Patent ID: 7533496
Filing Date: 2009-05-19
Classification: E05B,E05C,Y10S

Abstract:
1. A building window that includes: a generally rectangular frame having an upper rail and opposed side rails, an upper sash and a lower sash independently movably mounted in said frame, a pair of laterally opposed spring detents mounted on said side rails adjacent to said upper rail, and a pair of laterally opposed latches at upper corners of said upper sash at positions to engage said spring detents as said upper sash is moved to a fully raised position, said latches being operable in cooperation with said spring detents to hold said upper sash in said fully raised position and being releasable from said spring detents to permit lowering of said upper sash, wherein each said spring detent has a resilient arm positioned to be engaged by an associated latch as said upper sash is moved toward said fully raised position, and wherein each said resilient arm has a cam portion disposed to be engaged by the associated latch as said upper sash is moved toward said fully raised position resiliently to urge said resilient arm laterally outwardly, and a second portion to cooperate with said latch to hold said upper sash in said fully raised position.