Weather seal for cylinder lock mechanism

Claim 1

A LOCK OF THE TYPE COMPRISING A BODY WITH A BORE OPENING TO ITS FRONT, A CYLINDER ROTATABLE IN THE BORE AND HAVING A FORWARDLY OPENING KEY SLOT, AN ANNULAR BEZEL SECURED TO THE FRONT OF THE LOCK BODY AND THROUGH WHICH A KEY CAN BE INSERTED INTO THE KEY SLOT IN THE CYLINDER A CAP BEHIND THE BEZEL BIASED FORWARDLY INTO ENGAGEMENT WITH THE BEZEL TO CLOSE THE OPENING THEREIN, SAID CAP HAVING A KEY APETURE WHICH REGISTERS WITH THE KEY SLOT IN THE CYLINDER, AND A SHUTTER BEHIND THE CAP NORMALLY BIASED TO A CLOSED POSITION FLATWISE OVERLYING THE REAR FACE OF THE CAP, ACROSS THE KEY APETURE, BUT MOVABLE TO A POSITION CLEARING THE KEY APETURE BY A KEY PUSHED THROUGH THE KEY APETURE AND INTO THE KEY SLOT, SAID LOCK BEING CHARACTERIZED BY: A PAIR OF REARWARDLY PROJECTING SPACED APART LUGS ON THE CAP, BOTH LOCATED ON THE SAME SIDE OF THE KEYHOLE APERTURE; AND A HINGE PIN CARRIED BY SAID LUGS AND ON WHICH THE SHUTTER IS HINGEDLY CARRIED FOR SWINGING MOTION TOWARD AND FROM ITS CLOSED POSITION.