Plug structure

A plug structure used for a container whose cap attachment screw of a container inlet port is an outer screw, configured to be attached to the container inlet port, comprising:

• a plug body to be press-fitted into the container inlet port being resiliently deformable in a radial direction at a lower portion thereof, the lower portion of the plug body being formed into a ring shape and being provided with slits in an axial direction;
• a flange portion with a lower surface formed to extend outward from an upper end portion of the plug body, wherein the lower surface is in contact with an upper end surface of the container inlet port;
• a locking claw provided on an outer peripheral surface of the lower portion of the plug body so as to project toward an inner wall surface of the container inlet port, the locking claw being set to have a minimum diameter at a lower end portion thereof which is substantially the same with or smaller than the inner diameter of the container inlet port and being set to have a maximum diameter of an upper end portion thereof which is larger than the inner diameter of the container inlet port and larger than an outer diameter of the plug body;
• a siphon tube connected to the plug body for taking out liquid in the interior of the container, wherein the siphon tube comprises an upper end inlet port;
• and
• a valve operating portion which presses a valve for discharging liquid provided on a socket which is connected to the plug body after having removed a cap from the container inlet port, wherein the valve operating portion is provided on the upper end inlet port of the siphon tube,
• wherein the plug body is fixed in the interior of the container inlet port by locking a shouldered portion of the locking claw on an enlarged portion of an inner wall surface of the container inlet port, the enlarged portion having a diameter greater than the inner diameter of the container inlet port, the shouldered portion being locked on the enlarged portion of the inner wall surface of the container inlet port by a force of the resiliently deformed locking claw in the direction of restoration toward an original shape of the locking claw.