Abstract: A canned motor pump wherein the can has two coaxial tubular walls defining an annular space for the flow of a heat exchange fluid which heats or cools the can. If the can has an end wall, the latter can be formed with an additional space which communicates with the annular space. The driven rotor within the can can be rotated by a stator which surrounds the can or by a hollow rotor which rotates the driven rotor by way of one or more magnets. The can can be heated by an electric heater.

Abstract: A canned motor pump wherein the can has at least two coaxial tubular walls defining an annular space for the flow of a preferably gaseous fluid which is used to facilitate detection of leaks in the walls of the can. Each tubular wall can individually seal the driving unit from the driven unit of the pump motor. The leak detector can generate visible, audible and/or otherwise detectable signals, and such signals can also serve to stop the motor in the event of leakage.

Abstract: A method and apparatus for combined injection moulding and blow forming of containers or objects of plastics material. A preform is formed on a mandrel by injection moulding. The mandrel with the preform is transferred from the injection mould to a blow forming mould and the preform is blow formed to the final product. It is characteristic of the invention that the preforms are formed in the injection mould and extracted from the injection mould at a higher rate than their forming in the blow forming mould, two or more preforms being simultaneously blow formed in two or more blow forming moulds. This arrangement has the advantage of providing complete independence of the two production cycles. The apparatus includes a conveyor for the mandrels carrying the preforms, this conveyor extending from an injection mould to a blow forming mould.