(57) A mixer having a rotary drum (12) which comprises a flexible member (21), an inner
rotor (36) with outstanding blades thereon, the flexible member (21 the inner rotor
(36), and its blades all being of elastomeric material, the inner diameter of the
flexible member (21) being greater than the envelope diameter of the rotor blades
(39), the mixer rotor (36) being positionable within the flexible member (21) with
which its blades (38,39) co-operate in the mixing of concrete, but being withdrawable
therefrom for cleaning and maintenance purposes.
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