Cap

A container assembly comprising a cap attached to a mouth of a double-walled container having a deformable inner container and a deformable outer container, the cap comprising:

• a main unit attached to the mouth of the double-walled container;
• a spout cylinder provided on the main unit;
• a lid that opens and closes a spout formed at a tip end of the spout cylinder;
• an inner stopper that is provided in the main unit so as to be fit into the mouth of the double-walled container;
• and
• a first inner valve retained in the main unit,
• wherein the inner stopper includes a communicating part that communicates with an inside of the inner container and an inside of the spout cylinder,
• the first inner valve includes a first valve body that covers the communicating part of the inner stopper;
• the first valve body has at least one passage hole,
• the first valve body is deformable to an opening position where the first valve body deforms into the spout cylinder in an opening direction and to a closing position where the first valve body retracts opposite to the opening direction, the first valve body being biased in a closing direction,
• the first valve body at the closing position acts as a partition between the communicating part of the inner stopper and the spout cylinder,
• the first valve body at the opening position causes the communicating part of the inner stopper and the spout cylinder to communicate with each other through the at least one passage hole of the first valve body, and
• the first valve body being deformed from the closing position toward the opening position keeps acting as a partition between the communicating part of the inner stopper and the spout cylinder,
• wherein the communicating part is an inner cylinder with one end communicating with the inside of the inner container and the other end communicating with the inside of the spout cylinder,
• the first valve body covers an opening of the inner cylinder,
• the first valve body is deformable to the closing position where the first valve body retracts concavely into the inner cylinder and to the opening position where the first valve body deforms convexly into the spout cylinder,
• the first valve body at the closing position acts as a partition between the inside of the inner cylinder and the inside of the spout cylinder,
• the first valve body at the opening position causes the inside of the inner cylinder and the inside of the spout cylinder to communicate with each other through the passage hole of the first valve body, and
• the first valve body being deformed from the closing position toward the opening position keeps acting as a partition between the inside of the inner cylinder and the inside of the spout cylinder, and
• wherein the first valve body has a protrusion that is circumferentially pressed to the end of the inner cylinder at the closing position,
• the passage hole is located outside the protrusion in a radial direction of the first valve body,
• the first valve body at the closing position presses the protrusion to the end of the inner cylinder so as to act as a partition between the inside of the inner cylinder and the inside of the spout cylinder,
• the first valve body at the opening position separates the protrusion from the end of the inner cylinder, causing the inside of the inner cylinder and the inside of the spout cylinder to communicate with each other through the passage holes of the first valve body, and
• the first valve body being deformed from the closing position toward the opening position presses the protrusion to the end of the inner cylinder so as to keep acting as a partition between the inside of the inner cylinder and the inside of the spout cylinder.

A container assembly comprising a cap attached to a mouth of a double-walled container having a deformable inner container and a deformable outer container, the cap comprising:

• a main unit attached to the mouth of the double-walled container;
• a spout cylinder provided on the main unit;
• a lid that opens and closes a spout formed at a tip end of the spout cylinder;
• an inner stopper that is provided in the main unit so as to be fit into the mouth of the double-walled container;
• and
• a first inner valve retained in the main unit,
• wherein the inner stopper includes a communicating part that communicates with an inside of the inner container and an inside of the spout cylinder,
• the first inner valve includes a first valve body that covers the communicating part of the inner stopper;
• the first valve body has at least one passage hole,
• the first valve body is deformable to an opening position where the first valve body deforms into the spout cylinder in an opening direction and to a closing position where the first valve body retracts opposite to the opening direction, the first valve body being biased in a closing direction,
• the first valve body at the closing position acts as a partition between the communicating part of the inner stopper and the spout cylinder,
• the first valve body at the opening position causes the communicating part of the inner stopper and the spout cylinder to communicate with each other through the at least one passage hole of the first valve body, and
• the first valve body being deformed from the closing position toward the opening position keeps acting as a partition between the communicating part of the inner stopper and the spout cylinder,
• wherein the main unit has an air inlet port that draws outside air into a clearance between the inner container and the outer container,
• the main unit contains a communication passage that communicates with the air inlet port and the clearance between the inner container and the outer container, and contains a second inner valve that opens and closes the air inlet port, and
• the second inner valve is integrated with the first inner valve, and
• wherein the air inlet port and the communication passage are formed at a point in a circumferential direction of the main unit,
• the second inner valve includes a support member that is fixed between the main unit and the inner stopper and a second valve body that is provided on the support member so as to be elastically deformed,
• the second valve body has a proximal end that is provided on the support member,
• when a pressure of the clearance between the inner container and the outer container exceeds an atmospheric pressure, a free end of the second valve body is pressed to an inner surface of the main unit so as to close the air inlet port, and
• when the pressure of the clearance between the inner container and the outer container falls below an atmospheric pressure, the free end of the second valve body separates from the inner surface of the main unit so as to open the air inlet port.