Importance

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Abstract

The present invention provides a pair of locking pliers, comprising a main clamp body, a movable jaw, a movable handle, a link, a wedge-shaped piece and an adjusting mechanism. When the jaw span reaches maximum, the pair of locking pliers satisfies the following relations: H/D₁≧0.5, (D₂+D₃)/D₁≦3.1, D₂/D₃≧0.45, wherein H is the distance between the center of the first pivot and the axis X of the fixed handle passed through the center of the fourth pivot, D₁ is the distance between the center of the first pivot and the center of the second pivot, D₂ is the distance between the center of the second pivot and the center of the third pivot, D₃ is the distance between the center of the third pivot and the center of the fourth pivot. The maximum opening angle of the jaw span of the invention can reach 49°, which results in the fact that the pair of locking pliers can efficiently and conveniently clamp large-size working piece. The clamping force can he adjusted and has nothing to do with the clamped working piece, which is beneficial to clamp the working pieces with different sizes. In addition, when the jaw span reaches the maximum, the angle between the movable handle and the fixed handle is relatively small, which is convenient for operating the pair of locking pliers with single hand.

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First Claim