Tilt-to-clean-in-all-weather window with hidden insect screening

An apparatus comprising:

• a single-hung, tilt-to-clean window having an upper sash and a lower sash operable within a window frame;
• said window frame being rectangular with a horizontal head member having one end rigidly connected to an upper end of a first vertical window jamb, an opposing second end rigidly connected to an upper end of a second vertical window jamb, and a horizontal sill member rigidly connected between respective lower ends of said window jambs;
• said upper sash being rectangular with a planar upper glazing, with the perimeter edges of said upper glazing surrounded by an upper sash frame, said upper sash frame consisting of a first horizontal top rail having a first end rigidly connected to an upper end of a first vertical upper sash stile and an opposing second end rigidly connected to an upper end of a second vertical upper sash stile with a first horizontal bottom rail rigidly connected between respective lower ends of said upper sash stiles;
• said upper sash frame being pivotally attached to said first and second jambs by a first upper sash pivot axle fixed to the bottom of the first end of said first bottom rail and by a second upper sash pivot axle fixed to the bottom of a second opposing end of said first bottom rail, said first axle being engaged by a first pivot receiver fixed into said first jamb and said second axle being engaged by a second pivot receiver fixed into said second jamb, with said upper sash being held upright in said window frame, against rotation about said pivots, by one or more upper sash tilt latches;
• said lower sash being rectangular with a planar lower glazing, with the perimeter edges of said lower glazing surrounded by a lower sash frame, said frame consisting of a second horizontal top rail having a first end rigidly connected to an upper end of a first vertical lower sash stile and an opposing second end rigidly connected to an upper end of a second vertical lower sash stile with a second horizontal bottom rail rigidly connected between respective lower ends of said lower sash stiles;
• said lower sash frame being, when measured from the most-lateral face of said lower sash first stile to the most-lateral face of said lower sash second stile, approximately one inch greater than the respective measurement for said upper sash, with the bottom of the first end of said second bottom rail having a first lower sash pivot axle pivotally attaching said lower sash to a first lower sash pivot/guide assembly slidingly retained in a first trackway recessed into said first jamb and with the bottom of the opposing second end of said second bottom rail having a second lower sash pivot axle pivotally attaching said lower sash to a second lower sash pivot/guide assembly slidingly retained in a second trackway recessed into said second jamb, the weight of said lower sash on said pivot/guide assemblies being counterbalanced, with said trackways being aligned such that said lower sash travels to the room side of said upper sash, all with said lower sash being held upright in said window frame, against rotation about the pivots in said pivot/guide assemblies, by one or more lower sash tilt latches;
• said first jamb having a stepped cross-section formed by:
• a first vertical surface oriented perpendicular to the plane of said lower sash glazing and located
• parallel to and lateral from said most-lateral surface of said first lower sash stile;
• a second vertical surface parallel to said first vertical surface and approximately one-half inch closer to the center of said upper and lower sashes, and thereby being parallel to and lateral from said most-lateral surface of said first upper sash stile;
• a first shoulder, formed by a third vertical surface between and normal to said first and second vertical surfaces, defining a first step in said first jamb, which step, being adjacent to the weather-ward face of said lower sash, serves to mitigate against wind blowing into the gap located between said first vertical surface and said lower sash;
• a second shoulder, formed by a fourth vertical surface approximately one-half inch in breadth and normal to said second vertical surface, defining a second step in said first jamb, which step, being adjacent to the weather-ward face of said upper sash, serves to mitigate against wind blowing into the space located between said second vertical surface and said upper sash;
• said second jamb having a cross-section mirroring the cross-section of said first jamb;
• a flexible baffle comprising a flexible fin member, said flexible baffle being attached to said upper sash or said lower sash in a horizontal longitudinal cavity provided between said first bottom rail of said upper sash and said second top rail of said lower sash when said sashes are each in a closed position, said flexible fin member remaining flexed within said cavity until said lower sash is moved into a ventilating position and said second top rail of said lower sash rises above said first bottom rail of said upper sash, whereupon said flexible fin member un-flexes and extends horizontally to continuously contact, if attached to said upper sash, said lower glazing and said vertical stiles of said upper sash, or, if attached to said lower sash, to continuously contact said upper glazing and said vertical stiles of said lower sash, thereby sealing off the opening between said upper sash and said lower sash;
• a screen rollup assembly comprising a section of insect screen fabric, a section of impervious membrane and a shafted self-storing roller unit;
• said roller unit, having said shaft furnished with a spring to rotate said shaft, is mounted inside of and spanning a length of a longitudinal cavity within said sill;
• said section of insect screen fabric, having a top horizontal end attached along the weather-side face of said lower sash's bottom rail is furnished with a width matching the width of said lower sash and a length at least as great as the maximum distance said lower sash may travel for ventilation;
• said section of impervious membrane, being impervious to wind and precipitation, has a top horizontal end attached to said insect screen fabric's bottom horizontal end and a bottom horizontal end attached to said rollup shaft, the width of said section of impervious membrane matching the width of said section of insect screen fabric, and the length of said impervious membrane being at least as great as the distance between said sill and said head, all such that the sum total length of said section of insect screen fabric and the attached section of said impervious membrane equals at least twice the height of the window opening from head to sill plus twice the width of said head member from weather-side to room-side;
• wherein the assembly of said insect screen fabric and impervious membrane is configured to unroll from said rollup shaft as said lower sash is moved vertically away from said sill member, from a closed position to a ventilation position, or as said lower sash is titled out of said window frame for cleaning of the exterior surfaces of said lower glazing, said assembly also being configured to roll back onto said rollup shaft when said lower sash is lowered from said ventilation position to said closed position and when said lower sash is tilted from its tilted-for-cleaning position back to its typical vertical position;
• a horizontal straight rigid tube located, when said lower sash is closed, proximate to where the weather-side face of the bottom of said lower sash is proximate to said sill, with said tube being to the room-side of said insect screen fabric;
• a straight rigid rod running through said tube, said rod having a first end engaged by a first rod guide groove located at the intersection of said first jamb and said sill, with said first rod guide groove being extended, by a first curved section of groove, to a first vertical groove in said first jamb, making a continuous groove from said weather-side face of said lower sash up to said head member, and said rod having an opposing second end engaged by a second rod guide groove located at the intersection of said second jamb and said sill, with said second rod guide being extended, by a second curved section of groove, to a second vertical groove in said second jamb to respectively match said continuous path in said first jamb;
• whereby said rod is guidable from its at-rest position when said lower sash is closed, across the upper face of said sill, up the weather-side of said first jamb and up the weather-side face of said second jamb to proximate to said head member;
• a pair of cables attached to a cable grip serving as a handle, said cable grip being detachably attached to the room-side of said sill member with the first cable of said cable pair being guided through said sill member, said first jamb and said head member to the upper-most part of said first vertical groove where said first cable is guided down said first vertical groove and continued in said first rod guide groove to meet said rod, where said first cable is attached to said first end of said rod, and with the second cable of said cable pair being guided through said sill member, said second jamb and said head member to the upper-most part of said second vertical groove where said second cable is guided down said second vertical groove and continued in said second rod guide groove to meet said rod, where said second cable is attached to said opposing second end of said rod;
• wherein said cable grip, upon being detached from said sill member and relocated away from said sill member, causes said first cable and said second cable to simultaneously pull said ends of said rod along said grooves, away from said rod's said at-rest position to a fully-risen position proximate to said head member;
• and
• one or more latches to hold said rod in place when said rod is raised to said fully-risen position, said latch or latches being releasable when it is desired for said rod to return to its said at-rest position, with said return being accomplished when said rod responds to said cables being pulled by a rollup tension furnished into said self-storing roller unit;
• whereby during the cleaning of said sashes, even when said sashes are tilted within said window frame, said movement of said rod to said fully-risen position causes said tube to draw said assembly of insect screen fabric and impervious membrane from off said rollup shaft to close said window frame's opening against flying insects, wind and precipitation;
• wherein, when said window sashes are not tilted for cleaning, said impervious membrane is hidden from sight;
• and
• wherein, when said lower sash is not open for ventilation, said insect screen fabric and impervious membrane are hidden from sight.