Patent US3764946A successfully refreshed from Google Patents.
US3764946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current-limiting electric switch
Assignee: C E SpA CONSTR ELETTROMECCAN
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Filing: 1972-02-02
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Granted: 1973-10-09
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Expires: 1992-02-02
Abstract
Abstract A current-limiting electric switch is disclosed, of the kind having at least one release per pole, each release comprising two contacts carried by respective supporting members, said contacts being electrically connected to a feed and a load terminal through a current path of which said supporting members form, when the contacts are closed, two parallel branches through which currents of opposite sign flow, so that a current increase beyond a preselected limit produces in said two branches electrodynamic repulsion forces to overcome the bias of resilient supporting members and to cause the supporting members to be set apart for separating the contacts, the improvement consisting in the fact that said parallel branches are a part of a closed loop which is made up by said current path in correspondence with each release. The switch according to this invention permits to construct apparatus having shorter working times than those of the prior art and a more reliable operability.
Inventors
- 👤 A Mostosi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:48
CPC Classifications
H; H01; H01H; H01H77/00; H01H77/02; H01H77/10; H01H77/102; H01H77/104; H01H1/00; H01H1/12; H01H1/14; H01H1/20; H01H2001/2091
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A current-limiting electric switch having at least one release per pole, each release comprising two contacts carried by the respective supporting members, said contacts being electrically connected to a feeding terminal and to a loading terminal through a current path of which, when the contacts are closed, said supporting members form two parallel branches through which currents of opposite signs flow, so that a current increase beyond a predetermined limit produces in said branches electrodynamic repulsion forces such as to overcome the contrary bias of resilient holding means and to cause the supporting members to be set apart for separating the contacts, characterized in that said parallel branches form a portion of a closed loop formed by said current path in correspondance with each release.
Claim 2
Dependent Claim
125 words
A current-limiting electric switch having at least one release per pole, each release comprising two contacts carried by the respective supporting members, said contacts being electrically connected to a feeding terminal and to a loading terminal through a current path of which, when the contacts are closed, said supporting members form two parallel branches through which currents of opposite signs flow, so that a current increase beyond a predetermined limit produces in said branches electrodynamic repulsion forces such as to overcome the contrary bias of resilient holding means and to cause the supporting members to be set apart for separating the contacts, characterized in that said parallel branches form a portion of a closed loop formed by said current path in correspondance with each release.
Claim 3
Dependent Claim
23 words
A switch according to claim 1, equipped with two releases per pole, characterized in that said current path makes up two closed loops.
Claim 4
Dependent Claim
89 words
A switch according to claim 2, characterized in that the two releases comprise first contacts placed at the ends of a common conducting supporting member and respective second contacts placed at the ends of respective movable arms the latter being located and electrically connected to the feed and load terminals so that the two current paths which electrically connect said terminals to said second contacts may form respective open loops which, as the contacts are closed, are closed and connected to one another by said common conducting supporting menber.
Claim 5
Dependent Claim
65 words
A switch according to claim 3, characterized in that said second contacts are carried by rotatable arms and are maintained in the closed position by resilient means which are urged, by the rotation of the arms for effecting the rotation of the arms under the control of the electrodynamic repulsion forces; to switch from a biassing condition to a condition of aid to said rotation.
Claim 6
Dependent Claim
76 words
A switch according to claim 2, characterized in that the two releases comprise respective fixed contacts placed at one end of respective fixed arms arranged and electrically connected to the feed and load terminals so that the two current paths which electrically connect said terminals with said fixed contacts from respective open loops, the two releases further comprising respective movable contacts arranged at the ends of a movable common conducting supporting member for closing said loops.
Claim 7
Dependent Claim
38 words
A switch according to claim 5, characterized in that said common movable conducting supporting member is fastened to a translatable supporting member which is held in the contact-closing position by resilient means of the groove and tongue type.
Claim 8
Dependent Claim
24 words
A switch according to claim 1, equipped with a single release per pole, characterized in that said current path is a single closed loop.
Claim 9
Dependent Claim
67 words
A switch according to claim 7, characterized in that the release comprises a movable contact carried by a rotatable arm which iS maintained in the closed position by resilient means which are urged, by the rotation of the arm for the separation of the contacts under the control of the electrodynamic repulsion forces, to switch from a biassing condition to a condition of aid to said rotation.
Claim 10
Dependent Claim
39 words
A switch according to claim 7, characterized in that the release comprises a movable contact carried by a translatable arm which is maintained in the closed position of the contacts by resilient means of the groove and tongue type.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |