US Patent 7562449 Method of connecting terminal to wire

Inwardly-directed projecting portions (2, 3) are formed in a bent manner respectively at distal ends of a pair of clamping piece portions (4, 5) which are continuous with each other, and form a wire connection portion (7) of a terminal (1). A conductor portion (9) of a wire (8) is located on the inner sides of the pair of clamping piece portions (4, 5), and the pair of clamping piece portions are pressed over an entire periphery into a circular shape, and are extended in a peripheral direction, thereby causing projecting extension portions (2′, 3′), including the projecting portions (2, 3), to bite into the conductor portion. Before the pressing operation, the pair of clamping piece portions (4, 5) may be provisionally pressed to be curved, thereby causing distal ends of the projecting portions (2, 3) to bite slightly into an outer peripheral surface of the conductor portion (9).