US Patent 7510159 Hanger bar centering mechanism

A hanger bar centering mechanism comprises a first elongate member having a first end and a second end, a second elongate member having a first end and a second end, the first and second members are symmetrically formed, the first and second elongate members each have at least one corresponding notch portion, and the notch portions are aligned for providing positive feedback when the first and second members are slidably positioned relative to each other in a preselected specific position.