Tramway rope displacement indicator

Claim 1

IN AN AERIAL TRAMWAY HAVING AN ENDLESS CIRCULATING TRACTION ROPE GUIDED BY ROPE SUPPORTING SHEAVES SUPPORTED ON TOWERS, MEANS OF THE NATURE AFORESAID FOR INDICATING DISPLACEMENT OF SAID ROPE FROM ITS PREDETERMINED RELATION SHIP WITH SAID ROPE SUPPORTING SHEAVES, COMPRISING IN COMBINATION: A SHEAVE FRAME JOURNALLED ON A SUBSTANTIALLY HORIZONTAL AXIS ON SAID TOWER, FOR TILTING IN A SUBSTANTIALLY VERTICAL PLANE; MORE THAN ONE ROPE SUPPORTING SHEAVE JOURNALED ON SAID SHEAVE FRAME FOR ROTATION IN A PLANE SUBSTANTIALLY PARALLEL TO THE PLANE OF SAID TILTING MOVEMENT WITH THE AXIS OF AT LEAST ONE OF SAID SHEAVES LATERALLY OFFSET FROM A LINE THROUGH SAID SHEAVE JOURNAL AND THE POINT OF CONTACT OF SAID TRACTION ROPE WITH THE IMMEDIATELY AFORESAID SHEAVE SO THAT FORCE OF SAID TRACTION ROPE MAINTAINS SAID SHEAVE FRAME IN A FIRST NORMAL PIVOTAL POSITIONS;