Patent US4532390A successfully refreshed from Google Patents.
US4532390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm pressure switch for controlling small pressure gradients
Assignee: SIGNAL LUX SpA A ITALY CORP
•
Filing: 1983-11-14
•
Granted: 1985-07-30
•
Expires: 2003-11-14
Abstract
Abstract A pressure switch for detecting and controlling small pressure gradients in fluid circulation systems includes a containing body having first and second channels formed therein, and an elastically deformable diaphragm. The diaphragm is supported at its edges by the body and separates the first and second channels from each other. A small disc formed of an electrically conductive material cooperatingly engages a portion of one of the faces of the diaphragm. Electrical contacts are supported by the body and disposed adjacent the small disc. The diaphragm is provided with a working portion that is disposed outwardly from the periphery of the small disc and is relatively thin. The pressure switch further includes an annular supporting plug projecting from the containing body and engaging the diaphragm close to the edge of the disc.
Inventors
- 👤 Cesare Gallone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:02
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A diaphragm pressure switch for controlling small pressure gradients comprising, in a containing body communicating with the outside by means of channels: a diaphragm subject to elastic deformation, supported at its edges by said body and separating said channels from each other, at least a small disc made of electrically conductive material cooperatingly engaging a portion of one of the faces of said diaphragm, and electrical contacts supported by said body and disposed adjacent said small disc, characterized in that said diaphragm is provided with a working portion disposed outwardly from the periphery of said small disc and presenting a thin thickness, and in that means for supporting said diaphragm are provided and positioned in proximity to the working portion of the diaphragm and near one of the faces thereof and outwardly from the periphery of the small disc, the diaphragm supporting means being provided for preventing irregular deformations of said working portion.
Claim 2
Dependent Claim
153 words
A diaphragm pressure switch for controlling small pressure gradients comprising, in a containing body communicating with the outside by means of channels: a diaphragm subject to elastic deformation, supported at its edges by said body and separating said channels from each other, at least a small disc made of electrically conductive material cooperatingly engaging a portion of one of the faces of said diaphragm, and electrical contacts supported by said body and disposed adjacent said small disc, characterized in that said diaphragm is provided with a working portion disposed outwardly from the periphery of said small disc and presenting a thin thickness, and in that means for supporting said diaphragm are provided and positioned in proximity to the working portion of the diaphragm and near one of the faces thereof and outwardly from the periphery of the small disc, the diaphragm supporting means being provided for preventing irregular deformations of said working portion.
Claim 3
Dependent Claim
50 words
A diaphragm pressure switch according to claim 1, characterized in that a central portion of said small disc contactingly engages said diaphragm and in that said diaphragm supporting means include an annular supporting lug projecting from said containing body and engaging said diaphragm close to the edge of said disc.
Claim 4
Dependent Claim
36 words
A diaphragm pressure switch according to claim 2, characterized in that the ratio between the diameter of said small disc and the inner diameter of said annular supporting lug is equal to or more than 0.9.
Claim 5
Dependent Claim
32 words
A diaphragm pressure switch according to claim 1, characterized in that said diaphragm has a thickness that gets gradually thinner from its centre towards the edge where an edge swelling is provided.
Claim 6
Dependent Claim
41 words
A diaphragm pressure switch according to claim 4, characterized in that said edge swelling is clamped and closely received between two contiguous portions of the body, the contiguous portions exerting pressure on the edge swelling to form a fluid seal therewith.
Claim 7
Dependent Claim
68 words
A diaphragm pressure switch according to claim 1, characterized in that said diaphragm is provided in the middle with a dome-shaped profile counter-shaped with respect to a central portion of said small disc and in that a compression spring is inserted into said central portion, the spring biasing said small disc in the direction of said diaphragm and being supported by a cup-shaped element engaged with said body.
Claim 8
Dependent Claim
44 words
A diaphragm pressure switch according to claim 6, characterized in that said cup-shaped element includes an outer surface having a screw-threaded portion and a sealing lip, each of the screw-threaded portion and sealing lip engaging said body and disposed within one of the channels.
Claim 9
Dependent Claim
30 words
A diaphragm pressure switch according to claim 1, characterized in that said body is defined by two half-shells engaged with each other by means of a pin and slot connection.
Claim 10
Dependent Claim
52 words
A diaphragm pressure switch according to claim 1, characterized in that a second diaphragm is inserted into said body and is engaged by the body itself so that, together with said working diaphragm, it sealingly isolates the inner area of said body where said small disc and said electrical contacts are housed.
Claim 11
Dependent Claim
54 words
A diaphragm pressure switch according to claim 9, characterized in that said body is divided into three portions and in that said working diaphragm is clamped between a central portion and one end portion of the body itself while said second diaphragm is clamped between said central portion and the second end portion thereof.
Claim 12
Dependent Claim
19 words
A diaphragm pressure switch according to claim 9, characterized in that said second diaphragm has a substantially sinusoidal-shaped section.
Claim 13
Dependent Claim
71 words
A diaphragm pressure switch according to claims 1 or 9, which further includes an additional circular plate and a calibrating spring, the spring biasing the additional circular plate in the direction of the electrical contacts, and a calibrating headless screw having a bore formed centrally therethrough, the headless screw being disposed within one of the channels formed in the body and supporting the calibrating spring within said one of the channels.
Claim 14
Dependent Claim
64 words
A diaphragm pressure switch according to claim 9, which further includes a rigid frame disposed within the inner area and cooperatively linked to the small disc, the frame being dimensioned to be closely received between the small disc and the second diaphragm to bias the working diaphragm and the second diaphragm sufficiently to provide each of the diaphragms with a substantially flattened cross-sectional shape.
References Cited (Backward Citations)
US1840340A
Cited
US2039717A
Cited
US2813945A
Cited
US3005067A
Cited
FR1390306A
Cited
US4104495A
Cited
US4307272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |