Chemical compound applicator for threaded fasteners

Claim 1

AN APPLICATOR FOR APPLYING A PAIR OF CIRCUMFERENTIALLY SPACED BANDS OF CHEMICAL COMPOUNDS LENGTHWISE ALONG THE SHANK OF A FASTENER, SAID APPLICATOR COMPRISING A HOUSING PROVIDED WITH A STRAIGHT PASSAGE THERETHROUGH HAVING A REAR END AND A FRONT END, A PISTON SLIDABLY MOUNTED IN THE PASSAGE AND PROJECTING FROM SAID REAR END, MEANS OPERATIVELY CONNECTED WITH THE REAR END OF THE PISTON FOR NORMALLY POSITIONING ITS FRONT END IN THE FRONT END OF THE PASSAGE TO CLOSE IT, THE HOUSING BEING PROVIDED AT OPPOSITE SIDES OF SAID PASSAGE ADJACENT THE FRONT END OF THE PASSAGE WITH CHAMBERS EXTENDING ALONG THE PASSAGE AND OPENING INTO IT, THE INNER SIDES OF SAID CHAMBERS BEING SPACED APART AND NORMALLY BEING CLOSED BY THE PISTON, THE HOUSING HAVING AN INLET PORT FOR EACH CHAMBER, AND MEANS FOR DELIVERING A DIFFERENT CHEMICAL COMPOUND TO EACH PORT UNDER PRESSURE TO MAINTAIN SAID CHAMBERS FULL OF THE COMPOUNDS, THE PISTON BEING MOVABLE REARWARDLY WHEN ITS FRONT END IS ENGAGED BY AN AXIALLY ALIGNED FASTENER SHANK HAVING A DIAMETER NO GREATER THAN THE DIAMETER OF THE PISTON, WHEREBY THE FASTENER CAN ENTER SAID PASSAGE TO RECIEVE COATINGS OF SAID COMPOUNDS IN TWO SPACED BANDS EXTENDING LENGTHWISE OF THE FASTENER.