Fitting for tubes

Claim 1

A FITTING FOR CONNECTION TO A TUBE COMPRISING IN COMBINATION, A BODY MEMBER, A SLEEVE MEMBER AND A NUT MEMBER HAVING ALIGNED BORES FOR RECEIVING A TUBE THEREIN, THE BORE OF THE BODY MEMBER HAVING AN INWARDLY TAPERED WALL FOR ENGAGING A FIRST END PORTION OF THE SLEEVE MEMBER AND THE BORE OF THE NUT MEMBER HAVING A WALL SURROUNDING AN OPPOSITE END PORTION OF THE SLEEVE MEMBER, SAID BODY MEMBER AND NUT MEMBER BEING COMPLEMENTARILY THREADED TO PERMIT THE NUT MEMBER TO BE THREADABLY TURNED DOWN RELATIVE TO THE BODY MEMBER AND A COMPRESS THE SLEEVE MEMBER THEREBETWEEN IN AN AXIAL DIRECTION, SAID SLEEVE MEMBER HAVING AN ANNULAR FLANGE PORTION EXTENDING THEREAROUND SUBSTANTIALLY EQUIDISTANTLY FROM THE OPPOSITE ENDS OF THE SLEEVE MEMBER AND CYLINDRICAL PORTIONS EXTENDING IN OPPOSITE AXIAL DIRECTIONS FROM SAID FLANGE PORTION, THE OPPOSITE ENDS OF THE SLEEVE MEMBER HAVING CUTTING EDGE PORTIONS, RESPECTIVELY, FOR BITINGLY ENGAGING THE TUBE UPON COMPRESSION UPON THE TUBE, SAID FLANGE PORTION HAVING AXIALLY SPACED SIDES INCLINED TOWARD EACH OTHER FROM SAID CYLINDRICAL PORTIONS AT LOCATIONS AXIALLY SPACED FROM SAID OPPOSITE ENDS, RESPECTIVELY, SAID FLANGE PORTION HAVING AN ANNULAR GROOVE EXTENDING THEREAROUND INTERMEDIATE SAID SIDES AND EXTENDING FROM THE CIRCUMFERENTIAL PERIPHERY OF THE FLANGE PORTION RADIALLY INWARD THEREOF, THE DEPTH OF SAID GROOVE BEING SUCH THAT THE THICKNESS OF THE WALL OF THE SLEEVE MEMBER IN THE PLANE OF SAID GROOVE DISPOSED NORMAL TO THE AXIS OF THE SLEEVE MEMBER IN THAT THE THICKNESS OF THE WALL OF THE SLEEVE MEMBER IN TRANSVERSE PLANES DISPOSED NORMAL TO SAID AXIS THROUGH SAID CYLINDRICAL PORTIONS, RESPECTIVELY, AT LOCATIONS SUBSTANTIALLY EQUIDISTANT OF SAID FLANGE PORTION AND OF THE OPPOSITE ENDS OF SAID SLEEVE MEMBER TO WEAKEN THE SLEEVE MEMBER AT THE LOCATION OF SAID GROOVE, SAID BODY MEMBER AND SAID NUT MEMBER HAVING SPACED OPPOSING SURFACES INCLINED TOWARD EACH OTHER IN GENERAL CON-