A latch assembly for a closure, particularly a vehicle emergency exit window, comprising a pivotally mounted latch bar engageable with a cam or a pair of cams for providing the force which holds the closure against the structure surrounding the opening closed by the closure. In the preferred embodiment, both the latch bar and a pair of cams are pivotally mounted on the closure so that the cams are engageable with the structure. In other embodiments, the latch bar is pivotally mounted on the closure or on the structure and the cam or cams are either pivotally mounted or mounted in a fixed position on the structure.