JPH0460491A - Water proof casing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glass fixing structure in a waterproof case used for a wristwatch, table clock, small television, word processor, personal computer, etc.

[Prior Art] A typical structure of a conventional waterproof case, here the structure of a wristwatch case, is shown in FIG. In FIG. 3, the glass 2 is fixed to the case 1 with a resin gasket 3 interposed therebetween. Here, the packing contact surface 4, which is the outer periphery of the glass 2, has a straight shape, and the interference when press-fitting the glass 2 is determined by the materials and shapes of the case 1 and the resin packing 3.

[Problems to be Solved by the Invention] The waterproof case with the conventional structure as described above has problems in waterproofness and long-term reliability in maintaining the glass fixing force. The reason for this is that especially when the material of the case 2 is synthetic resin, the waterproofness after being left in a high temperature atmosphere due to creep may deteriorate.
The glass fixing force may be significantly reduced.

Therefore, the present invention is intended to solve these conventional problems, and its purpose is to provide a waterproof product that ensures long-term reliability in terms of waterproofness and maintenance of glass fixing force using a simple and inexpensive manufacturing method. The purpose is to provide a case.

[Means for Solving the Problems] The waterproof case according to the present invention has glass 2 for case 1.
This waterproof case has a structure in which the glass 2 is fixed using the elastic force of the resin gasket 3, and is characterized in that the cross-sectional shape of the gasket contact surface 4, which is the outer peripheral portion of the glass 2, is curved.

[Example] Embodiments according to the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing an embodiment of a waterproof case for a wristwatch according to the present invention. In Figure 1, case 1 is made of metal or synthetic wood BH, and must have enough strength to withstand the repulsion force when glass 2 is press-fitted, and if it is made of synthetic resin, it is usually reinforced with glass fiber, etc. The materials used are The glass 2 is usually made by cutting the outer periphery of a flat plate of inorganic glass, and is press-fitted into the case 1 with an appropriate tightening margin using the elastic force of the resin packing 3 to achieve the required waterproofness and Glass fixing force is ensured. The interference here tends to be set smaller as the elastic modulus of the material of the case 1 increases. Resin packing 3 is often made by molding a soft synthetic resin material, and to improve waterproofness, it is better to reduce the hardness of the material, and to improve the glass fixing force, it is better to increase the hardness. It's trending well. Here, the cross-sectional shape of the packing contact surface 4, which is the outer peripheral part of the glass 2 in FIG. This prevents a decrease in the glass fixing force and waterproofness. In addition, in terms of ease of assembly, the curved shape allows the glass 2 to be press-fitted smoothly, and it can be said that it is easier to assemble than the conventional straight shape.

Furthermore, in terms of economy, the conventional straight shape can be changed by simply changing the shape of the cutting tool when manufacturing the glass 2, so that the cost does not increase. Therefore, there is provided a waterproof case that has long-term reliability in terms of waterproofness and retention of glass fixing force by a simple and inexpensive manufacturing method.

FIG. 2 is a sectional view of a waterproof case for a wristwatch according to another embodiment of the present invention. In FIG. 2, the cross-sectional shape of the packing contact surface 4 on the outer periphery of the glass 2 is a curved surface, and here the curved surface is formed by a plurality of circular arcs. In the present invention, the number and direction of circular arcs are not specified.

[Effects of the Invention] As described above, according to the present invention, the cross-sectional shape of the packing contact surface, which is the outer periphery of the glass, is curved, so that the case is sufficiently simple compared to known waterproof cases of the same type. Moreover, a waterproof case is provided which ensures long-term reliability in terms of waterproofness and maintenance of glass fixing force using an inexpensive manufacturing method.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a waterproof case for a wristwatch according to an embodiment of the present invention. FIG. 2 is a sectional view of a waterproof case for a wristwatch according to another embodiment of the present invention. FIG. 3 is a sectional view of a waterproof case according to the prior art. 1... Case 2... Glass 3... Resin packing 4... Packing contact surface

Claims (1)

[Claims] A waterproof case in which a glass is fixed to a case using the elastic force of a resin packing, characterized in that a cross-sectional shape of a packing contact surface, which is an outer peripheral part of the glass, is curved.