Closure assembly and container provided with such a closure assembly

A closure assembly comprising:

• an article forming a tubular neck and having a product passage extending through said neck, said neck having a vertical axis and forming a mouth at a top end of said product passage, said neck having an interior side and an exterior side,
• a rotational cap having a unitary cap body that is injection molded of plastic material, the cap to be secured on said neck of the article, the cap sealing the product passage in a closed position of the cap on said neck, wherein for removal of the cap from the neck of the article by a user to open the product passage the cap is adapted to be manually rotated from the closed position in an opening direction,
• wherein the unitary cap body comprises an annular top wall having an inner perimeter and an outer perimeter, a downward depending skirt integral with said outer perimeter, and a hollow pin portion downward depending from said inner perimeter and having a circumferential face extending along a length thereof as well as a closed pin bottom,
• wherein the circumferential face of the hollow pin portion and the article have at least one pair of cooperating sealing surfaces such that the hollow pin portion, in the closed position of the cap, closes the product passage,
• wherein said skirt of the cap body has an interior side and an exterior side,
• wherein the cap furthermore comprises an integrally molded tamper-evident structure at a bottom end of the skirt which is adapted to evidence a first time opening of the cap,
• wherein said hollow pin portion extends from the annular top wall downward at least to a level of the tamper-evident structure,
• wherein the cap is a quarter-turn cap, wherein the neck is provided with two integrally molded and diametrically opposed, outwardly protruding retention members for the cap, wherein the skirt of the cap is provided, in a region above the tamper-evident structure, with two diametrically opposed windows that each extend through the skirt, each window being embodied to receive one of said retention members therein so as to axially retain the cap on the neck,
• wherein the skirt of the cap has, at a level of said windows, a pair of diametrically opposed enlarged inner space portions each delimiting an inner space such that, upon a quarter turn rotation of the cap in said opening direction by the user, the enlarged inner space portions align with the retention members as the retention members each move out of the respective window,
• wherein a bottom end of the skirt has a pair of diametrically opposed static cover portions separated from one another by a pair of diametrically opposed and open bottomed notches in said skirt, each of said static cover portions forming a sector of a lower edge of the skirt and having a leading rim and a trailing rim, seen in the opening direction of the cap,
• wherein each notch is defined by an upper notch rim and by the trailing rim of one of the static cover portions and the leading rim of the other of the static cover portions,
• wherein in each of said notch an indicator segment of the tamper-evident structure is located, which is integrally molded to said upper notch rim by a non-frangible hinge, wherein the indicator segments are integrally molded to each of said leading rim and said trailing rim via at least one respective frangible bridge,
• wherein the indicator segments have an inner face, and wherein the exterior side of the neck has for the indicator segments an integrally molded boss, said boss being engageable with the inner face of said indicator segment,
• and wherein the bosses are adapted to engage on said inner face of a respective indicator segment such that, upon the first time opening of the cap by the quarter turn rotation in said opening direction, the indicator segments are each forced outwardly by the respective boss such that each of said indicator segments pivots about said non-frangible hinge and said frangible bridges break, thereby said outwardly pivoted indicator segments and said broken frangible bridges evidencing the first time opening of the cap.