US Patent 7959520 Putter with aiming arms

A golf putter includes a pair of aiming arms at each end of the putter head having opposite and inward facing arcuate surfaces corresponding to the outline of a golf hole. The aiming arms may be removed manually or may be made to pivot. In the latter, each arm is pivotally connected at opposing ends of the putter head and adapted to pivot about an axis between a forward aiming position and a second position away from the forward aiming position. Control of the rotation of the aiming arms may be by a lever operable from the putter shaft, or by a spring actuated by pushing downward on the putter shaft.