JP2001088853A - Rubber lid for container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid for a container having a notch at an outer circumference of its pouring port, having a poor accuracy in size made of porcelain or the like which is convenient in use and less expensive in its price. SOLUTION: This lid is a sheet-like lid made of rubber resilient material. An outer edge of the lid has an endless protrusion of which inner diameter is smaller than a diameter of the deepest segment of the notch in the container and the entire lid is expanded and installed at the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid of a container for enclosing a liquid, a solid, and a gas.

[0002]

2. Description of the Related Art There are a screw type, a fitting type, a method of covering a thin film sheet such as paper and wrap, and tying a mouth with a string or rubber. The screw method and the fitting method require dimensional accuracy of the container, so they are used for mass-produced containers such as plastic and glass. However, pottery pots and the like have poor dimensional accuracy, and are often covered with sheets. However, when the sheet is covered, since the sheet is always overlapped at the binding portion, it is difficult to completely seal the liquid or gas, and particularly when the liquid is enclosed, the liquid or gas may leak due to the capillary phenomenon.

[0003]

SUMMARY OF THE INVENTION It was investigated whether a simple and inexpensive lid for a container can be provided which covers a sheet, does not overlap the sheet, and exhibits a sealing effect without being tied with a string.

[0004]

Means for Solving the Problems A thin sheet made of a rubber-like elastic material is provided endlessly with a protrusion having an inner diameter smaller than the diameter of the deepest portion of the hollow of the container at the outer edge of the sheet, and the protrusion is larger than the outer diameter of the container. By attaching and fixing the sheet projection to the recess of the container while expanding it to the extent possible, even for containers with poor dimensional accuracy, there is no overlap of the sheet at the projection mounting part, and the restoring force due to the expansion of the sheet and the projection acts as a sealing force. Prevent leakage of container contents.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. As shown in FIG. 1, an O-ring-shaped projection having a wire diameter of 5φ is formed of a circular sheet of silicon rubber as shown in FIG.
It is assumed that the lid is provided at the position where For mounting on the pot, a part of the O-ring-shaped projection of the lid is housed in the cavity of the container, and the entire projection is housed in the cavity of the container while expanding the entire lid. The outer diameter of the deepest part of the depression is 14 as shown in FIG.
Because it is 3φ, the O-ring part is stretched about 10%, and its restoring force becomes the fixing force to the hollow and the sealing force,
Further, the restoring force generated by the expansion of the sheet portion in contact with the maximum outer diameter of the crucible also acts as a sealing force. Moreover,
Even if there is a variation in the size of the injection port of the pot, it is possible to seal the sheet within the range of the sheet expansion degree. These sealing forces become stronger as the force required for expansion at the time of mounting increases, but mounting becomes difficult. The force required for mounting is the hardness of the rubber,
It varies greatly depending on the thickness, the degree of expansion, and the shape of the lid.

[0006] As for the shape of the lid, the pot inlet may be flat, but the mounting around the projection is easier if it is similar to the shape of the outer periphery of the pot. The surface with the projection may be flat or curved, but as shown in FIG. 3, when the angle between the tangent plane and the horizontal plane at the position of the projection on the surface where the projection is formed is α, the larger α is, the easier the mounting is, As it approaches zero, the degree of expansion increases and mounting becomes more difficult. However, as α increases, the cost of the mold for manufacturing the lid increases, and at the same time, the frequency of demolding from the mold and occurrence of poor flow increase, so that α is 90.
The degree is preferably within degrees, and if possible α is zero degree, it is more economical in terms of production cost.

When the angle α was zero, the hardness of the rubber and the thickness of the sheet were examined in order to facilitate mounting.
Water was added to the lid shown in FIG.
It was attached to the pot of FIG. 1 having a depth of 20 mm and left standing for 15 hours with the pot turned sideways and upside down. However, when mounting with the lid, if it is locally expanded too much, the sheet may tear due to insufficient strength. In the case of silicon rubber, the strength depends on the hardness and the thickness, so that the higher the hardness, the better the thickness, but the mounting becomes difficult.

The angle α is set to zero degree and the hardness is increased to 50 HS,
A lid having a thickness of 0.5 mm was provided with a slack on the inner diameter side of the protrusion to facilitate mounting. Since the force required for expansion can be controlled by the size, position, and number of slacks, as a result of examination, when the lid with the slack shown in FIG. 4 is mounted on the pot, it can be mounted without tearing, and a leak test can be performed under the same conditions as above. When I went, there was no leakage even if I turned over and turned upside down.

[0009] The protrusions of the lid referred to above are O-ring shaped,
The shape of the dent of the container such as a square can be freely selected, and the dent of the container can be used as a dent by providing a protrusion on the container in addition to the dent seen in the pit of FIG.
The container is not limited to a pot, but any container having a recess or protrusion may be used.However, plastics and glass can be produced with high dimensional accuracy. Is optimal.

Regarding the shape of the slack of the lid for facilitating mounting, it is sufficient to have a portion that does not require a force for expansion, such as a trapezoid or a square, in addition to a round shape. As for the material of the lid, if it is a rubber-like elastic material, it can be used for so-called rubber, thermoplastic rubber, and plastics such as 1-2 polybutadiene, which can be used if the stability is maintained for a long time after expansion. It can be selected appropriately according to the contents to be performed.

[0011]

According to the present invention, a lid having a high sealing force, a simple structure, and an inexpensive lid can be obtained from a rubber-like elastic body of a container having poor dimensional accuracy, such as a pot having a depression.

[Brief description of the drawings]

FIG. 1 is a diagram of a pot

FIG. 2 is a view of a lid having a projection on a horizontal surface.

FIG. 3 is a view of a lid in which a surface on which a projection is provided has an angle α with respect to a horizontal plane.

FIG. 4 is a view of a lid provided with a projection on a horizontal surface and a slack provided on an inner diameter side of the projection.

Claims (4)

[Claims] 1. A container having a hollow at an outer periphery of an inlet.
It is a sheet-like lid made of rubber-like elastic material, and has an endless projection at the outer edge of the lid smaller than the diameter of the deepest part of the depression of the container. The projection and the entire lid are expanded, and the projection is formed by the depression of the container. The rubber-like elastic body is characterized in that it is fitted and mounted to enclose the contents, and at the same time, the leakage of the contents is prevented at the protrusion and the contact portion between the container and the lid by the restoring force generated by the expansion of the lid. lid. 2. When the lid is convex upward and the peripheral edge of the lid is on the same horizontal plane, the angle formed by the tangent plane at the position of the projection on the surface where the projection is provided and the horizontal plane is an angle viewed from the inside of the lid. Lid that is within 90 degrees. 3. The lid according to claim 1, wherein a slack is provided on the inner diameter side of the projection to facilitate expansion of the lid when the container is mounted. 4. The method according to claim 1, which is used for a pot-shaped container made of earthenware.
A lid according to the second and third aspects.