Safety lock

Claim 1

A SAFETY LOCK COMPRISING A PLURALITY OF SUPERPOSED DISCS EACH HAVING A NOTCH AND A TOOTHED PORTIN ON THE CIRCUMFERENTIAL EDGE THEREOF, AN AXLE ON WHICH SAID DISCS ARE FREELY ROTATABLY MOUNTED, A PLURALITY OF TOOTHED STRIPS, ONE FOR EACH OF SAID DISCS, AND EACH HAVING A TOOTHED PORTION ON ONE EDGE THEREOF ENGAGEABLE WITH THE TOOTHED PORTION OF ONE OF SAID DISCS, AND A TOOTHED PORTION ON THE OPPOSITE EDGE THEREOF, A PLURALITY OF LEVERS, ONE FOR EACH TOOTHED STRIP AND EACH HAVING A TOOTH THEREON ENGAGEABLE BETWEEN THE TEETH OF SAID TEETH PORTION ON SAID OPPOSITE EDGE, OF SAID STRIP, AND A FINGER PORTION SPACED FROM SAID TOOTH, A LEVER CARRYING PLATE ON WHICH SAID LEVERS ARE PIVOT ALLY MOUNTED IN SUPERIMPOSED POSITION, SAID LEVER CARRYING PLATE BEING VERTICALLY RECIPROCALLY MOVABLE, A ROTATABLE SELECTOR AXLE HAVING A KNOB ON ONE END THEREOF AND EXTENDING BETWEEN THE SPACE BETWEEN SAID TEETH AND SAID FINGERS ON SAID LEVERS AND PROVIDED WITH A PLURALITY OF GROOVES AXIALLY AND CIRCUMFERENTIALLY SPACED FROM EACH OTHER AND ADAPTABLE TO RECEIVE ONE OF SAID FINGERS ON SAID LEVER ON ROTATION OF SAID SELECTOR AXLE IN A FIRST DIRECTION, SPRING MEANS BEARING AGAINST SAID LEVER URGING SAID FINGERS INTO ENGAGEMENT WITH SAID GROOVES, WHEREBY WHEN A FINGER ENGAGES A GROOVE THE TOOTH ON THE LEVER IS ENGAGED WITH ONE OF SAID STRIPS, SAID SELECTOR AXLE HAVING A LONGITUDINALLY EXTENDING BORE THERETHOUGH, A FEELER AXLE MOUNTED FOR LONGITUDINAL RECIPROCATION IN SAID SELECTOR AXLE BORE AND HAVING A KNOB ON ONE END THEREOF ADJACENT SAID SELECTOR KNOB, THE OTHER END OF SAID FEELER AXLE FIXEDLY ATTACHED TO A WEDGE MEMBER HAVING AN INCLINED SURFACE, A FEELER PLATE MOUNTED FOR VERTICAL RECIPROCATION HAVING ADJACENT ONE END AN APERTURE THEREIN TO RECEIVE SAID WEDGE MEMBER AND ADJACENT THE OTHER END PROJECTING MEANS ENGAGEABLE WITH SAID LEVER CARRYING PLATE WHEREBY ON LONGITUDINAL RECIPROCATION OF SAID FEELER AXLE A PREDETERMINED NUMBER OF TIMES THE INCLINED SURFACE OF SAID WEDGE IS RECEIVED IN THE APERTURE OF SAID FEELER PLATE TO MOVE THE SAME UPWARDLY SO THAT THE PROJECTING MEMBERS THEREOF ENGAGE SAID LEVER CARRYING PLATE TO MOVE SAID PLATE ENGAGE SAID LEVER CAUSING THE TOOTH OF SAID LEVER TO MOVE UPWARDLY A PREDETEMINED NUMBER OF TIMES WHEREBY SAID DISC IS ROTATED THROUGH A PREDETERMINED ANGLE TO LOCATE THE NOTCH THEREOF AT A PRESELECTED POSITION, AN AXIALLY EXTENDING BAR MOUNTED ON A PIVOTABLE LEVER, SAID BAR BEARING AGAINST THE PERIPHERY OF SAID NOTCHED DISCS, SAID PIVOTABLE LEVER BEING IN CAMMING ENGAGEMENT WITH A VERTICALLY RECIPROCABLE LOCKING PLATE, SPRING MEANS URGING SAID LOCKING PLATE IN A LOCKING POSITION, SECOND PIVOTABLE LEVER MEANS ENGAGING AT ONE END THEREOF WITH SAID LOCKING PLATE AND AT THE OTHER END WITH PAWL MEANS PROVIDED ON SAID SELECTOR AXLE WHEREBY ON LOCATING SAID NOTCHES OF SAID DISCS AT SAID PRESELECTED POSITION TO RECEIVE SAID AXIALLY EXTENDING BAR SAID SELECTOR AXLE IS ROTATED IN A SECOND DIRECTION SO THAT SAID PAWL MEANS ENGAGES SAID SECOND PIVOTABLE LEVER MEANS ENGAGING SAID LOCKING PLATE THEREBY URGING SAID LOCKING PLATE INTO AN UNLOCKING POSITION AND SIMULTANEOUSLY URGING SAID AXIALLY EXTENDING BAR INTO SAID NOTCHES.