Patent ID: 6854698

Claim:
An upper channel for use in an extension arm that adjustably mounts a device to a support mount, said upper channel comprising a U-shaped body having first and second ends, said body including a pair of spaced apart sidewalls each having an outer surface and a bottom wall, a first roller at the first end of said body and a second roller at the second end of said body, said first roller having spaced apart ends adjacent said outer surface of said sidewalls, said first roller between said sidewalls including a pair of spaced apart roller walls extending transversely between said sidewalls, said spaced apart roller walls forming an opening therebeteween and each roller wall having an upper edge, wherein said upper edge of said roller walls from said bottom wall being less than the height of said ends of said first roller from said bottom wall, and wherein said pair of spaced apart roller walls are integrally attached to both said sidewalls and said bottom wall.