Gunsight drive linkage

Claim 1

A GUNSIGHT DRIVE LINKAGE COMPRISING, IN COMBINATION, ROTATABLE MEANS INCLUDING A GEAR SECTOR FOR ELEVATING A GUN ABOUT A FIRST CENTER OF ROTATION, A PIVOT PLATE SPACE THEREFROM AND ADAPTED TO ROTATE ABOUT A SECOND CENTER OF ROTATION, A PAIR OF ARMS PIVOTALLY CONNECTING AT ENDS THEREOF SAID ROTATABLE MEANS AND SAID PIVOT PLATE AT POINTS SPACED RADIALLY FROM THE RESPECTIVE SAID FIRST AND SECOND CENTERS OF ROTATION AND CONSTITUTING A PARALLELOGRAM LINKAGE PROVIDING CORRESPONDING ROTATION OF SAID ROTATABLE MEANS AND SAID PIVOT PLATE THROUGH SAID ARMS, A FIRST GEAR FIXED TO SAID PIVOT PLATE, A FIRST HOUSING ROTATABLY SUPPORTED ON SAID PIVOT PLATE, A RACK SLIDABLY SUPPORTED IN SAID FIRST HOUSING IN ENGAGEMENT WITH SAID FIRST GEAR, A SECOND HOUSING HELD IN CONNECTED SPACED RELATION TO SAID FIRST HOUSING BY A COMMON CONNECTING MEMBER, A SHAFT ROTATABLY JOURNALED IN SAID SECOND HOUSING, A SECOND GEAR KEYED TO SAID SHAFT WITHIN SAID SECOND HOUSING AND IN ENGAGEMENT WITH SAID RACK, ROTATION OF SAID SHAFT THEREBY BEING RESPONSIVE TO ROTATION OF SAID SECOND GEAR WHICH THROUGH SAID RACK, FIRST GEAR AND ARMS IS RESPONSIVE TO ROTATION OF SAID ROTATABLE MENAS, AND A GUNSIGHT FIXED TO SAID SHAFT AND THEREBY RESPONSIVE TO ELEVATION OF THE GUN.