US3761958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch
Assignee: Denki Onkyo Co Ltd
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Filing: 1973-02-15
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Granted: 1973-09-25
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Expires: 1993-02-15
Abstract
Abstract A pressure switch comprising a housing having an internal cavity which is divided into a high pressure chamber and a low pressure chamber by a flexible diaphragm, a moving yoke which forms part of a magnetic path and moves in accordance with a motion of the said diaphragm, a galvano-magnetro effect device which is provided in said magnetic path and is exposed to a magnetic flux which varies in accordance with movement of the said moving yoke, wherein a switching circuit operates with the function of the said galvano-magnetro effect device.
Inventors
- 👤 S Nishira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:43
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58; H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2607; H01H35/2614; H01H35/2621
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
229 words
A pressure switch comprising: a. a housing made of a non-magnetic material having an internal cavity, b. a flexible diaphragm which divides said cavity into a high pressure chamber and low pressure chamber and causes the capacities of said both chambers to vary relatively, c. a high pressure side port which is provided in said housing so as to lead to said high pressure chamber, d. a low pressure side port which is provided in said housing so as to lead to said low pressure chamber, e. a moving member made of a non-magnetic material which is provided on one of high pressure and low pressure chamber side surfaces of said flexible diaphragm so that said moving member moves in accordance with displacement of said flexible diaphragm, f. guides provided on said housing to guide the said moving member, g. a magnetic path comprised of a magnetic moving yoke which is fixed on said moving member, h. at least one galvano-magnetro effect device provided in said magnetic path, and i. a switching circuit which is provided with a switching device and is connected to said galvano-magnetro effect device and performs the switching operation in accordance with actuation of said galvano-magnetro effect device, wherein the intensity of magnetic flux to be applied to said galvono-magnetro effect device through said magnetic path varies in accordance with movement of said moving yoke.
Claim 2
Dependent Claim
229 words
A pressure switch comprising: a. a housing made of a non-magnetic material having an internal cavity, b. a flexible diaphragm which divides said cavity into a high pressure chamber and low pressure chamber and causes the capacities of said both chambers to vary relatively, c. a high pressure side port which is provided in said housing so as to lead to said high pressure chamber, d. a low pressure side port which is provided in said housing so as to lead to said low pressure chamber, e. a moving member made of a non-magnetic material which is provided on one of high pressure and low pressure chamber side surfaces of said flexible diaphragm so that said moving member moves in accordance with displacement of said flexible diaphragm, f. guides provided on said housing to guide the said moving member, g. a magnetic path comprised of a magnetic moving yoke which is fixed on said moving member, h. at least one galvano-magnetro effect device provided in said magnetic path, and i. a switching circuit which is provided with a switching device and is connected to said galvano-magnetro effect device and performs the switching operation in accordance with actuation of said galvano-magnetro effect device, wherein the intensity of magnetic flux to be applied to said galvono-magnetro effect device through said magnetic path varies in accordance with movement of said moving yoke.
Claim 3
Dependent Claim
28 words
A pressure switch according to claim 1, wherein a printed circuit board is provided inside said housing and said printed circuit board is formed with said switching circuit.
Claim 4
Dependent Claim
56 words
A pressure switch according to claim 1, wherein said magnetic path is comprised of said moving yoke and a magnetic fixing yoke fixed inside said housing, the fixed yoke opposes to both end faces in parallel with the moving direction of the moving yoke, and one of the fixed yoke and moving yoke contains a magnet.
Claim 5
Dependent Claim
26 words
A pressure switch according to claim 3, wherein said galvano-magnetro effect device is fixed at a position opposing to said moving yoke on the fixed yoke.
Claim 6
Dependent Claim
27 words
A pressure switch according to claim 3, wherein said moving yoke is made of a magnet, both poles of which are respectively opposed to said fixed yoke.
Claim 7
Dependent Claim
14 words
A pressure switch according to claim 3, wherein said fixed yoke contains a magnet.
Claim 8
Dependent Claim
68 words
A pressure switch according to claim 1, wherein a resetting means is provided which depresses said flexible diaphragm so that said flexible diaphragm deflects towards said high pressure chamber when there is no difference of pressure between the high pressure chamber and the low pressure chamber and which has a resetting force against displacement of said flexible diaphragm causing the capacity of said high pressure chamber to increase.
Claim 9
Dependent Claim
22 words
A pressure switch according to claim 7, wherein said moving member and said resetting means are provided in the low pressure chamber.
Claim 10
Dependent Claim
29 words
A pressure switch according to claim 8, wherein said resetting means makes said moving member contact at all times said low pressure chamber side surface of said flexible diaphragm.
Claim 11
Dependent Claim
27 words
A pressure switch according to claim 7, wherein said moving member is provided in the high pressure chamber and said resetting means in the low pressure chamber.
Claim 12
Dependent Claim
17 words
A pressure switch according to claim 7, wherein a coil spring is employed as said resetting means.
Claim 13
Dependent Claim
21 words
A pressure switch according to claim 1, wherein a pair of magnetro-resistance effect device are employed as said galvano-magnetro effect device.
Claim 14
Dependent Claim
87 words
A pressure switch according to claim 12, wherein one of said both magnetro-resistance effect devices receives the magnetic flux when there is not a great pressure difference of pressures in said high and low pressure chambers and does not receive the magnetic flux when there is a great pressure difference, and the other magnetro-resistance effect device receives the magnetic flux when there is a great difference of pressures in said both chambers and does not receive the magnetic flux when there is not a great pressure difference.
Claim 15
Dependent Claim
58 words
A pressure switch according to claim 13, wherein a transistor is employed as said switching device, said both magnetro-resistance effect devices are connected in series, the specified voltage is applied across both ends of said devices in series connection, and the voltage across both ends of one device is applied as the base bias voltage of said transistor.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |