Patent US3564337A successfully refreshed from Google Patents.
US3564337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor overload control circuit for material testing machine
Assignee: Thwing Albert Instrument Co Inc
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Filing: 1968-12-16
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Granted: 1971-02-16
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Expires: 1988-12-16
Abstract
Abstract There is provided a system which is used to control the operation of a material testing machine. The system includes a circuit which controls the speed of the motor that operates the testing machine and a control circuit which produces a control signal in response to an abnormal load condition whereby the motor can be turned off.
Inventors
- 👤 William D Macgeorge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:27
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/291; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A control syStem comprising: signal generating means, amplifier means connected to said signal generating means, means for supplying a variable reference potential, said last named means connected to said amplifier means such that the operation of said amplifier means is determined as a function of the relative magnitudes of the signal supplied by said signal generating means and the potential supplied by said reference potential supplying means, output means controlled by said amplifier means, overload protection means for selectively inactivating said amplifier means when said output means approaches overload conditions, common reference means connected to each of the enumerated means to prevent spurious signals from being detected, said overload protection means including a silicon controlled switch, energy storage means, said silicon controlled switch being connected to said energy storage means and operative to be triggered when said energy storage means stores a predetermined energy magnitude, and said energy storage means being connected to said output means to store energy as a function of the current in said output means.
Claim 2
Dependent Claim
169 words
A control syStem comprising: signal generating means, amplifier means connected to said signal generating means, means for supplying a variable reference potential, said last named means connected to said amplifier means such that the operation of said amplifier means is determined as a function of the relative magnitudes of the signal supplied by said signal generating means and the potential supplied by said reference potential supplying means, output means controlled by said amplifier means, overload protection means for selectively inactivating said amplifier means when said output means approaches overload conditions, common reference means connected to each of the enumerated means to prevent spurious signals from being detected, said overload protection means including a silicon controlled switch, energy storage means, said silicon controlled switch being connected to said energy storage means and operative to be triggered when said energy storage means stores a predetermined energy magnitude, and said energy storage means being connected to said output means to store energy as a function of the current in said output means.
Claim 3
Dependent Claim
236 words
A control system comprising: a signal generating means, amplifier means connected to said signal generating means, means for supplying a variable reference potential, said last named means connected to said amplifier means such that the operation of said amplifier means is determined as a function of the relative magnitudes of the signal supplied by said signal generating means and the potential supplied by said reference potential supplying means, output means controlled by said amplifier means, overload protection means for selectively inactivating said amplifier means when said output means approaches overload conditions, common reference means connected to each of the enumerated means to prevent spurious signals from being detected, said overload protection means comprising load cell means, power supply means connected to said load cell means, second amplifier means having first and second input terminals, said load cell means being connected to said first input terminal of said second amplifier means, feedback means connected between the output of said second amplifier means and said second input terminals, first switch means connected to said output of said second amplifier means and selectively rendered conductive in accordance with the magnitude of the signal produced by said second amplifier means, second switch means connected to said first switch means and selectively rendered conductive in accordance with the magnitude of the signal produced by said first switch means, and further output means selectively connected to said first and second switch means.
Claim 4
Dependent Claim
236 words
A control system comprising: a signal generating means, amplifier means connected to said signal generating means, means for supplying a variable reference potential, said last named means connected to said amplifier means such that the operation of said amplifier means is determined as a function of the relative magnitudes of the signal supplied by said signal generating means and the potential supplied by said reference potential supplying means, output means controlled by said amplifier means, overload protection means for selectively inactivating said amplifier means when said output means approaches overload conditions, common reference means connected to each of the enumerated means to prevent spurious signals from being detected, said overload protection means comprising load cell means, power supply means connected to said load cell means, second amplifier means having first and second input terminals, said load cell means being connected to said first input terminal of said second amplifier means, feedback means connected between the output of said second amplifier means and said second input terminals, first switch means connected to said output of said second amplifier means and selectively rendered conductive in accordance with the magnitude of the signal produced by said second amplifier means, second switch means connected to said first switch means and selectively rendered conductive in accordance with the magnitude of the signal produced by said first switch means, and further output means selectively connected to said first and second switch means.
Claim 5
Dependent Claim
30 words
The control system recited in claim 2 wherein: said first and second switch means comprise transistor means, and source means connected to said transitor means and said second amplifier means.
Claim 6
Dependent Claim
23 words
The control system recited in claim 2 including: unilaterally conductive means connected between each of said switch means and said further output means.
Claim 7
Dependent Claim
27 words
The control system recited in claim 2 including: indicating means connected to said load cell means to indicate the status and condition of the signal produced thereby.
Claim 8
Dependent Claim
23 words
The control system recited in claim 2 including: means connected to said load cell to selectively adjust the reference signal level supplied thereto.
Claim 9
Dependent Claim
119 words
In combination: load cell means, power supply means connected to said load cell means, amplifier means having first and second input terminals, said load cell means being connected to said first input terminal of said amplifier means, feedback means connected between the output of said amplifier means and said second input terminal, first switch means connected to said output of said amplifier means and selectively rendered conductive in aCcordance with the magnitude of the signal produced by said amplifier means, second switch means connected to said first switch means and selectively rendered conductive in accordance with the magnitude of the signal produced by said first switch means, and output means selectively connected to said first and second switch means.
Claim 10
Dependent Claim
119 words
In combination: load cell means, power supply means connected to said load cell means, amplifier means having first and second input terminals, said load cell means being connected to said first input terminal of said amplifier means, feedback means connected between the output of said amplifier means and said second input terminal, first switch means connected to said output of said amplifier means and selectively rendered conductive in aCcordance with the magnitude of the signal produced by said amplifier means, second switch means connected to said first switch means and selectively rendered conductive in accordance with the magnitude of the signal produced by said first switch means, and output means selectively connected to said first and second switch means.
Claim 11
Dependent Claim
28 words
The combination recited in claim 6 wherein: said first and second switch means comprise transistor means, and source means connected to said transistor means and said amplifier means.
References Cited (Backward Citations)
US3251483A
Cited
US3465227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |