Secur a door police lock

In combination with an inwardly or outwardly opening door mounted in the opening of a room or a building having a frame forming said opening in which said door is mounted, said frame including door jamb means having a portion thereof extending inwardly so that said door when shut is flush against one surface of said portion, door locking means comprising a lever arm pivotally mounted at its center on the inner surface of said door, means for supporting for slidable movement in a straight line a first bolt adjacent one edge of said door, means for supporting for slidable movement in a straight line a second bolt adjacent an opposite edge of said door, both of the aforesaid straight lines being aligned with each other so that the aforesaid bolts slide in opposite directions along the same straight line without any rotation with respect to said straight line, connecting means in response to the rotation of said lever arm in one direction to cause said bolts to slide away from each other, and in response to the rotation of said lever arm in the opposite direction to cause said bolts to move toward each other, lock means on the outside of said door passing through said door and connected to said lever arm to permit the use of a key to rotate said lever arm, knob means on the inside of said door connected to said lever arm through pin and cylinder means to permit the rotation of said lever arm by said knob means without causing movement within said lock means to permit rotation of said lever arm to open said door when said lock is in the locked position without disengaging said knob means from said lock, and retainer means mounted on said frame to lock said door when said lever arm is rotated in said one direction causing said bolts to engage said retainer means and to unlock said door when said lever arm is rotated in the opposite direction causing said bolts to become disengaged from said retainer means, said connecting means comprising a first floating link connected pivotally at one end to said first bolt and pivotally at the other end to one end of said lever arm and a second floating link connected pivotally at one end to said second bolt and pivotally at the other end to the other end of said lever arm, and spring means to bias said first and second floating links in both the locking and unlocking positions of said bolts, said spring means comprising a spring for each of said floating links, one end of each spring connected to a floating link, and the other end of each spring connected to said door.