JP2016023792A - cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cock in which a loss of a cover body is eliminated and it can be fixed to prevent the inner cylinder from being turned under a closed state only through a simple operation or assembling operation also after starting the use thereof.SOLUTION: This invention comprises: an outer cylinder body 2 having both ends opened; an inner cylinder 5 having an opened extremity end and rotatably fitted to an inside part of the outer cylinder body in a circumferential direction; a handle 6 provided at a base end side of the cylinder body and constituted to be changed-over to any one of an opened state in which an outer communicating hole and an inner communication hole are communicated to each other or a closed state in which the outer communicating hole and the inner communication hole are not communicated to each other; a cover body 3 fixed not to be turned substantially in a circumferential direction with respect to the outer cylinder so as to removably close the extremity end opening of the inner cylinder; and an engaging structure 7 formed between the extremity end of the inner cylinder and the cover body and formed to cause the inner cylinder and the cover body under the closed state to be engaged with each other in a circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cock attached to a liquid storage container and configured to be able to switch between an open state and a closed state by operating a handle.

  As shown in Patent Documents 1 and 2, a liquid storage container such as a container formed of plastic or PET or an inner bag of a bag-in-box is provided with a cock that can be switched between open and closed states by turning a handle. May be.

  The cock is provided on the base end side of the inner cylinder, an outer cylinder that is attached to the liquid storage container, an inner cylinder that is rotatably fitted in the circumferential direction with respect to the outer cylinder. And a handle for rotating the inner cylinder relative to the outer cylinder. An outer communication hole communicating with the liquid storage container passes through the side surface of the outer cylinder, and an inner communication hole penetrates the side surface of the inner cylinder. Then, when the inner cylinder is rotated by the handle to open the outer communication hole and the inner communication hole, the liquid in the liquid storage container is poured from the front end of the inner cylinder to the outside. Can be put out. Further, in the closed state in which the outer communication hole and the inner communication hole are not communicated and the outer communication hole is closed on the side surface of the inner cylinder, the liquid can be prevented from flowing out from the liquid storage container. .

  By the way, in such a cock, if the handle moves unintentionally, for example, when the handle hits something, the inner cylinder body may rotate to change from the closed state to the open state, and the liquid may leak.

  In order to solve such a problem, the cock of Patent Document 1 is provided with a stopper for fixing the handle in the closed position.

  On the other hand, in the cock of Patent Document 2, a connecting body that is easily separated and disposed between the tip of the outer cylinder and the lid that is placed on the tip of the inner cylinder is provided. An uneven structure that engages between the inner surface and the outer surface of the inner cylinder is formed. In the initial state where the cock is attached to the liquid storage container or when the product is shipped, the inner cylindrical body is fixed in a direction in which the cock is closed by the concavo-convex structure so as not to rotate in the circumferential direction. In addition, when the liquid is poured out from the liquid storage container, the connecting body is torn off and discarded, and the inner cylinder body is detached and can be freely rotated in the circumferential direction.

  However, in the cock shown in Patent Document 1, in order to fix the handle and keep the closed state, a member that is difficult to be integrally molded with the other member called a stopper is required, and the number of parts increases. In addition, since the handle is merely fixed so as not to rotate, it can be fixed even if the handle is in the open position, for example, and the liquid can be surely leaked from the liquid storage container to the outside. I can't say I can prevent it. In addition, since it is necessary to insert the stopper into the handle while pushing the stopper while slightly deforming it, it is not so easy to fix the inner cylinder in the closed position.

  On the other hand, in the cock described in Patent Document 2, if the connecting body is torn off, the inner cylinder cannot be fixed so as not to rotate thereafter. Moreover, since the said cover body will be cut | disconnected from the said outer cylinder body if the said connection body is torn off, when pouring out a liquid, it is necessary to put the said cover body in another place. Accordingly, when the lid is to be attached to the opening of the inner cylinder, the lid may be lost.

Japanese Patent No. 3514872 Japanese Patent No. 3439982

  The present invention has been made with the intention of solving the above-described problems all at once, and eliminates the loss of the lid, and after the start of use, the inner cylinder is closed in a closed state with only simple operation and assembly. It aims at providing the cock which can be fixed so that rotation of a body may not arise.

  That is, the cock according to the present invention has an outer cylindrical body that is open at both ends, an outer communication hole that is formed through the side surface of the outer cylindrical body, and that communicates with the inside of the liquid storage container. An inner cylinder fitted into the outer cylinder so as to be rotatable in a circumferential direction, an inner communication hole formed through a side surface of the inner cylinder, and the inner cylinder Provided at the base end, the inner cylinder is rotated in the circumferential direction so that the outer communication hole and the inner communication hole communicate with each other, or the outer communication hole and the inner communication hole communicate with each other. A handle configured to be switchable to any one of the closed states, and fixed to the outer cylinder so as not to rotate substantially in the circumferential direction, and the distal end opening of the inner cylinder A lid that is configured to be detachably closed, and a shape between the tip of the inner cylinder and the lid Are characterized by having a an engagement structure formed to engage the inner cylindrical body and said lid relative to said circumferential direction in the closed state.

  If it is such, it is comprised by the said engagement structure so that the said inner cylinder and the said cover body may be engaged with respect to the said circumferential direction in the said closed state, Furthermore, the said cover body is the said Since it is fixed so as not to rotate substantially in the circumferential direction with respect to the outer cylinder, the inner cylinder is fixed so as not to rotate in the circumferential direction by the lid in the closed state. can do.

  Therefore, even if something hits the handle in the closed state, the inner cylinder does not rotate in the circumferential direction until the inner cylinder is in the open state, and the liquid is unexpectedly moved from the inside of the liquid storage container to the outside. Leakage can be surely prevented.

  Further, since the engagement structure is provided between the inner cylinder body and the lid body, the inner cylinder body can be repeated any number of times only by closing the front end opening of the inner cylinder body by the lid body. The fixed function can be realized.

  Further, since the lid is fixed to the outer cylinder, the lid is lost without being separated from the outer cylinder even when it is removed from the inner cylinder to pour out liquid. There is no end to it.

  In order to ensure that the lid body is in the closed state when the front end opening of the inner cylinder body is closed by the lid body, the engagement structure is such that the lid body is only in the closed state. What is necessary is just to be comprised so that closing of the front-end | tip opening of this may be permitted. With such a configuration, it is possible to reliably prevent an operation error such as fixing the rotation of the inner cylindrical body while mistaking the direction of the handle and mistaking the open state and the closed state.

  In order to prevent rotation of the inner cylinder body in a closed state with a simple structure, the engagement structure includes a movable engagement surface formed at a distal end portion of the inner cylinder body, and the lid What is necessary is just to be comprised from the fixed engagement surface provided inside the body.

  In order to allow the lid body to easily close the distal end opening of the inner cylinder while providing the engagement structure, the movable engagement surface is in the closed state, the distal end of the inner cylinder. The fixed engagement surface is formed on a movable protrusion protruding from the lid body side, and the lid body is formed on the outer cylinder body in a state where the lid body closes the inner cylinder body or the outer cylinder body. What is necessary is just to be formed in the fixed protrusion protruded from the inner surface of the said cover body so that it may be located in the opposite side to the side currently fixed. If it is such, since the arrangement | positioning place of the said movable engagement surface and the said fixed engagement surface can be released | separated in a closed state, the said inner cylinder body by the said engagement structure in the middle of covering with the said cover body And the lid can hardly interfere with each other.

  In order to allow the lid of the inner cylindrical body to be easily covered with the lid, while fixing the lid so as not to rotate substantially with respect to the circumferential direction, the lid It is only necessary that the body is configured so as not to substantially rotate in the circumferential direction by a hinge provided between the lid body and the distal end portion of the outer cylinder body.

  In order to easily attach the cock to the liquid storage container, the outer cylinder is provided so as to surround the outer communication hole on the outer surface of the outer cylinder, and is attached to the liquid storage container. Any device that further includes a mouth plug may be used.

  In order to reduce the number of parts constituting the cock and to reduce the number of assembly steps as much as possible, the outer cylinder and the lid are integrally molded with resin, and the inner cylinder and the handle are molded with integral resin. Just do it.

  As described above, according to the cock of the present invention, the lid is fixed so as not to rotate with respect to the circumferential direction with respect to the outer cylinder, and the tip of the inner cylinder and the Since the engagement structure formed between the lid and the lid is configured to be engaged in the circumferential direction, the inner end of the inner cylinder is simply covered with the lid. The cylindrical body can be fixed so as not to rotate in the circumferential direction. Therefore, the fixing in the closed state can be repeatedly performed using the lid. Further, since the lid body is fixed by the outer cylinder body, the lid body is not separated from the outer cylinder body and is not lost even when the front end opening of the inner cylinder body is not closed.

The typical perspective view showing the cock in the open state concerning one embodiment of the present invention. The typical perspective view which shows the cock in the closed state in the embodiment. The schematic diagram which shows the cock in the open state in the embodiment. The schematic diagram which shows the cock in the closed state in the embodiment. The other schematic diagram which shows the cock in the open state in the embodiment. The schematic diagram shown about the cock which concerns on another embodiment. The schematic diagram shown about the cock which concerns on another embodiment.

  A cock 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  The cock 100 of this embodiment is attached to a liquid storage container C such as a container C formed of plastic or PET, or an inner bag of a bag-in-box, and can be opened and closed with respect to the liquid storage container C. This is to add a function as a proper outlet.

  As shown in FIGS. 1 and 2, the cock 100 according to the present embodiment is assembled to the liquid storage container C so as to communicate with the inside of the liquid storage container C, and to be rotatable with respect to the body MB. And an operation unit OP. An engagement structure 7 is formed between the main body MB and the operation portion OP to fix the operation portion OP so as not to rotate in the circumferential direction.

  The main body MB includes a plug 1 formed in a substantially thick cylindrical shape attached to the liquid storage container C, an outer cylinder 2 provided so as to be orthogonal to the axial direction of the plug 1, And a lid 3 for opening and closing the tip opening of the operation portion OP.

  Both ends of the outer cylinder 2 are open as shown in the cross-sectional views of FIGS. 3 to 5, and an outer communication hole 21 communicating with the inside of the liquid storage container C is passed through the center of the side surface. Formed. The upper portion of the plug 1 is connected so as to surround the outer communication hole 21.

  The lid 3 is connected by a hinge 4 provided at the top of the distal end opening of the outer cylinder 2, and when the lid of the outer cylinder 2 is not covered, FIG. And the state which bounced up as shown in FIG. 3 etc. is maintained. For this reason, the lid 3 does not get in the way when the liquid inside the liquid storage container C is poured out from the front end opening of the inner cylinder 5 and is easy to use. The lid 3 is fixed to the outer cylinder 2 by the hinge 4 so that it does not substantially deform or rotate in the circumferential direction of the outer cylinder 2. On the other hand, the hinge 4 is bent around a radial axis, and the lid 3 is configured to be able to close the front end opening of the outer cylindrical body 2 as shown in FIGS. On the inner side of the top surface of the lid 3, a fixed projection 31 and a fixed engagement surface 32 that are part of the engagement structure 7 are formed.

  As shown in FIG. 1 and the like, the operation portion OP includes an inner cylinder 5 that is fitted inside the outer cylinder 2, and a handle 6 that is provided on the proximal end side of the inner cylinder 5. It is a thing.

  As shown in each figure, the inner cylinder 5 is thinner than the outer cylinder 2 and has a substantially cylindrical shape with only the tip opened, and is rotatable in the circumferential direction with respect to the outer cylinder 2. Is to be fitted. Further, an inner communication hole 53 is passed through the central portion of the side surface of the inner cylinder 5. Further, a distal end portion of the inner cylindrical body 5 is provided with a movable protrusion 51 that protrudes in an axial direction into a substantially semi-cylindrical shape that forms a part of the engagement structure 7. A surface 52 is formed. The middle cylinder has a ring-shaped protrusion that protrudes in a ring shape in the radial direction at the base end portion, and corresponds to the ring-shaped protrusion as shown in the cross-sectional views of FIGS. A ring-shaped groove is formed on the inner peripheral surface on the proximal end side of the outer cylindrical body 2. The inner cylinder 5 is inserted from the proximal end side opening of the outer cylinder 2 and the inner cylinder 5 is detached from the outer cylinder 2 by engaging the ring-shaped protrusion and the ring-shaped groove. There is no way.

  As shown in the drawings, the handle 6 is a flat plate member extending in the radial direction at the base end portion of the inner cylinder 5, and the handle 6 is gripped to rotate the inner cylinder 5. The communication state between the outer communication hole 21 and the inner communication hole 53 can be switched. More specifically, as shown in FIG. 3, when the cock 100 is viewed from the top, the word “open” is visible, and the inner communication hole 53 of the inner cylinder 5 and the outer communication of the outer cylinder 2 The holes 21 communicate with each other. On the other hand, as shown in FIG. 4, when the handle 6 is rotated 180 ° in the circumferential direction, and when the cock 100 is seen from the upper side, “closed” can be seen, the inner communication hole of the inner cylinder 5 53 also rotates 180 ° in the circumferential direction and is positioned on the opposite side of the outer communication hole 21 of the outer cylindrical body 2. Therefore, in this case, the outer communication hole 21 is closed by the outer surface of the inner cylinder 5, and the liquid in the liquid storage container C does not flow into the cock 100.

  As described above, the handle 6 is opened when the inner cylinder 5 is rotated in the circumferential direction so that the outer communication hole 21 and the inner communication hole 53 communicate with each other, or the outer communication hole 21 and the inner communication hole 21 communicate with each other. The communication hole 53 can be switched to one of the closed states in which the communication hole 53 is not in communication.

  As shown in FIGS. 2 and 4, the engagement structure 7 is configured so that the distal end portion of the inner cylinder 5 and the inner surface of the lid body 3 are engaged with each other in the closed state so that the inner cylinder 5 This is a structure that prevents the outer cylinder 2 from rotating in the circumferential direction. More specifically, the inner cylinder 5 can freely rotate with respect to the circumferential direction when the lid 3 is not covered with the lid 3, but the inner cylinder 5 is covered with the lid 3. Even if the handle 6 is to be rotated more than a predetermined angle from the closed state, the movable engagement surface 52 is hooked on the fixed engagement surface 32 and cannot be rotated any further. The communication hole 53 and the outer communication hole 21 are prevented from communicating with each other.

  More specifically, the lid 3 is connected to the distal end portion of the outer cylindrical body 2 by the hinge 4 so as not to rotate substantially in the circumferential direction. Therefore, when the lid 3 is covered and the movable engagement surface 52 and the fixed engagement surface 32 are engaged with each other, the inner cylinder 5 is also circumferentially moved by the lid 3. It will be fixed so that it cannot rotate.

  In this embodiment, the lid 3 and the inner cylinder 5 are prevented from substantially rotating with respect to the circumferential direction. For example, in the hinge 4, the rigidity in the circumferential direction is the lid. It can be said that it is set sufficiently larger than the rigidity in the movable rotation direction 3.

  The details of the movable engagement surface 52 and the fixed engagement surface 32 will be further described below.

  The movable engagement surface 52 is formed on a movable protrusion 51 that is a portion that protrudes outward from the outer cylindrical body 2 at the tip of the inner cylindrical body 5 as shown in FIGS. . The movable protrusion 51 is formed in a substantially semicircular shape, and the movable engagement surface 52 is formed as two end surfaces in the circumferential direction.

  On the other hand, as shown in FIGS. 3, 4 and 5, the fixed engagement surface 32 is a fixed protrusion protruding in a substantially 1/4 cylindrical shape protruding in the axial direction from the inner surface on the top surface side of the lid 3. 31 are formed as two end faces in the circumferential direction.

  As shown in FIG. 3, the movable protrusion 51 and the fixed protrusion 31 interfere with each other in the open state so that the lid 3 cannot cover the movable protrusion 51 and the fixed protrusion 31. In other words, as shown in FIG. 4, the inner communication hole 53 of the inner cylinder 5 is directed upward by the handle 6, and the movable protrusion 51 is connected to the hinge in a closed state where the inner communication hole 53 is not in communication with the outer communication hole 21. The fixed projection 31 is provided on the side opposite to the hinge 4 in the closed state. With this configuration, the lid 3 can cover the inner cylinder 5 only in the closed state, and the movable engagement surface 52 and the fixed engagement surface 32 are arranged to be opposed to each other and engaged. be able to. Accordingly, only when the inner cylinder 5 is in the closed position by the handle 6, the lid 3 can be locked so that the inner cylinder 5 does not rotate in the circumferential direction. it can.

  More specifically, as shown in FIGS. 2 and 4, when the handle 6 is closed in the horizontal direction, there is a gap between the movable engagement surface 52 and the fixed engagement surface 32. In this way, the lid 3 is easily covered with the tip of the inner cylinder 5. When the handle 6 is turned counterclockwise from this state, the movable engagement surface 52 engages with the fixed engagement surface 32 facing upward in the lid 3, and the inner cylinder 5 rotates. Movement is prevented. In the closed state, if the handle 6 is rotated clockwise, the handle 6 interferes with the upper surface of the plug 1 and cannot be rotated, so that the handle 6 is not opened. If the handle 6 and the spigot 1 are made so as not to interfere with each other, when the handle 6 is rotated clockwise, the inner cylinder 5 can be rotated up to 90 °. In the lid 3, the other of the movable engagement surfaces 52 is engaged with another fixed engagement surface 32 facing in the horizontal direction, so that further rotation of the inner cylindrical body 5 is prevented. The That is, even if the inner cylinder 5 rotates in any direction, it cannot be rotated until the inner communication hole 53 and the outer communication hole 21 communicate with each other, and the closed state remains maintained.

  Thus, according to the cock 100 of the present embodiment, the engagement structure 7 and the lid 3 fixed so as not to rotate in the circumferential direction by the hinge 4 are provided. The lid 3 covers the tip of the inner cylinder 5 so that the movable protrusion 51 is engaged with the fixed engagement protrusion so that the inner cylinder 5 does not rotate in the circumferential direction. Can be fixed to.

  Therefore, it is possible to prevent a force from being applied to the handle 6 for some reason as in the prior art, and the inner cylinder 5 to rotate unintentionally without providing a separate stopper or the like. For this reason, the cock 100 can be configured by only two resin molded parts of the main body MB and the operation part OP while having a function of preventing the rotation of the inner cylinder 5 even in the closed state. This can reduce the number of parts and the number of assembly steps, thereby reducing the manufacturing cost.

  In addition, since the engagement structure 7 is formed between the inner cylinder 5 and the lid 3 that is detachably provided with respect to the distal end portion of the inner cylinder 5, the inner cylinder 5 The function of preventing rotation in the circumferential direction can be exhibited repeatedly.

  Further, since the lid 3 that forms a part of the engagement structure 7 is fixed to the outer cylinder 2 by the hinge 4, the outer cylinder 2 even when the lid 3 is not covered. There is no need to find a place for the lid.

In addition, since the engagement structure 7 is configured so that the lid 3 can cover the inner cylinder 5 only in the closed state, the inner cylinder 5 can be reliably rotated only in the closed state. Can be locked, and it is not mistaken for being fixed so that no liquid leaks out even though it is open. Further, even during manufacture, by shipping after assembly with the lid 3 covered with the lid body 3, it is possible to reliably prevent the operation portion OP from being assembled in an incorrect posture with respect to the main body portion MB. Therefore, assembly errors can be prevented and the product quality can be further improved.
Further, in the present embodiment, since the engaging structure 7 is formed between the distal end portion of the inner cylinder 5 and the lid body 3, the lid body 3 is a lid for opening the distal end of the inner cylinder body 6. In addition to the function of performing the above, the function of locking the rotation of the inner cylinder 6 in the circumferential direction can also be achieved. That is, a plurality of functions can be realized only by the lid 3 and the number of parts can be reduced.

  Other embodiments will be described.

In the embodiment, the lid 3 is formed with a 1/4 cylindrical shape as the fixed protrusion 31, but may be formed in a semi-cylindrical shape like the movable protrusion 51, for example. . Various engagement structures 7 are conceivable as shown in FIG. Specifically, as shown in FIG. 6A, an uneven structure 54 in which unevenness appears alternately in the circumferential direction is provided at the tip of the inner cylinder 5, and the cover 3 is provided with the uneven structure 54. You may form the reverse uneven structure 34 which fits with respect to. Further, as shown in FIG. 6B, a key 55 is provided at the tip of the inner cylinder 5, and a key groove 35 that can be fitted to the key 55 is formed in the lid 3. Also good. In this way, the movable engagement surface 52 and the fixed engagement surface 32 forming the engagement structure 7 are formed, and the end portion of the inner cylinder body 5 or the outer cylinder body 2 is formed by the lid body 3. The lid can be prevented from rotating from the closed state to the open state. Further, as can be seen from FIG. 6, the engagement structure 7 may be configured such that the movable engagement surface 52 and the fixed engagement surface 32 are engaged with each other from the time when the lid 3 is covered. The inner cylinder 5 may be allowed to rotate as long as it is within the open range as in the embodiment. What is necessary is just to comprise so that the said engagement structure 7 may exhibit a lock function, when the said inner cylinder 5 rotates in the circumferential direction only by the predetermined angle. Further, as shown in FIG. 7, the side surface shape of the tip portion of the inner cylindrical body 5 that protrudes outward from the outer cylindrical body 2 is formed not as a cylindrical curved surface but as a polygonal shape such as a regular hexagon, The movable engagement surface 52 may be used. In this case, when the front end portion of the inner cylinder 2 is covered with the lid 3, the fixed protrusion 31 and the fixed engagement are engaged with the movable engagement surface 52 or the same surface. The engagement structure 7 may be configured by forming the surface 32.
Further, the movable engagement surface 52 may be formed on the outer peripheral surface of the distal end portion of the inner cylinder 5 or may be formed on the inner peripheral surface of the inner cylinder 5. For example, as shown in FIG. 7B, the inner peripheral surface of the tip of the inner cylinder 5 may be formed in a polygonal shape such as a regular hexagon, and the inner peripheral plane may be used as the movable engagement surface 52. Also in this case, for example, when the lid 3 covers the tip of the inner cylinder 2, the triangular protrusions 31 are formed so as to be flush with the movable engagement surface 52, and the side surfaces thereof are formed. The engagement structure 7 may be configured with the fixed engagement surface 32 as the above.

  Further, the fixing structure between the lid 3 and the outer cylinder 2 is not limited to the hinge 4, and the fixing structure is such that the lid 3 does not rotate at least in the circumferential direction. Anything is acceptable. For example, as shown in FIG. 7, when the lid 3 is not covered with the lid 3 as in the case of the hinge 4, the lid 3 is not maintained in the state of being raised up to the upper part of the outer cylinder 2, and the open position and closed position A connection structure 41 configured to be bendable between the outer cylinder body 2 and the lid body 3 may be formed. Even in this case, if the rigidity in the circumferential direction of the connection structure 41 is configured to be sufficiently larger than the rigidity around the radial axis, it is possible to achieve substantially the same effect as in the above embodiment.

  The cock of the present invention is not limited to the use example shown in the above embodiment, and may be used for various types.

  In addition, various modifications and combinations of the embodiments may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Cock 1 ... Plug 2 ... Outer cylinder 21 ... Outer communication hole 3 ... Lid 31 ... Fixed protrusion 32 ... Fixed engagement surface 34 ... Reverse Uneven structure 35 ... key groove 4 ... hinge 5 ... inner cylinder 51 ... movable protrusion 52 ... movable engagement surface 53 ... inner communication hole 54 ... uneven structure 55 ... -Key 6 ... Handle 7 ... Engagement structure MB ... Body part OP ... Operation part C ... Liquid storage container

Claims (7)

An outer cylinder having both ends open;
An outer communication hole formed through the side surface of the outer cylinder, and communicated with the interior of the liquid storage container;
A front end portion that is open, and an inner cylindrical body that is rotatably fitted in a circumferential direction inside the outer cylindrical body;
An inner communication hole formed through the side surface of the inner cylinder,
Provided in the base end side of the inner cylinder, and the inner cylinder is rotated in the circumferential direction so that the outer communication hole and the inner communication hole communicate with each other, or the outer communication hole A handle configured to be switchable to any of the closed states in which the inner communication hole is not in communication,
A lid that is fixed so as not to rotate substantially in the circumferential direction with respect to the outer cylindrical body, and is configured to detachably close a tip opening of the inner cylindrical body;
Engagement formed between the tip of the inner cylinder and the lid, and formed so that the inner cylinder and the lid are engaged in the circumferential direction in the closed state And a cock characterized by comprising a structure.   The cock according to claim 1, wherein the engagement structure is configured to allow the lid to close the front end opening of the inner cylinder only in the closed state. The engagement structure is a movable engagement surface formed at the tip of the inner cylinder;
The cock according to claim 1 or 2, comprising a fixed engagement surface provided inside the lid. The movable engagement surface is formed on a movable protrusion protruding from the lid side of the tip of the inner cylinder in the closed state;
The fixed engagement surface is positioned on the side opposite to the side on which the lid is fixed in the outer cylinder in a state where the lid closes the inner cylinder or the outer cylinder. The cock according to claim 3, wherein the cock is formed on a fixed protrusion protruding from the inner surface of the lid.   5. The lid according to claim 1, wherein the lid is configured not to pivot substantially in the circumferential direction by a hinge provided between the lid and the distal end portion of the outer cylinder. The cock described in.   The cock according to any one of claims 1 to 5, further comprising a spigot provided on the outer surface of the outer cylinder so as to surround the outer communication hole and attached to the liquid storage container. The outer cylinder and the lid are integrally molded with resin,
The cock according to any one of claims 1 to 6, wherein the inner cylindrical body and the handle are integrally molded with resin.