Gear-type adjusting mechanism for variable focal length objectives

Claim 1

A LENS ASSEMBLY FOR CAMERAS INCLUDING A MOUNTING MEMBER (1), AND AXIALLY MOVABLE FRONT (2) AND REAR (3) LENS MEMBERS DISPOSED WITHIN SAID MOUNTING MEMBER (1), MEANS FOR MOVING SAID LENS MEMBERS SYNCHRONOUSLY AND ALSO PERMITTING MOVEMENT OF ONE OF SAID LENS MEMBER INDEPENDENTLY OF THE OTHER, SAID MEANS COMPRISING, A DRIVE SHAFT (12) ROTATABLY SECURED IN SAID MOUNTING MEMBER (1), ACTUATING MEANS (27) FIXED TO SAID DRIVE SHAFT FOR ROTATION THEREOF, CAM MEANS (11) FIXED TO SAID DRIVE SHAFT TO DISPLACE SAID REAR LENS MEMBER (3) WHEN SAID DRIVE SHAFT IS ROTATED, A FIRST GEAR (26) FIXED TO SAID DRIVE SHAFT, A SECOND GEAR (20) ROTATABLE ON SAID DRIVE SHAFT, FIRST COUPLING MEANS (23, 21, 22) CONNECTING SAID FIRST (26) AND SECOND (20) GEARS TO EACH OTHER AND SECOND COUPLING MEANS (17) CONNECTING SAID SECOND GEAR (20) TO SAID FRONT LENS MEMBER (2) TO PERMIT SYNCHRONOUS MOVEMENT OF SAID LENS MEMBERS UPON ROTATION OF SAID DRIVE SHAFT (12) BY SAID ACTUATING MEANS (27), SAID FIRST COUPLING MEANS INCLUDING A PAIR OF SATELLITE GEARS (21, 22) ROTATABLY MOUNTED ON A COMMON AXIS AND MOVABLE IN UNISON ON A SUPPORT MEMBEER (23) ROTATABLE ON SAID DRIVE SHAFT, ONE OF SAID SATELLITE GEARS (22) IN ENGAGEMENT WITH SAID FIRST GEAR (26) AND THE OTHER SATELLITE GEAR (21) IN ENGAGEMENT WITH SAID SECOND GEAR (20), AND MEANS (25) ROTATING SAID SUPPORT MEMBER (23) TO DISPLACE THE AXIS OF SAID SATELLITE GEARS (21, 22) RELATIVE TO SAID DRIVE SHAFT (12) TO PERMIT INDEPENDENT MOVEMENT OF SAID FRONT LENS MEMBER (2).