Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-10-05
1985-12-17
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
324133, 34081524, G08B 2100
Patent
active
045595305
ABSTRACT:
An overcurrent condition display suspended directly from a distribution cable for displaying overcurrent conditions in the cable and for promptly locating spots of accidents due to overcurrent conditions comprises a current sensor section having a current transformer, a drive section provided with a drive element adapted to be driven by the sensed overcurrent and with a force storage member adapted to be actuated by the drive element and to act as a restoring member as well for the drive element, a drive-transmission section actuated by the force storage member and a display section having a display tube with a transparent bottom, a viscous fluid stored in the tube and a display element connected to the drive-transmission section for vertical motion through the fluid. The overcurrent condition is displayed when the display element is hoisted by the drive-transmission section. The display of the normal condition is established when the display element has descended slowly under the influence of its own gravity and the viscosity resistance of the fluid in a prolonged time interval.
REFERENCES:
patent: 699140 (1902-05-01), Blake
patent: 2432875 (1947-12-01), Flint
patent: 3253215 (1966-05-01), Moakler et al.
patent: 3419791 (1968-12-01), Mishkovsky
patent: 4079368 (1978-03-01), DiStefano
Ishigure Masao
Kudomi Mitsuharu
Ota Mitsuo
Takaoka Naotoshi
Myer Daniel
Rowland James L.
Takamatsu Electric Works, Ltd.
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