Viscosity compensator for fluid damping devices

Claim 1

FOR USE IN A DEVICE FOR DAMPING THE MOVEMENT OF A MASS, OF THE KIND WHICH COMPRISES A CASING CONTAINING THE MOVABLE MASS TO BE DAMPED AND FORMING A FLUID-FILLED PASSAGE, AND A FLUID IMPELLER DISPOSED WITHIN SAID PASSAGE FOR ROTARY DRIVING CONNECTION WITH THE MASS; COMPENSATING MEANS FOR REGULATING THE DAMPING EFFECT AT A UNIFORM VALUE THROUGH A RANGE OF VALUES OF FLUID VISCOSITY NONUNIFORMLY VARIABLE WITH RESPECT TO FLUID TEMPERATURE, COMPRISING A SHUTTER MOVABLLY MOUNTED TO VALVE SAID PASSAGE, A PLUNGER, SAID SHUTTER AND SAID PLUNGER BEING FORMED WITH CO-ACTING CAM SURFACES IN CONTACT WITH ONE ANOTHER, A FIRST EXPANSIBLE-CHAMBER DEVICE HAVING A RELATIVELY LOW SPRING RATE AND RELATIVELY SMALL EFFECTIVE AREA, AND A SECOND EXPANSIBLE-CHAMBER DEVICE HAVING A RELATIVELY HIGH SPRING RATE AND RELATIVE LARGE EFFECTIVE AREA, SAID EXPANSIBLE-CHAMBER DEVICES BEING ADAPTED TO BE FILLED WITH FLUID AND BEING MUTUALLY DRIVINGLY CONNECTED WITH SAID PLUNGER FOR RECIPROCATION THEREOF BY SAID FIRST DEVICE AT A RELATIVELY RAPID RATE WITH RESPECT TO CHANGES IN TEMPERATURE OF FLUID CONTAINED THEREIN THROUGH A LOWER TEMPERATURE RANGE AND BY SAID SECOND DEVICE AT A RELATIVELY SLOW RATE WITH RESPECT TO CHANGES IN TEMPERATURE OF FLUID CONTAINED THEREIN THROUGH A HIGHER TEMPERATURE RANGE.