Spring-pressed shutoff for injection nozzle

Claim 1

AN INJECTION NOZZLE COMPRISING A HOLLOW ELONGATED NOZZLE BODY HAVING AN OPEN REAR INLET END AND A FORWARD DISCHARGE END CLOSED EXCEPT FOR A SMALL DISCHARGE OPENING, A SHUTOFF PIN SLIDABLY MOUNTED IN SAID BODY FOR AXIAL MOVEMENT AND HAVING A LARGE SECTION SUBSTANTIALLY SEALINGLY ENGAGING THE WALLS OF SAID BODY AT A ZONE SPACED REARWARDLY FROM SAID DISCHARGE OPENING, SAID PIN EXTENDING AWAY FROM SAID DISCHARGE END AND BEYOND SAID OPEN END OF SAID BODY AND THERE BEING CYLINDRICAL AND SPACED RADIALLY INWARDLY AND CONCENTRIC WITH A CYLINDRICAL INNER WALL SURFACE PORTION OF SAID BODY LEAVING AN ANNULAR SPACE THERE, AN END MEMBER SECURED TO SAID BODY AT SAID INLET END AND ENTERING SAID ANNULAR SPACE AND SEALINGLY ENGAGING SAID CYLINDRICAL PIN PORTION AND SAID CYLINDRICAL WALL SURFACE PORTION OF SAID BODY, SAID PIN BEING AXIALLY MOVABLE RELATIVE TO SAID END MEMBER, MEANS NORMALLY URGING SAID PIN IN POSITION CLOSING SAID DISCHARGE OPENING, THERE BEING A STOP PORTION ON SAID END MEMBER DISPOSED REARWARDLY OF SAID URGING MEANS, A STOP ON SAID PIN DISPOSED REARWARDLY OF SAID URGING MEANS AND SPACED FORWARDLY FROM SAID STOP PORTION WHEN SAID PIN IS IN SAID CLOSING POSITION, SAID END MEMBER HAVING AN AXIALLY EXTENDING RING-LIKE PORTION DISPOSED FORWARDLY OF SAID STOP PORTION AND EXTENDING FORWARDLY OF SAID STOP ON SAID PIN IN GENERALLY ENCOMPASSING ENGAGED RELATION WITH SAID PIN FOR SUPPORTING AND GUIDING SAID PIN FOR AXIAL MOVEMENT THEREOF WITH RESPECT TO SAID BODY AND SAID END MEMBER, THERE BEING A CENTRAL MATERIAL PASSAGEWAY THROUGH SAID END MEMBER AND THROUGH SAID PIN FROM END TO END, SAID PASSAGEWAY TERMINATING IN A DISCHARGE POCKET AT SAID DISCHARGE END, SAID POCKET BEING DISPOSED FORWARDLY OF SAID ZONE AND HAVING A DEFINING SURFACE WHICH TAPERS SMOOTHLY TOWARD SAID DISCHARGE OPENING AND MERGES WITH THE LATTER, THE FRONT END OF SAID PIN COMPRISING A SMOOTHLY FORWARDLY TAPERING NOSE PORTION ADAPTED FOR CLOSING SAID DISCHARGE OPENING WHEN SAID PIN IS IN SAID CLOSING POSITION, SAID NOSE PORTION BEING DISPOSED IN RADIALLY INWARDLY SPACED RELATION TO SAID DEFINING SURFACE OF SAID POCKET EXCEPT AT THE DISTAL END OF SAID NOSE PORTION WHEN SAID PIN IS IN SAID CLOSING POSITION, SAID POCKET COMMUNICATING WITH SAID DISCHARGE OPENING WHEN SAID PIN IS IN OPEN POSITION, AND THE CROSS SECTIONAL AREA OF SAID POCKET BEING GREATER THAN THE CROSS SECTIONAL AREA OF SAID PIN EXPOSED TO PRESSURE FROM SAID INLET END DURING INJECTION CREATING A DIFFERENTIAL PRESSURE ADAPTED TO OVERCOME SAID URGING MEANS AND TENDING TOWARD PIN-OPENING MOVEMENT, WHEREBY SAID PIN NORMALLY CLOSES SAID DISCHARGE OPENING BUT, UNDER INJECTION PRESSURE, SAID DIFFERENTIAL PRESSURE OVERCOMES SAID URGING MEANS AND MOVES SAID PIN IN OPENING DIRECTION UNTIL SAID STOP ON SAID PIN ENGAGES SAID STOP PORTION ON SAID END MEMBER.