US3824512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic self-latching pressure switch
Assignee: United States Atomic Energy Commission
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Filing: 1973-11-14
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Granted: 1974-07-16
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Expires: 1993-11-14
Abstract
Abstract A pressure-operated switch is provided that will maintain closure indefinitely until it is reset electrically. A permanent magnet is positioned close to a reed relay switch in response to a shock wave and the magnet acting in conjunction with two pole pieces effects the closing of the switch which then remains closed even when the shock wave no longer exists. The switch may then be reset to an open position by means of an electrical coil encompassing the reed switch.
Inventors
- 👤 F Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:52
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/247; H01H35/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A magnetic self-latching pressure switch comprising a base member; a non-magnetic bellows mounted on said base and provided with a non-magnetic diaphragm cover over the open end of said bellows; a reed switch mounted on said base member and within said bellows; said reed switch having first and second electrical leads connected to respective contacts thereof; a permanent magnet mounted on the inside of said cover to move toward said base responsive to incidence on said cover of a pressure wave; and first and second L-shaped pole pieces mounted symmetrically on said base with respect to said magnet, each of said pole pieces being connected to a correSponding lead from said reed switch to induce an attractive polarity in said leads and on said switch contacts, thereby effecting a closing of said switch contacts upon movement of said magnet a calibrated distance toward said pole pieces in response to said pressure wave, the distance between said pole pieces and said magnet being such that sufficient magnetic flux exists therebetween to maintain said contacts closed upon return of said magnet to its normal position.
Claim 2
Dependent Claim
183 words
A magnetic self-latching pressure switch comprising a base member; a non-magnetic bellows mounted on said base and provided with a non-magnetic diaphragm cover over the open end of said bellows; a reed switch mounted on said base member and within said bellows; said reed switch having first and second electrical leads connected to respective contacts thereof; a permanent magnet mounted on the inside of said cover to move toward said base responsive to incidence on said cover of a pressure wave; and first and second L-shaped pole pieces mounted symmetrically on said base with respect to said magnet, each of said pole pieces being connected to a correSponding lead from said reed switch to induce an attractive polarity in said leads and on said switch contacts, thereby effecting a closing of said switch contacts upon movement of said magnet a calibrated distance toward said pole pieces in response to said pressure wave, the distance between said pole pieces and said magnet being such that sufficient magnetic flux exists therebetween to maintain said contacts closed upon return of said magnet to its normal position.
Claim 3
Dependent Claim
57 words
The pressure switch set forth in claim 1, and further including an electrical coil encompassing said reed switch, said coil adapted to be selectively connected to a remote external power supply, whereby the contacts of said reed switch when closed may be reset to an open condition by an energization of said coil by said power supply.
Claim 4
Dependent Claim
31 words
The pressure switch set forth in claim 2, and further including a short length of capillary tubing extending through said base to provide for automatic adjustment to changes in atmospheric pressure.
References Cited (Backward Citations)
US2701827A
Cited
US3349203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |