Back-up surge arresters

Claim 1

A back-up surge arrester suitable for use with a conventional arrester having at least one electrically conductive electrode provided with a dimpled recess therein, comprising, in combination: a) elongated rivet means having; i) two ends, one end thereof adapted to be received into and being in electrically conductive contact with said one electrode of said surge arrester having said dimpled recess; and ii) collar means, disposed remote from said rivet means one end, providing a flat surface circumferentially disposed around said elongated rivet means facing away from said one end; b) first generally flat insulator means having a centrally disposed aperture with a diameter generally equal to the diameter of said rivet means disposed upon said flat surface of said collar means; c) cupped washer means having a flat portion and an extending portion disposed generally perpendicular to said washer flat portion, said extending portion facing away from said one end of said rivet means, said washer means flat portion being provided with an aperture having a diameter greater than said rivet means diameter, said washer means flat portion and said arrester dimpled electrode sandwiching said first insulator therebetween; d) second flat insulator means having a diameter generally equal to the diameter of said cupped washer means flat portion and a centrally disposed aperture with a diameter generally equal to said rivet diameter adapted to be received and cooperate with the flat portion of said cupped washer means; and e) locking washer means having a tapered portion and a flat portion, said flat portion and said cupped washer means flat portion sandwiching said second insulator therebetween, said locking washer means tapered portion having an aperture adapted to be force fit and frictionally held upon said rivet means second end being in electrically conductive contact with said rivet means, said locking washer means forcing and retaining said first and second insulator means and said cupped washer means against said rivet collar means.