Hydraulic drive means for a swinging door or the like

Claim 1

AN ARRANGEMENT OF THE CHARACTER DESCRIBED, COMPRISING IN COMBINATION, SUPPORT MEANS; A DOOR MOUNTED ON SAID SUPPORT MEANS TURNABLY BETWEEN TWO END POSITIONS ABOUT A TURNING AXIS; A CYLINDER MEMBER; A PISTON MEMBER MOVABLE IN SAID CYLINDER MEMBER BETWEEN OPPOSITE ENDS THEREOF AND INCLUDING A PISTON ROD PROJECTING WITH ONE END THEREOF BEYOND SAID CYLINDER MEMBER, ONE OF SAID TWO MEMBERS BEING PIVOTALLY MOUNTED AT ONE END THEREOF TO SAID SUPPORT MEANS; MEANS FOR FEEDING FLUID UNDER PRESSURE INTO ONE END OF SAID CYLINDER MEMBER AND FOR DISCHARGING THE FLUID FROM THE OPPOSITE END THEREOF AND VICE VERSA FOR RECIPROCATING SAID PISTON MEMBER IN SAID CYLINDER MEMBER; LEVER MEANS MOUNTED ON SAID SUPPORT MEANS PIVOTABLE ABOUT A PIVOT AXIS AND PIVOTALLY CONNECTED AT A PORTIONS THEREOF TO THAT END OF THE OTHER OF SAID TWO MEMBERS WHICH IS FARTHEST FROM THE END AT WHICH SAID ONE MEMBER IS PIVOTALLY MOUNTED ON SAID SUPPORT TO BE MOVED BETWEEN TWO END POSITIONS DURING MOVEMENT OF SAID PISTON MEMBER BETWEEN THE ENDS OF SAID CYLINDER MEMBER; ELONGATED SUBSTANTIALLY STRAIGHT GUIDE MEANS PIVOTALLY CONNECTED AT ONE END THEREOF TO SAID SUPPORT MEANS FOR PIVOTING MOVEMENT ABOUT A TILTING AXIS, SAID GUIDE MEANS HAVING A LENGTH AT LEAST EQUAL TO THE DISTANCE BETWEEN SAID PIVOT AXIS AND A FREE END OF SAID LEVER MEANS AND BEING OPERATIVELY CONNECTED TO SAID DOOR FOR TURNING THE LATTER ABOUT SAID TURNING AXIS DURING TILTING MOVEMENT OF SAID GUIDE MEANS; AND ENGAGING MEANS PROJECTING FROM SAID FREE END OF SAID LEVER MEANS AND ENGAGING SAID GUIDE MEANS FOR TILTING THE LATTER ABOUT SAID TILTING AXIS DURING PIVOTAL MOVEMENT OF SAID LEVER MEANS, SAID LEVER MEANS AND GUIDE MEANS BEING ARRANGED WITH RESPECT TO EACH OTHER AND TO SAID DOOR IN SUCH A MANNER THAT IN EITHER END POSITION OF SAID LEVER MEANS SAID DOOR IS IN A CORRESPONDING END POSITION AND THE PORTION OF SAID LEVER MEANS BETWEEN SAID PIVOT AXIS AND SAID FREE END THEREOF INCLUDES AND ANGLE OF SUBSTANTIALLY 90* WITH SAID GUIDE MEANS, WHEREBY SAID DOOR WILL BE FIXEDLY HELD IN EITHER END POSITION AND CAN BE MOVED ONLY BY FEEDING PRESSURE FLUID INTO ONE END OF SAID CYLINDER MEMBER AND DISCHARGING PRESSURE FLUID FROM THE OTHER END THEREOF.