Door lock hardware

Claim 1

A HINGED DOOR OF THE CHARACTER DESCRIBED HAVING A FLUSH TYPE MOVABLE DOOR-PULLING PLATE-LIKE MEMBER HAVING A MANUALLY ENGAGEABLE DOOR-PULLING RECESS AT THE FRONT FACE THEREOF, A YIELDABLY RETRACTIVE LATCH-BOLT CARRIED BY SAID DOOR AND OPERATIVELY CONNECTED TO SAID DOOR PULLING MEMBER, SAID LATCH-BOLT NORMALLY PROJECTING EDGEWISE FROM SAID DOOR TO ENGAGE MEANS EXTERNAL OF THE DOOR TO HOLD SAME LOCKED AGAINST PULLING IN THE DIRECTION NORMAL TO THE PLANE OF THE PLATE-LIKE MEMBER IN CLOSED POSITION OF THE DOOR, SAID PULLING RECESS EXTENDING REARWARDLY FROM THE FRONT FACE OF SAID DOOR-PULLING MEMBER AND HAVING AN INCLINED SIDE SURFACE BETWEEN SAID FRONT AND REAR SURFACES OF SAID RECESS, SAID INCLINED SIDE SURFACES SLOPING REARWARDLY AND AWAY FROM THE HINGED EDGE OF THE DOOR AND BEING OF SUCH DEPTHS AS TO PERMIT ONLY FINGERTIP ENGAGEMENT AND OF SUCH INCLINATION WITH RESPECT TO FRICTIONAL PURCHASE OF OPERATING FINGERTIPS AS TO REQUIRE SIDEWISE PRESSURE TO ATTAIN EFFECTIVE PULLING PURCHASE UPON THE CLOSED AND BOLTED DOOR, WHEREBY, UPON MANUAL CONTACT AND PRESSURE SUFFICIENT FOR PULLING PURCHASE THE SAID LATCH-BOLT IS FIRST INVOLUNTARILY WITHDRAWN.