US4866426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic amplifier housing and detector for an improved tamper alarm system
Assignee: United States Department of the Navy
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Filing: 1988-06-17
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Granted: 1989-09-12
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Expires: 2008-06-17
Abstract
Abstract A magnetic amplifier housing uses a base, dowel and shunt to magnetizable terial to concentrate the magnetic field of a ring magnet through a Hall Effect transistor to provide an improved detector device with increased gain. The detector device causes polarity reversal when tampered with, ensures positive mechanical alignment of the transistor and mechanical components, and protection of the transistor from mechanical damage.
Inventors
- 👤 Mark M. Evans
- 👤 Roman V. Kruchowy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:55
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/06
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
219 words
A magnetic amplifier housing and detector for tamper alarm systems, comprising: a. a base means comprised of ferromagnetic material; b. a cavity in said base means which houses a Hall Effect device, said Hall Effect device having means for being connected to a remote alarm circuit means; c. a cap means for said cavity, also made from ferromagnetic material, which is mounted over and encloses said Hall Effect device within said base means and which protrudes outwardly from said base means; said base means, Hall Effect device, and cap means forming a base assembly; d. a magnet means which is operable to removably fit over and mesh with said protruding cap means of said base assembly, e. said magnet means and said base assembly when meshed together being operable to latch together opposite components of a closure device; said magnet means and said base assembly when meshed together being operable to concentrate the magnetic field of said magnet means through said Hall Effect device to produce a voltage output signal; separation of said magnetic means from said base assembly operable to cause said voltage output signal to change and to reverse before being fully disengaged, wherein the resultant change in voltage output from the Hall Effect device is operable to be acted on by the remote alarm circuit means.
Claim 2
Dependent Claim
219 words
A magnetic amplifier housing and detector for tamper alarm systems, comprising: a. a base means comprised of ferromagnetic material; b. a cavity in said base means which houses a Hall Effect device, said Hall Effect device having means for being connected to a remote alarm circuit means; c. a cap means for said cavity, also made from ferromagnetic material, which is mounted over and encloses said Hall Effect device within said base means and which protrudes outwardly from said base means; said base means, Hall Effect device, and cap means forming a base assembly; d. a magnet means which is operable to removably fit over and mesh with said protruding cap means of said base assembly, e. said magnet means and said base assembly when meshed together being operable to latch together opposite components of a closure device; said magnet means and said base assembly when meshed together being operable to concentrate the magnetic field of said magnet means through said Hall Effect device to produce a voltage output signal; separation of said magnetic means from said base assembly operable to cause said voltage output signal to change and to reverse before being fully disengaged, wherein the resultant change in voltage output from the Hall Effect device is operable to be acted on by the remote alarm circuit means.
Claim 3
Dependent Claim
29 words
A detector device as in claim 1, wherein said magnet means includes a shunt means for concentrating the magnetic field of the magnet means through the Hall Effect device.
Claim 4
Dependent Claim
15 words
A detector device as in claim 1, wherein said magnet means is a ring magnet.
Claim 5
Dependent Claim
16 words
A detector device as in claim 1, wherein said magnet means comprises a cluster of magnets.
Claim 6
Dependent Claim
26 words
A detector device as in claim 1, wherein a dome-shaped shunt means is included to concentrate the magnetic field through the center of said magnet means.
Claim 7
Dependent Claim
29 words
A detector device as in claim 1, wherein said cap means protrudes through said magnet means and includes means to lockingly secure said magnet means to said base assembly.
Claim 8
Dependent Claim
23 words
A detector device as in claim 1, wherein said magnet means and said base means are insulatively coated against corrosion from the elements.
Claim 9
Dependent Claim
89 words
A detector device as in claim 1, wherein said remote alarm circuit comprises an analog-to-digital converter, a microprocessor, and an alarm means; said analog-to-digital converter being operable to calculate a resultant change in voltage reading from said Hall Effect device between a baseline voltage reading after the detector base assembly is enmeshed with said magnet means and the voltage output when the magnet means is separated from the base assembly, and feed a digital code to said microprocessor whose output is in turn acted upon by the alarm means.
Claim 10
Dependent Claim
191 words
A magnetic amplifier housing and detector for tamper alarm systems, comprising: a. a base means comprised of magnetizable material; b. a Hall Effect device mounted on said base means, said Hall Effect device having means for being connected to a remote alarm circuit means; c. a cap means, also made from magnetizable material, mounted over said Hall Effect device and which protrudes outwardly from said base means and said Hall Effect device; said base means, Hall Effect device, and cap means forming a base assembly; d. a magnet means which is operable to removably fit about and mesh with said protruding cap means mounted above said Hall Effect device, e. said magnet means and said base assembly when meshed together being operable to concentrate the magnetic field of said magnet means through said Hall Effect device to produce a voltage output signal; separation of said magnetic means from said base assembly operable to cause said voltage output signal to change and to reverse before being fully disengaged, wherein the resultant change in voltage output from the Hall Effect device is operable to be acted on by the remote alarm circuit means.
Claim 11
Dependent Claim
191 words
A magnetic amplifier housing and detector for tamper alarm systems, comprising: a. a base means comprised of magnetizable material; b. a Hall Effect device mounted on said base means, said Hall Effect device having means for being connected to a remote alarm circuit means; c. a cap means, also made from magnetizable material, mounted over said Hall Effect device and which protrudes outwardly from said base means and said Hall Effect device; said base means, Hall Effect device, and cap means forming a base assembly; d. a magnet means which is operable to removably fit about and mesh with said protruding cap means mounted above said Hall Effect device, e. said magnet means and said base assembly when meshed together being operable to concentrate the magnetic field of said magnet means through said Hall Effect device to produce a voltage output signal; separation of said magnetic means from said base assembly operable to cause said voltage output signal to change and to reverse before being fully disengaged, wherein the resultant change in voltage output from the Hall Effect device is operable to be acted on by the remote alarm circuit means.
Claim 12
Dependent Claim
25 words
A detector device as in claim 9, wherein said Hall Effect device is mounted within a bushing type housing and closed with said cap means.
Claim 13
Dependent Claim
29 words
A detector device as in claim 9, wherein said magnet means includes a shunt means for concentrating the magnetic field from said magnet means through said Hall Effect device.
Claim 14
Dependent Claim
15 words
A detector device as in claim 9, wherein said magnet means comprises a ring magnet.
Claim 15
Dependent Claim
16 words
A detector device as in claim 9, wherein said magnet means comprises a cluster of magnets.
Claim 16
Dependent Claim
26 words
A detector device as in claim 9, wherein a dome-shaped shunt means is included to concentrate the magnetic field through the center of said magnet means.
Claim 17
Dependent Claim
29 words
A detector device as in claim 9, wherein said cap means protrudes through said magnet means and includes means to lockingly secure said magnet means to said base assembly.
Claim 18
Dependent Claim
89 words
A detector device as in claim 10, wherein said remote alarm circuit comprises an analog-to-digital converter, a microprocessor, and an alarm means; said analog-to-digital converter operable to calculate a resultant change in voltage reading from said Hall Effect device between a baseline voltage reading made after the detector base assembly is enmeshed with said magnet means and the voltage output when the magnet means is separated from the base assembly, and feed a digital code to said microprocessor whose output is in turn acted upon by the alarm means.
Claim 19
Dependent Claim
39 words
A detector device as in claim 10, wherein said magnet means and said base assembly when enmeshed together being operable to latch together opposite components of a closure device to secure the closure device against tampering and unauthorized opening.
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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |