Patent US4185180A successfully refreshed from Google Patents.
US4185180A
Expired / Lapsed
US
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Vibration sensing device
Assignee: Centre for Research in Engineering Surface Technology
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Filing: 1978-06-27
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Granted: 1980-01-22
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Expires: 1998-06-27
Abstract
Abstract The invention provides a vibration sensing device which is used in safety and security equipment. The device is effectively an electrical switch and includes a pair of spaced apart electrically conductive plates each having an annular track formed by a hole. An electrically conductive bar is mounted between the plates on the tracks. On sensing a vibration the bar will resonate lifting off the tracks thus making and breaking the electrical circuit between the plates.
Inventors
- 👤 Francis J. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:11
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/14; H01H35/144
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
106 words
A vibration sensing device comprising: a non-conductive base support member; a pair of spaced apart electrically conductive plates upstanding from the base support member and electrically insulated from each other; an annular track formed in each plate by a hole symmetrical about its central axis; and a single elongated electrically conductive bar, symmetrical in cross-section mounted between the plates on the annular tracks, the cross-sectional area of the bar relative to the area of the hole being such as to permit movement of the bar off the annular tracks on vibration of the device, the said bar and annular tracks forming part of an electrical circuit.
Claim 2
Dependent Claim
106 words
A vibration sensing device comprising: a non-conductive base support member; a pair of spaced apart electrically conductive plates upstanding from the base support member and electrically insulated from each other; an annular track formed in each plate by a hole symmetrical about its central axis; and a single elongated electrically conductive bar, symmetrical in cross-section mounted between the plates on the annular tracks, the cross-sectional area of the bar relative to the area of the hole being such as to permit movement of the bar off the annular tracks on vibration of the device, the said bar and annular tracks forming part of an electrical circuit.
Claim 3
Dependent Claim
35 words
A vibration sensing device as recited in claim 1 in which the diameter of the bar where it contacts the annular track is less than its diameter on at least one side of the plate.
Claim 4
Dependent Claim
27 words
A vibration sensing device as recited in claim 1 in which the bar has two spaced apart recesses of reduced diameter where it engages the annular tracks.
Claim 5
Dependent Claim
47 words
A vibration sensing device as recited in claim 1 in which the vibration sensing device is mounted in a casing which incorporates the base support member, the base support member incorporating a magnetic reed switch, so that the reed switch senses relative movement of an adjacent magnet.
Claim 6
Dependent Claim
33 words
A vibration sensing device as recited in claim 1 in which each annular track is formed by a polygonal hole, adjacent sides of the hole forming spaced apart support surfaces for the bar.
Claim 7
Dependent Claim
47 words
A vibration sensing device as recited in claim 1 in which each annular track has a plurality of circumferentially offset and equispaced inwardly directed supports for the bar, the spacing between two adjacent supports being less than the diameter of the bar where it contacts a track.
Claim 8
Dependent Claim
43 words
A vibration sensing device as recited in claim 6 in which each support forms an arc of a circle and a portion of the track between supports forms an arc of a further circle with its centre coincident with the hole central axis.
Claim 9
Dependent Claim
35 words
A vibration sensing device as recited in claim 6 in which the diameter of the bar where it contacts the annular track is less than its diameter on at least one side of the plate.
Claim 10
Dependent Claim
27 words
A vibration sensing device as recited in claim 6 in which the bar has two spaced apart recesses of reduced diameter where it engages the annular tracks.
Claim 11
Dependent Claim
47 words
A vibration sensing device as recited in claim 6 in which the vibration sensing device is mounted in a casing which incorporates the base support member, the base support member incorporating a magnetic reed switch, so that the reed switch senses relative movement of an adjacent magnet.
Claim 12
Dependent Claim
42 words
A vibration sensing device as recited in claim 1 in which each annular track is formed by a round hole and the bar has formed thereon at least three substantially equi-spaced outwardly directed and circumferentially offset supports to engage the annular track.
Claim 13
Dependent Claim
35 words
A vibration sensing device as recited in claim 1 in which the diameter of the bar where it contacts the annular track is less than its diameter on at least one side of the plate.
Claim 14
Dependent Claim
27 words
A vibration sensing device as recited in claim 1 in which the bar has two spaced apart recesses of reduced diameter where it engages the annular tracks.
Claim 15
Dependent Claim
47 words
A vibration sensing device as recited in claim 11 in which the vibration sensing device is mounted in a casing which incorporates the base support member, the base support member incorporating a magnetic reed switch, so that the reed switch senses relative movement of an adjacent magnet.
Claim 16
Dependent Claim
30 words
A vibration sensing device as recited in claim 1 in which each annular track is formed by a round hole and the bar is a regular sided polygonal in cross-section.
Claim 17
Dependent Claim
27 words
A vibration sensing device as recited in claim 1 in which each annular track is formed from a round hole and the bar is a splined shaft.
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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) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |