Patent US4371911A successfully refreshed from Google Patents.
US4371911A
Expired / Lapsed
US
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Excess voltage arresters
Assignee: DUBILIER INTERNATIONAL PLC DUBILIER HOUSE RADLEY RD ABINGDON OXFORDSHIRE OX14 3XA ENGLAND A BRITISH Co
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Filing: 1981-05-08
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Granted: 1983-02-01
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Expires: 2001-05-08
Abstract
Abstract An excess voltage arrester (1 to 21) provided with an overheating protection device comprising a resilient electrically conductive first member (23) in a flexed condition and a second member (25) of heat softenable electrically insulating material associated with the first member such that on over-heating of the arrester the second member softens allowing the first member to move in an attempt to return to its natural shape, and thereby establish an electrically conductive path through itself between the arrester electrodes.
Inventors
- 👤 Basil O. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:55
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
An excess voltage arrester comprising: a gas-filled enclosure; a pair of electrodes housed within the enclosure which define between them a discharge gap; respective rigid leads to said electrodes; and an overheating protection device comprising a resilient electrically conductive first member in a flexed condition and a second member of heat softenable electrically insulating material associated with said first member so that on overheating of the arrester the second member softens allowing the first member to move in an attempt to return to its natural shape, and thereby establish an electrically conductive path through itself between the arrester electrodes, said first member being in the form of a length of wire whose natural shape is essentially straight and said second member being in the form of a sleeve on the wire, and said wire in its sleeve being held flexed between said rigid leads to the arrester electrodes so that a portion of said sleeve is trapped between said wire and a said lead, and so that on softening of the said sleeve said wire forces its way through said part of the sleeve into electrical contact with said lead.
Claim 2
Dependent Claim
190 words
An excess voltage arrester comprising: a gas-filled enclosure; a pair of electrodes housed within the enclosure which define between them a discharge gap; respective rigid leads to said electrodes; and an overheating protection device comprising a resilient electrically conductive first member in a flexed condition and a second member of heat softenable electrically insulating material associated with said first member so that on overheating of the arrester the second member softens allowing the first member to move in an attempt to return to its natural shape, and thereby establish an electrically conductive path through itself between the arrester electrodes, said first member being in the form of a length of wire whose natural shape is essentially straight and said second member being in the form of a sleeve on the wire, and said wire in its sleeve being held flexed between said rigid leads to the arrester electrodes so that a portion of said sleeve is trapped between said wire and a said lead, and so that on softening of the said sleeve said wire forces its way through said part of the sleeve into electrical contact with said lead.
Claim 3
Dependent Claim
38 words
An arrester according to claim 1 wherein the arrester has at least three electrodes provided with respective rigid leads extending in parallel spaced relation, and said wire in its sleeve is threaded through the gaps between said leads.
Claim 4
Dependent Claim
163 words
An excess voltage arrester comprising: a gas-filled enclosure; a pair of electrodes housed within the enclosure which define between them a discharge gap; respective rigid leads to said electrodes; and an overheating protection device comprising a resilient electrically conductive first member in a flexed condition and a second member of heat softenable electrically insulating material associated with said first member so that on overheating of the arrester the second member softens allowing the first member to move in an attempt to return to its normal shape, and thereby establish an electrically conductive path through itself between the arrester electrodes, said first member comprising a spring in compression and said second member comprising a hollow cylindrical housing for said spring disposed between said rigid leads to the arrester electrodes so that a portion of said housing is trapped between said lead, and on softening of said housing said spring forces its way through said part of the housing into electrical contact with said lead.
Claim 5
Dependent Claim
163 words
An excess voltage arrester comprising: a gas-filled enclosure; a pair of electrodes housed within the enclosure which define between them a discharge gap; respective rigid leads to said electrodes; and an overheating protection device comprising a resilient electrically conductive first member in a flexed condition and a second member of heat softenable electrically insulating material associated with said first member so that on overheating of the arrester the second member softens allowing the first member to move in an attempt to return to its normal shape, and thereby establish an electrically conductive path through itself between the arrester electrodes, said first member comprising a spring in compression and said second member comprising a hollow cylindrical housing for said spring disposed between said rigid leads to the arrester electrodes so that a portion of said housing is trapped between said lead, and on softening of said housing said spring forces its way through said part of the housing into electrical contact with said lead.
Claim 6
Dependent Claim
30 words
An arrester according to claim 3 wherein said rigid leads are in the form of a pair of parallel spaced plates and the arrester enclosure is mounted between the plates.
Claim 7
Dependent Claim
23 words
An arrester according to claim 1 or claim 3 wherein said first member is permanently electrically connected with an electrode of the arrester.
Claim 8
Dependent Claim
31 words
An arrester according to claim 1 or claim 3 wherein, prior to softening of the second member on overheating of the arrester, the first member is insulated from both said electrodes.
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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |