Adjustable head band

Claim 1

AN ADJUSTABLE HEAD BAND COMPRISING: (A) A FLEXIBLE STRAP ADAPTED TO ENCIRCLE THE WEARER''S HEAD WITH THE END PORTIONS THEREOF DISPOSED IN OVERLAPPING RELATION AND HAVING A PAIR OF COOPERATING LONGITUDINALLY ELONGATED SLOTS FORMED RESPECTIVELY IN SAID END PORTIONS RELATIVELY OPPOSITE EDGES OF SAID SLOTS BEING TOOTHED TO FORM STRAIGHT GEAR RACKS EXTENDING LONGITUDINALLY OF SAID STRAP, (B) A FLEXIBLE SLEEVE ENCLOSING THE OVERLAPPING END PORTIONS OF SAID STRAP, SAID STRAP END PORTIONS BEING LONGITUDINALLY SLIDABLE IN SAID SLEEVE, (C) A GEAR PINION CARRIED ROTATABLY BY SAID SLEEVE AND DISPOSED THEREIN, THE AXIS OF SAID PINION BEING DISPOSED GENERALLY RADIALLY TO THE LOOP OF SAID STRAP, SAID PINION BEING MESHED AT OPPOSITE SIDES THEREOF WITH THE RESPECTIVE GEAR RACKS OF SAID SLOTS, (D) A SHAFT AFFIXED TO SAID PINION AND EXTENDING AXIALLY THEREFROM TO A POINT EXTERNAL TO SAID SLEEVE (E) AN ANCHOR PLATE CARRIED FOR ROTATION AND AXIAL SLIDING MOVEMENT ON SAID SHAFT EXTERNALLY TO SAID SLEEVE AND NORMALLY TO SAID SHAFT, SAID ANCHOR PLATE HAVING A SERIES OF OUTWARDLY OPENING SOCKETS FORMED THEREIN AND ARRANGED IN A RING CONCENTRIC WITH SAID SHAFT, (F) MEANS PREVENTING ROTATION OF SAID ANCHOR PLATE RELATIVE TO SAID SLEEVE, (G) A DETENT PLATE CARRIED ON SAID SHAFT OUTWARDLY FROM SAID ANCHOR PLATE, SAID DETENT PLATE BEING AXIALLY SLIDABLE ON SAID SHAFT BUT SECURED AGAINST ROTATION THEREON, AND HAVING A SERIES OF ROUNDED INWARD PROJECTIONS FORMED THEREON IN COINCIDING RELATION TO THE SOCKETS OF SAID ANCHOR PLATE, SAID DETENT PLATE CONSTITUTING A MANUALLY ROTATABLE KNOB, AND (H) RESILIENT MEANS URGING SAID DETENT PLATE TOWARD AND AGAINST SAID ANCHOR PLATE, WHEREBY THE PROJECTIONS OF THE FORMER ARE ENGAGED IN THE SOCKETS OF THE LATTER TO RESIST YIELDABLY ANY RELATIVE ROTATION OF SAID PLATES.