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US 4,504,708 AGranted
Disconnect switch
AssigneeRuhrtal-Elektrizitatsgesellschaft Hartig GmbH & Co.
InventorAlfred Hartig
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AssigneeRuhrtal-Elektrizitatsgesellschaft Hartig GmbH & Co.
InventorAlfred Hartig
Estimating the term…
A switch for making and breaking a connection between a load circuit and a power line, with two parallelogrammatic linkages terminating in scissorlike contactor pairs, has limitedly swivelable and/or extensible cross-links interconnecting aligned pivotal junctions of the two linkages to provide them with a certain relative mobility. In an operating position, part-cylindrical armatures detachably secured to the two contactor pairs grip respective portions of an elongate countercontact fixedly suspended between a pair of rings attached to the power line, this countercontact comprising a metallic supporting tube also provided with part-cylindrical armatures in the region of the contactor pairs. Each armature may comprise several metallic layers on a base of copper, namely an inner layer of silver, a protective layer of tin on top thereof, and an outer silver layer. The armatures could also be made, at least in part, of a scorchproof material such as silver/cesium oxide.
In an electrical switch comprising a pair of parallelogrammatic linkages disposed in two parallel planes, each of said linkages including a pair of scissor arms terminating in contactors operable to grip an elongate countercontact transverse to said planes, the scissor arms of each linkage being articulated to each other and to a pair of coacting arms by respective pivotal junctions, at least one pair of corresponding junctions of said linkages being interconnected by spacing means for simultaneous displacement of the respective scissor arms relative to said countercontact,
Dependencies are inferred from the claim text.