US3816685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive device having improved means for calibration
Assignee: Texas Instruments Inc
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Filing: 1972-12-26
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Granted: 1974-06-11
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Expires: 1992-12-26
Abstract
Abstract A pressure responsive device comprises a first chamber having a port sealed from a second chamber by a pressure responsive snap acting diaphragm. At pressures above an actuation pressure the diaphragm snaps from a first configuration to a second opposite configuration causing a motion transfer pin to move and actuate an electrical switch. The diaphragm snaps back to the first configuration when pressure decreases to a deactuation pressure, different than the actuation pressure, thereby permitting deactuation of the switch. A special diaphragm support is provided to enable calibration of both the actuation and the deactuation pressure independently of one another.
Inventors
- 👤 P Fiore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:56
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; H01H35/343; H01H35/26; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A condition responsive device comprising a circular snapacting diaphragm having a dished surface movable to and from first and second overcenter configurations; calibration means including a member having first and second portions, and means separating the first and second portions so that the second portion can be deformed without affecting the first portion, the member positioned adjacent a surface of the diaphragm; and actuation means positioned adjacent the diaphragm and responsive thereto, the actuation means in contact with the diaphragm when the diaphragm is in the first configuration and out of contact with the diaphragm when the diaphragm is in the second configuration.
Claim 2
Dependent Claim
103 words
A condition responsive device comprising a circular snapacting diaphragm having a dished surface movable to and from first and second overcenter configurations; calibration means including a member having first and second portions, and means separating the first and second portions so that the second portion can be deformed without affecting the first portion, the member positioned adjacent a surface of the diaphragm; and actuation means positioned adjacent the diaphragm and responsive thereto, the actuation means in contact with the diaphragm when the diaphragm is in the first configuration and out of contact with the diaphragm when the diaphragm is in the second configuration.
Claim 3
Dependent Claim
52 words
A device according to claim 1 in which the first portion of the member is a relatively stiff annular flange, the second portion of the member is a relatively thin flange, and the means separating the two portions from each other includes an isolation groove defined in the member between the portions.
Claim 4
Dependent Claim
97 words
A condition responsive assembly comprising a generally circular diaphragm deformed into a dished shape to render it snap acting from a first configuration to a second opposite configuration upon the occurrence of the condition, a calibration-stop member comprising a first relatively rigid annular flange portion, the periphery of the diaphragm and the flange being generally coincident and attached to one another, the member having a second relatively flexible portion extending radially inwardly from the flange portion, and means separating the first and second portions so that the second portion can be deformed without affecting the first portion.
Claim 5
Dependent Claim
97 words
A condition responsive assembly comprising a generally circular diaphragm deformed into a dished shape to render it snap acting from a first configuration to a second opposite configuration upon the occurrence of the condition, a calibration-stop member comprising a first relatively rigid annular flange portion, the periphery of the diaphragm and the flange being generally coincident and attached to one another, the member having a second relatively flexible portion extending radially inwardly from the flange portion, and means separating the first and second portions so that the second portion can be deformed without affecting the first portion.
Claim 6
Dependent Claim
20 words
An assembly according to claim 3 in which the means separating the first and second portions is a circular groove.
Claim 7
Dependent Claim
79 words
An assembly according to claim 4 further including a first chamber formed on the side of the diaphragm remote from the calibration stop-member, a port formed in the first chamber to permit ingress and egress of a fluid medium, and means mounted adjacent the diaphragm on the side of the diaphragm opposite the first chamber responsive to the snapping of the diaphragm from one configuration to the other upon the occurrence of a predetermined pressure in the first chamber.
Claim 8
Dependent Claim
133 words
An assembly according to claim 5 in which the means responsive to the snapping of the diaphragm from one configuration to the other includes an electric switch comprising a base member having an open end, a stationary contact and a movable contact arm disposed in the base, the movable arm adapted to move into and out of engagement with the stationary contact, a hub having a bore extending therethrough closing the open end of the base, an aperture provided in the calibration-stop member and a motion transfer pin slidably received in the bore of the hub extending from the movable contact arm through the aperture in the calibration-stop member to a point adjacent the diaphragm so that in one configuration of the diaphragm the movable contact arm is separated from the stationary contact.
Claim 9
Dependent Claim
51 words
An assembly according to claim 6 in which two electrical leads extend from the electrical switch, a casing is disposed about the electrical switch and is provided with two apertures through which the leads extend, and electrically insulative potting material fills the space between the casing and the switch and leads.
Claim 10
Dependent Claim
39 words
An assembly according to claim 3 in which the second portion of the calibration-stop member is annular in shape and is thinner than the first flange portion and a land and groove separate the two portions from one another.
Claim 11
Dependent Claim
19 words
An assembly according to claim 8 in which the second portion of the calibration-stop member is conical in shape.
Claim 12
Dependent Claim
49 words
An assembly according to claim 7 including a port fitting positioned in the port of the first chamber, the fitting having a threaded bore, a tubular threaded member adjustably poSitioned in the bore of the fitting and a coil spring extending between the tubular threaded member and the diaphragm.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |