Patent ID: 8074410
Filing Date: 2011-12-13
Classification: E06B

Abstract:
1. An interlocking frame and sash system for a window, comprising: a window sill; a rail extending from and integral with said window sill, said rail including: wherein said head portion is wider than said body portion and is at least partially rounded in shape; and a window sash defining a slot with facing vertical surfaces, said slot configured to receive said head portion, wherein said head portion of said rail is configured for direct engagement with at least one of said facing vertical surfaces of said slot when said window is in a closed position, wherein said at least one of said facing vertical surfaces includes a groove, wherein said rail is configured to allow for vertical movement of said window sash relative to said window sill when said window is in a closed position and further wherein said rail is configured to interlock said window sill and said window sash when said window is in a closed position, thereby preventing horizontal movement of said window sash, wherein said head portion includes a protuberance on only a single side of said head portion for promoting engagement of said head portion with said slot when said window is in a closed position.