JPH068867U - Waterproof packing for small cases - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to completely seal the opening of the small case. [Structure] An airtight tube 2 made of an elastic member such as rubber having a uniform thickness T and having an annular shape along a sealing surface G1 of an opening of a container G, and a portion 3 of the thickness T
The bulging portion 4 having a thinner wall thickness t is provided, and the internal pressure generated by the compression of the thin wall portion is spread over the entire airtight tube 2 for sealing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a waterproof packing for a small case.

[0002]

[Prior art]

 When waterproofing the joint between the opening and the lid of a small case having an opening, the lid is closed by interposing seal packing of various cut surfaces. By the way, in the case of a small case, the gap between the opening and the lid is often very narrow, and accordingly, the waterproof packing is also made of a thin elastic material.

[0003]

[Problems of conventional technology]

 However, no matter how excellent the elastic modulus is, if the wall thickness is thin, the elasticity at the time of sealing cannot be sufficiently obtained, and the amount of compression becomes insufficient, resulting in a problem that the waterproof sealing property deteriorates during long-term use.

In order to solve such a problem, for example, as disclosed in JP-A-49-7643 and JP-A-51-79858, a fluid is enclosed inside and the fluid pressure is utilized to make the fluid uniform. It has been proposed to obtain a good sealing property, but if a fluid containing gas is injected from the outside after packing is inserted to obtain the required sealing pressure (for example, Japanese Patent Laid-Open No. 49-7643), the inlet should be sealed. There is a problem that the structure is required and the implementation is troublesome, and the structure of the seal packing is complicated, and there is a problem that it is difficult to implement in a small case. In Japanese Patent Laid-Open No. 51-79858), even if a very narrow gap is to be sealed, the sealing pressure of the fluid is too high and reliable sealing performance can be obtained, but the lid closing pressure of the container must be greatly increased. Without a small case, the strength is Bending deformation of the seal portion is a drawback that a cause inconvenience caused by.

[0005]

In view of the above problems, the present invention ensures that even if the sealing surface of a small container has a very narrow gap, it does not apply an excessive lid closing pressure to the container and is reliable. The purpose of the invention is to provide a waterproof packing for a small case that can be sealed.

[0006]

[Means for Solving the Problems]

 That is, the waterproof packing for a small case of the present invention is an airtight tube 2 made of an elastic member having a uniform thickness T, which is annular along the sealing surface G1 of the opening of the container G. Is provided with a bulging portion 4 thinner than the wall thickness T.

[0007]

【Example】

 Next, an embodiment of this invention will be described. FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of the embodiment, FIG. 3 is a sectional view of an essential part in a use state, and FIG. 4 is a sectional view of another embodiment.

The waterproof packing 1 for a small case of the present invention has an annular shape along the sealing surface G1 of the opening of the container G, and an airtight tube 2 made of an elastic material such as rubber having a uniform wall thickness T. The bulging portion 4 having a wall thickness t smaller than the wall thickness T is provided in the part 3.

The length n and the bulge amount m of the thin bulging portion 4 in the above-described embodiment are appropriately selected depending on the length and gap of the sealing surface G1. Generally, n is the total length N of the sealing surface. About 10%, and m is about 10% of the diameter of the airtight tube 2. Further, as shown in FIG. 4, the airtight tube 2 may be integrally provided with a lip or a fin 2A corresponding to the sealing surface.

[0010]

[Action]

 The small case waterproof packing 1 of the present invention is arranged along the opening sealing surface G1 of the container G, and is inserted into the sealing surface by closing the lid G2. At this time, the thin bulging portion 4 is compressed and deformed before the other portions of the airtight tube 2, so that the compression pressure at this time is spread over the entire tube 2.

Therefore, when the thin bulging portion 4 functions as a pump to improve the pressure of the entire tube and the lid G2 is completely closed, the sealing surface between the container opening surface and the lid is a thin bulging portion. It is properly sealed by the pressure generated by the compression of. In addition, the sealing of the container is achieved by the elasticity of the tube itself and the pressure of the gas or the like enclosed inside, so there is no deterioration of the sealing property due to plastic deformation such as the set of rubber material.

[0012]

[Effect of device]

 As described above, in this invention, the thin bulging portion 4 is provided in a part of the airtight tube 2, and the increase in pressure when this part is compressed and deformed is spread over the entire tube to seal. An appropriate sealing pressure can be maintained over the entire seal, and the sealing fluid pressure such as air is used for sealing, so that the entire sealing surface can be kept at a uniform pressure and stable sealing can be achieved over a long period of time. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment.

FIG. 3 is a cross-sectional view of a main part in a use state.

FIG. 4 is a cross-sectional view of another embodiment.

[Explanation of symbols]

 1 Waterproof packing for small case 2 Airtight tube 3 Part 4 Swelling part G Container G1 Sealing surface required

Claims (1)

[Scope of utility model registration request] 1. An airtight tube 2 formed of an elastic member having a uniform wall thickness T and having an annular shape along a sealing surface G1 of an opening of a container G. A waterproof packing for a small case, which is provided with a projecting portion 4.