Patent ID: 8950299
Filing Date: 2015-02-10
Classification: B25B

Abstract:
1. A locking pliers comprising: a fixed handle having front and rear handle portions opposite to each other in a longitudinal direction; a fixed law having a first connected portion connected securely to said front handle portion, and having a first working portion extending forwardly from said first connected portion to terminate at a first nose end; a movable jaw having a second connected portion extending in a transverse direction to terminate at movable and fixed pivoting regions, and having a second working portion extending forwardly from said second connected portion to terminate at a second nose end; a movable handle having a front pivot portion pivotally connected to said fixed pivoting region about a pivotal axis in an axial direction transverse to the longitudinal and transverse directions, and having a rear actuating portion extending rearwardly from said front pivot portion; a movable pivot unit comprising: a biasing member disposed between said fixed handle and said second connected portion to bias said pivot pin toward an initial position; and a lock unit disposed to guard said movable jaw against displacement from a locking position toward the initial position by counteracting a biasing action of said biasing member once a manual turning force is applied to said movable handle to turn said movable pivoting region of said movable jaw clockwise about the pivotal axis to the locking position is removed, thereby locking said pivot pin at the locking position; with said leading and trailing regions disposed opposite to each other relative to said pivot pin, wherein once the manual turning force continuously applied to said movable handle to further turn said movable pivoting region clockwise about the pivotal axis is removed, a friction force generated as a result of the abutting engagement between said pivot pin and said leading region counteracts the biasing action of said biasing member to prevent said pivot pin from moving away from a tightening position; wherein said inner tubular surface defining a central axis with said leading region, said middle region and said trailing region angularly displaced to one another about the central axis, with said inner tubular surface having a diameter larger than that of said pivot pin; and wherein the locking unit comprises: