Patent ID: 8092763

Claim:
An apparatus for positioning a cuvette in an optical beam path of an optical measuring device, comprising: a housing, the housing including a shaft for axially receiving the cuvette and a recess, the shaft being defined by a plurality of wall surfaces in the housing; a fixed magnet disposed in the recess; a movable magnet magnetically connected with the fixed magnet, in a normally aligned position; a roller connected to the movable magnet, whereby when the cuvette axially moves in the shaft such that the roller moves the movable magnet laterally relative to the fixed magnet, the magnetic force between the fixed magnet and movable magnet, which urges the moveable magnet towards its normally aligned position, exerts a pressing force against the cuvette, so that the cuvette is pressed against at least one of the plurality of wall surfaces defining the shaft.