Communications: electrical – Digital comparator systems
Patent
1975-05-07
1977-02-01
Caldwell, John W.
Communications: electrical
Digital comparator systems
340201P, 340266, 340271, 73384, 250231R, G08B 536
Patent
active
040064727
ABSTRACT:
The drive for the indicator mechanism of an altimeter is connected so as to drive altitude marker means, the relative position of such marker means being indicative of altitude. The marker means has a marker which may be implemented by a slot formed therein to reference this position. Sensor means is mounted in proximity to and for movement relative to the marker means. The sensor means is manually set to a position relative to the marker means by means of an altitude alert setting device, the set position representing an altitude at which an alerting signal is desired. When the marker means is driven by the altimeter mechanism so that the marker arrives opposite the sensor means, thus indicating that the marker means and the sensor means are both at positions representing the same altitude, a signal is generated by the sensor means which is used to appropriately actuate a signal device indicating that the alerting altitude has been reached.
REFERENCES:
patent: 2113947 (1938-04-01), Pottish
patent: 2329715 (1943-09-01), Grier
patent: 2491591 (1949-12-01), Sweeny et al.
patent: 3043580 (1962-07-01), Angus
patent: 3513708 (1970-05-01), Springer
patent: 3633835 (1972-01-01), Beers
patent: 3815420 (1974-06-01), Springer
patent: 3916185 (1975-10-01), Jehly
Caldwell John W.
Groody James J.
Safe Flight Instrument Corporation
Sokolski Edward A.
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