JP7100007B2 - Liquid container - Google Patents

Description

The present invention relates to a liquid container for containing a liquid such as a PET bottle in a sealed state.

In a general PET bottle for beverages, a screw thread for wearing a cap screw formed on the neck of the container is formed as a single-threaded screw, and the number of turns is set to about one and a half to two turns.

Therefore, in general, the angle at which a person can turn the cap with one screwing operation or screwing operation is about 90 °. Therefore, in the case of the number of turns, the person has to insert and remove the cap about 5 to 8 times. A screwing operation or a screwing operation is required.

Since it was very troublesome for the elderly and children to perform such a screwing operation or a screwing operation many times, the number of screwing operations (screwing operations) has been reduced in the past. Therefore, for example, a PET bottle that employs a multi-threaded screw as shown in Patent Document 1 and can screw and remove a cap with a small amount of operation has been proposed.

Japanese Unexamined Patent Publication No. 2005-1677

By the way, PET bottles for beverages are provided with a sealing piece on the back side (inside of the upper plate) of the cap to seal the container opening, and when the cap is screwed into the container, this sealing piece opens the container. It is press-fitted into the portion, and the sealing piece is pressed against the inside of the opening forming wall of the opening to seal the container opening and prevent leakage of the beverage in the container.

Therefore, in the screwing operation of screwing the cap into the container, the screwing operation is performed from the middle to the final stage of the screwing operation in which the sealing piece is press-fitted into the opening of the container, and in the screwing operation of removing the cap from the container, the screwing operation is performed. A large operating force is required because a large frictional resistance is generated between the sealing piece and the opening forming wall of the container opening toward the middle of the screwing operation in which the sealed piece press-fitted from the start is separated from the container opening. Will be.

In the case of a multi-threaded screw with a small amount of operation as described above, it is necessary to increase the inclination angle of the screw thread in order to sufficiently press the sealed piece into the opening of the container with a small amount of operation. The larger the tilt angle of, the larger the operating force is required.

A person is relatively easy to apply force in the screwing operation that operates the cap in the clockwise direction, but it is difficult to apply force in the screwing operation that operates in the counterclockwise direction. It becomes difficult to operate the cap, especially the screwing operation (it becomes difficult to open the cap), which causes a problem that the practicality is impaired.

The present invention has been made in view of the above-mentioned current situation, and provides a highly practical liquid container in which the amount of operation of the cap is small and the operation of screwing and screwing can be easily performed. The purpose.

The gist of the present invention will be described with reference to the accompanying drawings.

A container body 1 having a cylindrical neck portion 2 having an opening as a spout at the upper portion and a cap 3 screwed to the neck portion 2 are formed, and an annular seal is formed on the inner surface of the upper plate of the cap 3. The stop piece 5 is vertically provided, and when the cap 3 is screwed to the neck portion 2, the sealing piece 5 comes into contact with the inside of the opening forming wall 2a of the opening of the neck portion 2, and the opening portion is formed. In a liquid container configured to seal
The cap 3 has a configuration in which a plurality of cap-side screw portions 4 are provided on the inner peripheral surface along the circumferential direction, and the container body 1 has the caps of the cap 3 on the outer peripheral surface of the neck portion 2. A plurality of container-side screw portions 6 to which the side-threaded portions 4 are screwed are provided , and each of the container-side screw portions 6 is screwed in when the cap 3 is screwed to the neck portion 2. In the operation, the convex portion 6a for screwing to guide the screw portion 4 on each cap side of the cap 3 and the screw portion 4 on each cap side are guided in the screwing operation when the cap 3 is removed from the neck portion 2. Equipped with a convex portion 6b for screwing,
The screwing convex portion 6a is set to a downward inclination angle and a length that allows the cap 3 to be screwed to the neck portion 2 by the screwing operation of 1/4 rotation (rotation of 90 degrees) or less. hand,
By fitting the cap 3 from above the neck portion 2 without screwing operation, each cap-side screw portion 4 constitutes the container-side screw portion 6 and the screw-in convex portion 6a and the screw-out portion. The cap 3 is arranged between the convex portion 6b for screwing and the screw portion 4 on the cap side is arranged between the convex portion 6a for screwing and the convex portion 6b for screwing. When the screwing operation of 1/4 turn or less is performed, each of the cap-side screw portions 4 abuts on each of the screwing convex portions 6a, and the screwing convex portions 6a are inclined downward. The cap 3 is screwed to the neck portion 2 while moving along the line, and the sealing piece 5 of the cap 3 presses against the inside of the opening forming wall 2a of the neck portion 2 to form the neck portion 2. The opening is in a sealed state,
The screwing convex portion 6b is set to have a small tilt angle and a long length with respect to the downward tilt angle and the length of the screwing convex portion 6a . The cap 3 is set to an upward inclination angle and length that can be removed by screwing it from the neck 2 by the screwing operation of 1/4 rotation (90 degree rotation) or less.
When the cap 3 is screwed to the neck 2 and the cap 3 is screwed out by 1/4 turn or less, each of the cap-side screw portions 4 is screwed in the screwing operation direction. The screwing convex portion 6b is in contact with the screwing convex portion 6b, and the screwing convex portion 6a is formed at an upward inclination angle smaller than the downward inclination angle of the screwing convex portion 6a from the contacting position toward the screwing operation direction. The sealing piece 5 that moves along the convex portion 6b and is in pressure contact with the inside of the opening forming wall 2a of the neck portion 2 moves in a direction away from the opening forming wall 2a. The cap 3 is configured to be removed from the neck 2.
In the screwing convex portion 6b, when the cap 3 is screwed out from the state where the cap 3 is screwed to the neck portion 2, each of the cap-side screw portions 4 moves in the screwing operation direction. The upslope angle on the second half of the screwing operation direction is large and steep compared to the upslope angle on the first half of the screwing operation direction, which is formed so as to rise and incline from the abutting position toward the screwing operation direction. It is said that it is formed in a state,
The cap 3 is screwed from the neck 2 with respect to the force required for the screwing operation in which the cap 3 is rotated and screwed to the neck 2 to press the sealing piece 5 into the inside of the opening forming wall 2a. The cap 3 is configured to reduce the force required for the removal operation, and the cap 3 can be screwed in one screwing operation of 1/4 turn or less, and the screwing can be performed by the rotation angle of the screwing. The present invention relates to a liquid container, which is larger but is configured to be able to be operated by one screwing operation of 1/4 turn or less .

Further, the screwing convex portion 6a is set to a downward inclination angle and a length so that the cap 3 can be screwed to the neck portion 2 by the screwing operation of 1/12 rotation (30 degree rotation) or less. The screwing of the cap 3 can be performed by one screwing operation of 1/12 rotation or less, and the screwing is larger than the rotation angle of the screwing but 1/4 rotation (90 degrees) or less. The liquid container according to claim 1, wherein the liquid container is configured so that it can be operated by one screwing operation.

Further, the cap 3 screwed to the neck portion 2 is provided with a lock mechanism for preventing the cap 3 from being easily unscrewed except for the screwing operation, and this lock mechanism is provided on the cap side screw portion 4. It is characterized by comprising a locking portion 7 and a locking receiving portion 8 provided on at least one of the screwing convex portion 6a or the screwing convex portion 6b and engaging with the locking portion 7. It relates to the liquid container according to any one of claims 1 and 2 .

Since the present invention is configured as described above, the cap can be screwed or screwed off with a short rotation operation amount of 1/4 rotation (90 degree rotation or less) , and the screwing is difficult to apply force. Even in operation, the cap can be turned and removed with a small force, and the upwardly inclined inclined guide (convex part for screwing) that serves as a guide for the screw part on the cap side of the cap during this screwing operation has a small inclination angle. In addition, it has a long ascending slope and can be gradually screwed up with a small force. It is an epoch-making liquid container that can be screwed out and removed with a short operation rotation amount of 1/4 rotation (90 degree rotation or less) as in the case of screwing, with a steeper inclination than the side.

Therefore, it is a highly practical liquid container that can be easily put on and taken off by a weak elderly person or a child.

It is explanatory | exploded perspective view which shows this Example. It is sectional drawing which shows the cap of this Example. It is a bottom view which shows the cap of this Example. It is explanatory cross-sectional view which shows the screwed state of the cap of this Example. It is explanatory drawing which shows the neck part of the container body of this Example. It is explanatory development drawing of the neck part of the container body of this Example. It is a figure which shows another example (when the lock mechanism is provided) of this Example. It is explanatory drawing which shows the state (before the cap is fitted) of the screw part on the cap side at the time of the screwing operation of this Example. It is explanatory drawing which shows the state of the screw part on the cap side at the time of the screwing operation of this Example (when the cap is fitted, before the screwing operation). It is explanatory drawing which shows the state of the cap side screw part at the time of the screwing operation of this Example (the state where the cap side screw part is in contact with the screwing ridge part by screwing operation). It is explanatory drawing which shows the state of the screw part on the cap side at the time of completion of the screwing operation of this Example. It is explanatory drawing which shows the state (initial of a screwing operation) of the screw part on a cap side at the time of a screwing operation of this Example. It is explanatory drawing which shows the state of the screw part on the cap side at the time of the screwing operation of this Example (the state where the press-fitting state of a cap is almost released, the state where a cap is fitted, as in FIG. 9). Explanatory drawing which shows the state of the screw part on the cap side at the time of the screwing operation of this embodiment (the state which moved the steeply inclined region of the ridge part for screwing and the press-fitting state of a cap is completely released, the cap is removable state). Is. It is explanatory drawing which shows the state (cap removal state) of the screw part on the cap side at the time of the screwing operation of this Example.

Embodiments of the present invention which are considered to be suitable will be briefly described by showing the operation of the present invention based on the drawings.

When the cap 3 is fitted from above the neck portion 2 of the container body 1 and screwed in, a plurality of cap-side screw portions 4 provided on the inner peripheral surface of the cap 3 are provided on the outer peripheral surface of the neck portion 2 of the container body 1. It comes into contact with the screwing ridge 6a of the container-side screw portion 6 and moves along the screwing ridge 6a.

In this screwing operation, the screwing convex portion 6a of the present invention has an inclination angle and a length that allows the cap 3 to be screwed to the neck portion 2 by a screwing operation of 1/2 rotation or less, that is, 180 ° or less. Since it is set to, the cap 3 can be screwed in with a few screwing operations once or twice, and the sealing provided vertically inside the upper plate of the cap 3 by the screwing of the cap 3. The piece 5 is in contact with the inside of the opening forming wall 2a of the neck 2 of the container body 1 to seal the opening of the container body 1 and prevent the liquid contained in the container body 1 from leaking.

Further, when a screwing operation is performed to remove the cap 3 screwed to the container body 1, the cap-side screw portion 4 comes into contact with the screwing ridge portion 6b of the container-side screw portion 6, and the screwing ridge portion 6b is brought into contact with the screw portion. It moves along the portion 6b.

In this screwing operation, the screwing ridge portion 6b of the present invention is set to have a smaller inclination angle and a longer length than the screwing ridge portion 6a, so that the opening portion of the sealing piece 5 is opened. A screwing operation that requires a large force due to frictional resistance due to contact with the inside of the forming wall 2a is a screwing operation in which the cap 3 is screwed to the neck 2 and the sealing piece 5 is brought into contact with the inside of the opening forming wall 2a. It can be operated with less force than required for.

As described above, according to the present invention, the cap 3 can be screwed (fitted) to the container body 1 with a short screwing operation amount of 1/2 rotation or less, and a small force is applied in the screwing operation where it is difficult to apply a force. The cap 3 can be removed by the screwing operation of the above, and therefore, it becomes a highly practical liquid container that can be easily opened and closed even by a weak elderly person or a child.

Specific examples of the present invention will be described with reference to the drawings.

In this embodiment, the liquid container of the present invention is configured as a PET bottle for beverages as shown in FIG. Of course, the liquid container of the present invention can be configured in addition to the PET bottle for beverages.

In this embodiment, a container body 1 having a cylindrical neck portion 2 having an opening as a spout at the upper portion and a cap 3 screwed to the neck portion 2 of the container body 1 are composed of a cap 3 on the cap 3. An annular sealing piece 5 is vertically provided on the inner surface of the plate, and when the cap 3 is screwed to the neck 2, the sealing piece 5 is press-fitted into the upper opening of the neck 2 to form an opening wall 2a. It is a PET bottle for beverages configured to prevent leakage of beverages contained in the container body 1 by pressure-welding the inside to seal the opening of the neck portion 2.

Hereinafter, each component of the present embodiment will be described in detail.

As shown in FIGS. The cap-side threaded portion 4 is configured as a screw-on type cap provided along the circumferential direction.

Further, the cap 3 has an annular (cylindrical) sealing piece 5 suspended on the inner surface (back surface of the cap) of the upper plate, and as shown in FIG. 4, the cap 3 is attached to the neck portion 2 of the container body 1. When screwed, the sealing piece 5 is press-fitted into the opening of the neck portion 2 and is in contact with the inside of the opening forming wall 2a to seal the opening.

Further, the cap 3 of the present embodiment is provided with an unauthorized opening prevention band 9 (TE band: temper-evident band) at the lower portion of the peripheral surface to prevent unauthorized opening, and is in an unopened state at the time of purchase. It is configured so that it can be visually confirmed.

Further, the container body 1 to which the cap 3 is screwed is made of synthetic resin (polyethylene terephthalate: PET), and is provided with a cylindrical neck portion 2 having an opening serving as a spout at the upper portion. It is said that.

Further, as shown in FIG. 5, a plurality of container-side screw portions 6 for forming a multi-threaded screw into which the cap 3 is screwed are provided on the outer peripheral surface of the neck portion 2, and in the present embodiment, FIG. As shown in the above, six container-side screw portions 6 are provided to form a six-threaded screw.

Further, each container-side screw portion 6 has a screw-in ridge portion 6a for guiding the cap-side screw portion 4 in a screwing operation when the cap 3 is screwed to the neck portion 2, and when the cap 3 is removed from the neck portion 2. It is configured to be composed of a ridge portion 6b for screwing that guides the screw portion 4 on the cap side in the screwing operation of.

Specifically, as shown in FIG. 6, the container-side threaded portion 6 is integrally formed with the screwing ridge portion 6a and the screwing ridge portion 6b, and the screwing ridge portion 6b is formed. A ridge 6a for screwing is provided so as to enter the lower side, and the container-side screw portion 6 of this embodiment is a container-side screw on the front side in the screwing operation direction of two adjacent container-side screw portions 6. The screwing ridge portion 6a of the portion 6 and the screwing ridge portion 6b of the container-side screw portion 6 on the rear side are paired to guide each cap-side screw portion 4 of the cap 3. ing.

Further, the container-side threaded portion 6 has a cap 3 having an upper end portion (upper side connecting portion between the screwing convex strip portion 6a and the screwing convex strip portion 6b) having a rounded shape (R shape). When the cap side screw portion 4 is fitted to the neck portion 2 from above, the cap side screw portion 4 is less likely to be caught by the container side screw portion 6 and is smoothly fitted. It is configured to be attracted to the section 6b.

Further, the ridge portion 6a for screwing is set to an inclination angle and a length that allows the cap 3 to be screwed to the neck portion 2 by a screwing operation of 1/2 turn or less. The screwing ridge portion 6a of the embodiment has an inclination angle and a length that allows the cap 3 to be screwed to the neck portion 2 with a screwing operation amount of 1/18 to 1/12 rotation (20 ° to 30 °). Is set to. That is, the cap 3 is screwed into the screwing ridge portion 6a of the present embodiment with an operation amount smaller (smaller) than the angle (around 90 °) at which a person can turn the cap with one screwing operation. It is configured so that the cap 3 can be screwed in by one screwing operation, that is, one action.

Further, in the container-side screw portion 6 of the present embodiment, the screw-in ridge portion 6b that guides the movement of the cap-side screw portion 4 in the screwing operation when the cap 3 is removed is also the screw-in ridge portion 6a. Similarly, the cap 3 can be removed from the neck portion 2 with a screwing operation amount of 1/2 turn or less that a person can turn with one operation.

Furthermore, since it is more difficult for a person to apply a force to the screwing operation than to the screwing operation, the screwing ridge portion 6b is screwed so that the screwing operation can be performed with a smaller force than the screwing operation. The inclination angle is smaller and the length is set longer than that of the required ridge portion 6a.

Specifically, the screwing operation amount of the screwing convex portion 6b is about 2 to 3 times the operating amount of the screwing operation, that is, 1/6 to 1/4 rotation (60 ° to 90). The tilt angle and length are set so that the cap 3 can be removed from the neck 2 with a screwing operation amount of about °), and the cap 3 can be removed from the neck 2 with almost one screwing operation, similar to the screwing operation. Is configured to allow

Further, the screwing ridge portion 6b of the present embodiment is formed so that the tilted state on the latter half side in the screwing operation direction is steeper than the tilted state on the first half side in the screwing operation direction.

That is, in the screwing operation, the sealing piece 5 of the cap 3 is press-fitted into the opening of the container body 1 (the sealing piece 5 is pressed against the inside of the opening forming wall 2a of the neck portion 2 of the container body 1). The sealing piece 5 and the opening forming wall 2a are required after the middle stage of the screwing operation in which the press-fitting state of the sealing piece 5 is released to some extent because a large operating force is required in the operation in the above state), especially in the initial operation of the screwing operation. Since the frictional resistance with the screw becomes smaller or disappears and does not require a large operating force, the latter half of the screwing operation direction of the screwing convex portion 6b that does not require this large operating force is larger than the first half of the screwing operation direction. The cap 3 is formed in a steeply inclined state so that the cap 3 can be detached and moved with a small amount of operation. It is configured so that the cap 3 can be removed from the neck 2 by the ejection operation.

Further, in the case where the cap 3 can be screwed with a small amount of screwing operation as in this embodiment, if the cap 3 is not screwed to an appropriate position, the cap 3 can be screwed with a slight rotation of the cap 3. Since the beverage may come off and the beverage in the container body 1 may be spilled, a lock mechanism may be provided to prevent an unintended screwing rotation of the cap 3 other than the screwing operation.

The locking mechanism preferably has a simple configuration such as engagement between a concave portion and a convex portion.

Specifically, as shown in FIG. 7, a locking portion 7 formed in a concave portion is provided in the cap side screw portion 4, and a locking receiving portion 8 formed in the convex portion is provided in the screwing convex strip portion 6a. There is a configuration in which the locking portion 7 and the locking receiving portion 8 are locked by the uneven engagement. By setting the locking mechanism to the concave-convex engagement in this way, the concave portion and the convex portion are screwed in. A click feeling is obtained when engaging with the cap 3, and there is also an advantage that it is possible to recognize that the cap 3 has been screwed into an appropriate position. The configurations of the locking portion 7 and the locking receiving portion 8 are not limited to this embodiment, and the position, number, shape, and the like can be appropriately changed in design.

The operation and effect of this embodiment (mainly the operation and effect at the time of screwing operation and screwing operation) configured as described above will be described below.

In this embodiment, as shown in FIGS. 8 and 9, when the cap 3 is fitted by pressing the cap 3 above the neck portion 2 of the container body 1, the sealing piece 5 provided on the cap 3 becomes the neck portion of the container body 1. In addition to being in contact with the opening edge of 2 (the tip is lightly press-fitted), the plurality of cap-side screw portions 4 provided on the inner peripheral surface of the cap 3 form the neck portion 2 of the container body 1. Between the container-side threaded portion 6 and the container-side threaded portion 6 provided on the outer peripheral surface, specifically, one screwing ridge portion 6a and the other screwing portion of the adjacent container-side threaded portions 6 It is in a state of being disposed between the convex portion 6b and the convex portion 6b.

When the cap 3 fitted to the neck portion 2 of the container body 1 is screwed in, as shown in FIG. 10, each cap-side threaded portion 4 comes into contact with the screwing ridge portion 6a, and further screwing operation results in the screwing operation. As shown in FIG. 11, the cap-side threaded portion 4 moves along the screwing ridge portion 6a, the cap 3 is screwed to the neck portion 2, and the sealing piece 5 of the cap 3 is the container body 1. The sealing piece 5 is press-fitted into the opening of the neck portion 2 and the sealing piece 5 is pressed against the inside of the opening forming wall 2a forming the opening to seal the opening.

In the screwing operation for screwing the cap 3, in this embodiment, the cap-side screw portion 4 makes about 1/18 rotation (about 20 rotations) from the state where the cap-side screw portion 4 is in contact with the screw-in ridge portion 6a of the container-side screw portion 6. Since the cap 3 can be screwed to the neck 2 with a small amount of operation (°), the screwing operation can be done only once (one action), and there is no need to repeat the screwing operation many times as in the past. , Even elderly people and children can easily screw the cap 3 to the neck part 2.

Further, as shown in FIG. 12, when the screwing operation is performed to remove the screwed cap 3, the cap-side threaded portion 4 moves along the screwing convex strip portion 6b.

Specifically, in the screwing operation, the sealing piece 5 is press-fitted into the opening of the neck 2, that is, the sealing piece 5 is pressed against the inside of the opening forming wall 2a of the neck 2. From the state to the cap-fitted state (the state in which the sealing piece 5 is slightly press-fitted) shown in FIG. 4 moves. As a result, the amount of operation is larger than that of the screwing operation, but the operation amount can be smaller than that of the screwing operation, and it is difficult for weak people such as the elderly and children to apply force in the screwing operation. Will be able to perform the screwing operation relatively easily.

Then, when the press-fitting state of the sealing piece 5 into the opening of the neck portion 2 is almost released, the cap-side threaded portion 4 is formed with a steep slope of the screwing ridge portion 6b as shown in FIG. The cap 3 rises with a small amount of operation by moving in the steeply inclined region, and the cap 3 can be removed as shown in FIG.

In the screwing operation for removing the cap 3, as described above, in this embodiment, the front half side of the screwing operation direction of the screwing convex portion 6b is set to be gentler than the screwing convex portion 6a. , It can be operated with a smaller operating force than in the screwing operation, and even in the screwing operation where it is difficult to apply force, the screwing operation for releasing the sealed piece 5 in the press-fitted state can be easily performed. Moreover, in this embodiment, since the cap 3 can be removed by a screwing operation of about 1/6 rotation (about 60 °), the screwing operation is performed once (similar to the screwing operation). Only one action) is required, and the cap 3 can be easily removed from the neck 2.

As described above, in this embodiment, both the screwing operation and the screwing operation can be completed by one operation, that is, one action, and troublesome operations such as picking up in repeated operations are not required, which is easy. The cap 3 can be opened and closed, and the cap 3 can be removed with a small force (about 1/3 of the force compared to the screwing operation) in the screwing operation where it is difficult to apply force. It will be an epoch-making PET bottle container (liquid container) that can be easily opened and closed even by weak elderly people and children.

The present invention is not limited to the present embodiment, and the specific configuration of each constituent requirement can be appropriately designed.

1 Container body 2 Neck 2a Opening wall 3 Cap 4 Cap side screw part 5 Sealing piece 6 Container side screw part 6a Convex part for screwing 6b Convex part for screwing 7 Locking part 8 Locking receiving part

Claims (3)

It consists of a container body having a cylindrical neck with an opening as a spout at the top and a cap screwed to the neck, and an annular sealing piece is vertically provided on the inner surface of the upper plate of the cap. A liquid configured such that when the cap is screwed onto the neck portion, the sealing piece comes into contact with the inside of the opening forming wall of the opening portion of the neck portion to seal the opening portion. In the container
The cap has a configuration in which a plurality of cap-side screw portions are provided on the inner peripheral surface along the circumferential direction, and the container body has the cap-side screw portions of the cap screwed on the outer peripheral surface of the neck portion. A plurality of matching container-side screw portions are provided , and each of the container-side screw portions is a cap-side screw of the cap in a screwing operation when the cap is screwed to the neck portion. It is provided with a convex portion for screwing to guide a portion and a convex portion for screwing to guide each cap side screw portion in a screwing operation when removing the cap from the neck portion.
The screwing convex portion is set to a downward inclination angle and length that allows the cap to be screwed to the neck portion by the screwing operation of 1/4 rotation (rotation of 90 degrees) or less .
By fitting the cap from above the neck portion without screwing operation, the screw portion on each cap side constitutes the screw portion on the container side, and the convex portion for screwing and the convex portion for screwing are formed. The cap is screwed in at least 1/4 turn in a state where each cap side screw portion is arranged between the screwing convex portion and the screwing convex portion. When the operation is performed, each of the cap-side screw portions abuts on each of the screwing convex portions and moves along the downwardly inclined screwing convex portion, and the cap is screwed to the neck portion. At the same time as being worn, the sealing piece of the cap is pressed against the inside of the opening forming wall of the neck, and the opening of the neck is in a sealed state.
The screwing convex portion is set to have a small tilt angle and a long length with respect to the downward tilt angle and length of the screwing convex portion, and 1 /. It is set to an ascending tilt angle and length that allows the cap to be screwed out from the neck and removed by the screwing operation of 4 rotations (90 degree rotation) or less.
When the cap is screwed to the neck portion and the cap is screwed out by 1/4 turn or less, each of the cap-side screw portions has a convex shape for screwing in the screwing operation direction. Along the screwing convex portion formed at an upward tilt angle smaller than the downward tilt angle of the screwing convex portion from the contacting position toward the screwing operation direction. The cap is configured to be removed from the neck by moving and moving in a direction in which the sealing piece that is in pressure contact with the inside of the opening forming wall of the neck moves away from the opening forming wall. And
This convex portion for screwing is screwed from a position where the screw portions on each cap side move in the screwing operation direction and come into contact with each other when the cap is screwed out from the state where the cap is screwed to the neck portion. The upslope angle on the second half of the screwing operation direction is larger than the upslope angle on the first half of the screwing operation direction, which is formed so as to rise and incline toward the ejection operation direction. It is said that it is configured
Necessary for the screwing operation to remove the cap from the neck, as compared with the force required for the screwing operation in which the cap is rotated and screwed to the neck to press the sealing piece into the inside of the opening forming wall. The cap is configured to reduce the force, and the cap can be screwed in by one screwing operation of 1/4 turn or less, and the screwing is also larger than the rotation angle of the screw, but 1/4 turn. A liquid container characterized in that it can be operated by the following single screwing operation . The screwing convex portion is set to a downward inclination angle and length that allows the cap to be screwed to the neck portion by the screwing operation of 1/12 rotation (30 degree rotation) or less. The screwing of the cap can be performed by one screwing operation of 1/12 rotation or less, and the screwing is one screw of 1/4 rotation (90 degrees) or less, which is larger than the rotation angle of the screwing. The liquid container according to claim 1, wherein the liquid container is configured so that it can be operated by a ejection operation. A lock mechanism for preventing the cap screwed to the neck portion from being easily unscrewed except for the screwing operation is provided, and this lock mechanism is provided with a locking portion provided on the cap side screw portion . 1. The liquid container according to item 1.

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