Sash lock

Claim 1

FOR USE WITH A WINDOW HAVING A PANEL MOUNTED IN A FRAME TO SLIDE ENDWISE BACK AND FORTH ALONG A HORIZONTAL PATH BETWEEN AN OPEN POSITION AND A CLOSED POSITION, A LOCK COMPRISING AN ELONGATED BASE MOUNTABLE IN A HORIZONTAL POSITION ON THE FRAME ALONGSIDE SAID PATH, MEANS ON SAID BASE DEFINING A TRACK PARALLELING SAID PATH, SAID BASE HAVING AN UPRIGHT SIDE WALL PARALLELING SAID PATH AND SAID TRACK, A CASING SLIDABLE BACK AND FORTH ALONG SAID TRACK AND SAID WALL AND EXTENDING ABOVE THE LATTER, A BOLT MOVABLY MOUNTED ON SAID CASING AND SLIDABLE RELATIVE THERETO TOWARD THE PANEL AND INTO A BLOCKING POSITION IN THE PLANE OF THE PANEL, A DETENT CARRIED BY SAID CASING AND MOVABLE THEREON TOWARD AND AWAY FROM SAID WALL, THE LATTER BEING FORMED WITH A PLURALITY OF RECESSES OPENING TOWARD SAID DETENT AND SPACED APART ALONG SAID TRACK, A SPRING URGING SAID DETENT OUTWARDLY TOWARD SAID WALL AND INTO AN ALINED NOTCH THEREBY TO LATCH SAID CASING IN A PREDETERMINED POSITION ALONG SAID TRACK AND SAID PATH, AND A MEMBER SECURED TO SAID DETENT ABOVE SAID WALL AND EXTENDING OUTWARDLY OVER SAID WALL TO PROVIDE MEANS FOR MOVING SAID DETENT INWARDLY OUT OF SAID ALINED NOTCH TO RELEASE SAID CASING FOR SLIDING ALONG SAID BASE.