| 摘要 |
PURPOSE:To improve the assembling property along with a proper strength against an external force by fitting a back lid into a body made of a stretchable material such as polyurethane and polyester elastomer to make a wrist watch fit on a wrist. CONSTITUTION:A body 7 and a bond 8 are made integral of a stretchable material such as polyurethane rubber, polyester elastomer and silicone rubber and holes 2 and 6 are made on the back of the body 7. In addition, projections 3 and 5 are formed on the back lid 4. The body 7 and the back lid 4 are fixed by fitting the projections 3 and 5 into the holes 2 and 6 and a glass 1 is places to form a case. As a tension force is transmitted to the projections 3 and 5 through the holes 2 and 6 of the body 7 regardless of tension force working on the case, external force is received not only by the body 7 but also the case. Thus, the reinforcement by the body 7 and the back lid 4 prevents the peeling of the glass to protect interior parts and the use of the stretchable material makes itself fit on a wrist. |
