Multi-chamber receptacle

Claim 1

A multi-chamber receptacle for initially storing and subsequently mixing at least one pulverulent ingredient and one liquid or pasty material for making a product such as a dental preparation ready for use, said ingredient and material being capable of reacting with each other; comprising a container forming a main chamber for initially storing said pulverulent ingredient and for subsequently mixing it with said material; composite casing means insertable in said main chamber at one end thereof and forming at least one additional chamber for initial storage of said material; a first component of said casing means in the shape of an inner sleeve-like member constructed to resist said material during said storage thereof; a bottom provided on said inner member and arranged to separate said main and additional chambers from each other during said initial storage, said bottom having a relatively thin, frangible portion; a second component of said casing means in the shape of a jacket substantially surrounding said inner member and having a perforation aligned with said frangible portion; piston means resistant to said material and movable within said inner member in sealing relationship therewith, said piston means having a closed end facing said bottom and being initially spaced therefrom in a manner such that, through movement of said piston means towards said bottom, said material will be caused to rupture said frangible portion and then enter said main chamber for admixture to said pulverulent ingredient; and releasable closure means at the other end of said main chamber.