Patent ID: 7154057
Filing Date: 2006-12-26
Classification: H01H

Abstract:
1. A telescopic switch for use in isolated phase bus duct comprising: first and second spaced apart and axially aligned fixed conductors, the first and second fixed conductors having adjacent end portions each supporting a plurality of individual contact fingers circumferentially positioned thereabout; a telescopic conductor coaxially disposed with the first fixed conductor and being axially moveable between an open position where the telescopic conductor is spaced apart from the second fixed conductor and a closed position where the telescopic conductor bridges the first and second fixed conductors, and the telescopic conductor having first outside contact wall surface portions of a first predetermined radius; and, each of the individual contact fingers comprising first and second finger contact surface portions, the second contact finger surface portion being held in engagement with a corresponding one of the adjacent end portions of the first and second fixed conductors, and the first finger contact surface portion comprising a first contact surface tip portion extending beyond the corresponding one of the adjacent end portions of the first and second conductors, the first contact surface tip portion being of first concave arc shaped width of first radius slightly greater than the first predetermined radius, the first contact surface tip portion overlying in wiping electrical contact one of the first outside contact wall surface portions of the telescopic conductor when in the closed position.