Inclined-piston dead-weight pressure gauge

Claim 1

A PRECISION GAUGE FOR MEASURING THE PRESSURE OF A SOURCE THEREOF, COMPRISING A FIRST TUBULAR HOUSING FORMED AS A PLURALITY OF CONTIGUOUS CHAMBERS INCLUDING A CENTRAL CHAMBER HAVING OPERATIVELY RELATED THEREIN PISTON AND CYLINDER STRUCTURES, MEANS FOR CONNECTING SAID CYLINDER STRUCTURE TO SAID SOURCE, BEARING DEVICES SUPPORTING THE SAID CYLINDER STRUCTURE FOR ROTATION ABOUT THE LONGITUDINAL AXIS OF THE SAID FIRST HOUSING, SAID PISTON STRUCTURE BEING FREELY MOVABLE IN SAID CYLINDER STRUCTURE FOR LINEAR AND ROTATIVE DISPLACEMENTS THEREIN ON VACUUM PUMP LUBRICATION COATING THE MUTUALLY CONTACTING SURFACES OF THE PISTON AND CYLINDER STRUCTURES, A SECOND TUBULAR HOUSING INTEGRALLY JOINED WITH THE SAID FIRST HOUSING, THE RESPECTIVE LONGITUDINAL AXES OF THE SAID HOUSINGS BEING POSITIONED THEREBY AT RIGHT ANGLES TO EACH OTHER, SPACED SUPPORT ELEMENTS COMPRISING BEARING SLEEVES IN WHICH THE SAID SECOND HOUSING IS MAINTAINED FOR ROTATION ABOUT ITS LONGITUDINAL AXIS, DRIVEN SHAFT MEANS SUPPORTED ON BEARING DEVICES IN SAID SECOND HOUSING FOR ROTATION ABOUT THE SAID AXIS THEREOF, AND HAVING CONNECTED THERETO MEANS IMPARTING ROTATION TO SAID CYLINDER STRUCTURE IN SAID FIRST HOUSING, DRIVE MEANS OPERATIVELY ASSOCIATED WITH SAID SUPPORT ELEMENTS AND SAID SECOND HOUSING TO ANGULARLY POSITION THE LATTER ABOUT ITS SAID AXIS, AND THE SAID AXIS OF THE FIRST HOUSING IN A VERTICAL PLANE, A PLATE MOUNTED ON AN END PORTION OF THE SAID SECOND HOUSING TO BE ROTATABLE THEREWITH ABOUT ITS SAID AXIS, AND HAVING GRADUATED ANGULAR INDICIA ON A FACE THEREOF, AN OPTICAL COINCIDENCE READING SYSTEM ALIGNED WITH THE SAID PLATE FACE, AND OPERABLE TO READ THEREFROM THE ANGULAR DISPLACEMENT OF THE SAID AXIS OF THE FIRST HOUSING IN A VERTICAL PLANE.