Self locking stay mechanisms

Claim 1

A LOCKING STAY COMPRISING A FIRST MEMBER AND A SECOND MEMBER CONNECTED TOGETHER BY CONNECTING MEANS WHICH PERMITS, BETWEEN THE MEMBERS, A DEFINED RELATIVE MOVEMENT IN A FORWARD AND A REVERSE DIRECTION, EACH MEMBER BEING FORMED WITH A SURFACE OVERLYING A SURFACE OF THE OTHE MEMBER AND SLIDABLE THEREOVER DURING SAID RELATIVE MOVEMENT OF THE MEMBERS, AND EACH SURFACE BEING FORMED WITH A SLOT PARTIALLY OVERLYING AND IN REGISTER WITH THE SLOT OF THE OTHER SURFACE, THERE BEING PROVIDED, YIELDINGLY CONSTRAINED TO MAINTAIN ITS INSTANTANEOUS POSITION BUT OTHERWISE FLOATING, A DOUBLE-ENDED PAWL HAVING ITS THICKNESS ACCOMMODATED PARTLY IN ONE SLOT AND PARTLY IN THE OTHE SLOT, THE SLOTS BEING FORMED WITH BOUNDING WALLS SO SHAPED THAT ON SUCCESSIVE RELATIVE MOVEMENTS OF THE MEMBERS ALTERNATELY IN THE FORWARD DIRECTION AND IN THE REVERSE DIRECTION THE PAWL IS CAMMED BY THE WALLS SUCCESSIVELY INTO PROGRESSIVELY ROTATED POSITIONS, THE PAWL BEING ENGAGED BY THE WALLS OF THE TWO SLOTS, IN A FIRST AND A THIRD OF SAID ROTATED POSITIONS, TO PREVENT FURTHER RELATIVE MOVEMENT OF THE MEMBERS IN THE FORWARD DIRECTION AND, IN THE SECOND OF SAID ROTATED POSITIONS, TO PREVENT FURTHER RELATIVE MOVEMENT IN THE REVERSE DIRECTION, AND THE PAWL, IN THE FOURTH OF ITS SAID ROTATED POSITIONS, BEING GENERALLY ALIGNED WITH THE PERMITTED DIRECTION OF RELATIVE MOVEMENT AND WITH AN EXTENSION IN THAT DIRECTION OF AT LEAST ONE OF THE SLOTS, SAID EXTENSION PERMITTING MOVEMENT OF THE EXTENDED SLOT AND THE ASSOCIATED MEMBER RELATIVE TO THE ALIGNED PAWL AND THE OTHER MEMBER, IN THE REVERSE DIRECTION TO A RELATIVE POSITION OF THE MEMBERS WHICH IS SUBSTANTIALLY DISPLACED, IN THE REVERSE DIRECTION OF RELATIVE MOVEMENT, FROM THEIR RELATIVE POSITION AS LIMITED, IN THAT DIRECTION, BY THE PAWL IN ITS SAID SECOND ROTATED POSITION.