Latches and locks

Claim 1

LOCK MEANS FOR USE WITH A DOOR WHICH IS SWINGINGLY MOVABLE RELATIVE TO A DOOR JAMB HAVING A STOP MEMBER, COMPRISING A LATCH HOUSING DISPOSED WITHIN THE DOOR AND HAVING A BOLT ACCOMMODATION OPENING FLUSH WITH AN EDGE OF THE DOOR; A LATCH BOLT COMPOSED AT LEAST PARTLY OF MAGNETIC MATERIAL HAVING ONE END PORTION THEREOF PIVOTALLY SUPPORTED BY SAID HOUSING ADJACENT SAID BOLT ACCOMMODATION OPENING FOR SWINGING MOVEMENT OF AT LEAST PART OF THE OTHER END PORTION OF SAID LATCH BOLT INTO AND OUT OF SAID HOUSING THROUGH SAID BOLT ACCOMMODATION OPENING; A PERMANENTLY MAGNETIZED STRIKE MEMBER EMBEDDED IN THE DOOR JAMB AND REGISTERING WITH THE LATCH BOLT WHEN THE DOOR IS FULLY CLOSED, SAID STRIKE MEMBER HAVING A CONCAVE OUTER SIDE THE CURVATURE OF WHICH RECEDES SHARPLY ADJACENT ITS FORWARD EDGE FORMING A CONCAVE SHOULDER POSITIONED FOR ENGAGEMENT BY THE SWINGINGLY MOVABLE FORWARD END OF THE LATCH BOLT, THE WEDGING PRESSURE EXERTED BY SAID LATCH BOLT WHEN IT IS URGED AGAINST SAID SHOULDER BY THE MAGNETIC PULL OF SAID STRIKE MEMBER HOLDING THE DOOR IN TIGHTLY CLOSED RATTLE FREE ENGAGEMENT WITH THE STOP MEMBER OF SAID DOOR JAMB; LATCH BOLT HOLDING MEANS CAPABLE OF YIELDINGLY HOLDING SAID LATCH BOLT IN A RETRACTED POSITION, THE MAGNETIC PULL OF SAID STRIKE MEMBER BEING CAPABLE OF OVERCOMING THE FORCE OF SAID LATCH BOLT HOLDING MEANS AND HOLDING SAID LATCH BOLT IN ENGAGEMENT WITH SAID STRIKE MEMBER WHEN SAID STRIKE MEMBER AND SAID LATCH BOLT ARE ALIGNED WITH EACH OTHER; RELEASABLE BOLT LOCKING DEVICES CAPABLE OF LOCKING SAID LATCH BOLT IN ENGAGEMENT WITH SAID STRIKE MEMBER; AND LATCH BOLT RETRACTING MEANS CONNECTED WITH SAID LATCH BOLT AND LOCKING DEVICES OPERABLE IN FIRST UNLOCKING SAID LOCKING DEVICES AND THEN RETRACTING SAID LATCH BOLT.