Abstract 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.
A unit as defined in claim 1, wherein said user device is an electric bulb.
Claim 2
Dependent Claim
47 words
A unit as defined in claim 1, wherein said one end is open; further comprising a cap for said open end and being provided with said end wall; and cooperating retaining portions on said one end and said cap for releasably connecting the latter to the former.
Claim 3
Dependent Claim
15 words
A unit as defined in claim 3, wherein said retaining portions are mating screw threads.
Claim 4
Dependent Claim
17 words
A battery-operated unit as defined in claim 1 wherein said conductive metal sheet is a metal foil.
Claim 5
Dependent Claim
14 words
A unit as defined in claim 5, wherein said metal foil is aluminum foil.
Claim 6
Dependent Claim
16 words
A unit as defined in claim 5, wherein said foil is bonded to said foam material.
Claim 7
Dependent Claim
17 words
A battery-operated unit as defined in claim 1 wherein said conductive metal sheet is a metal coating.