Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-06-15
1980-01-22
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
324167, 324174, 340 62, G01P 348, G08B 2100
Patent
active
041852796
ABSTRACT:
A detector for a movalbe member such as a rotatable shaft includes a sensor and an alarm having a normal and a signaling condition. The sensor includes one or more magnetic pole pieces attached to the shaft whose rotational speed is to be detected, to rotate in unison therewith, and a pick-up including a coil mounted adjacent the shaft for producing an electrical signal in response to the rotating magnetic pole pieces. An electrical circuit is provided, connected between the coil and the alarm for switching the alarm between its normal and signaling conditions in response to a predetermined value of the electrical signal. The position of the coil with respect to the shaft and magnetic pieces is adjustable for selectively producing the predetermined switching value of the electrical signal in response to different rotational speeds of the shaft.
REFERENCES:
patent: 3182498 (1965-05-01), Koletsky et al.
patent: 3614615 (1971-10-01), Cass
patent: 3701015 (1972-10-01), Dittman
patent: 3721968 (1973-03-01), Gee
patent: 3732494 (1973-05-01), Dragon
patent: 3890517 (1975-06-01), Marsh et al.
Caldwell Sr. John W.
Dickey-john Corporation
Nowicki Joseph E.
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