US4430900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive switching device particularly pressostat or thermostat
Assignee: Danfoss AS
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Filing: 1981-12-28
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Granted: 1984-02-14
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Expires: 2001-12-28
Abstract
Abstract A pressure responsive switching device, particularly a pressostat or thermostat, comprises an actuating element (5) which is loaded in one direction by an operating element (1) at the pressure and in the other direction by a main spring (9) by way of a force transmission device (10). The latter has a physical quantity (P k ) which is variable with the force transmitted by the operating element. In addition, there is a measured value generator (23) which, depending on this physical quantity, delivers an electric analogue signal (S). The force transmission device may comprise a compensating force producer (10) in the form of an expansion element (15) which is provided with a liquid-vapor filling and a heating device (21), by which the compensating force of the force of the operating element (1) is made to follow. In this way, the switching device can deliver an analogue signal (S) corresponding to the system pressure (P) by using the same operating element (1).
Inventors
- 👤 Knud V. Valbjorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/004; G01L11/006; G01L9/00; G01L9/0033; H; H01; H01H; H01H35/00; H01H35/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A pressure responsive switching device such as a pressostat or thermostat, comprising, an operating element subject to an operating pressure, contact switch means for operating equipment externally of said switching device, an actuating element for operating said switch means which is loaded in one direction by said (an) operating element (subject to an operating pressure) and in the other direction by a main spring, (a contact) said switching means being operable by said actuating element after a predetermined displacement thereof, a force path between said operating element and said main spring including (a) an auxiliary force transmission device having a physical response quantity variable with a force transmitted thereto by said operating element, and a measured value generator connected to said force transmission device which emits an electric analog signal in response to said physical quantity.
Claim 2
Dependent Claim
136 words
A pressure responsive switching device such as a pressostat or thermostat, comprising, an operating element subject to an operating pressure, contact switch means for operating equipment externally of said switching device, an actuating element for operating said switch means which is loaded in one direction by said (an) operating element (subject to an operating pressure) and in the other direction by a main spring, (a contact) said switching means being operable by said actuating element after a predetermined displacement thereof, a force path between said operating element and said main spring including (a) an auxiliary force transmission device having a physical response quantity variable with a force transmitted thereto by said operating element, and a measured value generator connected to said force transmission device which emits an electric analog signal in response to said physical quantity.
Claim 3
Dependent Claim
40 words
A device according to claim 1, characterized in that said force transmission device is a force storer of which the mechanical condition is affected by a force transmitted by said operating element, said measured value generator being an electromechanical converter.
Claim 4
Dependent Claim
25 words
A device according to claim 2, characterized in that said force transmission device is a leaf spring and said electromechanical converter is a strain gauge.
Claim 5
Dependent Claim
20 words
A device according to claim 3, characterized in that said actuating element is in the form of a leaf spring.
Claim 6
Dependent Claim
53 words
A device according to claim 1, characterized in that said force transmission device includes a compensating force generator with a regulating circuit which causes said compensating force to follow the force of said operating element, and said measured value generator converting a physical quantity of said regulating circuit into an electric analog signal.
Claim 7
Dependent Claim
33 words
A device according to claim 5, characterized in that said compensating force generator is an electromagnet and said measured value generator derives said electric analog signal from an electric qiuantity which controls same.
Claim 8
Dependent Claim
51 words
A device according to claim 5, characterized in that said compensating force generator is an expansion element which is provided with an electric heating device (21;121) and which has a box provided with a diaphragm means and a vapor filling, said measured value generator measuring the temperature of said vapor filling.
Claim 9
Dependent Claim
19 words
A device according to claim 7, characterized in that said heating device comprises a heating coil surrounding said box.
Claim 10
Dependent Claim
48 words
A device according to claim 7, characterized in that said heating device is operated by a switch of which both contacts are coupled to a respective end face of said box, said end faces facing said main spring or said operating element being movable relatively to each other.
Claim 11
Independent Claim
70 words
A device according to one of the claims 7 to 9 in which the path of said actuating element is limited by an abutment at least on one side of the releasing position and in the vicinity thereof, at least one said abutment being cooperable with the part of said expansion element coupled to said main spring, said actuating element being disposed between said operating element and said expansion element.
Claim 12
Dependent Claim
17 words
A device according to claim 7, characterized in that said measured value generator is a temperature-dependent resistor.
Claim 13
Dependent Claim
16 words
A device according to claim 7, characterized in that said measured value generator is a thermo-element.
Claim 14
Dependent Claim
42 words
A device according to claim 7, characterized in that said electric heating device has a temperature-dependent heating resistor which also serves as said measured value generator and that an electric circuit measures said resistance after said heating current has been switched off.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |