| 摘要 |
A conventional steel case with drawers or a cash container are placed on an elevating system placed in a container below ground level. An outer shell of the container comprises armored, high strength and water proof concrete and an inner shell of the container comprises galvanized steel plate and the container is covered by a three layer armored cover plate. The cover plate has an upper layer of jointless connected steel segments or of a compact high hardness cast iron plate and prevents drilling and cutting with portable tools. The intermediate layer of copper plate renders impossible the use of cutting burners. A lower layer of an asbestos containing insulating plate protects the contents of the disappearing underground safe from heat in case of fire. Safety switches for the power of the motor and the actuation of the motor and a built in alarm system provide additional protection.
|
