Door control mechanism

Claim 1

IN A LOCKING MECHANISM FOR DOORS AND THE LIKE, A PIVOTALLY SUPPORTED MEMBER, AN OVERCENTER SPRING MEANS BIASING SAID MEMBER IN ONE DIRECTION OR THE OTHER END ITS PIVOT, A LOCK BOLT RECIPROCABLE BETWEEN A FIRST POSITION AND A SECOND POSITION, ROD MEANS OPERATIVELY CONNECTED TO SAID MEMBER ECCENTRICALLY OF THE AXIS ABOUT WHICH SAID MEMBER IS PIVOTALLY SUPPORTED AND TO SAID LOCK BOLT FOR CONTROLLING MOVEMENT OF SAID LOCK BOLT FROM SAID FIRST POSITION TO SAID SECOND POSITION UPON ANGULAR MOVEMENT OF SAID MEMBER ABOUT ITS PIVOTAL SUPPORT FROM A FIRST ANGULAR POSITION TO A SECOND ANGULAR POSITION, A MANUAL MEANS FOR OSCILLATING SAID MEMBER ABOUT ITS PIVOTAL AXIS BETWEEN SAID ONE ANGULAR POSITION AND SAID SECOND ANGULAR POSITION AND BETWEEN SAID SECOND ANGULAR POSITION AND A THIRD ANGULAR POSITION, A SLIDE BOLT RECIPROCABLE BETWEEN A PROJECTED POSITION AND A RETRACTED POSITION, SPRING MEANS BIASING SAID SLIDE BOLT TO ITS SAID PROJECTED POSITION, AND MEANS OPERATIVELY CONNECTING SAID MEMBER AND SAID SLIDE BOLT FOR MOVING SAID SLIDE BOLT IN THE DIRECTION OF ITS SAID RETRACTED POSITION ONLY UPON ANGULAR MOVEMENT OF SAID MEMBER FROM SAID SECOND ANGULAR POSITION TO SAID THIRD ANGULAR POSITION.