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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7642480 | Actuating the contacts of an interrupting chamber in opposite directions via an insulating tube In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber (10) contains two contacts (12, 14) mounted to move in opposite directions, and actuated via a single device (20). The two conta... | 01/05/2010 |
| 7339132 | Method of current interruption using puffer type gas circuit breaker with combined-action of cylinder and piston A puffer type gas circuit breaker has a piston, which is connected with a center shaft via a link mechanism. At an initial stage of an interruption operation, the link mechanism drives a puffer cylinder and the piston both in an interruption direction while maintain... | 03/04/2008 |
| 7250583 | Gas-insulated switchgear device A gas-insulated switchgear device comprising a first casing housing: at least a first terminal for input/output connection; a disconnector unit comprising at least a first fixed contact operatively coupled to said first terminal and a corresponding first movable con... | 07/31/2007 |
| 7138597 | Circuit breaker with arc gas propelled movable contact and opposed arc cutoff shutters The support for the moving contact of a circuit breaker has a piston that is driven by arc gases generated by initial separation of the contacts through magnetic repulsion to rapidly open the contacts. A pair of telescoping shield sleeves that have aligned openings ... | 11/21/2006 |
| 7091439 | Isolator/circuit-breaker device for electric substations An electric device, in particular for medium or high voltage electric substations, able to perform the functions of circuit-breaking, isolating and earthing is described. The device comprises: a casing; at least one circuit-breaker; at least one line isolator having... | 08/15/2006 |
| 7091431 | Disconnect switch A switch has a first electrical terminal, a second electrical terminal spaced from the first electrical terminal and an elongate conductive switch blade for bridging the terminals. The switch blade has a first end portion pivotally connected with the first electrica... | 08/15/2006 |
| 7078642 | Arc extinguishing device with a high speed whip Rapid arc extinguishing devices for air break switches have a whip with at least an end portion of nonmetallic material such as fiber reinforced plastic with a conductive path on its surface. The nonmetallic material is a single tapered rod or an assembly of a plura... | 07/18/2006 |
| 7053326 | Integrated type gas-insulated switching apparatus In an integrated type gas-insulated switching apparatus, a plurality of switching devices are provided. Each of switching devices includes a contact and an insulated container in which the contact is contained. The contact comprises electrodes adapted to be contacte... | 05/30/2006 |
| 6965088 | Interrupting apparatus having operations counter and methods of forming and using same A portable circuit interrupting apparatus for use on a circuit isolating device and associated methods of formation and use are provided. The portable circuit interrupting apparatus includes a main housing body and a sleeve coaxially mounted therein. The sleeve is s... | 11/15/2005 |
| 6946607 | Resistance assembly for hookstick operated switching assembly A resistance assembly having a resistance member prevents accidental movement of a hookstick operated switching assembly. A switch assembly of the hookstick operated switching assembly is mounted on a base. The resistance member includes a lever connected to the swi... | 09/20/2005 |
| 6943307 | Switching device The switching device for switching high electrical currents and voltages has at least one switch pole (1, 1′, 1″) which is operated by means of a rotatable shaft (8, 8′, 8″). Furthermore, the switching device has at least one lever system (1... | 09/13/2005 |
| 6784392 | Gas-insulated switchgear device A gas-insulated switchgear device which has a first bushing which accommodates a first terminal, a second bushing which accommodates a second terminal, a first enclosure which contains an interruption unit, and at least one first disconnection unit which has a first... | 08/31/2004 |
| 6762385 | Arc extinguishing device with a high speed whip Rapid arc extinguishing devices for air break switches have a whip with at least an end portion of nonmetallic material such as fiber reinforced plastic with a conductive path on its surface. The nonmetallic material is a single tapered rod or an assembly of a plura... | 07/13/2004 |
| 6753492 | Arc extinguishing device with a metal matrix composite high speed whip Rapid arc extinguishing devices for air break switches have a whip with at least an end portion of a metal matrix composite (MMC) material. The MMC whip is applied in embodiments similar to those of prior disclosed fiber reinforced plastic (FRP) whips without need f... | 06/22/2004 |
| 6743999 | Integrated type gas-insulated switching apparatus In an integrated type gas-insulated switching apparatus, a plurality of switching devices are provided. Each of switching devices includes a contact and an insulated container in which the contact is contained. The contact comprises electrodes adapted to be contacte... | 06/01/2004 |
| 6573469 | Gas-insulated switchgear device A gas-insulated switchgear device. A casing is provided with a first connection terminal and a second connection terminal, an interruption unit, and a disconnection unit. The disconnection unit includes a first fixed contact connected to the second connec... | 06/03/2003 |
| 6392181 | ARC extinguishing device with a high speed whip Rapid arc extinguishing devices for air switches are provided with a whip element of strong nonmetallic material, such as of a fiber reinforced plastic or polymer material, with a conductive path, e.g., by metalizing. The whip element can replace the form... | 05/21/2002 |
| 6064025 | Control means for electrical equipment, E.G. for a high-voltage circuit-breaker A controller for electrical equipment, in particular for a high-voltage circuit-breaker, the equipment being housed in a casing filled with a dielectric gas under pressure. An interrupting chamber within the casing extinguishes arcs produced by the main c... | 05/16/2000 |
| 6013888 | Generator circuit breaker having a single mechanical control mechanism A circuit breaker comprising a first permanent current contact and a first arcing contact that are fixed, a second permanent current contact and a second arcing contact that are movable in a longitudinal direction to be connected with or separated from th... | 01/11/2000 |
| 5969314 | Electrical switching apparatus having arc runner integral with stationary arcing contact An integral stationary arcing contact and arc runner for electrical switching apparatus is formed by an electrically conductive member secured to the line conductor adjacent the stationary main contact thereby providing a joint free path for the arc to pa... | 10/19/1999 |
| 5898151 | Circuit-breaker with a disconnector A circuit-breaker including main contacts and arcing contacts includes a shaft carrying a first lever connected to the moving main contact. A hub is mounted inside the shaft and carries a second lever connected to the moving arcing contact; the shaft and ... | 04/27/1999 |
| 5889248 | Operating mechanism for combined interrupter disconnect switch An apparatus for operating a combined interrupter disconnect switch is disclosed. The disconnect switch is operated by a slow speed linear motion of a mechanism pullrod. The interrupter, which is a component of the disconnect switch arm, is operated by a ... | 03/30/1999 |
| 5493090 | Two-step operating mechanism for combined interrupter disconnect switch An operating mechanism for a combined interrupter and disconnect switch comprises an operating crank and an interrupter support housing which are separately rotatable about a common pivotal axis. The interrupter switch is part of a disconnect switch arm a... | 02/20/1996 |
| 5483030 | Group operated circuit disconnect apparatus for overhead electric power lines A group operated switching apparatus for overhead electric power lines has a box-like elongated housing which mounts on a pole and supports three disconnect switches. Three operating shafts are journalled on the housing and are operatively connected to th... | 01/09/1996 |
| 5369234 | Perpendicularly-opening grounding section switch A perpendicularly-opening grounding section switch comprising a female contact and a male contact disposed at the end of the drive rod includes two parallel metal horns disposed in such a manner as to clamp against the end of the arm in the vicinity of th... | 11/29/1994 |
| 5359161 | Non-linear spring for circuit interrupters The invention provides a spring exerting a non-linear force between a contact carrier and a contact blade in a circuit interrupter. The inventive spring includes at least one elongated cantilever. The length of the cantilever has the shape of an arch made... | 10/25/1994 |
| 5243159 | Section or disconnect switch with an interrupter switch operated by the upward movement of the disconnect switch blade A section switch of the type has a blade connected at a first end to a first connector. The blade is enabled during an opening stage, firstly to rotate about its own axis and secondly to pivot about a transverse axis. The blade includes at a second end, a... | 09/07/1993 |
| 5237137 | Isolating switch for metal-clad, compressed-gas insulated high-voltage switchgear In an isolating switch for metal-clad, compressed-gas insulated high-voltage switchgear, a mechanical control unit containing a rotatably supported lever arrangement. The lever arrangement locks automatically in a neutral position and retains an auxiliary... | 08/17/1993 |
| 4661662 | Power line working apparatus A new and improved apparatus is provided to permit a live or hot electrical power line to be cut in the field for line service or other purposes. The apparatus is connected at each end to the line at positions spanning the site of the cut. The attached en... | 04/28/1987 |
| 4652708 | Tank-type switchgear A tank-type switchgear comprises a main contact disposed in a hollow tank and having movable and stationary contact elements, an auxiliary contact disposed in the tank and electrically connected parallel with the main contact and having movable and statio... | 03/24/1987 |
| 4539449 | Disconnect switch A disconnect switch has a fixed tubular contact and a tubular contact movable into connection with the fixed contact. A movable auxiliary contact within the movable tubular contact can travel into connection with a stationary auxiliary contact on the fixe... | 09/03/1985 |
| 4513187 | High-voltage circuit breaker including cut-on resistor A series connection of an auxiliary switching position and a cut-on resistor is connected parallel to at least one primary switching position. A common drive rod is provided with which there is coupled a transmission system operatively associated with the... | 04/23/1985 |
| 4460813 | Load break switch drive mechanism An improved drive mechanism for a "swivel type" load break switch has actuating means arranged generally within the plane of switch support frame in a space between the actuating shaft and an insulating post supporting cross member. The actuating shaft ex... | 07/17/1984 |
| 4421959 | Bridging contactor with main and arcing contacts A bridging contact structure, suitable for use in AC contactors and the like, is provided with double-break stationary main contacts, and with double-break stationary arcing contacts in parallel with the main contacts. Silver usage in the main contacts is... | 12/20/1983 |
| 4414449 | Quick open and close disconnect switch A quick open and close disconnect switch suitable for use in EHV and UHV systems is disclosed. In addition to a conventional main moving contact and a conventional mechanism for operating it, a preferably much smaller, lighter auxiliary moving contact is ... | 11/08/1983 |
| 4315120 | Load disconnection switch A load disconnection switch incorporating a quench chamber is described which features a tube-like housing, a telescope-like arrangement of a quench tube and a switch rod guided for relative axial movement within the tube-like housing and releasably conne... | 02/09/1982 |
| 4283610 | Operator for a circuit interrupter and disconnect switch combination A manual operator for a series-connected circuit interrupter and disconnect combination mounted within a switch gearing closure, which includes an external operating handle affixed to a common operating shaft for the interrupter and the disconnect, which ... | 08/11/1981 |
| 4126773 | Polyphase disconnecting switch arrangement Disclosed is a family of polyphase outdoor interrupter switch arrangements suitable for service in power systems rated up to 34.5 kv with but a single interrupting switch unit per phase. Two insulators are mounted on a base member with one insulator suppo... | 11/21/1978 |
| 4110579 | Improved energy-storage operating mechanisms for circuit-interrupting structures utilizing serially-related disconnecting switch structures therewith An improved operating mechanism of the energy-storage type is provided for circuit-interrupting structures, including an energy-storing means having the energy content therein increased by the movement of a movable member during the closing operation, and... | 08/29/1978 |
| 4105878 | Vacuum interrupter and disconnect combination A compact combination vacuum interrupter and visible break disconnect switch, in which the interrupter is electrically connected in series with the disconnect. The interrupter is manually closed, and can be tripped manually or automatically on overcurrent... | 08/08/1978 |
