Locking and scraping washer

Claim 1

A FASTENING ASSEMBLY COMPRISING A LOCKING AND WORK SURFACE SCRAPING WASHER MADE OF SHEET METAL FOR USE WITH COOPERATING ROTARY CLAMPING MEMBERS SUCH AS A NUT AND BOLT TO ELECTRICALLY CONNECT PREVIOUSLY COATED FLAT METAL SHEETS SECURED TOGETHER BY THE ROTARY CLAMPING MEMBERS, SAID WASHER BEING PROVIDED WITH A PLURALITY OF UPSTANDING FLANGE PORTIONS SUBSTANTIALLY PARALLEL TO THE AXIS OF THE WASHER, SAID FLANGE PORTIONS BEING JUXTAPOSED ONE ANOTHER AND CONFIGURED TO PROVIDE A POLY GONAL SHAPE FOR THE RECEPTION OF ONE COMPLEMENTARY SHAPED ROTARY CLAMPING MEMBER TO PERMIT ROTATION OF THE WASHER THEREWITH DURING ASSEMBLY WITH SAID SHEETS, BUT PREVENTING ROTATION OF THE MEMBER WHEN IN ASSEMBLED CONDITION WITH SAID SHEETS, A PLURALITY OF SPACED TONGUE PORTIONS ON THE WASHER EACH INTEGRALLY JOINED TO A PAIR OF JUXTAPOSED FLANGE PORTIONS AND EXTENDING RADIALLY INWARDLY SUBSTANTIALLY PERPENDICULAR TO THE PLANES OF THE FLANGE PORTIONS FOR SUPPORTING THE TONGUE PORTIONS ALONG THE DIRECTION IN WHICH THEY EXTEND, SAID TONGUE PORTIONS DEFINING A CENTRAL OPENING AT THE INNER END THEREOF, EACH OF SAID TONGUE PORTIONS BEING PROVIDED WITH A PAIR OF RADIAL EDGES, EACH OF SAID EDGES BEING FORMED ALONG THEIR ENTIRE LENGTH TO AXIALLY EXTEND UNIFORMLY FROM SAID TONGUE PORTION IN A DIRECTION GENERALLY OPPOSITE TO THAT OF THE FLANGE PORTIONS TO PROVIDE SHARP SCRAPER TEETH IN A COMMON PLANE FOR IMPINGING UPON AND CLEANING AN EXPOSED SURFACE OF ONE OF THE SECURED METAL SHEETS, WHEN ROTATABLY FORCED BY THE ROTARY CLAMPING MEMBER INTO ENGAGEMENT THEREWITH, THE OTHER ROTARY CLAMPING MEMBER BEING ASSOCIATED WITH MEANS FORM IMPINGING UPON AND CLEANSING AN EXPOSED WORK SURFACE OF THE OTHER METAL SHEET WHEN FORCED INTO ENGAGEMENT THEREWITH BY SAID OTHER ROTARY CLAMPING MEMBER TO PROVIDE AN ELECTRICAL CONNETION THROUGH THE CLAMPING MEMBERS TO EACH OF THE METAL SHEETS.