Apparatus under subclasses 410.1+ in which the electric motor drives a pump of the type having an expansible and contractible pumping chamber, at least a portion of said pumping chamber being defined by a deformable wall which is formed either of flexible material or rigid members hinged or interfitted together so that the members are movable relative to each other; the flexing of the material or the relative movement of the members constituting the movement which effects the pumping function of the expansible and contractible chamber.
