US3947758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc thermostat test system and method
Assignee: Texas Instruments Inc
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Filing: 1974-05-14
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Granted: 1976-03-30
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Expires: 1994-05-14
Abstract
Abstract The disclosure relates to a system and method whereby bimetallic discs as well as a completed thermostat can be dynamically tested non-destructively. The bimetallic disc can be tested by utilizing its magnetic properties, the magnetic properties of the disc being sensed by a magnetic transducer under operating conditions to provide a velocity curve of disc movement. The thermostat is tested in the same manner as the disc with simultaneous monitoring of the electrical switch controlled by the disc to insure operation thereof at the ideal point on the disc velocity curve.
Inventors
- 👤 Walter T. Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:09
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; G; G01; G01R; G01R31/00; G01R31/50; H01H2300/00; H01H2300/052; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
A method of testing and adjusting a thermostat having a snap acting disc displaying magnetic properties, a switch and a transfer pin urged by said disc to operate said switch, comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, b. providing a graph on electronic storage means with respect to time of switch operation of said thermostat during snapping of said disc, and c. adjusting the operation of said switch relative to time in response to said graphs in (a) and (b).
Claim 2
Independent Claim
96 words
A method of testing and adjusting a thermostat having a snap acting disc displaying magnetic properties, a switch and a transfer pin urged by said disc to operate said switch, comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, b. providing a graph on electronic storage means with respect to time of switch operation of said thermostat during snapping of said disc, and c. adjusting the operation of said switch relative to time in response to said graphs in (a) and (b).
Claim 3
Dependent Claim
22 words
A method as set forth in claim 1, wherein step (c) comprises adjusting the length of a transfer pin of said thermostat.
Claim 4
Independent Claim
78 words
A system for testing and adjusting a thermostat having a snap action disc having magnetic properties, a transfer pin and a switch operated by movement of said transfer pin in response to movement of said disc, comprising, a. heater means for heating said disc to its snapping temperature, b. a magnetic transducer responsive to movement of said disc to provide an indication of said disc movement and c. storage means for storing the indication of said disc movement.
Claim 5
Independent Claim
78 words
A system for testing and adjusting a thermostat having a snap action disc having magnetic properties, a transfer pin and a switch operated by movement of said transfer pin in response to movement of said disc, comprising, a. heater means for heating said disc to its snapping temperature, b. a magnetic transducer responsive to movement of said disc to provide an indication of said disc movement and c. storage means for storing the indication of said disc movement.
Claim 6
Dependent Claim
40 words
A system as set forth in claim 3 further including a second storage means and a source of voltage coupled between said second storage means and said switch whereby operation of said switch is stored in said second storage means.
Claim 7
Dependent Claim
23 words
A system as set forth in claim 3 wherein said heater means is positioned proximate and in heat coupling relation to said disc.
Claim 8
Dependent Claim
23 words
A system as set forth in claim 4 wherein said heater means is positioned proximate and in heat coupling relation to said disc.
Claim 9
Dependent Claim
26 words
A system as set forth in claim 5 wherein said heater means includes an aperture therein adjacent said disc, said magnetic transducer extending through said aperture.
Claim 10
Dependent Claim
26 words
A system as set forth in claim 6 wherein said heater means includes an aperture therein adjacent said disc, said magnetic transducer extending through said aperture.
Claim 11
Dependent Claim
27 words
A system as set forth in claim 7 wherein said magnetic transducer includes a magnet and a coil surrounding said magnet, said magnet extending through said aperture.
Claim 12
Dependent Claim
27 words
A system as set forth in claim 8 wherein said magnetic transducer includes a magnet and a coil surrounding said magnet, said magnet extending through said aperture.
Claim 13
Independent Claim
54 words
A method of testing a switch having a snap acting disc displaying magnetic properties comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, and b. comparing the velocity graph against a known standard to determine operational characteristics of the switch.
Claim 14
Independent Claim
54 words
A method of testing a switch having a snap acting disc displaying magnetic properties comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, and b. comparing the velocity graph against a known standard to determine operational characteristics of the switch.
Claim 15
Independent Claim
51 words
A method of testing a snap acting disc displaying magnetic properties, comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, and b. comparing the velocity graph against a known standard to determine operational characteristics of the disc.
Claim 16
Independent Claim
51 words
A method of testing a snap acting disc displaying magnetic properties, comprising the steps of a. providing a velocity graph on electronic storage means with respect to time for said disc during snapping thereof, and b. comparing the velocity graph against a known standard to determine operational characteristics of the disc.
Claim 17
Dependent Claim
41 words
A method according to claim 12 in which the velocity graph includes a portion after the disc has snapped and a change in disc geometry can be determined by comparing the said portion of the velocity graph with the known standard.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |