Gear driven screwdriver

Claim 1

A GEAR-DRIVING MECHANISM COMPRISING A DRIVING ELEMENT, A DRIVEN ELEMENT, MEANS INTERCONNECTING SAID DRIVING AND DRIVEN ELEMENTS FOR RELATIVE ROTARY MOVEMENT ABOUT A COMMON AXIS, A DRIVING GEAR FIXED COAXIALLY TO THE DRIVING ELEMENT FOR ROTARY MOVEMENT THEREWITH, A DRIVEN GEAR FIXED COAXIALLY TO THE DRIVEN ELEMENT FOR ROTARY MOVEMENT THEREWITH, A TRANSMISSION HOUSING ROTATABLY CARRIED BY SAID MECHANISM FOR NORMALLY FREE ROTATION ABOUT SAID COMMON AXIS WITH RESPECT TO BOTH OF SAID ELEMENTS, TRANSMISSION GEARING DISPOSED IN SAID HOUSING FOR ROTATION ABOUT A SECOND AXIS SPACED FROM AND PARALLEL TO SAID COMMON AXIS, SAID TRANSMISSION GEARING COMPRISING A PAIR OF AXIALLY ALIGNED GEAR MEMBERS INTERCONNECTED FOR ROTATION TOGETHER ABOUT SAID SECOND AXIS, AND RESPECTIVELY INTERMESHING WITH SAID DRIVING AND DRIVEN GEARS, A GEAR LATCH CARRIED BY SAID HOUSING AND SELECTIVELY OPERABLE TO IMMOBILIZE SAID TRANSMISSION GEARING WHEREBY TO ESTABLISH A DIRECT DRIVING CONNECTION BETWEEN SAID DRIVING AND DRIVEN MEMBERS, SAID TRANSMISSION GEAR MEMBERS BEING OF RELATIVELY DIFFERENT DIAMETERS, SAID GEAR LATCH COMPRISING A STUD GUIDED WITHIN THE HOUSING FOR AXIAL MOVEMENT AND PROJECTING RADIALLY INWARDLY OF THE HOUSING TOWARD SAID SECOND AXIS FOR AXIAL MOVEMENT INTO AND FROM INTERLOCKING RELATION BETWEEN ADJOINING GEAR TEETH OF THE LARGER DIAMETER TRANSMISSION GEAR MEMBER, SAID LATCH TERMINATING SHORT OF THE PATH OF ROTATION OF SAID TEETH OF THE SMALLER DIAMETER GEAR MEMBER, WHEREBY TO PERMIT ROTATION OF SAID GEARS WHEN POSITIONED AXIALLY ABREAST OF SAID SMALLER DIAMETER GEAR MEMBER.