Pressure system charging tool and method

Claim 1

AN EVACUATING AND CHARGING TOOL FOR USE WITH A REFRIGERATION SYSTEM HAVING A THREADED PORT PROVIDED WITH A REMOVABLE THREADED SCHRADER VALVE CORE COMPRISING; A BODY MEMBER HAVING A SEALED ELONGATED CHAMBER OPENING AT ONE END FOR SEALED COMMUNICATION WITH SAID THREADED PORT, SAID BODY MEMBER HAVING A LATERALLY EXTENDING PORT FOR COMMUNICATION WITH EVACUATING AND CHARGING LINES, AND AN OPERATING SHAFT EXTENDING THROUGH AND SUPPORTED BY THE CHAMBER WALL OPPOSITE SAID OPENING, SAID OPERATING SHAFT HAVING A SCHRADER VALVE CORE GRAPPLING MEANS LOCATED WITHIN SAID CHAMBER AT ITS INNER END, A CONTROL MEANS LOCATED OUTSIDE OF SAID CHAMBER, SAID GRAPPLING MEANS ROTATABLY AND AXIALLY SHIFTABLE WITHIN SAID CHAMBER IN RESPONSE TO SAID CONTROL MEANS AND HAVING A BIFURCATED END RECEIVED OVER SAID SCHRADER VALVE CORE TO FRICTIONALLY RETAIN SAID CORE TO EFFECT UNTHREADING OF SAID VALVE CORE ON ROTATION, AND WITHDRAWAL OF SAID VALVE CORE IN RESPONSE TO AXIAL MOTION OF SAID CONTROL MEANS TO A POSITION WITHIN SAID SEALED CHAMBER BETWEEN SAID LATERALLY EXTENDING PORT AND SAID CHAMBER WALL OPPOSITE SAID OPENING WHERE IT DOES NOT RESTRICT THE FLOW PASSAGE BETWEEN SAID PORTS DURING EVACUATING AND CHARGING OF SAID COMPRESSOR, SAID GRAPPLING MEANS ALSO SHIFTABLE WITHIN SAID CHAMBER IN RESPONSE TO SAID OPERATING MEANS TO RETHREAD AND TIGHTEN SAID VALVE CORE WITHIN SAID THREADED PORT AFTER THE EVACUATING AND CHARGING OPERATIONS.