Concealed cabinet hinge

Claim 1

IN A CABINET HINGE FOR SECURING A DOOR TO A CABINET FOR SWINGING MOVEMENT ABOUT AN AXIS PARALLEL TO RESPECTIVE EDGES OF THE DOOR AND A FRAME RECEIVING THE DOOR IN A CLOSED POSITION THEREOF AND FORMED BY THE CABINET, SAID HINGE COMPRISING A GUIDE HEAD MOUNTED UPON SAID DOOR PROXIMAL TO SAID EDGE THEREOF, A SUPPORT MOUNTED ON SAID CABINET PROXIMAL TO SAID EDGE THEREOF AND HAVING A SHANK ENGAGING SAID HEAD, SAID HEAD HAVING A SURFACE LYING IN A PLANE PERPENDICULAR TO THE SWINGING AXIS OF THE DOOR AND TO SAID EDGES FORMED WITH A PAIR OF GUIDE GROOVES SPACED FROM SAID EDGES, AND SAID SHANK HAVING A PAIR OF SLIDE BODIES PROJECTING TRANSVERSELY TO SAID SURFACE AND RESPECTIVELY RECEIVED IN SAID GROOVES FOR SLIDING DISPLACEMENT THEREIN, THE IMPROVEMENT WHEREIN (A) SAID SURFACE IS FORMED WITH A FURTHER GUIDE GROOVE OPENING AT ONE END THEREOF IN THE DIRECTION OF SAID SHANK AND SPACED FROM SAID EDGES FURTHER THAN THE FIRST-MENTIONED GROOVES; AND (B) A FURTHER SLIDE BODY PROJECTING FROM SAID SHANK TRANSVERSELY OF SAID SURFACE AND RECEIVED IN SAID FURTHER GROOVE FOR GUIDING SAID DOOR UPON DOORCLOSING MOVEMENT THEREOF AT LEAST DURING THE PORTION OF SAID MOVEMENT AT WHICH SAID DOOR ENTERS SAID FRAME BUT WITHDRAWN FROM SAID FURTHER GROOVE IN AN OPEN POSITION OF THE DOOR.