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:
Jun. 02, 1992
Filed:
Jul. 03, 1991
Manfred Kempe, Neckargmund, DE;
Cambridge Instruments GmbH, Nussloch Bei Heidelberger, DE;
Abstract
A backlash-free drive for the infeed mechanism of a microtome, comprising a threaded spindle (1) mounted so as to be rotatable but axially non-shiftable, as well as two nut elements (2a, 2b) connected such that they are non-rotatable but can be shifted in an axial direction relative one another, said nut elements being spring-loaded against one another in an axial direction. Acceptable tolerances for the conicity of the threaded spindle are obtained by making use of at least one plain bearing (11,13;12,14) between the threaded spindle and nut element (2a), said nut element being connected to a specimen holder (16) via a gear. Fences (30,32;31,33) acting in the direction of spindle rotation protect the thread from deformation, as do two frictional clutches (24;25), which prevent excessive driving torques from having an effect and allow the user the option of operating the micrometer with manual feed (22) or an automatic feed device (26).