| 摘要 |
A sliding window having two or more removable sashes each having a sash frame supporting a sealed doubled glazing unit, the sash frame having a sash head and a sash sill made from a thermally insulating plastic material extrusion presenting a hollow structure with two spaced apart guiding legs adapted to engage into and slide along corresponding head track and sill track members. The head track and sill track members provide a pair of guide grooves for the slidable sash and a pair of guide grooves of the same spacing for the fixed sash. A runner or a plurality of runners of appropriate anti-friction material may be disposed between the guiding legs of the sash sill and they bear upon a horizontal bearing surface provided on the sill track between the guide grooves of the corresponding pair thereof. The runners prevent contact between the guiding legs of the sash sill and the bottom of the guide grooves of the sill track. This anti-friction system is particularly useful in the case of relatively heavy slidable sashes. In addition, a waterproofing cover is provided over the uncovered portion of the outer pair of guide grooves of the sill track, providing a main sloping surface extending outwardly and downwardly for draining excess water and thus better waterproofing this critical region of the sliding window.
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