Overhead crane with skew control

Claim 1

IN AN OVERHEAD CRANE INCLUDING A BRIDGE HAVING A TRUCK AT EACH END THEREOF WITH THE TRUCKS INCLUDING WHEELS RIDING ON SUPPORTING RAILS OF A TRACKWAY, AND WITH THE BRIDGE BEING MOVED ALONG THE TRACKWAY BY DRIVING ONE OF THE WHEELS OF EACH TRUCK, THE IMPROVEMENT WHEREIN SAID CRANE INCLUDES: (A) MOTOR SYSTEM MEANS INCLUDING REVERSIBLE MOTOR MEANS FOR REVERSIBLY DRIVING SAID ONE WHEELS FOR SELECTIVELY MOVING SAID CRANE BRIDGE IN FORWARD OR REVERSE DIRECTIONS LONGITUDINALY OF THE TRACKWAY, (B) BRIDGE SKEW SENSITIVE DETECTING MEANS CARIED BY THE BRIDGE FOR CONTINUOUSLY AND UNINTERRUPTED DETECTING ANGULAR DISPLACEMENT OF THE BRIDGE WITH RESPECT TO THE TRACKWAY, (C) SAID BRIDGE SKEW SENSITIVE DETECTING MEANS INCLUDING A DATAUM MEMBER AND MEANS FOR CONTINUOUSLY MAINTAINING SAID DATUM MEMBER IN ALIGNMENT WITH SAID TRACKWAY. (D) AND BRIDGE FORWARD OR REVERSE MOVEMENT CONTROL MEANS OF THE NON-ENERGY INTRODUCING TYPE OPERATIVELY CONNECTED TO SAID MOTOR SYSTEM MEANS AND CONTINUOUSLY AND UNINTERRUPTEDLY RESPONSIVE TO SAID DETECTING MEANS FOR ADJUSTING THE RATE OF MOVEMENT OF THE BRIDGE ENDS, ON FORWARD OR REVERSE MOVEMENT, RESPECTIVELY, OF THE BRIDGE RELATIVE TO ITS TRACKWAY, AS REQUIRED TO MAINTAIN THE BRIDGE SQUARE WITH THE TRACKWAY, WHEREBY THE BRIDGE IS MAINTAINED SQUARE WITH THE TRACKWAY WITHOUT ADDING MOTIVE ENERGY TO SAID MOTOR SYSTEM MEANS TO MAINTAIN SAID SQUARE RELATIONSHIP, (E) SAID MOVEMENT CONTROL MEANS INCLUDING MEANS RESPONSIVE TO SAID DETECTING MEANS FOR ADJUSTING THE RATE OF MOVEMENT OF ONE OF THE BRIDGE ENDS ON FORWARD MOVEMENT OF THE BRIDGE IN ACCORDANCE WITH THE DEGREE OF ANGULAR DISPLACEMENT OF THE BRIDGE FROM SAID SQUARE RELATIONSHIP, (F) MEANS RESPONSIVE TO SAID DETECTING MEANS FOR ADJUSTING THE RATE OF MOVEMENT OF THE OTHER OF THE BRIDGE ENDS ON REVERSE MOVEMENT OF THE BRIDGE IN ACCORDANCE WITH THE DEGREE OF ANGULAR DISPLACEMENTOF THE BRIDGE FROM SAID SQUARE RELATIONSHIP, (G) AND MEANS FOR AUTOMATICALLY RENDERING THE RESPECTIVE ADJUSTING MEANS OPERATIVE ON REVERSAL OF DIRECTION OF MOVEMENT OF SAID BRIDGE.