| 摘要 |
A battery-operated unit has a casing one of whose opposite ends is provided with an end wall. At least one battery is received in the casing and has two spaced contacts of opposite polarity one of which faces the endwall. Conductive means contacts the other pole and extends to the region of the end wall. An element composed of synthetic plastic foam material, either made electrically conductive by embedding of metallic material, or metallic coated or metallically wrapped completely or in part, is elastically compressed between the battery and the end wall and in conductive contact with the aforementioned one pole and with the conductive means. A switch is provided in the thus established circuit for opening and closing the same as desired, and an electrical user device is also connected in the circuit, such as a light bulb, a radio receiver, a motor or the like.
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