US3585328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch with a plurality of snap acting metal diaphragms coated with metallic oxide
Assignee: Texas Instruments Inc
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Filing: 1970-02-11
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Granted: 1971-06-15
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Expires: 1990-02-11
Abstract
Abstract Plural snap-acting, pressure-responsive, metal diaphragms having dished portions which permit the diaphragms to move from one dished configuration to an inverted dished configuration with snap action are disposed in nested relation to each other in a pressure switch. When fluid pressures are applied to the nested diaphragms from one side thereof, the diaphragms retain their original dished configuration during variation of said fluid pressures over a selected pressure range. However, the diaphragms move together with snap action to their inverted dished configuration when said fluid pressures reach predetermined levels. The diaphragms have protective oxide surface coatings which prevent galling of one diaphragm by another during said snap-acting movement of the nested diaphragms whereby the diaphragms retain their pressure response characteristics over a long service life.
Inventors
- 👤 Peter O Fiore
- 👤 Robert Baboian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:28
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; H01H35/343
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A pressure switch comprising a plurality of snap-acting diaphragms each having a deformed portion which provides said diaphragm with a dished configuration and which permits said diaphragm to move with snap-action to an inverted dished configuration in response to selected force thereon, means supporting said diaphragms in nested relation to each other to expose said diaphragms to fluid pressure force from one side thereof, and a switch mechanism responsive to snap-acting movement of said diaphragms for indicating the occurrence of said movement, said diaphragms each embodying a snap-acting metal diaphragm element having a deformed portion providing said diapHragm with said snap-acting properties, said diaphragms having metal oxide coating means thereon protecting said metal elements from abrasion during said snap-acting movement.
Claim 2
Dependent Claim
120 words
A pressure switch comprising a plurality of snap-acting diaphragms each having a deformed portion which provides said diaphragm with a dished configuration and which permits said diaphragm to move with snap-action to an inverted dished configuration in response to selected force thereon, means supporting said diaphragms in nested relation to each other to expose said diaphragms to fluid pressure force from one side thereof, and a switch mechanism responsive to snap-acting movement of said diaphragms for indicating the occurrence of said movement, said diaphragms each embodying a snap-acting metal diaphragm element having a deformed portion providing said diapHragm with said snap-acting properties, said diaphragms having metal oxide coating means thereon protecting said metal elements from abrasion during said snap-acting movement.
Claim 3
Dependent Claim
20 words
A pressure switch as set forth in claim 1 wherein said snap-acting metal diaphragm elements are formed of stainless steel.
Claim 4
Dependent Claim
34 words
A pressure switch as set forth in claim 2 wherein each of said snap-acting metal diaphragm elements has a protective metal oxide coating thereon of a thickness greater than about 100 Angstrom units thickness.
Claim 5
Dependent Claim
157 words
A pressure switch comprising a pair of casing members defining a pair of switch cavities, a plurality of snap-acting diaphragms each having a deformed portion which provides said diaphragm with a dished configuration and which permits said diaphragm to move with snap-action to an inverted dished configuration in response to selected force thereon, said diaphragms being secured in nested relation to each other to one of said casing members for sealing said cavities from one another and for exposing said diaphragms to force of fluid pressure in one of said cavities, a switch mechanism mounted in the other of said cavities to be responsive to snap-acting movement of said diaphragms for indicating the occurrence of said movement, said diaphragms each embodying a snap-acting metal diaphragm element having a deformed portion providing said diaphragm with said snap-acting properties, said diaphragms each having a metal oxide coating thereon protecting said metal diaphragm elements from abrasion during said snap-acting movement.
Claim 6
Dependent Claim
157 words
A pressure switch comprising a pair of casing members defining a pair of switch cavities, a plurality of snap-acting diaphragms each having a deformed portion which provides said diaphragm with a dished configuration and which permits said diaphragm to move with snap-action to an inverted dished configuration in response to selected force thereon, said diaphragms being secured in nested relation to each other to one of said casing members for sealing said cavities from one another and for exposing said diaphragms to force of fluid pressure in one of said cavities, a switch mechanism mounted in the other of said cavities to be responsive to snap-acting movement of said diaphragms for indicating the occurrence of said movement, said diaphragms each embodying a snap-acting metal diaphragm element having a deformed portion providing said diaphragm with said snap-acting properties, said diaphragms each having a metal oxide coating thereon protecting said metal diaphragm elements from abrasion during said snap-acting movement.
Claim 7
Dependent Claim
20 words
A pressure switch as set forth in claim 4 wherein said snap-acting metal diaphragm elements are formed of stainless steel.
Claim 8
Dependent Claim
34 words
A pressure switch as set forth in claim 2 wherein each of said snap-acting metal diaphragm elements has a protective metal oxide coating thereon of a thickness greater than about 100 Angstrom units thickness.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |