Window sash latch

Claim 1

IN A MEANS FOR NORMALLY PREVENTING AN INCREASED RELATIVE OPENING MOVEMENT OF A PAIR OF MUTUALLY PARALLEL AND LAPPED OUTER UPPER AND INNER LOWER SASH IN A FRAMED WINDOW OPENING FOR THEIR RELATIVE ADJUSTMENT IN THE OPENING BETWEEN LIMITED OPEN AND CLOSED POSITIONS WITH RESPECT TO THE TOP AND BOTTOM OF THE OPENING, MEANS ON AN UPRIGHT MEMBER OF THE OUTER SASH PROVIDING AN UPRIGHT LINE OF INWARDLY-OPENING BOLT-RECEIVING RECESSES, A RIGID AND STRAIGHT ELONGATED BOLT MEMBER CARRIES ON AND TRANSVERSELY ACROSS THE INNER SASH, MEANS HINGEDLY AND INTERMEDIATELY MOUNTING THE BOLT MEMBER NEARER THE INNER END THEREOF ON THE LOWER SASH FOR ITS LIMITED SWINGING IN AN UPRIGHT PLANE TRANSVERSE TO THAT OF THE WINDOW OPENING AND INCLUDING SAID LINE OF RECESSES AND ABOUT A FIXED INTERMEDIATE HORIZONTAL AXIS THEREFOR WITH RESPECT TO THE MOUNTING SASH TO PROVIDE OPPOSITELY DIRECTED ARM PORTIONS THEREOF WITH THE OUTWARDLY-DIRECTED BOLT ARM TERMINATING IN A WORKING END PORTION SELECTIVELY ENGAGEABLE IN A SAID RECESS TO NORMALLY HOLD THE SASH OF THE PAIR AGAINST RELATIVE OPENING MOVEMENTS WHILE THE UPPER EDGE OF THE WORKING END OF THE BOLT IS SLIGHTLY DOWNWARDLY INCLINED AND IN ENGAGEMENT WITH A PART OF SAID MOUNTING MEANS WHILE A RATCHETING RELATIVE CLOSING MOVEMENT OF THE SASH IS PERMITTED, SAID BOLT BEING SWINGABLE UPWARDLY ABOUT SAID AXIS FOR A DISPOSAL OF ITS RECESS-ENGAGING EXTREMITY INWARDLY OF THE OPPOSED RECESS SIDE BAR OF THE OUTER SASH AND ITS OTHER SAID ARM DOWNWARDLY INCLINED AND IN ENGAGEMENT WITH A SECOND PART OF SAID MOUNTING MEANS TO THEN DISENGAGE THE SASH FOR THEIR FREE RELATIVE ADJUSTMENT IN THE WINDOW OPENING AND THE OTHER SAID ARM BEING CONSTANTLY EXPOSED INWARDLY OF SAID HINGING MEANS FOR ITS DIRECT MANUAL ENGAGEMENT FROM ABOVE FOR EFFECTING SAID UPWARD SWINGING OF THE BOLT THROUGH A RELATIVELY SMALL ACUTE ANGLE TO PROVIDE FREE ADJUSTABILITY OF THE SASH.