Abstract: A household appliance for squeezing, comminuting or otherwise treating fruits and vegetables comprises a motor housing with a base having a lateral extensions from which a drive shaft extends upward. A cylindrical treatment vessel fits onto that extension with a hub which surrounds the drive shaft and accommodates a tubular stub shaft of an implement to be driven, the vessel having a cover which is attachable thereto through a bayonet coupling and carries a peripheral detent which must enter a slot of the motor housing and be engaged by a retractable latch to trip a microswitch enabling the motor to operate.