US3720090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch with improved means and method for calibration
Assignee: Texas Instruments Inc
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Filing: 1971-02-09
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Granted: 1973-03-13
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Expires: 1991-02-09
Abstract
Abstract A pressure responsive device including a primary subassembly of a casing member having a cavity sealed by a snap-acting diaphragm member of either mono or bi-metal. An annular calibration-stop member is located adjacent to the diaphragm and is deformed in either of two directions to change the calibration of the diaphragm member. The device is shown operatively connected to an electric switch.
Inventors
- 👤 R Halpert
- 👤 P Fiore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:29
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; H01H35/343
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A method of calibrating a snap-acting diaphragm comprising the steps of forming a chamber in a housing; except for a port to admit pressure in and out of the chamber, sealing the chamber with a snap-acting diaphragm by attaching it about its periphery to the housing; mounting an annular calibration-stop member next to and face to face with the diaphragm; and deforming the calibration-stop member beyond its elastic limit to change the level of pressure at which the diaphragm will snap back to its original position.
Claim 2
Independent Claim
86 words
A method of calibrating a snap-acting diaphragm comprising the steps of forming a chamber in a housing; except for a port to admit pressure in and out of the chamber, sealing the chamber with a snap-acting diaphragm by attaching it about its periphery to the housing; mounting an annular calibration-stop member next to and face to face with the diaphragm; and deforming the calibration-stop member beyond its elastic limit to change the level of pressure at which the diaphragm will snap back to its original position.
Claim 3
Independent Claim
86 words
A method of calibrating a snap-acting diaphragm comprising the steps of forming a chamber in a housing; except for a port to admit pressure in and out of the chamber, sealing the chamber with a snap-acting diaphragm by attaching it about its periphery to the housing; mounting an annular calibration-stop member next to and face to face with the diaphragm; and deforming the calibration-stop member beyond its elastic limit to change the level of pressure at which the diaphragm will snap back to its original position.
Claim 4
Independent Claim
86 words
A method of calibrating a snap-acting diaphragm comprising the steps of forming a chamber in a housing; except for a port to admit pressure in and out of the chamber, sealing the chamber with a snap-acting diaphragm by attaching it about its periphery to the housing; mounting an annular calibration-stop member next to and face to face with the diaphragm; and deforming the calibration-stop member beyond its elastic limit to change the level of pressure at which the diaphragm will snap back to its original position.
Claim 5
Dependent Claim
54 words
A method according to claim 1 including the step of deforming the calibration-stop member by admitting sufficient fluid pressure into the chamber through the port and transmitting the force to the calibration-stop member through the diaphragm member, thereby lowering the level of pressure at which the diaphragm will snap back to its original position.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |