Obturating device for tubes, flasks and other containers, the opening and closing of which are controlled through rotation

An obturating device for a tube, flask and like container having a neck with an inner edge and an outlet passage, wherein the obturating device comprises

• a valve-cap and a casing;
• said valve-cap having a plate provided with an upper part;
• a secondary component protruding at said upper part;
• a set of maintaining blades protruding in middle of the outlet passage of the container in order to maintain in place said secondary component;
• a fitting skirt for said neck, with said fitting skirt downwardly extending said plate of said valve-cap and comprising an outer periphery;
• said valve-cap further having an inner cylindrical tightness skirt and a second tightness skirt, with said second tightness skirt being slightly tapered downwardly and applied against said inner edge of said neck;
• said casing comprising a substantially plane upper plate having a central hole and an outer fitting skirt comprising an inner periphery;
• said outer periphery of the fitting skirt of said valve-cap and said inner periphery of the outer fitting skirt of said casing having a complementary notch-ramp structure for an alternate reciprocating engagement and disengagement of said secondary component of said valve-cap into and from said hole of said substantially plane upper plate of said casing;
• said casing having an inner part provided with a tightness skirt, said tightness skirt being slightly tapered downwardly and applied against said inner cylindrical tightness skirt of said valve-cap;
• said upper part of the valve-cap being further provided with first fin means cooperating with second fin means mounted in the casing to prevent any rotation of the casing during transportation of the container, whereby opening and closing of the device are respectively made by a positive rotation of the casing in one and another direction with a suitable tightness in rotation being provided by said tightness skirts.