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Self adjusting pliers for grasping a workpiece include first and second plier members each including a handle portion, a jaw portion, and an intermediate portion therebetween. The self-adjusting pliers include a first pivot pin about which the first and second plier members pivot permitting the jaw

Self adjusting pliers for grasping a workpiece include first and second plier members each including a handle portion, a jaw portion, and an intermediate portion therebetween. The self-adjusting pliers include a first pivot pin about which the first and second plier members pivot permitting the jaw portions to converge on a workpiece and grasp the workpiece in response to initial movement of the handle portions toward each other. The self adjusting pliers further include a second pivot pin about which the pliers pivot once pivoting has been terminated about the first pivot pin so as to permit a further grasping force to be applied to the workpiece in response to continued movement of the handle portions toward each other. The second pivot pin is closer to the jaw portions than the first pivot pin to allow for a greater mechanical advantage to be obtained. The self adjusting pliers also include a biasing spring for biasing the handle portions away from each other and the jaw portions away from each other. Self-locking pliers are also provided, either in combination with the self-adjusting pliers or individually, for automatically locking the jaw portions into engagement with a workpiece.

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[ What is claimed is:] [1.] Self-adjusting pliers for grasping a workpiece comprising:first and second plier members each including a handle portion, a jaw portion, and an intermediate portion therebetween;a first pivot on said intermediate portions permiting said jaw portions to converge on the wor

[ What is claimed is:] [1.] Self-adjusting pliers for grasping a workpiece comprising:first and second plier members each including a handle portion, a jaw portion, and an intermediate portion therebetween;a first pivot on said intermediate portions permiting said jaw portions to converge on the workpiece and grasp the workpiece in response to initial pivotal movement of said handle portions toward each other;said first pivot includes a first pivot pin attached to said intermediate portion of said second plier member and a positionig slot formed in said intermediate portion of said first plier mnember, said positioning slot having a generally arcuate portion and a shifting slot portion in comunication therewith;said first pivot pin being slidably received in said positioning slot;said first pivot pin is positioned in said shifting slot portion of said positioning slot during the initial pivotal movement of said handle portions toward each other to grasp the workpiece;a second pivot on said intermediate portions permitting a further grasping force to be applied to the workpiece in response to continued pivotal movement of said handle portions toward each other;said second pivot being closer to said jaw portions than said first pivot; andbiasing means structured (a) for acting in cooperation with said first pivot to maintain said first pivot pin positioned in said shifting slot during the initial pivotal movement of said handle portions and (b) for biasing said handle portions away from each other and said jaw portions away from each other.