JP3653714B2 - Liquid container stopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stopper that is attached to the mouth of a liquid container such as a pot or a thermos bottle and prevents the inside of the liquid container from becoming a negative pressure and can be easily removed.
[0002]
[Prior art]
If you put hot water in a liquid container such as a pot, leave the stopper closed, and leave it for a long time, the hot water in the container will cool and the vapor pressure will drop, so the inside of the container will become negative pressure and it will be difficult to remove the stopper. . As a technique for dealing with the inconvenience that makes it difficult to remove the stopper due to the negative pressure in the container, a pot sealing stopper disclosed in Japanese Utility Model Publication No. 58-39552 is known. The hermetic plug described in this publication is provided with a concave groove on the entire outer periphery of the plug, and an annular seal packing having a tongue piece protruding outward and downward is fitted into the concave groove. The tongue piece is characterized in that it can be pressed against the inner surface of the pot body for storing the content liquid. And in this sealing plug, when the inside of the pot becomes negative pressure, the tongue piece automatically bends inward to take in the outside air, and the sealing plug can be easily removed by making the internal and external pressures substantially equal. . Further, the tongue piece of the seal packing described in the above publication has a substantially semicircular cross section.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional sealing plug, since the outer peripheral surface of the tongue piece is entirely formed by a curve, when the seal packing is formed, the mating surface of the mold usually makes it easy to pull out the molded product. The outer diameter part. In this case, traces of the mating surfaces of the mold (hereinafter referred to as burrs) are generated around the entire circumference of the maximum outer diameter portion having the most water stopping function. If burrs are generated on the outer surface of the tongue piece of the molded seal packing, the seal packing is not evenly applied to the container body, causing leakage. In order to prevent this leakage, it is necessary to strictly manage the burr or to devise a method so that the maximum outer diameter portion where the burr is generated does not hit the container body. In addition, if the mating surface of the mold is moved from the maximum outer diameter portion to either the vertical direction, when the molded product is removed, a thread may be generated between the molded product and the mold, and the tongue surface may be scratched. When the thread is large, the tongue piece breaks, and there is a problem in that the molding yield decreases.
[0004]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a plug that substantially eliminates a sealing failure caused by burrs generated during seal packing molding and prevents leakage of contents.
[0005]
[Means for Solving the Problems]
In the invention according to claim 1 of the present invention, an annular seal packing having a concave groove on the entire outer periphery of the plug body is provided over the entire circumference, and a tongue piece protruding outward and downward is formed on the entire circumference of the concave groove. In the stopper of the liquid container, which is fitted and can be pressed against the inner surface of the container body in which the liquid content is stored, the seal packing is molded, and the tongue piece is linear in the vertical direction. The liquid container stopper is characterized in that a straight portion extending to the surface is provided and the mating surface of the molding die is formed by selecting either the upper end or the lower end of the straight portion . The invention according to claim 2 is characterized in that the seal packing has a base portion extending outward in the radial direction, a hanging wall portion depending from the lower surface side of the base portion, and a linear shape downward from the tip of the base portion. 2. The stopper of a liquid container according to claim 1, further comprising a tongue piece having a straight portion extending in a straight line and a tip portion extending from the straight portion to a position close to the hanging wall portion. . The invention according to claim 3 is the liquid container according to claim 2, wherein the seal packing is disposed so as to be in pressure contact with the upper surface of the reduced diameter portion formed on the inner side surface of the mouth of the container body. It is a stopper.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows one embodiment of a liquid container stopper according to the present invention. In FIG. 1, the stopper 1 is in a state where it is screwed and fitted into a synthetic resin shoulder member 3 provided from the mouth portion to the shoulder portion of a container body 2 which is a metal vacuum double wall container. 2 is inserted and arranged.
[0007]
The plug 1 includes a synthetic resin-made main body 11 having a substantially bottomed cylindrical shape, a plug lid 12 that closes an upper opening of the main body 11, and a heat insulator 13 disposed in the main body 11. ing. A concave groove 14 that is recessed inward in the radial direction is formed in the vicinity of the lower end of the outer peripheral surface of the main body 11, and a seal packing 4 made of a flexible material is fitted into the concave groove 14. ing.
[0008]
As shown in FIG. 2, the seal packing 4 has an annular base 41, a hanging wall 42 depending from the lower surface side of the base 41, and linearly extending downward from the tip of the base 41. The tongue piece 45 includes a straight portion 43 and a tip portion 44 extending from the straight portion 43 to a position close to the hanging wall portion 42. The seal packing 4 is preferably made of a material having excellent heat resistance such as silicon rubber.
[0009]
The main body 11 of the plug 1 is provided with a flange 15 projecting radially outward at an upper portion thereof, and below the flange 15 is a screw portion that is screwed with a screw portion 32 provided on the shoulder member 3. 16 is provided. The heat insulator 6 disposed inside the main body 1a is made of an organic foam material such as foamed polystyrene or foamed urethane, or an inorganic powder such as pearlite powder.
[0010]
The container body 2 is a combination of a bottomed cylindrical inner container 21 and an outer container 22 made of a metal material such as stainless steel and titanium alloy, with a gap therebetween, and joined and integrated at each mouth, The gap is vacuum-sealed to form a vacuum heat insulating layer 23. The structure of the container body 2 is not limited to this example, and the structure in which the gap between the inner container 21 and the outer container 22 is filled with an organic foam material such as foamed polystyrene or foamed urethane or inorganic powder such as pearlite powder, For example, a gas having a lower thermal conductivity than air such as xenon or krypton may be sealed in the gap. Furthermore, at least one of the inner container 21 and the outer container 22 may be configured using a synthetic resin container.
[0011]
On the inner side surface of the inner container 2 a of the container body 2, a reduced diameter portion 24 bulging inward in the radial direction is formed. As shown in FIG. 1, in a state where the stopper 1 is attached, the seal packing 4 of the stopper 1 is pressed against the upper surface of the reduced diameter portion 24, thereby keeping the container body 2 sealed. .
[0012]
The shoulder member 3 is formed to extend from the outer surface of the shoulder portion of the container body 2 to the inside of the container body 2 through the upper end. A protrusion projecting radially inward is provided at the lower end of the shoulder member 3, and the protrusion is forcibly fitted into a recess provided on the outer surface of the container 22 of the container body 2. It has been. An annular packing 31 is interposed between the upper end portion of the container body 2 and the upper end portion of the shoulder member 3. Further, on the inner surface side of the portion of the shoulder member 3 that hangs down on the inner side of the container body 2, a screw portion 32 that is screwed into the screw portion 16 provided on the outer surface of the stopper 1 is formed.
[0013]
The stopper 1 having the above-described configuration is inserted into the mouth of the container body 2, the screw part 16 on the outer surface of the stopper 1 is screwed into the screw part 32 of the shoulder member 3, and the screw part 16 is turned in the closing direction. Install as shown in 1. In this mounted state, the tongue 45 of the seal packing 4 is pressed against the upper surface of the reduced diameter portion 24 of the inner container 21 to seal the inside of the container body 2. If hot water is put into the container main body 2 and the stopper 1 is closed, a negative pressure is generated as the temperature of the hot water inside the container decreases. In this stopper 1, when a negative pressure is generated in the container main body 2, the tongue 45 of the seal packing 4 is displaced inward in the radial direction, and atmospheric pressure is taken into the container main body 2, thereby generating a negative pressure in the container main body 2. Is prevented.
[0014]
In the stopper 1, the straight portion 43 extending linearly in the vertical direction is provided on the tongue 45 of the seal packing 4, so that when the seal packing 4 is formed, the mating surface 50 of the molding die is used. Can be formed by arbitrarily selecting one of the upper end and the lower end of the straight portion 43 that does not affect the water stoppage. By forming the seal packing 4 in this way, even if burrs occur along the mating surface 50 of the molding die, it is possible to substantially prevent the water stop function of the tongue piece 45 from being deteriorated by the burrs. it can.
[0015]
That is, in the form shown in FIGS. 1 and 2, when the stopper 1 is in the mounted state, the lower part of the straight part 43 and the tip part 44 of the tongue piece 45 are mainly on the upper surface of the reduced diameter part 24 of the inner container 21. The upper portion of the straight portion 43 of the tongue piece 45 is not in contact with the upper surface of the reduced diameter portion 24 and does not directly affect the water stop function. If the seal packing 4 is formed by positioning the die mating surface 50 at the portion corresponding to the upper surface of the reduced diameter portion 24, even if burrs are generated on the mating surface 50 portion, the upper surface of the reduced diameter portion 24 of the inner container 21 is pressed against the upper surface. A good water stop function can be obtained without generating burrs between the lower portion of the straight portion 43 of the tongue piece 45 and the tip portion 44.
[0016]
The length of the straight portion 43 is about 1 to 10 mm when applied to a thermos bottle with a mouth inner diameter of about 30 to 90 mm. If the length of the straight portion 43 is smaller than 1 mm, the effect of reducing the influence of the burr generation at the time of manufacturing as described above cannot be obtained sufficiently, and if the length of the straight portion 43 is larger than 10 mm, the tongue piece is straight. Even if the portion 43 is provided with a punch taper (less than 5 °), not only does the mold release from the mold deteriorate, the yield of the molding of the packing decreases, but the tongue piece 45 is pressed against the reduced diameter portion 24 of the inner container. In doing so, “wrinkles” are likely to occur in the tongue piece straight portion 43, which is not preferable because the sealing performance is lost and the water stop function is lowered.
[0017]
【The invention's effect】
As described above, the stopper of the liquid container according to the present invention is provided with the straight portion extending linearly in the vertical direction on the tongue piece of the seal packing, and the mating surface of the molding die is the upper end of the straight portion. By selecting any one of the lower ends, it is possible to arbitrarily select either one of the upper end and the lower end of the straight portion that does not affect the water stoppage. In addition, since burr can be managed to the extent that there are no defects in appearance, the seal packing with slight burr that was previously defective can be used as a non-defective product, improving yield and reducing seal packing cost. Is possible. In addition, since it is possible to reliably prevent a leakage failure that may occur even with a small burr, the sealing performance can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a stopper of a liquid container according to the present invention.
FIG. 2 is an enlarged sectional view of a seal packing of the same stopper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Plug, 2 ... Liquid container, 3 ... Shoulder member, 4 ... Seal packing, 24 ... Reduced diameter part, 41 ... Base part, 42 ... Hanging wall part, 43 ... Straight part, 44 ... ... the tip, 45 ... the tongue.

Claims (3)

A concave groove is provided on the outer peripheral portion of the plug body over the entire circumference, and an annular seal packing having a tongue piece protruding outward and downward is fitted in the concave groove, and the tongue piece receives the content liquid. in plug of the liquid container comprising a can pressed against the inner surface of the container body which stores the seal packing is die molding, the tongue is provided with a straight portion extending linearly toward the vertical direction, forming metal A stopper for a liquid container, wherein the mating surface of the mold is formed by selecting either the upper end or the lower end of the straight portion .   The seal packing includes a base part extending outward in the radial direction, a hanging wall part hanging from the lower surface side of the base part, a straight part extending linearly downward from the tip of the base part, and the 2. A stopper for a liquid container according to claim 1, further comprising a tongue piece having a tip portion extending from the straight portion to a position close to the hanging wall portion.   The stopper of a liquid container according to claim 2, wherein the seal packing is disposed so as to be in pressure contact with the upper surface of the reduced diameter portion formed on the inner side surface of the mouth portion of the container body.

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