Constant temperature, multiple sample, rotary changer

Details Constant temperature, multiple sample, rotary changer Constant temperature, multiple sample, rotary changer

1976-05-19

1977-09-13

McGraw, Vincent P.

Optics: measuring and testing

Sample, specimen, or standard holder or support

250576, G01N 2116

Patent

active

040478203

ABSTRACT:
A rotary sample changer for a spectrofluorometer has a revolving turret base which can be indexed and which carries an interchangeable sample carrier. Different sample carriers accommodate test cells, test tubes and cuvettes of different sizes and shapes.
The revolving turret base and the interchangeable rotary sample carriers are constructed of material having good thermal conductivity and rotate on a large stationary hollow axle which is thermostated by thermally controlled internal fluid circulation to act as a heat source or sink to the samples. Thus, the sample carriers can readily be interchanged without disturbing the plumbing by which the thermostatic fluid is circulated.
The revolving turret base is detented at the stations to which it is indexed without kinematic ambiguity and without application of any cocking force. Two spring biased ball detents, symmetrically spaced 180.degree. about the axis of rotation, are provided. At the four index stations one ball catches on one of two indexing grooves spaced 90.degree. apart, while the other ball bears against a flat.

REFERENCES:
patent: 3551062 (1970-12-01), Brown
patent: 3806259 (1974-04-01), Boostrom et al.

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