Liquid agitation apparatus for an absorbance measuring apparatus

Claim 1

A liquid agitation apparatus for an absorbance measuring apparatus, comprising: at least one transparent reaction vessel for containing a reaction solution to be examined; a holder for removably containing one said vessel for agitating said reaction solution contained in said one vessel for photometry, said holder being formed with opposing photometric openings for allowing a photometric radiation flux to pass through said reaction solution contained in said one vessel; a thermostat block having means for receiving said holder, said thermostat block including means for heating said vessel; means for vibrating said holder in order to agitate said reaction solution in said one vessel, said vibrating means being connected to said holder via a resilient joint and said holder further comprising a support shaft connected to said resilient joint; and means for positioning said holder so that when said holder is not being vibrated, its photometric openings have a set alignment, said positioning means comprising: a positioning member rigidly connected to said support shaft; a stationary lug for blocking rotary motion of said positioning member past a set position corresponding to said set alignment of said holder; and means for biasing said positioning member against said stationary lug when said holder is not being vibrated.