A window includes at least one multiple pane unit ( 1, 2 ) mounted in an opening for sliding movement between an open position and a closed position. The multiple pane unit ( 1, 2 ) includes at least two panes ( 34, 38 ) in spaced disposition, and has a seal ( 30 ) disposed there between to form a sealed chamber between the two panes. At least one of the panes ( 38 ) extends beyond the seal ( 30 ). In an alternative aspect of the invention, there may be two such multiple pane units ( 1, 2 ) in a sliding or other type of window. In the closed positions of the window, portions of the seal ( 30 ) of the multiple pane units are aligned and one of the multiple pane units ( 1 ) has at least one of its panes ( 38 ) extending beyond the seal ( 30 ).
1. A window comprising:
a first pane assembly mounted in an opening, the first pane assembly comprising:
a first pane;
a second pane; and
a first seal disposed between the first and second panes to form a sealed chamber between the first and second panes; and
a second pane assembly also mounted in the opening, at least one of the first and second pane assemblies being slidable with respect to the other pane assembly between an open position and a closed position, the second pane assembly comprising:
a third pane;
a fourth pane longer than the third pane; and
a second seal disposed between the third and fourth panes to form a sealed chamber between the third and fourth panes, wherein when the first and second pane assemblies are in the closed position, the fourth pane of the second pane assembly extends beyond the third pane and beyond the second seal so as to overlap with the first pane assembly.
2. The window as claimed in claim 1 wherein each pane assembly comprises a double glazed unit.
3. The window as claimed in claim 2 wherein each pane assembly is provided without peripheral frame members holding the panes together.
4. The window as claimed in claim 1 wherein the pane assemblies are arranged in a double hung configuration.
5. The window as claimed in claim 4 wherein the pane assemblies are arranged in a counterbalanced configuration.
6. The window as claimed in claim 1 wherein the pane assemblies are arranged in a horizontal sliding configuration.
7. The window as claimed in claim 1 wherein the two pane assemblies are arranged in a double hung configuration with one of the pane assemblies serving as an upper pane assembly and the other serving as a lower pane assembly.
8. The window as claimed in claim 7 wherein the second pane assembly serves as the upper pane assembly, and the bottom of the fourth pane of the upper pane assembly extends beyond the seal to overlap the lower pane assembly.
9. The window as claimed in claim 8 wherein the fourth pane comprises an exterior pane of the second pane assembly.
10. The window as claimed in claim 8 wherein the fourth pane comprises an interior pane of the second pane assembly.
11. The window as claimed in claim 8 wherein the third pane of the second pane assembly also extends beyond the first seal of the lower pane assembly.
12. The window as claimed in claim 1 wherein the extension of the fourth pane beyond the second seal is in the range of 50 mm and 150 mm.
13. The window as claimed in claim 1 , further comprising sealing strips to seal gaps between the pane assemblies.
14. The window as claimed in claim 13 wherein the sealing strips are removable.
15. The window as claimed in claim 13 wherein the sealing strips are comprised of translucent or transparent material.
16. The window as claimed in claim 1 wherein the two pane assemblies are arranged in a horizontal sliding configuration with aligned portions of the seals extending vertically centrally of the window.