Beverage container pierceable by a drinking straw

A container for beverages, comprising a body having an upper end wall at least part of which is pierceable by a drinking straw, wherein the improvements consist in:

• the body of the container having a frangible internal diaphragm which sub-divides the container into two superimposed chambers, one for containing a beverage and the other for containing an additive substance;
• a cutting tool being mounted in the body of the container above the diaphragm, the cutting tool having at least one cutting edge facing the diaphragm and being engageable by an end of the straw, in the first stage of the introduction of the straw into the body of the container, to cause piercing of the diaphragm due to the tool being driven by the straw, and
• the pierceable part of the container being provided with a nut of large pitch and the straw having a threaded portion with threading corresponding to the threading of the nut, whereby, after its engagement by the end of the straw, the cutting tool is rotated due to the axial sliding of the threaded portion of the straw in the nut, promoting the mixing of the beverage and the additive substance.