Self-restiance drum for containing pressurized fluid i.e. hot water, has rings provided with partial recess and positioning unit by tenon-slot system, where rings are joined together by connection unit

摘要

The drum (1) has an upper half-shell (2) and a lower half-shell (3) made of synthetic material, where the upper and lower half-shells are equipped with rings. The rings project toward exterior level of a free edge. The rings are provided with a partial recess and a positioning unit (6) by a tenon-slot system, where the partial recess is in a form of toric groove. The rings are joined together by a connection unit (4). The tenon-slot system is arranged in periphery of the rings.