PLASTIC CISTERN WITH INTEGRAL INTERNAL COMPARTMENTS - MANUFACTURE METHOD OF SAME

摘要

Subject: plastic cistern with integral internal compartments manufacture method of same. Constitution: a mould 1 composed of the upper and lower part 2, 3 and having the form of a hollow metal shell and a shape analogous to the cistern to be manufactured. The lower part 3 has one or several recesses 4 corresponding to the desired comportments of the cistern. The recesses 4 form in the interiorof the lower part 3 protuberances 5 of analogous shape and form. For the easy removal of the manufactured cistern from the mould, the lower part 3 has at its sides facing recesses 6 symmetrically extended even up to the upper part 2 and at a depth allowing their approach to the protuberances 5 without adjoining them. Manufacture method: rotary castingmethod.