Window assembly with integrated pleated screen

1. A window assembly, the window assembly comprising:

a window frame comprising:

a pair of spaced-apart side frame members;

a first end frame member connected to a first end of the pair of side frame members, said first end frame member comprising a substantially planar window sash contact surface; and

a second end frame member connected to a second end of the pair of side frame members opposite the first end of the pair of side frame members;

at least a pair of spaced-apart guide tracks, each of the pair of spaced-apart guide tracks being connected to a respective one of the side frame members;

at least one window sash mounted to and positioned between the at least a pair of spaced-apart guide tracks and being slidably movable along the guide tracks between an open position wherein an end of the at least one window sash is spaced apart from the first end frame member and a closed position wherein the end of the at least one window sash abuttingly contacts the first end frame member window sash contact surface;

a foldable and spreadable continuous seamless pleated screen, said pleated screen comprising a single integral continuous unitary seamless flexible screen element, and

at least two tubes, each of the tubes being located within a respective one of the at least a pair of spaced-apart guide tracks, each of the tubes traversing holes in a respective one of the side ends of the pleated screen and each of the tubes being housed within a respective one of the side frame members,

wherein the pleated screen has a first screen end mounted to the end of the at least one window sash and a second screen end mounted to the first end frame member so that the pleated screen extends when the at least one window sash is in the open position and the pleated screen folds onto itself when the at least one window sash is in the closed position, wherein a second end of one of the window sashes opposite the first end comprises a pivotable flap having an extremity in movable contact with another one of the pair of window sashes, and wherein the end of the at least one window sash comprises a cavity formed therein extending substantially the length of the end of the at least one window sash and the pleated screen is housed within the cavity when the at least one window sash is in the closed position.

2. A window assembly, the window assembly comprising:

a window frame comprising:

a pair of spaced-apart side frame members;

a first end frame member connected to a first end of the pair of side frame members, said first end frame member comprising a substantially planar window sash contact surface; and

a second end frame member connected to a second end of the pair of side frame members opposite the first end of the pair of side frame members;

at least a pair of spaced-apart guide tracks, each of the pair of spaced-apart guide tracks being connected to a respective one of the side frame members;

at least one window sash mounted to and positioned between the at least a pair of spaced-apart guide tracks and being slidably movable along the guide tracks between an open position wherein an end of the at least one window sash is spaced apart from the first end frame member and a closed position wherein the end of the at least one window sash abuttingly contacts the first end frame member window sash contact surface;

a foldable and spreadable continuous seamless pleated screen, said pleated screen comprising a single integral continuous unitary seamless flexible screen element; and

at least two tubes, each of the tubes being located within a respective one of the at least a pair of spaced-apart guide tracks, each of the tubes traversing holes in a respective one of the side ends of the pleated screen and each of the tubes being housed within a respective one of the side frame members,

wherein the pleated screen has a first screen end mounted to the end of the at least one window sash and a second screen end mounted to the first end frame member so that the pleated screen extends when the at least one window sash is in the open position and the pleated screen folds onto itself when the at least one window sash is in the closed position, wherein a second end of one of the window sashes opposite the first end comprises a pivotable flap having an extremity in movable contact with another one of the pair of window sashes, and wherein the end of the at least one window sash comprises a cavity formed therein extending substantially the length of the end of the at least one window sash and the pleated screen is housed within the cavity when the at least one window sash is in the closed position.

3. The window assembly according to claim 1 , wherein side ends of the pleated screen are guided by the at least a pair of spaced-apart guide tracks.

4. The window assembly according to claim 1 , wherein each of the tubes is made of a fluorinated polymer.

5. The window assembly according to claim 2 , wherein the second screen end of the pleated screen comprises a lamella along a length thereof to maintain contact between the second end of the pleated screen and the first end frame member through a dead weight of the lamella and wherein the lamella is installable in a groove offset from the first end frame member, in order to maintain the pleated screen in a second alternate open configuration.

6. The window assembly according to claim 5 , wherein the lamella is made of a metal selected from the group consisting of bronze and brass.

7. A window assembly, the window assembly comprising:

a window frame comprising:

a pair of spaced-apart side frame members;

a first end frame member connected to a first end of the pair of side frame members, said first end frame member comprising a substantially planar window sash contact surface; and

a second end frame member connected to a second end of the pair of side frame members opposite the first end of the pair of side frame members;

at least two pairs of spaced-apart guide tracks, each of the pair of spaced-apart guide tracks being connected to a respective one of the side frame members;

at least a pair of window sashes, one of the pair of window sashes being mounted to and positioned between one of the at least two pair of spaced-apart guide tracks and being slidably movable along the one of the at least two pair of spaced-apart guide tracks between an open position wherein a first end of the one of the pair of window sashes is spaced apart from the first end frame member and a closed position wherein the first end of the one of the pair of window sashes abuttingly contacts the first end frame member window sash contact surface;

a foldable and spreadable continuous seamless pleated screen, said pleated screen comprising a single integral continuous unitary seamless flexible screen element, and

at least two tubes, each of the tubes being located within a respective one of the at least a pair of spaced-apart guide tracks, each of the tubes traversing holes in a respective one of the side ends of the pleated screen and each of the tubes being housed within a respective one of the side frame members,

wherein the pleated screen has a first screen end mounted to the end of the at least one window sash and a second screen end mounted to the first end frame member so that the pleated screen extends when the at least one window sash is in the open position and the pleated screen folds onto itself when the at least one window sash is in the closed position, wherein a second end of one of the window sashes opposite the first end comprises a pivotable flap having an extremity in movable contact with another one of the pair of window sashes, and wherein the end of the at least one window sash comprises a cavity formed therein extending substantially the length of the end of the at least one window sash and the pleated screen is housed within the cavity when the at least one window sash is in the closed position.

8. The window assembly according to claim 7 , wherein another one of the pair of window sashes is mounted to and positioned between another one of the at least two pair of spaced-apart guide tracks and is slidably movable along the another one of the at least two pair of spaced-apart guide tracks between an open position wherein a first end of the another one of the pair of window sashes is spaced apart from the second end frame member and a closed position wherein the first end of the another one of the pair of window sashes abuttingly contacts the second end frame member.

9. The window assembly according to claim 8 , wherein a second end of the another one of the pair of window sashes opposite the first end comprises a pivotable flap having an extremity in movable contact with the one of the pair of window sashes.

10. The window assembly according to claim 7 , wherein the pivotable flap is selected from a group consisting of a brush and a nylon strip.

11. The window assembly according to claim 7 , wherein side ends of the pleated screen are guided by the one of the at least two pair of spaced-apart guide tracks.

12. The window assembly according to claim 7 , wherein the second screen end of the pleated screen comprises a lamella along a length thereof to maintain contact between the second end of the pleated screen and the first end frame member through a dead weight of the lamella and wherein the lamella is installable in a groove offset from the first end frame member, in order to maintain the pleated screen in a second alternate open configuration.