Patent US3678742A successfully refreshed from Google Patents.
US3678742A
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Tolerance checking system
Assignee: TRANS SONICS Inc
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Filing: 1970-10-05
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Granted: 1972-07-25
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Expires: 1990-10-05
Abstract
Abstract A tolerance checking system enables one to quickly verify whether or not a given primary parameter is within tolerance limits which are functions of one or more other secondary parameters. The system measures the values of the secondary parameters and uses these as inputs to function generators to generate corresponding upper and lower limit values of the primary parameter. The outputs of the function generators are connected to a meter by way of a three-position switch, with the upper limit output being applied to the meter when the switch is in its upper position and the lower limit output being fed to the meter in the lower switch position. Another sensor which measures the actual value of the primary parameter is connected to the meter when the switch is in its middle position. In order to check whether the primary parameter is within the allowable limits, the operator sets the switch in the middle position so that the actual value of the primary parameter is shown in the meter. Then he flips the switch to the upper and lower positions. The directions of movement of the meter pointer when the switch is actuated indicate whether the primary parameter is within tolerance limits.
Inventors
- 👤 Vernon C Westcott
- 👤 Byron E Blanchard
- 👤 Paul A Davis
- 👤 Stephane Prevot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:06
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/11; F; F02; F02C; F02C7/00
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
124 words
A tolerance checking system comprising A. a first sensor for sensing a first variable parameter, B. a function generator responsive to the output of the sensor for generating a limitation value of a second variable parameter in terms of said first variable parameter, C. a second sensor for sensing the actual value of the second parameter, D. an indicator responsive to the outputs of the function generator and the second sensor, and E. means for applying the outputs of the function generator and second sensor alternatively to the indicator so that the actual second parameter value can be compared with the limitation on the second parameter by observing the change in the indication of the indicator when the inputs of the indicator are alternated.
Claim 2
Dependent Claim
124 words
A tolerance checking system comprising A. a first sensor for sensing a first variable parameter, B. a function generator responsive to the output of the sensor for generating a limitation value of a second variable parameter in terms of said first variable parameter, C. a second sensor for sensing the actual value of the second parameter, D. an indicator responsive to the outputs of the function generator and the second sensor, and E. means for applying the outputs of the function generator and second sensor alternatively to the indicator so that the actual second parameter value can be compared with the limitation on the second parameter by observing the change in the indication of the indicator when the inputs of the indicator are alternated.
Claim 3
Dependent Claim
41 words
A tolerance checking system as defined in claim 1 A. wherein the indicator comprises a meter having a pointer and a scale, and B. the comparison is made by observing the direction of movement of the meter pointer on the scale.
Claim 4
Dependent Claim
11 words
the engine speed upper limit for any given engine inlet temperature,
Claim 5
Dependent Claim
11 words
the engine speed upper limit for any given engine inlet temperature,
Claim 6
Dependent Claim
11 words
the exhaust gas temperature upper limit for any given engine speed
Claim 7
Dependent Claim
11 words
the exhaust gas temperature upper limit for any given engine speed
Claim 8
Dependent Claim
65 words
responsive to the output of the function generator for producing a signal whose frequency varies with changes in the output of the sensor, B. in which the second sensor generates an output frequency which varies in accordance with changes in the second parameter value, and C. the indicator is a frequency responsive meter, whose indication varies in accordance with the frequency applied to the meter.
Claim 9
Dependent Claim
65 words
responsive to the output of the function generator for producing a signal whose frequency varies with changes in the output of the sensor, B. in which the second sensor generates an output frequency which varies in accordance with changes in the second parameter value, and C. the indicator is a frequency responsive meter, whose indication varies in accordance with the frequency applied to the meter.
Claim 10
Dependent Claim
13 words
the exhaust gas temperature lower limit for the same engine speed condition, and
Claim 11
Dependent Claim
13 words
the exhaust gas temperature lower limit for the same engine speed condition, and
Claim 12
Dependent Claim
12 words
the engine speed lower limit for the same input temperature condition, and
Claim 13
Dependent Claim
12 words
the engine speed lower limit for the same input temperature condition, and
Claim 14
Dependent Claim
13 words
A tolerance checking system in accordance with claim 1, A. further including means
Claim 15
Dependent Claim
184 words
an operator is thereby able to quickly verify that his actual engine speed is within the upper and lower speed limits by manipulating the switching means between its various positions and observing the direction of movement of the meter pointer, G. a third function generator responsive to the output of the tachometer generator for producing an output signal corresponding to the exhaust gas temperature upper limit for the existing engine speed, H. a fourth function generator responsive to the output of the tachometer generator for producing an output signal corresponding to the exhaust gas temperature lower limit for the existing engine speed, I. a second temperature sensor at the engine outlet said sensor producing an electrical output corresponding to the temperature at that location, J. a second meter controlled by the output of the second sensor and the outputs of the third and fourth function generators, and K. second means for switching the outputs of the third and fourth function generators and the second sensor selectively to the second meter so that in different positions of the second switching means, the second meter indicates
Claim 16
Dependent Claim
184 words
an operator is thereby able to quickly verify that his actual engine speed is within the upper and lower speed limits by manipulating the switching means between its various positions and observing the direction of movement of the meter pointer, G. a third function generator responsive to the output of the tachometer generator for producing an output signal corresponding to the exhaust gas temperature upper limit for the existing engine speed, H. a fourth function generator responsive to the output of the tachometer generator for producing an output signal corresponding to the exhaust gas temperature lower limit for the existing engine speed, I. a second temperature sensor at the engine outlet said sensor producing an electrical output corresponding to the temperature at that location, J. a second meter controlled by the output of the second sensor and the outputs of the third and fourth function generators, and K. second means for switching the outputs of the third and fourth function generators and the second sensor selectively to the second meter so that in different positions of the second switching means, the second meter indicates
Claim 17
Dependent Claim
42 words
an operator is thereby able to quickly verify that his actual exhaust gas temperature is within the upper and lower limits by manipulating the second switching means between its various positions and observing the direction of movement of the second meter pointer.
Claim 18
Dependent Claim
42 words
an operator is thereby able to quickly verify that his actual exhaust gas temperature is within the upper and lower limits by manipulating the second switching means between its various positions and observing the direction of movement of the second meter pointer.
Claim 19
Dependent Claim
36 words
A tolerance checking system as defined in claim 1 wherein the first sensor is a temperature sensor positioned at a selected location in a jet engine and the second parameter is the speed of the engine.
Claim 20
Dependent Claim
157 words
A tolerance checking system for determining whether the speed of a jet engine at maximum thrust is within limitS imposed by temperature conditions, said system comprising A. a temperature sensor situated at a selected critical temperature zone of the jet engine, said sensor providing a temperature-indicating electrical signal, B. a first function generator for relating said temperature indicating signal to an upper limit engine speed, C. a second function generator for relating said temperature indicating signal to a lower limit engine speed, D. a tachometer including a tachometer generator and a meter which indicates the actual speed of the engine, and E. means for selectively switching the outputs of the function generators and the tachometer generators to the meter so that the operator can verify that his actual speed is within the upper and lower limits for the existant temperature conditions by observing the direction of movement of the meter pointer when the switching means is actuated.
Claim 21
Dependent Claim
157 words
A tolerance checking system for determining whether the speed of a jet engine at maximum thrust is within limitS imposed by temperature conditions, said system comprising A. a temperature sensor situated at a selected critical temperature zone of the jet engine, said sensor providing a temperature-indicating electrical signal, B. a first function generator for relating said temperature indicating signal to an upper limit engine speed, C. a second function generator for relating said temperature indicating signal to a lower limit engine speed, D. a tachometer including a tachometer generator and a meter which indicates the actual speed of the engine, and E. means for selectively switching the outputs of the function generators and the tachometer generators to the meter so that the operator can verify that his actual speed is within the upper and lower limits for the existant temperature conditions by observing the direction of movement of the meter pointer when the switching means is actuated.
Claim 22
Dependent Claim
151 words
Apparatus for checking whether or not a primary parameter is within tolerance limits which are functions of one or more secondary parameters, said apparatus comprising A. means for sensing the values of the secondary parameters, each of said sensing means developing an output corresponding to the value sensed by it, B. means responsive to the outputs of the sensing means for generating corresponding upper and lower limit values of the primary parameter, C. a detector for determining the actual value of the primary parameter, D. an indicator responsive to the outputs of the generating means and the detector, E. means for switching the outputs of the generating means and the detector selectively to the indicator so that an operator can verify that the actual value of the primary parameter is within allowable tolerance limits for the prevailing secondary parameter conditions by observing the changes in indication of the indicator during switching.
Claim 23
Dependent Claim
151 words
Apparatus for checking whether or not a primary parameter is within tolerance limits which are functions of one or more secondary parameters, said apparatus comprising A. means for sensing the values of the secondary parameters, each of said sensing means developing an output corresponding to the value sensed by it, B. means responsive to the outputs of the sensing means for generating corresponding upper and lower limit values of the primary parameter, C. a detector for determining the actual value of the primary parameter, D. an indicator responsive to the outputs of the generating means and the detector, E. means for switching the outputs of the generating means and the detector selectively to the indicator so that an operator can verify that the actual value of the primary parameter is within allowable tolerance limits for the prevailing secondary parameter conditions by observing the changes in indication of the indicator during switching.
Claim 24
Dependent Claim
23 words
Apparatus as defined in claim 6 wherein a secondary parameter is jet engine compressor inlet temperature and the primary parameter is engine speed.
Claim 25
Dependent Claim
38 words
Apparatus as defined in claim 7 wherein said indicator comprises a tachometer meter having a pointer and a scale and the check is performed by observing a direction of movement of the pointer on the scale during switching.
Claim 26
Dependent Claim
34 words
Apparatus as defined in claim 8 and further including frequency generating means in circuit between the generating means and the switching means for converting the output of the generating means to a signal frequency.
Claim 27
Dependent Claim
23 words
Apparatus as defined in claim 6 wherein a secondary parameter is jet engine speed and the primary parameter is engine exhaust gas temperature.
Claim 28
Dependent Claim
195 words
A tolerance checking system for verifying that jet engine speed and exhaust gas temperature prior to takeoff are within allowable tolerance limits considering also the prevailing engine inlet temperature so as to secure maximum engine thrust without overheating the engine combustion chamber, said system comprising A. a first temperature sensor at the engine inlet, said sensor producing an electrical output corresponding to the temperature at that location, B. a first function generator responsive to the output of the first sensor, said generator producing an output signal corresponding to the engine speed upper limit for the temperature condition at the engine inlet, C. a second function generator responsive to the output of the first temperature sensor for producing an output signal corresponding to the engine speed lower limit for the temperature condition at the engine inlet, D. a tachometer generator for developing a signal reflecting actual engine speed, E. a meter controlled by the output of the tachometer generator and the outputs of the function generators, F. means for switching the outputs of the function generators and the tachometer generator selectively to the meter so that in different positions of the switching means, the meter indicates
Claim 29
Dependent Claim
195 words
A tolerance checking system for verifying that jet engine speed and exhaust gas temperature prior to takeoff are within allowable tolerance limits considering also the prevailing engine inlet temperature so as to secure maximum engine thrust without overheating the engine combustion chamber, said system comprising A. a first temperature sensor at the engine inlet, said sensor producing an electrical output corresponding to the temperature at that location, B. a first function generator responsive to the output of the first sensor, said generator producing an output signal corresponding to the engine speed upper limit for the temperature condition at the engine inlet, C. a second function generator responsive to the output of the first temperature sensor for producing an output signal corresponding to the engine speed lower limit for the temperature condition at the engine inlet, D. a tachometer generator for developing a signal reflecting actual engine speed, E. a meter controlled by the output of the tachometer generator and the outputs of the function generators, F. means for switching the outputs of the function generators and the tachometer generator selectively to the meter so that in different positions of the switching means, the meter indicates
References Cited (Backward Citations)
US2995929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |