Patent US3755726A successfully refreshed from Google Patents.
US3755726A
Expired / Lapsed
US
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Closed loop motor controlled condition responsive system
Assignee: Continental Can Co Inc
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Filing: 1971-05-20
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Granted: 1973-08-28
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Expires: 1991-05-20
Abstract
Abstract A condition responsive detection system having a feedback servo control to adjust the system response to compensate for normal operational variations in the monitored condition. The detection system includes a strain gauge transducer providing an analog output signal coupled as one input to a differential amplifier which receives a second input through a potentiometer adjustable in response to a stepper motor. The AC signal from the transducer is compared to a DC voltage established by the adjustable resistor and the differential portion of the signal is amplified and coupled to a network of Schmitt triggers, each firing OneShot or Monostable multivibrators when the threshold level has been reached. The output from the Schmtt trigger actuated multivibrators is coupled to suitable indicators and the stepper motor to adjust the variable resistor for changing the established DC voltage level to compensate for normal operational variations included in the output from the strain gauge transducer.
Inventors
- 👤 L Knipe
- 👤 C Furra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
B; B23; B23Q; B23Q15/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
134 words
A condition responsive detection system comprising condition responsive means for monitoring a condition and providing an output signal in response thereto, means for receiving and comparing said output signal to a predetermined reference signal, said receiving and comparing means providing an actuating signal of a magnitude determined by the differential between the output signal received and said predetermined reference signal, threshold detector means for receiving said actuating signal and providing enabling signals when the level of the actuating signal exceeds a thresholD level thereof comprising, a plurality of Schmitt triggers having predetermined threshold detecting levels, at least one of said plurality of Schmitt triggers having a threshold level different than any others of said plurality, means coupled to said enabling signals actuable in response thereto for establishing the level of said predetermined reference signal.
Claim 2
Dependent Claim
134 words
A condition responsive detection system comprising condition responsive means for monitoring a condition and providing an output signal in response thereto, means for receiving and comparing said output signal to a predetermined reference signal, said receiving and comparing means providing an actuating signal of a magnitude determined by the differential between the output signal received and said predetermined reference signal, threshold detector means for receiving said actuating signal and providing enabling signals when the level of the actuating signal exceeds a thresholD level thereof comprising, a plurality of Schmitt triggers having predetermined threshold detecting levels, at least one of said plurality of Schmitt triggers having a threshold level different than any others of said plurality, means coupled to said enabling signals actuable in response thereto for establishing the level of said predetermined reference signal.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 wherein said condition responsive means provides an analog output signal to said means for receiving and comparing said output signal to a predetermined reference signal.
Claim 4
Dependent Claim
15 words
The apparatus of claim 2 wherein said condition responsive means comprises a strain gauge transducer.
Claim 5
Dependent Claim
24 words
The apparatus of claim 3 wherein said strain gauge transducer is carried by a strain amplifier operatively connected to means for defining a condition.
Claim 6
Dependent Claim
23 words
The apparatus of claim 4 wherein said strain gauge transducer is carried by a portion of said strain amplifier wherein strain is concentrated.
Claim 7
Dependent Claim
24 words
The apparatus of claim 1 wherein said means for receiving and comparing said output signal to a predetermined reference signal comprises a differential amplifier.
Claim 8
Dependent Claim
48 words
The apparatus of claim 2 wherein said means for receiving and comparing said output signal to a predetermined reference signal comprises a differential amplifier having coupled thereto as one input the analog output signal from said condition responsive means and as a second input said predetermined reference signal.
Claim 9
Dependent Claim
18 words
The apparatus of claim 1 wherein said threshold detecting means have at least three discrete threshold detecting levels.
Claim 10
Dependent Claim
44 words
The apparatus of claim 1 wherein said means coupled to said enabling signal actuable in response thereto for establishing the level of said predetermined reference signal includes a stepper motor operatively connected to a potentiometer for increasing or decreasing the reference signal established thereby.
Claim 11
Dependent Claim
33 words
The apparatus of claim 1 further including indicator means coupled to said threshold detector means for receiving said enabling signals and actuable thereby to indicate when a threshold level thereof has been exceeded.
Claim 12
Dependent Claim
36 words
The apparatus of claim 1 further including means coupled to said threshold detector means for receiving said enabling signals to terminate the monitored condition upon the level of said actuating signals exceeding a threshold level thereof.
Claim 13
Dependent Claim
25 words
The apparatus of claim 10 wherein said means for indicating when a threshold level of said threshold detector means has been exceeded includes a counter.
Claim 14
Dependent Claim
103 words
A condition responsive detection system comprising condition responsive means for monitoring a condition and providing an analog output signal in response to said condition, means for comparing said output signal to an established reference signal thereby producing an actuating signal of a level determined by the differential therebetween, a plurality of Schmitt trigger threshold level detectors having discrete threshold levels coupled to said actuating signal to provide enabling signals in response to the level thereof, control logic means for receiving said enabling signals and generating command signals in response thereto, and means for receiving said command signals actuable to establish said reference signal.
Claim 15
Dependent Claim
103 words
A condition responsive detection system comprising condition responsive means for monitoring a condition and providing an analog output signal in response to said condition, means for comparing said output signal to an established reference signal thereby producing an actuating signal of a level determined by the differential therebetween, a plurality of Schmitt trigger threshold level detectors having discrete threshold levels coupled to said actuating signal to provide enabling signals in response to the level thereof, control logic means for receiving said enabling signals and generating command signals in response thereto, and means for receiving said command signals actuable to establish said reference signal.
Claim 16
Dependent Claim
22 words
The apparatus of claim 13 wherein said means for receiving said command signals includes a potentiometer adjustable to vary said reference signal.
Claim 17
Dependent Claim
18 words
The apparatus of claim 13 wherein said control logic means includes coincidence means for receiving said enabling signals.
Claim 18
Dependent Claim
24 words
The apparatus of claim 13 wherein said control logic means includes pulse generators selectively actuable by said enabling signals to generate said command signals.
Claim 19
Dependent Claim
139 words
A condition responsive detection system comprising a strain gauge transducer means for providing an analog output signal in response to strain occurring therein, a differential amplifier having said output signal coupled thereto as One input and a second input coupled thereto establishing a reference signal for comparing with said strain gauge output signal to thereby provide an actuating signal of a magnitude dependent on the differential therebetween, a plurality of Schmitt triggers for receiving said actuating signal and triggering monostable multi-vibrators coupled thereto when the actuating signal from said differential amplifier reaches the threshold level of said triggers, pulse generators coupled to the output from said monostable multivibrators controlling the energization of a stepper motor coupled thereto, and a potentiometer operatively connected to said stepper motor for adjustment thereby to establish said reference signal coupled to said differential amplifier.
Claim 20
Dependent Claim
139 words
A condition responsive detection system comprising a strain gauge transducer means for providing an analog output signal in response to strain occurring therein, a differential amplifier having said output signal coupled thereto as One input and a second input coupled thereto establishing a reference signal for comparing with said strain gauge output signal to thereby provide an actuating signal of a magnitude dependent on the differential therebetween, a plurality of Schmitt triggers for receiving said actuating signal and triggering monostable multi-vibrators coupled thereto when the actuating signal from said differential amplifier reaches the threshold level of said triggers, pulse generators coupled to the output from said monostable multivibrators controlling the energization of a stepper motor coupled thereto, and a potentiometer operatively connected to said stepper motor for adjustment thereby to establish said reference signal coupled to said differential amplifier.
Claim 21
Dependent Claim
73 words
The apparatus of claim 17 wherein said strain gauge transducer means includes a mechanical strain amplifier having a predetermined length adapted to be secured to means for defining a strain condition, said strain amplifier having a stepped portion reduced to form an area of stress concentration, a strain gauge transducer fixed to said strain amplifier at said stress concentration area, and means for fixing said strain amplifier to said strain condition defining means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |