Brush wear indicator

Details Brush wear indicator Brush wear indicator

1976-01-07

1977-05-17

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 6141, 310245, 340248E, 340282, G08B 2100

Patent

active

040245250

ABSTRACT:
A brush which presses against the commutator of a direct current machine has a groove in one side thereof into which a fixed probe partially extends. As the brush wears, movement thereof causes physical engagement of the probe with the end of the groove to complete a current path through the probe. Flow through the current path energizes and latches a warning device.

REFERENCES:
patent: 391554 (1888-10-01), Field
patent: 1251827 (1918-01-01), Schweitzer
patent: 1277394 (1918-09-01), Dean
patent: 1588087 (1926-06-01), Billingsley
patent: 1966057 (1934-07-01), Winkel
patent: 2590796 (1952-03-01), Schaffer
patent: 2691114 (1954-10-01), Lykins
patent: 2813208 (1957-11-01), Ritter
patent: 3523288 (1970-08-01), Thompson

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