US4605832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential bellows pressure switch
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1984-06-04
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Granted: 1986-08-12
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Expires: 2004-06-04
Abstract
Abstract A differential pressure switch with a housing having two faces opposite each other which comprises two approximately coaxial bellows arranged in the housing, so that each bellows has one of its sides securely fastened to a face of the housing, with a dividing sheet arranged between the bellows such that two separated work chambers are formed. Each work chamber is defined by one face of the housing, by a bellows and by the dividing sheet. The dividing sheet has a section projecting sideways through the bellows for switch control.
Inventors
- 👤 Gerd Koopmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:41
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
Differential pressure switch containing switch means and a housing having two faces opposite each other, comprising: (a) two approximately coaxial bellows arranged in the housing, with each bellows having one of its sides securely fastened to a face of the housing; (b) a dividing sheet arranged between the bellows such that two separated work chambers are formed, each work chamber being defined by one face of the housing, by a bellows and by the dividing sheet, the dividing sheet having a section projecting sideways beyond the bellows for switch control of said switch means, wherein the two work chambers are each equipped, in the area of its housing face, with a fitting for connection to a receiver chamber containing a working fluid, with the fittings being arranged on both sides of the dividing sheet to prevent a strain of the bellows, and projecting so far into the work chambers that the fittings concurrently form support elements for the dividing sheet.
Claim 2
Dependent Claim
160 words
Differential pressure switch containing switch means and a housing having two faces opposite each other, comprising: (a) two approximately coaxial bellows arranged in the housing, with each bellows having one of its sides securely fastened to a face of the housing; (b) a dividing sheet arranged between the bellows such that two separated work chambers are formed, each work chamber being defined by one face of the housing, by a bellows and by the dividing sheet, the dividing sheet having a section projecting sideways beyond the bellows for switch control of said switch means, wherein the two work chambers are each equipped, in the area of its housing face, with a fitting for connection to a receiver chamber containing a working fluid, with the fittings being arranged on both sides of the dividing sheet to prevent a strain of the bellows, and projecting so far into the work chambers that the fittings concurrently form support elements for the dividing sheet.
Claim 3
Dependent Claim
24 words
Differential pressure switch according to claim 1, wherein the portions of the fittings that are in the work chambers are equipped with lateral borings.
Claim 4
Dependent Claim
25 words
Differential pressure switch according to claim 1, wherein the two bellows and remaining parts of the housing form an outer chamber which is vacuum sealed.
Claim 5
Dependent Claim
16 words
Differential pressure switch according to claim 3, wherein the outer chamber is equipped with a valve.
Claim 6
Dependent Claim
42 words
Differential pressure switch according to claim 1, wherein the housing is provided with said switch means in the form of two switches lying across from each other in the area where the dividing sheet contains the section which projects beyond the bellows.
Claim 7
Dependent Claim
29 words
Differential pressure switch according to claim 1, wherein at least the dividing sheet, the bellows, and the housing faces that form the two chambers consist of high quality steel.
Claim 8
Dependent Claim
15 words
Differential pressure switch according to claim 1, wherein the bellows are formed as membrane bellows.
Claim 9
Dependent Claim
45 words
Differential pressure switch according to claim 1, wherein each fitting extends beyond its work chamber and housing face and contains an opening in its extended portion to provide for communication of the working fluid between the work chamber of the bellows and the receiver chamber.
References Cited (Backward Citations)
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Cited
US2672889A
Cited
US3094839A
Cited
US3361037A
Cited
US3501959A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |