Movable stair assembly

Claim 1

A MOVABLE STAIR ASSEMBLY ADAPTED FOR USE AS AN EMERGENCY PASSAGE FROM A VEHICLE SUCH AS A MOBILE LOUNGE, SAID ASSEMBLY COMPRISING: TRACK MEANS ADAPTED TO BE MOUNTED ON THE VEHICLE; A CARRIAGE MOVABLE ALONG SAID TRACK MEANS BETWEEN FIRST AND SECOND POSITIONS; MEANS BIASING SAID CARRIAGE TOWARDS SAID SECOND POSITION; RELESABLE MEANS FOR HOLDING SAID CARRIAGE IN SAID FIRST POSITION AGAINST THE FORCE OF SAID BIASING MEANS; A FOLDABLE STAIR UNIT MOVABLE BETWEEN A STOWED POSITION AND AN ERECTED POSITION, SAID STAIR UNIT COMPRISING AN UPPER SECTION AND A LOWER SECTION HINGED TO SAID UPPER SECTION FOR PIVOTAL MOVEMENT BETWEEN A STOWED POSITION BENEATH SAID UPPER SECTION AND AN ERECTED POSITION ALIGNED WITH SAID UPPER SECTION; MEANS PIVOTING SAID UPPER SECTION TO SAID CARRIAGE SO THAT WHEN SAID CARRIAGE OCCUPIES SAID FIRST AND SECOND POSITIONS SAID STAIR UNIT IS STOWED AND ERECTED RESPECTIVELY, THE MOVEMENT OF SAID CARRIAGE FROM SAID FIRST POSITION TO SAID SECOND POSITION UPON RELEASE OF SAID RELEASABLE MEANS ALLOWING MOVEMENT OF SAID STAIR UNIT INTO SAID ERECTED POSITION; A PAIR OF HANDRAILS CARRIED ON POSTS HINGED TO SAID UPPER SECTION; AND MEANS FOR AUTOMATICALLY ERECTING SAID POSTS AND HANDRAILS UPON MOVEMENT OF SAID STAIR UNIT TO SAID ERECTED POSITION.