Patent ID: 7490445

Claim:
An integrated window sash, comprising: a sash frame having a first sheet supporting surface, a second sheet supporting surface spaced from the first sheet supporting surface, and a base between the first and second sheet supporting surfaces, the base defining an opening; a first sheet having a first major surface and an opposite second major surface with marginal edge portions of the first surface of the first sheet secured to the first sheet supporting surface, the first sheet sized to pass through the opening toward the first sheet supporting surface; a second sheet having a first major surface and an opposite second major surface with marginal edge portions of the first surface of the second sheet secured to the second sheet supporting surface, the second sheet sized to be larger than the opening wherein the first major surface of the second sheet faces the second major surface of the first sheet and is spaced therefrom to provide a compartment between the sheets; a retainer between the sheets, the retainer comprising an elongated member having a first hollow end and an opposite second hollow end; a first end cap moveable into and out of the first end of the elongated member and a second end cap moveable into and out of the second end of the elongated member, and a biasing member in the elongated member to bias the first end cap out of the first end of the elongated member, to bias the second end cap out of the second end of the elongated member and to bias the first and second end caps away from one another, wherein the first end cap acts on the second surface of the first sheet to bias the first sheet toward the first sheet supporting surface, and the second end cap acts on the first surface of the second sheet, and a glazing member mounted on the sash frame and acting on the marginal edges of the second surface of the second sheet.