Safety ladder

Claim 1

A LADDER STRUCTURE COMPRISING A RIGID LOWER FRAME OF LIMITED HEIGHT HAVING INTERCONNECTED UPRIGHTS, HAND RAILS AND TRANSVERSE MEMBERS, A FLIGHT OF STEPS SECURED IN SAID FRAME BETWEEN SAID HAND RAILS, A PLATFORM AT THE TOP OF SAID FLIGHT SECURED TO THE TOP OF SAID LOWER FRAME, AND A RIGID EXTENSION PIVOTALLY SECURED TO A TOP EDGE OF SAID LOWER FRAME FOR SWINGING INTO UPRIGHT POSITION FOR EFFECTIVE VERTICAL EXTENSION OF THE LADDER STRUCTURE AND DOWN INTO A LOWERED POSITION FOR PASSAGE OF THE LADDER INTO LIMITED CLEARANCE SPACES, SAID EXTENSION COMPRISING AN OPEN FRAME AT EACH SIDE THEREOF DISPOSED LATERALLY BEYOND THE PLANES OF THE SIDES OF SAID LOWER FRAME WHEREBY TO OVERLAP SAID SIDES WHEN THE EXTENSION IS FOLDED DOWN, AND CROSS MEMBERS AT THE BACK BETWEEN SAID SIDE FRAMES WHEREBY TO PROVIDE A SUPPORT CELL IN WHICH ONE CAN SAFELY WORK WHILE STANDING ON SAID PLATFORM.