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US 3,932,812 AGranted
Motor speed indicator
AssigneePeripheral Equipment Corporation
InventorLee J. Milligan
Life of this patent
Estimating the term…
Abstract
Apparatus for indicating when a change has taken place in a desired operating condition of a device using retriggerable multivibrators which are adjusted to represent particular periods with respect to the desired operating rate of the device. In the case of a motor, the multivibrators indicate when the motor is operating at, below or above a desired operating speed.
Claims8
Apparatus for indicating whether a motor is operating out of speed, comprising:
- a slow speed detector;
- a high speed detector;
- and
- an indicator unit;
- said slow speed detector including a first retriggerable multivibrator having a time period greater than the desired operating speed, and a second retriggerable multivibrator having a time period greater than that of said first multivibrator to provide a slow speed indicator signal for said indicator unit;
- and said high speed detector including a third retriggerable multivibrator having a time period less than said desired operating speed, a fourth retriggerable multivibrator coupled to said third multivibrator and having a time period greater than said desired operating speed, and a fifth multivibrator coupled to said fourth multivibrator and having a time period greater than that of said fourth multivibrator to provide a high speed indicator signal for said indicator unit.
3 more elements
Dependencies are inferred from the claim text.