Hoist for use in combination with bathtub

Claim 1

IN COMBINATION, A BATHTUB; A SELF-CONTAINED, PORTABLE HOIST FOR USE BY INVALIDS AND THE LIKE, SAID HOIST COMPRISING A STATIONARY FRAME SUPPORTED SOLELY BY THE BATHTUB AND WHICH INCLUDES A BOTTOM PORTION RESTING UPON THE BATHTUB AND WHICH INCLUDES A SUBSTANTIALLY VERTICAL PORTION INTEGRALLY CONNECTED TO SAID BOTTOM PORTION, SAID VERTICAL PORTION INCLUDING TUBULAR MEMBERS AND A TUBULAR STATIONARY SLEEVE CLOSED AT ITS LOWER END AND CONNECTED WITH AND DISPOSED SUBSTANTIALLY VERTICALLY FROM SAID BOTTOM PORTION; A MOVABLE FRAME WHICH INCLUDES A SEAT PORTION, RIGIDLY ATTTACHED TO SAID MOVABLE FRAME, FOR SUPPORTING THE WEIGHT OF THE BATHTUB USER, AND WHICH INCLUDES AT LEAST TWO PAIRS OF ROLLERS ROTATABLY SUPPORTED BY SAID MOVABLE FRAME, EACH SAID PAIR OF ROLLERS BEING LOCATED WITH ONE OF SAID TUBULAR MEMBERS DISPOSED BETWEEN THE ROLLERS OF SAID PAIR TO CONFINE MOVEMENT OF SAID MOVABLE FRAME IN A DIRECTION PARALLEL TO SAID GUIDE MEANS; A TUBULAR MOVABLE SLEEVE CONNECTED TO SAID MOVABLE FRAME AND SLIDABLY DISPOSED WITHIN SAID STATIONARY SLEEVE; A PISTON DISPOSED WITHIN AND SLIDALE RELATIVE TO SAID MOVABLE SLEEVE, THE LOWER END OF SAID PISTON RESTING UPON THE LOWER END OF SAID STATIONARY SLEEVE; MEANS OPERABLE FOR INTRODUCING HYDRAULIC FLUID UNDER PRESSURE WITHIN SAID MOVABLE SLEEVE ABOVE SAID PISTON TO THEREBY RAISE SAID MOVABLE FRAME; AND AN ELONGATED ARM CONNECTED TO AND HAND ACTUABLE TO OPERATE SAID LAST-MENTIONED MEANS.