Stool with vertically movable seat

Claim 1

A VERTICALLY MOVABLE STOOL COMPRISING A SEAT, A VERTICALLY EXTENDING POST SUPPORTING SAID SEAT AND HAVING AN UPPER PORTION AND LOWER PORTION, A BASE SECURED TO SAID LOWER PORTION OF THE POST, SAID UPPER PORTION OF THE PORT COMPRISING AN ELONGATED VERTICAL TUBE, A SEAT SUPPORTING PLATE SECURED TO AND EXTENDING TRANSVERSELY OF SAID TUBE ADJACENT THE UPPER END THEREOF, A CONICAL HOUSING SECURED AT ITS MAXIMUM DIMENSION TO SAID PLATE AND TAPERING DOWNWARDLY TO A CONNECTION AT ITS MINIMUM DIMENSION TO SAID TUBE, SAID PLATE AND SAID HOUSING DEFINING A FLUID-TIGHT CHAMBER, SAID TUBE HAVING AN OPENING IN THE SIDE WALL THEREOF PROVIDING FLUID COMMUNICATION BETWEEN SAID CHAMBER AND THE INTERIOR OF THE TUBE, MEANS FOR SECURING THE PERIPHERAL PORTION OF SAID PLATE TO SAID SEAT ADJACENT THE PERIPHERY OF THE SEAT, A ROD COAXIALLY DISPOSED WITHIN SAID TUBE AND SUPPORTED FOR AXIAL MOVEMENT RELATIVE TO THE TUBE, MEANS FOR SEALING THE UPPER END OF THE TUBE, AND A HEAD SECURED TO THE LOWER END OF SAID TUBE, SAID HEAD HAVING A CENTRAL BORE WITH A VALVE SEAT AND AN OUTER RECESS, SAID ROD HAVING A VALVE HEAD ADAPTED TO ENGAGE AND DISENGAGE SAID VALVE SEAT WITH VERTICAL MOVEMENTS OF THE ROD FOR SEALING AND UNSEALING THE INTERIOR OF THE TUBE, A DISC FLOW CONTROL AXIALLY MOVABLE WITHIN SAID OUTER RECESS BETWEEN AN OPEN POSITION FOR PERMITTING RELATIVELY FREE FLOW OF FLUID THROUGH THE RECESS AND A RELATIVELY CLOSED POSITION, SAID DISC FLOW CONTROL HAVING AN ORIFICE THEREIN FOR LIMITING FLUID FLOW THROUGH THE RECESS WHEN THE DISC FLOW CONTROL IS IN THE CLOSED POSITION, SAID LOWER PORTION OF THE POST COMPRISING AN UPRIGHT CYLINDER MOUNTED ON SAID BASE AND DISPOSED COAXIALLY ABOUT SAID TUBE, MEANS FOR SEALING SAID HEAD OF THE TUBE TO SAID CYLINDER, AND MEANS FOR VERTICALLY MOVING SAID ROD WHEREBY FLUID UNDER PRESSURE WITHIN SAID TUBE MOVES THROUGH THE BORE OF THE HEAD WITH MINIMUM RESISTANCE TO THE OUTSIDE OF THE TUBE WHEREBY TO MOVE THE TUBE AXIALLY OUT OF THE CYLINDER AND FLUID MOVES FROM THE CYLINDER OUTSIDE OF THE TUBE THROUGH THE BORE WITH MAXIMUM RESISTANCE TO THE INTERIOR OF THE TUBE WHEN THE TUBE IS MOVED AXIALLY INTO THE CYLINDER.