Adjustable and retractable hand reamer device

Claim 1

A REAMING DEVICE OF THE CHARACTER DESCRIBED COMPRISING, A TUBULAR CASING HAVING A CYLINDRICAL AXIAL BORE THEREIN WHICH IS CLOSED AT ONE END THEREOF BY AN END WALL HAVING A CENTRAL APERTURE THEREIN AND IS OPEN AT THE OTHER END THEREOF, A PLUG SLIDABLY MOUNTED IN SAID BORE, AN ELONGATED LONGITUDINALLY EXTENDING NARROW SLOT IN ONE SIDE OF SAID CASING, SAID PLUG HAVING AN AXIAL BORE IN ONE END THEREOF AND A PAIR OF SPACED PARALLEL INTERNALLY THREADED RADIAL BORES ONE OF WHICH INTERSECTS THE SAID AXIAL BORE IN SAID PLUG, A CLIP HAVING A SPRING TONGUE WHICH IS DISPOSED OVER SAID SLOT AND A PAIR OF SPRING FINGERS WHICH YIELDABLY GRIP THE OUTER WALL OF SAID CASING, A, THUMB SCREW HAVING AN ENLARGED HEAD AND A THREADED SHANK WHICH IS INSERTED THROUGH AN APERTURE IN SAID CLIP AND THROUGH SAID SLOT AND IS THREADED INTO THE OTHER OF SAID RADIAL BORES, AN ELONGATED REAMING TOOL HAVING A TAPERED BODY PORTION AND A SHANK WHICH IS CLAMPED IN THE SAID AXIAL BORE IN SAID PLUG BY A SET SCREW THREADED INTO THE SAID ONE OF SAID RADIAL BORES, THE TAPERED BODY PORTION OF SAID TOOL PROGRESSIVELY INCREASING IN CROSS-SECTIONAL AREA FROM THE OUTER END THEREOF TO THE SAID SHANK THEREOF, SAID PLUG BEING ADPATED TO BE MOVED BACK AND FORTH IN THE SAID CYLINDRICAL BORE IN SAID CASING TO PROJECT AND REAMING TOOL OUT FROM SAID CASING THROUGH THE SAID APERTURE IN SAID END WALL AND TO RETRACT SAID TOOL BACK INTO SAID CASING, THE LENGTH OF SAID CASING BEING GREATER THAN THE COMBINED LENGTH OF SAID PLUG AND SAID TOOL, AND SAID CLIP BEING MOVABLE ALONG WITH SAID PLUG, A GRADUATED SCALE ON THE OUTER WALL OF SAID CASING ADJACENT ONE SIDE OF SAID SLOT, SAID SCALE BEING CALIBRATED IN ACCORDANCE WITH THE DECREASING CROSS-SECTIONAL AREA OF THE SAID BODY PORTION OF SAID TOOL, AN INDEX MARK ON SAID CLIP WHICH IS ADAPTED TO COOPERATE WITH SAID SCALE TO INDICATE THE SIZE OF SAID BODY PORTION AT THE OUTER END OF SAID APERTURE, SAID PLUG AND SAID CLIP BEING ADAPTED TO BE CLAMPED IN ADJUSTED POSITION BY THE TIGHTENING OF SAID THUMB SCREW.