Ventilating unit

Claim 2

A ventilating unit within a window frame having opposed end jambs, an interior side and an exterior side, said ventilating unit comprising, a. a base panel extending transversely between said opposed end jambs, said base panel having at least one fresh air intake opening, b. a top panel extending transversely between said opposed end jambs in spaced relation above said base panel to define an inner ventilating opening between said base panel and top panel, c. an exterior closure plate extending between said opposed end jambs from said top panel to a level below said base panel at the exterior side of said window frame, d. a pair of opposed jamb guides attached to said opposed end jambs between said base panel and said top panel, said jamb guides each having a convex guide surface, e. a pair of opposed jamb fillers attached to said opposed end jambs, said jamb fillers each having a concave guide surface radially spaced from a said jamb guide convex guide surface to define a pair of opposed arcuate raceways between said spaced guide surfaces, f. means for adjusting the width of said opposed arcuate raceways, and g. an arcuate panel slidably engaged within said opposed arcuate raceways, said arcuate panel having a lower closed position wherein said panel closes said inner ventilating opening and an upper open position wherein said ventilating opening is substantially unrestricted by said arcuate panel to permit ventilating air to pass through said ventilating unit between said fresh air intake opening and said inner ventilating opening.

Claim 3

The ventilating unit specified in claim 1 wherein the raceway adjusting means includes at least one horizontally extending mounting slot in each jamb guide, and a mounting screw extending through each said slot and threadedly engaged in each end jamb for tightening said jamb guide against said end jamb a desired distance from the spaced jamb filler.

Claim 4

The ventilating unit specified in claim 1 wherein the arcuate panel includes an arcuate end race secured to each end thereof, each said end race having a concave inner face slidably engaged on the convex guide surface of the guide jamb and a convex outer face, said convex outer face supporting a weatherstrip in substantially air-tight slidable frictional engagement with the jamb filler concave guide surface.

Claim 5

The ventilating unit specified in claim 1 wherein an inner panel extends between the opposed end jambs from the base panel downwardly at the interior side of the window frame to close that portion of the frame beneath the ventilating unit, and wherein an outer panel extends between the opposed end jambs from the top panel upwardly at the exterior side of the window frame to close that portion of the frame above the ventilating unit.

Claim 6

The ventilating unit specified in claim 1 wherein a weatherstrip extends around the periphery of the convex surface of the arcuate panel to engage the base panel, top panel and jamb fillers in a continuous manner when the arcuate panel is in its lower closed position to provide a substantially air-tight closure of the inner ventilating opening.

Claim 7

The ventilating unit specified in claim 5 wherein the base panel and the top panel each have a sealing surface which extends between the opposed end jambs to respectively define the lower and upper margins of the inner ventilating opening, and wherein the ends of the base panel and top panel sealing surfaces respectively are approximately flush with the lower and upper ends of the concave guide surfaces of the opposed jamb fillers whereby the arcuate panel weatherstrip will engage the said sealing surfaces and concave guide surfaces in a continuous, substantially air-tight manner when the arcuate panel is in its lower closed position.

Claim 8

The ventilating unit specified in claim 6 wherein the jamb fillers have inwardly facing vertical surfaces which define the ends of the inner ventilating opening, and wherein a limit stop is attached to the arcuate panel, near each end thereof in slidable engagement with the adjacent jamb filler inwardly facing vertical surface to prevent substantial end-to-end movement of said arcuate panel, said limit stop having a lower shoulder which engages the base panel when said arcuate panel reaches its lower closed position to prevent further downward movement thereof, and an upper shoulder which engages the top panel when said arcuate panel reaches its upper open position to prevent further upward movement thereof. 8 A ventilating unit for a window frame having opposed end jambs, an interior side and an exterior side, comprising, a. a base panel extending transversely between said opposed end jambs, said base panel having at least one fresh air intake opening, b. a top panel extending transversely between said opposed end jambs in spaced relation above said base panel to define an inner ventilating oPening between said base panel and top panel, c. an exterior closure plate extending between said opposed end jambs from said top panel to a level below said base panel at the exterior side of said window frame, d. adjustable raceway means attached to said opposed end jambs for providing opposed arcuate raceways of adjustable width within said ventilating unit, and e. an arcuate panel slideably engaged within said opposed raceways, said arcuate panel having a lower closed position wherein said panel closes said inner ventilating opening and an upper open position within said ventilating unit wherein ventilating air may pass from one side of said window frame to the other through said fresh air intake opening and said inner ventilating opening.

Claim 9

The ventilating unit specified in claim 8 wherein each raceway means includes a guide jamb element having a convex guide surface and a jamb filler element having a concave guide surface radially spaced from said convex surface to define the arcuate raceway between said guide surfaces, at least one of said elements being adjustably mounted on said end jamb to permit adjustment of the distance between said guide surfaces.

Claim 10

The ventilating unit specified in claim 9 wherein the jamb guide convex guide surface is a cylindrical external surface, and wherein each jamb guide has a closed end with at least one mounting slot for adjustably attaching said jamb guide to the end jamb.