Two-jaw, two-handled spanner or pipe grip, includes variable-position point of rotation following curved track maintaining defined geometrical relationships

摘要

The point of rotation (5) at the pliers joint, can occupy a range of positions in and along the curved adjustment slot (8), to provide adjustable jaw separation. In all possible positions, the point of rotation (5), lies ahead of a tangent line (19) running at right angles to the jaw planes, at the rear edge of the jaw opening. The tangent line (19) runs at right angles to the upper straight line (15) along the upper jaw face (14). The tangent line touches the rear corner (12) of the largest hexagonal object (11) to be held.