Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Meter protection or fraud combatting
Patent
1975-06-09
1978-03-21
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Meter protection or fraud combatting
73358, 340253A, G01R 136
Patent
active
040805670
ABSTRACT:
A heat sensitive abnormal current condition detecting and indicating device associated with a watthour meter indicates that a possibly damaging surge has been experienced by the meter. The abnormal condition detecting and indicating device includes indicator means retained in normal position by a heat sensitive material, such as solder, with the indicator means being biased to move from the normal position to an abnormal condition position should the conductor being monitored experience a heat rise sufficient to soften the heat sensitive material and release the indicator means. A plurality of embodiments of the heat sensitive abnormal condition detecting and indicating device are shown including a rod maintained in normal position within a tube under spring bias with the rod being movable longitudinally to thereafter extend from the tube to indicate a possible abnormality when a monitored conductor experiences a heat rise sufficient to melt solder holding the rod in normal position, a flag mounted on a rotatable wheel and rod assembly maintained in a rotational normal position with a spring bias thereon so that the wheel and rod assembly rotates to a position wherein the flag indicates an abnormal condition when a monitored conductor experiences a heat rise sufficient to melt solder holding the wheel and rod assembly in normal position, and a spring arm held against the monitored conductor by means of solder so that a possibly damaging surge experienced sufficient to heat the conductor and melt the solder frees the spring load arm to spring outwardly for visually indicating that a possible abnormal condition has occurred.
REFERENCES:
patent: 1387890 (1921-08-01), Kleidman
patent: 1443786 (1923-01-01), Dolph
patent: 1935093 (1933-11-01), Keller
patent: 1994222 (1935-03-01), Le Roy
patent: 2094293 (1937-09-01), Dupont
patent: 3140611 (1964-07-01), Kliewer
Carr John M.
Kemp Wallace C.
Duncan Electric Company, Inc.
Karlsen Ernest F.
Nesbitt John R.
Rolinec Rudolph V.
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