Closure assembly comprising a cap with an integrated tamper-evident ring member

A closure assembly comprising an article and comprising a plastic cap provided with an integrated tamper-evident ring member, wherein:

• the article forms a tubular neck around a product passage in said article, said neck having a main axis and forming a mouth at a top end of said product passage,
• wherein the article further comprises a flange structure which comprises a flange portion that is integrally formed to the neck, which flange portion has a top face and a bottom face,
• the plastic cap provided with the integrated tamper-evident ring member is adapted to be secured or is secured on said neck of the article by means of an axial securing motion along the main axis,
• wherein the cap comprises a downward depending skirt, said skirt having an interior side, an exterior side, and a lower edge remote from a top wall structure, wherein the cap is adapted to seal the product passage in a closed position of the cap on said neck, and wherein the cap is adapted to be manually removed from the neck of the article by a user to open the product passage,
• wherein the tamper-evident ring member is integrally formed to the skirt of the cap and connected to said skirt via one or more breakable bridges,
• wherein the tamper-evident ring member comprises an annular ring member flange portion that has a bottom face, an inner face, and an outer face, wherein multiple hook members are integrally formed to the bottom of the ring member flange portion, the hook members being distributed in a circumferential direction of the ring member flange portion, wherein each hook member comprises a leg having an upper end integral with the ring member portion and protruding downward from the ring member flange portion, wherein each hook member comprises a hook portion at the lower free end of the leg,
• wherein the flange structure on the neck of the article is provided with multiple hook member passages that each extend between the top face and the bottom face through said flange portion thereof, each hook member passage being adapted to receive a hook member when the cap with the integrated tamper-evident ring member is axially mounted on the neck by means of said axial securing motion along the main axis, wherein the hook portion of each hook member engages underneath the bottom face of the flange portion on the neck of the article,
• and wherein the closure assembly is embodied such that upon first time opening of the closure assembly by removal of the cap by a user the one or more breakable bridges break and the tamper-evident ring member is retained on the article by means of the hook members,
• wherein the leg of at least one hook member has an inner bevel face at a lower end thereof, and wherein the neck is integrally formed with a corresponding bevel faced boss at a location below the corresponding hook member passage, such that upon axially mounting the cap with the integrated tamper-evident ring member on the neck by means of said axial securing motion along the main axis, the bevelled face of the boss contacts the inner bevel face of the leg and thereby assists in keeping the hook portion of the hook member engaged underneath the bottom face of the flange portion on the neck of the article.