Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 6410867 | Bolted conical loading joint system A switching device has an improved fastening arrangement to provide a hermetic and gas-tight, secure joint where the electrical insulating bushing mates with a circuit interrupter tank. The fastening arrangement utilizes a plurality of fasteners that are ... | 06/25/2002 |
| 5942723 | Positive locking mechanism for in-line switch An isolating switch for an electric power line including a sub-assembly made up of two electrically conductive and pieces interconnected by at least one insulator. The end pieces have respective aligned grooves for registry with the electric power line, a... | 08/24/1999 |
| 5874900 | Monitoring system and method for an overhead power line phase switch In an overhead power line switch, critical switch adjustment dimensions, switch position, switch status and other switch parameters are sensed by a plurality of particularly placed sensors, allowing determination as to whether the switch has operated corr... | 02/23/1999 |
| 5584379 | Disconnect switch double motion mechanism A double-sided break switch is provided which is operated by a double motion mechanism that rotates the blade about its own axis.... | 12/17/1996 |
| 5560474 | Electro/mechanical actuator for circuit disconnect/connect apparatus for overhead power lines The apparatus includes contact blades at different elevations on a utility pole rotatable between electrical connection and disconnection positions vis-a-vis contact members. To rotate the contact blades, an electromechanical linear actuator extends a cle... | 10/01/1996 |
| 5534858 | Poletop switch automation system A switch automation system which activates poletop power line switches in response to signals received from a remote location. An actuator piston and cylinder assembly is mounted to a power pole in alignment with existing actuator linkage. The piston and ... | 07/09/1996 |
| 5488212 | Switching device for an on-load tap changer Disclosed is a switching device for a tap changer comprising an input lever and an output lever rotatably attached to a shaft. The output lever is provided for making contact with a selected one of a first tap and a second tap. The output lever has a camm... | 01/30/1996 |
| 5186315 | High voltage disconnecting switch A disconnecting switch for a high voltage electrical substation, including a plurality of articulated arms pivotally connected together to define a movable system, one end of the movable system connected to a stationary support. The switch includes a cont... | 02/16/1993 |
| 5025120 | Insert for a hydro pole switch An insert for a hydro pole switch is disclosed. The insert has a rod member extending the length of a hydro pole and terminating at a handle. The rod member is formed from spaced inline rod portions with adjacent end portions separated by a predetermined ... | 06/18/1991 |
| 4688013 | Switchgear assembly for electrical apparatus A switchgear assembly for an electrical apparatus capable of improving operability thereof to a practical extent, as well as reducing not only installation area or space for various devices to be disposed below the switchgear but also the weight of the sw... | 08/18/1987 |
| 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 |
