Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Meter protection or fraud combatting
Patent
1990-12-18
1992-08-18
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Meter protection or fraud combatting
340568, G01R 1124
Patent
active
051402580
ABSTRACT:
A disposable tamper detection device for electricity meters of the type having a meter housing with current-carrying blades protruding therefrom for insertion into a meter socket, comprises a non-conductive board-like member having a pair of slots adapted to fit over a pair of respective protruding current-carrying blades so as to bridge them. Terminals establish contact with the pair of protruding blades. A fuse and current limiting device are connected in series between the terminals. The current limiting device limits the current flow through the fuse to a sufficiently low level to prevent the fuse from blowing under normal conditions. A switch, spring biased into the closed position, is connected in parallel with the current limiting device. The switch means has a retainer adapted to be engaged by the meter when fully inserted into its socket to retain the switch in the open position against the spring bias. A releasable retainer for retains the switch in the normally open position during insertion of the meter into its receiving socket and releases the switch means after such insertion. Upon partial removal of the meter from its receiving socket the switch means closes under its spring bias, thereby blowing said fuse and establishing a record of the partial removal of the meter from its receiving socket.
REFERENCES:
patent: 693688 (1902-02-01), Claypoole
patent: 999196 (1911-08-01), Berardi
patent: 4039943 (1977-08-01), Tapcott
patent: 4150371 (1979-04-01), Scaglione
patent: 4386313 (1983-05-01), Venaas et al.
patent: 4386314 (1983-05-01), Becker
patent: 4588949 (1986-05-01), Becker et al.
Karlsen Ernest F.
Micro-Port International Ltd.
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