Pivot bar for window sash

1. A pivot bar for a tiltable window sash comprising:

an elongated body having first and second opposing ends and upper and lower opposing surfaces extending between the first and second ends, the elongated body having a first longitudinal axis extending through the first and second ends about which the tiltable window sash is tiltable, the first end of the elongated body configured to be received in a carrier of a window balance assembly;

a retaining member extending upward from the upper surface of the elongated body that is resiliently flexible relative to the elongated body and comprises a first fixed end and a first free end; and

an anti-rotation feature comprising a projection extending outward from the elongated body substantially perpendicular to the first longitudinal axis;

wherein the first fixed end of the retaining member comprises a hinge portion connecting the retaining member to the elongated body;

wherein the first free end of the retaining member comprises a ramp surface inclined from the first fixed end outwardly from the upper surface of the elongated body and toward the first end;

wherein the ramp surface is pivotable about the hinge portion to a position such that the ramp surface is substantially coplanar with the upper surface of the elongated body;

wherein the anti-rotation feature is disposed intermediate the first end of the elongated body and the retaining member and engages an aperture in a vertical stile of the window sash to prevent rotation of the pivot bar;

wherein a distal tip of the first free end is configured to engage the vertical stile of the window sash; and

wherein the anti-rotation feature and the retaining member are configured to cooperably engage the tiltable window sash and securely attach the pivot bar thereto.

2. A pivot bar for a tiltable window sash comprising:

an elongated body having first and second opposing ends and upper and lower opposing surfaces extending between the first and second ends, the elongated body having a first longitudinal axis extending through the first and second ends about which the tiltable window sash is tiltable, the first end of the elongated body configured to be received in a carrier of a window balance assembly;

a first retaining member resiliently flexible relative to the elongated body and extending outward from the lower surface of the elongated body, the first retaining member comprising a first leg extending from the lower surface of the body along a second longitudinal axis that is substantially perpendicular to the first longitudinal axis and a second leg extending from a first distal end of the first leg along a third longitudinal axis that is substantially parallel to the first longitudinal axis, the second leg having a first retaining prong protruding toward the lower surface of the elongated body; and

an anti-rotation feature comprising a fourth longitudinal axis that is perpendicular to the first longitudinal axis and substantially collinear with the second longitudinal axis and a projection extending from at least one of the upper surface and the lower surface of the elongated body in a first direction substantially perpendicular to the upper surface or the lower surface;

wherein the anti-rotation feature is configured to engage a first surface of the window sash in a second direction perpendicular to the first longitudinal axis and the first direction; and

wherein the anti-rotation feature and the first retaining member are configured to cooperably engage the tiltable window sash and securely attach the pivot bar to the tiltable window sash.

3. The pivot bar of claim 2 , further comprising a second retaining member extending from the lower surface of the elongated body and offset from the first retaining member along the first longitudinal axis; and

wherein the anti-rotation feature, the first retaining member, and the second retaining member are configured to cooperably engage the window sash and securely attach the pivot bar to the window sash.

4. The pivot bar of claim 3 , wherein the second retaining member is resiliently flexible relative to the elongated body;

wherein the second leg of the first retaining member has a second length along the third longitudinal axis;

wherein the second retaining member comprises a third leg along a fifth longitudinal axis and a fourth leg extending from a distal end of the third leg and having a fourth length along the third longitudinal axis and a second retaining prong protruding toward the lower surface of the elongated body;

wherein the fourth length is greater than the second length.

5. A tiltable window sash comprising the pivot bar of claim 4 .

6. A tiltable window sash comprising the pivot bar of claim 2 .

7. A tiltable window sash comprising:

a frame comprising an upper end and a lower end, a first vertical stile, a horizontal rail and a second vertical stile, the first and second vertical stiles connected to opposite ends of the horizontal rail at the lower end of the frame;

wherein the first vertical stile comprises a first aperture, the second vertical stile comprises a second aperture and the horizontal rail comprises a third aperture adjacent to the first aperture and a fourth aperture adjacent to the second aperture;

a first pivot bar attached to the frame at the first vertical stile and the horizontal rail and a second pivot bar attached to the frame at the second vertical stile and the horizontal rail, each pivot bar comprising:

an elongated body having first and second opposing ends and upper and lower opposing surfaces extending between the first and second ends, the elongated body having a first longitudinal axis extending through the first and second ends about which the tiltable window sash is tiltable, the first end of the elongated body configured to be received in a carrier of a window balance assembly;

a retaining member resiliently flexible relative to the elongated body and extending outward from the lower surface of the elongated body, the first retaining member comprising a first leg extending from the lower surface of the body along a second longitudinal axis that is substantially perpendicular to the first longitudinal axis and a second leg extending from a distal end of the first leg along a third longitudinal axis that is substantially parallel to the first longitudinal axis, the second leg having a retaining prong protruding toward the lower surface of the elongated body;

wherein the retaining prongs of the first and second pivot bars respectively engage the third and fourth apertures of the horizontal rail; and

an anti-rotation feature comprising a fourth longitudinal axis that is perpendicular to the first longitudinal axis and substantially collinear with the second longitudinal axis and a projection extending from at least one of the upper surface and the lower surface of the elongated body in a first direction substantially perpendicular to the upper surface or the lower surface;

wherein the anti-rotation feature of each of the first and second pivot bars is configured to engage the first and second vertical stiles, respectively, in a second direction perpendicular to the first longitudinal axis and the first direction; and

wherein the anti-rotation features and the retaining members are configured to cooperably engage the first and second vertical stiles to securely attach the pivot bars to the frame.

8. The tiltable window sash of claim 7 , wherein the first horizontal rail further comprises a fifth aperture and a sixth aperture located near the first vertical stile and a seventh aperture and an eighth aperture located near the second vertical stile;

wherein each of the first pivot bar and second pivot bar further comprises a second retaining member resiliently flexible relative to the elongated body and extending outward from the lower surface of the elongated body, the second retaining member comprising a third leg extending from the lower surface of the body along the second longitudinal axis and a fourth leg extending from a distal end of the third leg along a third longitudinal axis, the fourth leg having a second retaining prong protruding toward the lower surface of the elongated body;

wherein the third legs of the second retaining members of the first and second pivot bars respectively extend through the fifth and seventh apertures and the second retaining prongs respectively engage the sixth and eighth apertures.

9. A window assembly comprising the tiltable window sash of claim 8 .

10. The tiltable window sash of claim 8 , wherein a length of the second leg of the retaining member is less than a length of the fourth leg of the second retaining member.

11. A window assembly comprising the tiltable window sash of claim 7 .