Pressure balanced pivotal joint for piping systems

Claim 1

A PIVOTAL JOINT FOR A PIPING SYSTEM COMPRISING: A TUBULAR CASING HAVING AN OPENING FOR CONNECTION TO A FIRST PIPE OF THE PIPING SYSTEM; SAID TUBULAR CASING HAVING A FIRST APERTURE; A TUBULAR MEMBER EXTENDING THROUGH SAID FIRST APERTURE IN SPACED RELATION TO THE WALLS OF THE CASING, WHEREBY SAID MEMBER HAS AT LEAST LIMITED LATERAL MOVEMENT IN THE APERTURE; SAID TUBULAR MEMBER HAVING INLET MEANS EXTERIOR OF SAID TUBULAR CASING FOR CONNECTION TO A SECOND PIPE OF SAID PIPING SYSTEM AND OUTLET MEANS, SAID TUBULAR MEMBER COMPRISING AN ELBOW PORTION OPEN TO THE INTERIOR OF SAID TUBULAR CASING; GIMBAL MEANS MOUNTED ON THE INTERIOR WALL OF SAID TUBULAR CASING AND ON THE TUBULAR MEMBER FOR PIVOTALLY SUPPORTING SAID TUBULAR MEMBER IS SPACED RELATION FROM THE INTERIOR SURFACE OF SAID TUBULAR CASING, SAID GIMBAL MEANS BEING POSITIONED SUBSTANTIALLY AT AN MIDSECTION OF SAID TUBULAR CASING; A FIRST BELLOWS MEMBER MOUNTED CONCENTRICALLY OVER SAID TUBULAR MEMBER AND DISPOSED WITHIN SAID TUBULAR CASING, SAID FIRST BELLOWS MEMBER HAVING A FIRST END SEALABLY SECURED TO THE EXTERNAL SURFACE OF SAID TUBULAR MEMBER AND A SECOND END SEALABLY SECURED TO THE WALL OF THE TUBULASR CASING AND CIRCUMSCRIBING SAID FIRST APERTURE WHEREBY A SEAL IS FORMED BETWEEN THE TUBULAR MEMBER AND THE TUBULAR CASING ENABLING PIVOTAL MOVEMENT OF SAID TUBULAR MEMBER IN SAID TUBULAR CASING, THE INERIOR OF SAID FIRST BELLOWS BEING OPEN TO ATMOSPHERIC PRESSURE THRU SAID FIRST APERTURE; A SECOND BELLOWS MEMBER OF ESSENTIALLY EQUAL DIAMETER TO SAID FIRST BELLOWS MEMBER AND DISPOSED INTERIORLY OF SAID TUBULAR BELLOWS MEMBER AND DISPOSED INTERIORLY MEMBER, SAID SECOND BELLOWS MEMBER HAVING A FIRST END SECURED TO THE INTERIOR WALL OF SAID TUBULAR CASING OPPOSITE SAID FIRST APERTURE AND A SECOND END SECURED TO THE EXTERIOR SURFACE OF SAID ELBOW PORTION WHEREBY A CHAMBER IS DEFINED BY SAID SECOND BELLOWS, SAID INTERIOR WALL OF SAID TUBULAR CASING AND SAID EXTERIOR SURFACE OF SAID ELBOW PORTION; A SECOND APERTURE IN THE WALL OF SAID TUBULAR CASING COMMUNICATING WITH SAID CHAMBER ENABLING A FREE FLOW OF AIR BETWEEN SAID CHAMBER AND THE ATMOSPHERE WHEREBY A FORCE ACTING ON SAID TUBULAR MEMBER ADJACENT SAID FIRST BELLOWS AND TENDING TO DISPLACE SAID TUBULAR MEMBER IN ONE DIRECTION IS COUNTERBALANCED BY A SECOND EQUAL FORCE ACTING ON SAID ELBOW PORTION THROUGH SAID CHAMBER IN A DIRECTION ESSENTIALLY OPPOSITE FROM SAID FIRST FORCE.