Oven door for domestic range

Claim 1

AN OVEN DOOR HAVING A SUBSTANTIALLY CENTRALLY LOCATED OPENING THEREIN, SAID OPENING BEING DEFINED BY A SUBSTANTIALLY RECTANGULAR SHAPED COLLAR, SAID COLLAR HAVING ADJACENT THE OVEN INSIDE END THEREOF AN INWARDLY EXTENDING WINDOW UNIT SEATING FLANGE, A PAIR OF LOCKING KEY RECEIVING RECESSES IN SAID COLLOR, SAID RECESSES HAVING SLOPING SURFACES AT THE FRONT EDGES THEREOF, A WINDOW UNIT FOR SAID OVEN DOOR, SAID WINDOW UNIT HAVING A PAIR OF LOCKING KEYS WITH MANUALLY OPERABLE TURNING MEANS THEREFOR AND A PAIR OF CHANNELIZED GLASS PANEL RETAINING ELEMENTS RELEASABLY JOINED TOGETHER AT THEIR ENDS BY A CONNECTOR WITH SAID CONNECTOR ALSO COMPRISING THE LOCKING KEY HOUSING, SAID KEYS COMPRISING ROTATABLE ELEMENTS WITH RADIALLY EXTENDING RECESS ENGAGING PARTS AND MEANS INCLUDING THE MANUAL TURNING OF SAID KEYS TO ENGAGE THE RADIALLY ENTENDING PARTS OF SAID KEYS WITH THE SLOPING SURFACES OF SAID RECESSES TO DRAW SAID WINDOW UNIT INTO SEATING RELATIONSHIP WITH SAID SEATING FLANGE.