Backlash-free drive for the infeed mechanism of a microtome

Details Backlash-free drive for the infeed mechanism of a microtome Backlash-free drive for the infeed mechanism of a microtome

1991-07-03

1992-06-02

Herrmann, Allan D.

Machine element or mechanism

Gearing

Rotary bodies

F16H 5518

Patent

active

051177064

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).

REFERENCES:
patent: 525780 (1894-09-01), Boynton
patent: 2328732 (1943-09-01), McKinney
patent: 2345194 (1944-03-01), Granberg et al.
patent: 2690682 (1954-10-01), Passmann
patent: 2919596 (1960-01-01), Kuehl
patent: 3001414 (1961-09-01), Bourne
patent: 3703835 (1972-11-01), O'Conner et al.
patent: 4114470 (1978-09-01), Sharpe
patent: 4625608 (1986-12-01), Behme et al.

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