US Patent [1998-05-19] - Pliers with an integral pivot (US5,752,419 Liou, Mou-Tang)
A pair of pliers includes a first plier member and a second plier member each including a jaw, an intermediate portion, and a handle portion. The intermediate portion of the second plier member includes an elongate slot having a narrowed section in a mediate portion thereof. The intermediate portion of the first plier member includes an integral stub formed on one side thereof which faces the intermediate portion of the second plier member. A pivot extends upwardly from the stub and extends through the elongate slot. A block is integrally formed on the side of the intermediate portion of the first plier member adjacent to the jaw of the first plier member, an engaging pin extending upwardly from the block. A cover plate is mounted to the first and the second piler members and includes two holes through which the engaging pin and the pivot extend, respectively. The engaging pin and the pivot are riveted to securely hold the first and the second plier members together. Link to USPTO.