(57) A mixer device suitable for mixing or disintegrating materials which, when subjected
to mixing or disintegration, give off noxious gases or infectious bacteria. The device
includes a mixer head comprising a rotor element and a stator element which is supported
below a lid for an open-topped mixing vessel. A rotor shaft extends upwardly from
the head and through an aperture in the lid. A seal is provided between the rotor
shaft and the lid and the lid is adapted for sealing engagement with the vessel. A
drive motor is mounted on a support with an output shaft thereof extending downwardly
towards the rotor shaft. Means are provided for releasably coupling the motor shaft
to the rotor shaft and cooperating locating means are provided on the lid and on the
motor support. The motor support is movable along a vertical guide and operating means
are provided for moving the support downwardly along the guide until the motor shaft
is coupled to the rotor shaft and the locating means on the support engage the locating
means on the lid.
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