Patent ID: 8726582

Claim:
A breakaway coupling made of a durable material for joining a generally vertical pole structure to a supporting foundation, the breakaway coupling comprising: a multi-sided, elongated body of single piece construction; said multi-sided, elongated body having an upper end, a lower end, an internally threaded bore extending between said upper end and said lower end of said multi-sided, elongated body, and an outer surface; said outer surface having at least one horizontally disposed, circumferential groove extending partially into said multi-sided, elongated body towards said internally threaded bore and extending to a critical notch depth; said critical notch depth is of an enabling failure depth to enable failure of the breakaway coupling only along said at least one horizontally disposed, circumferential groove upon application of a predetermined minimal impact force; and wherein the durable material is a free-cutting brass alloy with a composition of 58-65% copper, 33-39% zinc and 1-5% lead.