Weighing device

Claim 1

A FLUID PRESSURE LOAD CELL COMPRISING A CYLINDER ASSEMBLY DEFINING A CYLINDER HAVING AN UPPER SURFACES AND AN INTERNAL CYLINDER WALL, A PISTON ASSEMBLY INCLUDING A PISTON RECEIVING WITHIN SAID CYLINDER, SAID PISTON HAVING A SUBSTANTIALLY CONTINUOUS CYLINDRICAL SIDEWALL DEFINING AN ANNULAR SPACE WITH SAID INTERNAL CYLINDER WALL, A FLEXIBLE DIAPHRAGM INTERPOSED BETWEEN SAID SURFACE AND SAID PISTON AND DEFINING WITH SAID SURFACE AND SAID PISA FLUID CONDUIT DEFINED IN SAID CYLINDER ASSEMBLY AND PROVIDING COMMUNICATION WITH SAID CAVITY FROM WITHOUT SAID CYLINDER ASSEMBLY, A PLURALIRY OF BEARING ASSEMBLIES COOPERATIVELY CARRIED BY SAID CYLINDER AND SAID PISTON MEMBERS AND CENTERING SAID PISTON WITH RESPECT TO SAID CYLINDER, EACH OF SAID ASSEMBLIES COMPRISING A ROTATIVE BEARING ELEMENT CARRIED WITHIN A AN INDIVIDUAL SOCKET IN ONE OF SAID PISTON AND CYLINDER MEMBERS AND A PLANAR BEARING SURFACE PROVIDING ELEMENT CARRIED BY THE OTHER OF SAID MEMBERS, SAID BEARINGS AND SAID PLANAR SURFACES BEING IN CONTACT, SAID BEARING SURFACES RESIDING WITHIN SAID ANNULAR SPACE.