Viscosity measuring device

Claim 1

A DEVICE FOR MEASURING THE VISCOSITY OF A LIQUID HAVING, IN COMBINATION, A SOURCE OF SAID LIQUID MAINTAINED UNDER PRESSURE AND A CYLINDER CLOSED AT ONE END AND COMMUNICATING WITH SAID SOURCE AT A VALVE OPENING, A CHAMBER FILLED WITH SAID LIQUID AND DEFINED BY THE OPPOSITE END PORTION OF SAID CYLINDER AND THE END OF A HOLLOW PLUNGER SLIDABLE IN THE CYLINDER, A SPRING URGING THE PLUNGER TOWARD SAID CLOSED CYLINDER END, A FLOW RESTRICTING ORIFICE EXTENDING THROUGH SAID PLUNGER END AND TO SAID CHAMBER, MEANS ON SAID PLUNGER COOPERATING WITH ONE EDGE OF SAID OPENING TO FORM A VALVE RESPONSIVE TO THE OPPOSING FORCES EXERTED ON SAID PLUNGER BY THE PRESSURE THEREIN AND BY SAID SPRING AND CONTROLLING THE ADMISSION OF LIQUID FROM SAID SOURCE TO THE INTERIOR OF SAID PLUNGER SO AS TO MAINTAIN A CONSTANT PRESSURE DROP ACROSS SAID ORIFICE AND A CONSTANT FLOW INTO SAID CHAMBER, MEANS DEFINING AN OUTLET ORIFICE ALLOWING LIQUID SUPPLIED THROUGH SAID FIRST ORIFICE TO ESCAPE CONTINUOUSLY FROM SAID CHAMBER TO A LOW PRESSURE SPACE AT A RATE INVERSELY PROPORTIONAL TO THE VISCOSITY OF THE LIQUID, MEANS FOR SENSING CHANGES IN THE PRESSURE IN SAID CHAMBER AS AN INDICATION OF VISCOSITY OF SAID LIQUID, AND MEANS ALONG SAID PLUNGER AND CYLINDER BETWEEN SAID VALVE AND SAID CHAMBER FOR TRAPPING AND DIVERTING OUT OF THE CYLINDER TO A LOW PRESSURE SPACE ANY OF SAID LIQUID WHICH LEAKS ALONG THE EXTERIOR OF THE PLUNGER TOWARD SAID CHAMBER.

Claim 2

A DEVICE FOR MEASURING THE VISCOSITY OF A LIQUID HAVING, IN COMBINATION, A SOURCE OF SAID LIQUID MAINTAINED UNDER PRESSURE AND A CYLINDER CLOSED AT ONE END AND COMMUNICATING WITH SAID SOURCE AT A VALVE OPENING, A CHAMBER FILLED WITH SAID LIQUID AND DEFINED BY THE OPPOSITE END PORTION OF SAID CYLINDER AND THE END OF A HOLLOW PLUNGER SLIDABLE IN THE CYLINDER, A SPRING URGING THE PLUNGER TOWARD SAID CLOSED CYLINDER END, A FLOW RESTRICTING ORIFICE EXTENDING THROUGH SAID PLUNGER END AND TO SAID CHAMBER, MEANS ON SAID PLUNGER COOPERATING WITH ONE EDGE OF SAID OPENING TO FORM A VALVE RESPONSIVE TO THE OPPOSING FORCES EXERTED ON SAID PLUNGER BY THE PRESSURE THEREIN AND BY SAID SPRING AND CONTROLLING THE ADMISSION OF LIQUID FROM SAID SOURCE TO THE INTERIOR OF SAID PLUNGER SO AS TO MAINTAIN A CONSTANT PRESSURE DROP ACROSS SAID ORIFICE AND A CONSTANT FLOW INTO SAID CHAMBER, MEANS DEFINING AN OUTLET ORIFICE ALLOWING LIQUID SUPPLIED THROUGH SAID FIRST ORIFICE TO ESCAPE CONTINUOUSLY FROM SAID CHAMBER TO A LOW PRESSURE SPACE AT A RATE INVERSELY PROPORTIONAL TO THE VISCOSITY OF THE LIQUID, MEANS FOR SENSING CHANGES IN THE PRESSURE IN SAID CHAMBER AS AN INDICATION OF VISCOSITY OF SAID LIQUID, AND MEANS ALONG SAID PLUNGER AND CYLINDER BETWEEN SAID VALVE AND SAID CHAMBER FOR TRAPPING AND DIVERTING OUT OF THE CYLINDER TO A LOW PRESSURE SPACE ANY OF SAID LIQUID WHICH LEAKS ALONG THE EXTERIOR OF THE PLUNGER TOWARD SAID CHAMBER.