| 摘要 |
Slip-joint pliers of the present invention comprise, in one embodiment, a pair of compound handles pivotally attached to jaw means being upper and lower jaw members having a manually adjustable slip-joint therein for providing at least two different maximum jaw opening positions, each having a different separation angle. The jaw openings are selectable by movement of a lever, for example, attached to a keyed pivot pin in the slip-joint. The jaw openings are selectable with minimal movement of the compound handles as a result of spring biasing between the jaw members and abutting engagement with the compound handles. A further embodiment without the compound handles has the spring biasing between the jaw arms and a limiting bracket, for example, mounted on pivot pins in the handles attached to the jaw arms to restrict the separation of the handles in an outwardly direction so that the spring will constantly bias the jaw arms apart so that the operation of the lever described herein, or other device, functions in a similar manner as in the compound pliers. In the first embodiment, for example, operation of the manual slip-joint causes the jaw members to automatically separate to achieve a large maximum jaw opening position. The method of using the pliers of the present invention requires that the manually adjustable slip-joint be positioned in a disengaged mode to allow the jaw members to move to a predetermined separation angle. At which point, the slip-joint is engaged which allows the use of the pliers to grip work pieces of different sizes. By use of either one or both hands, the jaw members may be moved to another predetermined separation angle.
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