Patent ID: 8001742

Claim:
A tubular muntin bar assembly comprising: a) a first muntin bar formed from an elongated tube having ends that engage a window spacer frame and include side walls that have relatively narrow top and bottom planar walls and relatively wider side planar walls, said top and bottom planar walls defining one or more slots that define positions for intersecting muntin bars; b) one or more intersecting muntin bars formed from elongated tubes having one end that engages the first elongated muntin bar in a region of a slot; c) one or more joiner clips for positioning the one or more intersecting muntin bars in relation to said first muntin bar comprising: i) a tree portion that extends into one end of said intersecting muntin bars to support the intersecting muntin bars in relation to the first muntin bar; ii) an anchor portion including a flexible body which flexes to a configuration which allows said flexible body to extend through a first slot of said first muntin bar as the tree portion extends through a second slot of the first muntin bar in a wall of the first muntin bar contacted b an associated intersecting muntin bar which engages the tree portion; and iii) a tab laving an abutting portion that seats against an outer wall the first muntin bar at the region of the first slot to fix in position the joiner clip with respect to the first muntin bar and further having a generally planar, outwardly facing cover having a surface area greater than an area of the first slot which overlaps edges around a perimeter of the first slot.