| 摘要 |
<p>PURPOSE:To enhance reliability in safety and to provide an excellent external appearance by engaging a rectangular metal ring with a shallow bottom vessel, and integrally connecting the ring to the vessel. CONSTITUTION:A metal case 8 is composed of two pieces of a metal shallow bottom vessel 9 and a rectangular metal ring 10 in such a manner that the ring 10 is engaged inside the vessel 9. A method of connecting the ring 10 to the vessel 9 is not particularly limited, and employs adhering, welding, brazing, etc. The case 8 is composed of the integral vessel 9 from its bottom to its side, and the whole outer periphery of the ring 10 is restricted by the sidewall 9b of the vessel. Thus, the ring 10 and the vessel 9 which are bound are scarcely separated, and the connection is difficult to be intentionally broken. Adhesive or brazing material is not oozed. The material of the case is desirably formed of nonmagnetic stainless steel, titanium or titanium alloy due to the properties to be required for the case.</p> |
