Twist-cut unsealing mechanism for container

A twist-cut unsealing structure for a container:

• wherein the container includes a spout mounted on a pouring unit of the container and a cap detachably mounted on said spout, and the container is unsealed by twist-cutting a sealing member sealing a liquid passage of said spout by rotation of said cap around a rotation center line;
• said spout includes said liquid passage in a tubular body, said liquid passage communicating with an inside of said container at a base portion of said tubular body, and an unsealing expression mechanism having said sealing member to be twist-cut and coupling the body of said spout;
• said cap includes a tubular wall forming a tubular vacancy and having an open lower end, at least an upper portion of said body of said spout is capable of concentrically fitted in said cap;
• said twist-cut unsealing expression mechanism includes a both-side protrusion disposed along a virtual circle around said rotation center line and an abutment protrusion capable of relative motion along said virtual circle, and one of said both-side protrusion and said abutment protrusion is fixed to said spout and the other protrusion is fixed to said cap;
• said both-side protrusion includes a gentle sliding surface and a steep stopper surface both having generally the same protrusion height in a radial direction and disposed side by side in opposite directions along said circle;
• said abutment protrusion is capable of abutting against the sliding surface and the stopper surface;
• at a position where said abutment protrusion passes said sliding surface in a rotation direction, a relative rotation position of said spout and said cap passes a twist-cut completion position completing twist-cut of said sealing member and is at a separation permission position of permitting separation of said cap:
• the twist-cut unsealing structure for a container includes a rotation transmission unit capable of abutting against said sealing member of said spout in an upper portion of said tubular vacancy, and a sealing member holding portion capable of accommodating and holding said sealing member of said spout in the upper portion of said tubular vacancy.