Removable brush head cover with threaded handle nut

Claim 1

A HOLLOW REMOVABLE BRUSH HEAD COVER CONSTRUCTED OF A RELATIVELY RIGID BUT RESILIENT MATERIAL ADAPTED TO BE REMOVABLY SECURED ABOUT THE UPPER PORTION OF A BRUSH HEAD AND HAVING A CYLINDRICAL POCKET FORMED IN THE UPPER SURFACE THEREOF INCLUDING A BOTTOM WHOSE UNDERSURFACE IS ADAPTED TO ABUT AGAINST THE UPPER SURFACE OF SAID BRUSH HEAD, AN IMPROVED NUT TO SECURE A HANDLE TO SAID BRUSH HEAD, SAID NUT HAVING A LOWER PORTION AND AN ENLARGED UPPER PORTION DEFINING AN ANNULAR SHOULDER, SAID LOWER PORTION BEING SNUGLY RECEIVED AND FIXEDLY SECURED IN SAID POCKET WITH THE LOWER SURFACE OF SAID SHOULDER ABUTTING AGAINST THE UPPER SURFACE OF SAID COVER AND THE BOTTOM OF SAID LOWER PORTION ABUTTING AGAINST THE BOTTOM OF SAID POCKET, AN UPWARDLY AND OUTWARDLY FLARING THREADED BLIND BORE IN SAID NUT HAVING A BOTTOM WALL DEFINING A CLOSURE FOR THE LOWER END OF SAID BORE, SAID NUT BEING CONSTRUCTED OF A RELATIVELY RIGID BUT SLIGHTLY RESILIENT MATERIAL WHEREBY THE THREADS OF SAID TAPERED BORE WILL CUT AT LEAST PARTIAL THREADS IN THE TAPERED PORTION OF A BRUSH HANDLE SECURED THEREINTO AND THE SECUREMENT OF A HANDLE IN SAID NUT WILL SLIGHTLY FLEX THE WALLS OF SAID NUT OUTWARDLY INTO TIGHTER FRICTIONAL ENGAGEMENT WITH THE CONFRONTING SURFACES OF SAID POCKET.