of the handpiece, the housing receiving a drive motor having a stator surrounding a rotor and at least one coolant line section extending therethrough in a direction parallel to the axis of the drive section, characterized by the stator consisting of a hard metallic material with at least one section of soft metallic material, each section being a portion of the circumference of the stator and extending the length thereof, and each section having a means for receiving a portion of the coolant line. Preferably, the stator has a cylindrical configuration in which the sections form a segment of the cylindrical configuration and are provided with a longitudinally extending bore which forms a portion of the coolant line. If the drive motor is an electrical motor, the stator has a pair of half shells of a permanent magnetic material which are separated by a pair of sections which are of soft magnetic material and act as intermediate yokes.