H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/230
H01H 25/00 (2006.01) H01H 33/56 (2006.01) H01H 33/82 (2006.01) H01H 33/90 (2006.01)
Patent
CA 1040689
ABSTRACT OF THE DISCLOSURE An improved motion-multiplying linkage-mechanism is provided for the movable contact structure of a circuit- interrupter, particularly one of the sealed-casing type, en- closing a suitable arc-extinguishing medium, such as a highly efficient arc-extinguishing gas, such as compressed sulfur- hexafluoride (SF6) gas, for example. However, where desired, the motion-multiplying mechanism of the present invention may, additionally, be utilized in vacuum interrupters, or in other types of arc-extinguishing devices where the surrounding casing structure is of a sealed type. In accordance with the present invention, a sylphon bellows is secured to an end metallic plate of the sealed casing, and also affixed to the contact operating rod extend- ing therewithin. A motion-multiplying mechanism, such as a lazy-tong, or pantograph-linkage assembly, is attached to the interior end of the contact operating rod, so that for a short initiating driving travel of the contact operating rod from a suitable mechanism, provided externally of the sealed- casing structure, a considerably increased length of travel for the movable contact structure is obtained. Suitable guideways are preferably provided for guiding the linear travel of the lazy-tong linkage structure so as to effect an accurate linear driving motion of the linkage.
223712
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