Portable scaffolds and work towers

Claim 1

A PORTABLE WORK TOWER PARTICULARLY ADAPTED FOR USE IN VESSELS HAVING AN OPENING SMALLER THAN THE INTERIOR COMPRISING AN ELONGATED TOWER MEANS ADAPTED TO PASS THROUGH THE OPENING IN SAID VESSEL AND BE NORMALLY FREE STANDING, SAID TOWER MEANS INCLUDING UPPER AND LOWER PORTIONS HAVING SPACED APART VERTICALLY EXTENSING MEMBERS AT THE CORNERS OF A QUADRANGLE, SAID VERTICALLY EXTENDING MEMBERS ON THE LOWER PORTION BEING PROVIDED WITH CARRIER MEANS VERTICALLY MOVABLE THEREON, BASE MEANS ON THE LOWER PORTION ADAPTED TO ENGAGE THE VESSEL BOTTOM AT SPACED APART ADJUSTABLE LEVEL POINTS WHEREBY THE TOWER MAY BE LEVELLED AND SUPPOTED, A PLURALITY OF SUPPORT ARMS SPACED ABOUT SAID CARRIER MEANS AND PIVOTED THEREON FROM A POSITION PARALLEL TO THE LOWER PORTION OF THE TOWER TO A POSITION TRANSVERSE TO THE TOWER MEANS TO FORM A WORKING PLATFORM, SPACED CAGE GUIDES WITHIN THE UPPER AND LOWER PORTIONS FORMING AN INNER CAGE GUIDE EXTENDING FROM ADJACENT ONE END OF THE TOWER TO THE OPPOSITE END OF SAID TOWER, CAGE MEANS VERTICALLY MOVABLE ON SAID CAGE GUIDES WITHIN THE UPPER AND LOWER TOWER PORTIONS AND LIFT MEANS ON THE TOWER MEANS SELECTIVELY RAISING AND LOWERING THE CAGE MEANS, SAID CAGE MEANS BEING SELECTIVELY COUPLED WITH SAID CARRIER MEANS FOR RAISING AND LOWERING SAID CARRIER MEANS WITH SAID CAGE MEANS.