Flange fastening means for a contact button for a vacuum-type circuit interrupter

Claim 1

In contact structure for a vacuum-type interrupter, a. a pair of separable contacts, b. one of the contacts being a disc-shaped member having an arcing surface facing the other contact, having an integral central boss, and having an annular groove formed in said arcing surface and surrounding said integral central boss, c. said groove having a base wall and two spaced -apart sidewalls, one defined by the outer periphery of said boss, d. an annular contact-making button mounted in said groove, e. said button comprising a main body portion of annular form and an annular shoulder integral with said body portion and projecting radially inward from said body portion along the base wall of said groove, f. the outer periphery of said boss being deformed to define an integral lip extending radially outward from the remainder of the boss, overlapping said shoulder, and tightly sandwiching said shoulder between said lip and said base wall to prevent relative movement between said button and the walls of said groove, g. said contact-making button having an exposed face on the opposite side thereof from said base wall for engaging the other of said contacts, said button carrying current between said base wall and said exposed face when said exposed face engages said other contact.