Patent US4025744A successfully refreshed from Google Patents.
US4025744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock and vibration sensitive switch
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1976-03-29
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Granted: 1977-05-24
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Expires: 1996-03-29
Abstract
Abstract A shock and vibration sensitive switch is shown constructed from a toroidally shaped disc having a conductive outer periphery supported by sharp, film-penetrating contacts mounted in an insulated housing. The switch may be used in a security system which is energized by the shock and vibration accompanying an unauthorized entry to trigger an alarm. The insulated housing is wafer-shaped and mounts C-shaped contacts that permit the sensor to be unobtrusively mounted in either direction, which contributes to the security of the system.
Inventors
- 👤 Leroy James Kniskern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:00
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A shock and vibration sensitive switch, comprising: a toroidally shaped disc having an inner periphery and a conductive outer periphery; a housing having side walls and a center post for contacting said inner periphery of said disc, wherein the contact therewith prevents said conductive outer periphery of said disc from contacting said housing side walls; and a pair of contacts mounted in said housing for supporting said conductive outer periphery of said disc to close a circuit therebetween which opens when said switch is subjected to shock and vibration.
Claim 2
Dependent Claim
89 words
A shock and vibration sensitive switch, comprising: a toroidally shaped disc having an inner periphery and a conductive outer periphery; a housing having side walls and a center post for contacting said inner periphery of said disc, wherein the contact therewith prevents said conductive outer periphery of said disc from contacting said housing side walls; and a pair of contacts mounted in said housing for supporting said conductive outer periphery of said disc to close a circuit therebetween which opens when said switch is subjected to shock and vibration.
Claim 3
Dependent Claim
58 words
A shock and vibration sensitive switch as claimed in claim 1, wherein said pair of contacts are sharp pointed and the mass of said disc is sufficient to permit said contact of said conductive outer periphery by said sharp pointed contacts to penetrate any undesirable nonconductive film which may accumulate on said conductive outer periphery of said disc.
Claim 4
Dependent Claim
29 words
A shock and vibration sensitive switch as claimed in claim 1, wherein said pair of contacts are L-shaped and symmetrically arranged with sharp pointed ends that support said disc.
Claim 5
Dependent Claim
46 words
A shock and vibration sensitive switch as claimed in claim 1 wherein said pair of contacts are C-shaped and surround said toroidally shaped disc to contact said conductive outer periphery thereof from more than one direction whereby said switch may be mounted in more than direction.
Claim 6
Dependent Claim
31 words
A shock and vibration sensitive switch as claimed in claim 1, wherein said center post of said housing is tubular for receiving a mounting fastener therethrough for mounting said switch housing.
Claim 7
Dependent Claim
99 words
A shock and vibration sensitive switch, comprising: a flat, disc-shaped mass having a conductive outer periphery; a housing; a pair of C-shaped conductive contacts oppositely mounted in said housing each having two ends confronting one another with one opposing pair of said confronting ends contacting said conductive outer periphery of said mass when said housing is oriented in one direction and another opposing pair of said confronting ends contacting said conductive outer periphery when said housing is oriented in another direction, for closing a circuit between said contacts which opens when said switch is subjected to shock and vibration.
Claim 8
Dependent Claim
99 words
A shock and vibration sensitive switch, comprising: a flat, disc-shaped mass having a conductive outer periphery; a housing; a pair of C-shaped conductive contacts oppositely mounted in said housing each having two ends confronting one another with one opposing pair of said confronting ends contacting said conductive outer periphery of said mass when said housing is oriented in one direction and another opposing pair of said confronting ends contacting said conductive outer periphery when said housing is oriented in another direction, for closing a circuit between said contacts which opens when said switch is subjected to shock and vibration.
Claim 9
Dependent Claim
39 words
A shock and vibration sensitive switch as claimed in claim 6 wherein said disc-shaped mass is toroidally shaped and said housing has a tubular supporting post passing through the center of said toroidally shaped mass for mounting said housing.
Claim 10
Dependent Claim
44 words
A shock and vibration sensitive switch as claimed in claim 6 wherein each of said pair of C-shaped conductive contacts have sharp inner corners on said two ends confronting one another to penetrate any non-conductive film on said conductive outer periphery of said mass.
Claim 11
Dependent Claim
41 words
A shock and vibration sensitive switch as claimed in claim 6; additionally comprising: a cable; said housing having a wire receiving chamber for receipt of said cable; and a housing cover to retain said cable, mass and contacts in said housing.
Claim 12
Dependent Claim
42 words
A shock and vibration sensitive switch as claimed in claim 6; additionally comprising a four-conductor cable passing into said housing and having two conductors joined together in said housing and two further conductors each joined to said pair of C-shaped conductive contacts.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |