Sash window with weathertight sealing means

DETAILED DESCRIPTION It is an object of this invention to provide a sash window of the type having horizontally movable sashes, which includes weathertight sealing means capable of preventing the intrusion of wind and rain through dust outlets formed by any cut-away parts of the rails on the sill of an outer frame.
Another object of the invention is to provide a sash window with weathertight sealing means such that, at the time of installation of the window, the sashes can be easily moved up or down relatively to the outer frame to their working positions without the possibility of impairing the weathertightness of the window.
Briefly stated, the invention provides, in a sash window of the type having at least two overlapping sashes independently movable horizontally within an outer frame, the improvement comprising a sill, constituting a part of the outer frame, that is shaped into a series of longitudinally extending steps decreasing in height toward the exterior of the window.
The sill steps include risers having upward extensions to provide at least a pair of rails on which the respective sashes are movably mounted.
Each sash carries a weathertight sealing strip adapted to make sliding engagement with the exterior surface of the respective riser of the sill.
Usually, the rails terminate short of the opposed side posts or jambs of the outer frame to provide dust outlets.
Since the sealing strips carried by the sashes are in sliding engagement with the respective risers under the rails, however, wind or rain cannot enter through the dust outlets when the window is closed.
The above and various other objects, features and advantages of this invention and the manner of attaining them will become more clearly apparent, and the invention itself will best be understood, upon consideration of the following description taken in connection with the accompanying drawings showing a preferred embodiment of the invention.