Sash lock

Claim 1

A LOCK FOR USE ON WINDOWS HAVING A PANEL SLIDABLE IN A FRAME BETWEEN AN OPEN AND A CLOSED POSITION, SAID LOCK COMPRISING A HOUSING ADAPTED TO BE MOUNTED ON SAID FRAME ADJACENT ONE END OF SAID PANEL WHEN THE PANEL IS IN SAID CLOSED POSITION, A BOLT MOVABLE BACK AND FORTH IN SAID HOUSING TOWARD AND AWAY FROM SAID PANEL, SAID BOLT HAVING PROJECTIONS FORMING A HOOK ADJACENT ONE END AND A FINGER ADJACENT THE OTHER END, SAID HOOK AND SAID FINGER PROJECTING THROUGH SAID HOUSING AND TOWARD SAID PANEL, A SLIDE ACCESSIBLE FROM THE EXTERIOR OF SAID HOUSING AND MANUALLY MOVABLE BACK AND FORTH RELATIVE TO SAID BOLT BETWEEN A LOCKED POSITION AND AN UNLOCKED POSITION, CAM SURFACES FORMED ON SAID SLIDE ADJACENT SAID BOLT AND COACTING WITH OPPOSING SURFACES ON THE BOLT WHEN THE SLIDE IS MOVED TOWARD SAID LOCKED POSITION TO MOVE THE BOLT TOWARD SAID WINDOW AND SIMULTANEOUSLY TO TURN THE BOLT AND ADVANCE THE HOOK AHEAD OF THE FINGER, THEREBY TO PRESS SAID FINGER AGAINST SAID PANEL AND URGE THE LATTER AWAY FROM SAID LOCK AND INTO TIGHT CONTACT WITH A STATIONARY MEMBER OF SAID FRAME, AND TO ROCK SAID HOOK INTO A BLOCKING POSITION PAST ONE EDGE OF SAID PANEL WHEN THE LATTER IS IN SAID CLOSED POSITION.