Latch for pivotal sash window

Claim 1

In a pivotal-type window sash adapted for installation in the master jamb frame of a double-hung window assembly having opposed, vertically extending guide rails to enable vertical reciprocal sliding movement of the sash in the master jamb frame while cooperatively engaged with the guide rails, the sash having a header, a base and a pair of stiles cooperatively connected together at adjacent extremities thereof to form a miter-jointed, rectangular sash frame; a latch mechanism adapted to be operatively installed internally of the sash frame to said header, albeit manually operable from externally of the sash frame for releasing the latch mechanism to permit pivotal movement of the window sash, said latch mechanism comprising: A. a housing having a planar upper wall, a depending boss formation at opposite ends of said wall having a bore therein opening to the upper surface of said planar wall, and opposing said wall formations depending from said planar wall along opposite longitudinal edges of the planar wall, a pair of said side wall formations having flange formations at the extremities thereof; B. a latching bolt slidably installed in said housing between said side wall formation supported on said flange formations below said planar wall, said bolt having an end segment protruding beyond an end of said housing for engaging in a guide rail for releasably locking the said frame against pivotal movement relative to the master jamb frame, the bolt being installed under spring tension normally urging said end segment into locking position relative to a guide rail; C. a control member having depending post means connected through said planar wall to said latch bolt for manually sliding the bolt against said spring tension for retracting said end segment from a guide rail; D. said housing adapted to be secured to an interior surface of said header by fastener means extending through the header into said bores of the boss formations and said end segment of the latch bolt extending through a passageway in a stile into operative engagement with a guide rail; E. said control member adapted to be connected to the latch bolt externally of the header by means of said post means extending through the header, the control member being slidable on the header for releasing the latch bolt.