Door lock

Claim 1

IN A DOOR LOCK FOR USE WITH DOOR AND FRAME MEMBERS RELATIVELY SWINGABLE IN OPPOSITE LATCHING AND UNLATCHING DIRECTIONS, A FORKED LATCHING MEMBER MOUNTED TO PIVOT ON ONE OF SAID MMEBERS INTO AND OUT OF POSITION FOR STRADDLING AND LATCHING ENGAGEMENT WITH A KEEPER MEMBER ON THE OTHER OF SAID MEMBERS, SAID LATCHING MEMBER HAVING HOLDING MEANS FIXED RELATIVE THERETO TO PIVOT THEREWITH, A DETENT UNIT RELESABLY ENGAGEABLE WITH SAID HOLDING MEANS TO POSITIVELY BUT RELEASABLY HOLD SAID LATCHING MEMBER IN LATCHING ENGAGEMENT WITH THE KEEPER MEMBER, AND SPRING MEANS URGING SAID LATCHING MEMBER AND HOLDING MEANS OUT OF SAID POSITION OF THE LATCHING MEMBER WHEN SAID DETENT MEMBER IS RELEASED FROM SAID HOLDING MEANS, SAID FORKED LATCHING MEMBER HAVING AN ACTUATING ARM, A HOLDING ARM AND A ROOT PORTION MIDWAY BETWEEN SAID ARMS, SAID ROOT PORTION BEING ENGAGED AND RESTRAINED BY SAID KEEPER MEMBER IN ONE VERTICAL DIRECTION WHEN SAID LATCHING MEMBER IS IN SAID POSITION FOR SAID STRADDLING AND LATCHING ENGAGEMENT, SAID HOLDING ARM BEING PROVIDED WITH AN INCLINED HOLDING SURFACE THEN ENGAGING SAID KEEPER MEMBER FOR A SUBSTANTIAL DISTANCE ABOUT THE LATTER FROM SAID ROOT PORTION WITH A SUBSTANTIAL COMPONENT OF FORCE FROM THE OPPOSITE VERTICAL DIRECTION, SAID SURFACE BEING AT AN INCLINATION SUBSTANTIALLY ACUTE AND CONVERGENT WITH THE DIRECTION OF HORIZONTAL RELATIVE SWING OF THE DOOR AND FRAME MEMBERS IN THE LATCHING DIRECTION, SAID COMPONENT OF FORCE BEING NORMAL TO THE DIRECTION OF SWING FOR THE VERTICAL RESTRAIN OF THE DOOR MEMBER IN SAID OIPPOSITE DIRECTION BY SAID KEEPER MEMBER.