Doctor blade

Claim 1

A DOCTOR BLADE STRUCTURE FOR USE IN COATING SHEETS AND WEBS THAT COMPRISES AN ELONGATED ROD WORKING MEMBER; A HOLDER MEANS FOR REVOLVABLY SUPPORTING SAID ROD THROUGHOUT THE WORKING LENGTH OF SAID ROD, SAID HOLDER INCLUDING A FIRST AND SECOND HOLDER ELEMENT, EACH CONSISTING IN A STRIP OF PREDETERMINED CROSSSECTION, SAID FIRST HOLDER ELEMENT HAVING A CROSS-SECTIONAL SHAPE IN THE FORM OF A QUESTION MARK HAVING A LOOPED UPPER END THAT ENDS IN A TERMINAL EDGE IN CLOSE CONTACT WITH THE ROD CIRCUMFERENCE THROUGHOUT THE WORKING LENGTH OF THE ROD AND AN ANGULAR TAIL DEPENDING THEREFROM, SAID ROD BEING AT LEAST PARTIALLY RECEIVED IN SAID UPPER END, SAID SECOND HOLDER ELEMENT BEING FASTENED TO SAID FIRST HOLDER ELEMENT AND HAVING ANOTHER TERMINAL EDGE IN CLOSE CONTACT WITH THE ROD CIRCUMFERENCE SPACED APART LESS THAN HALF THE ROD CIRCUMFERENCE FROM THE FIRST-SAID TERMINAL EDGE, THEREBY TO REVOLVABLY EMBRACE SAID ROD THROUGHOUT THE WORKING LENGTH OF THE ROD BETWEEN THE TERMINAL EDGES OF THE FIRST AND SECOND ELEMENTS, SAID UPPER END OF SAID FIRST ELEMENT AT A POSITION REMOVED FROM THE FIRST-SAID EDGE DEFINING PART OF THE BOUNDARY A CAVITY FOR THE PASSAGE THERETHROUGH OF A FLUID FOR CLEANSING SAID ROD; SAID ROD CIRCUMFERENCE FORMING AN ADDITIONAL PART OF THE CAVITY BOUNDARY; AND FIRST AND SECOND PORT MEANS IN SAID HOLDER, BOTH COMMUNICATING WITH SAID CAVITY AND BEING SPACED APART LONGITUDINALLY ALONG SAID HOLDER, AT LEAST ONE OF WHICH PORT MEANS IS INTERMEDIATE THE ENDS OF SAID HOLDER, FOR INTRODUCING ROD WASHING FLUID INTO SAID CAVITY VIA ONE OF SAID MEANS AND WITHDRAWING SUCH FLUID VIA AND THE OTHER OF SAID PORT MEANS.