Ratchet wheel with asymmetric arcuate concave teeth or non-arcuate concave teeth and ratcheting tools with such ratchet wheel

摘要

A ratchet wheel (20) includes an outer periphery. The outer periphery includes a number of arcuate concave teeth (22) each having two sides (RA and RB) and an intersection (R) of the two sides. The ratchet wheel includes a center (O), a line (OR) from the center (O) to the intersection (R) dividing an angle between the two sides into two unequal portions, thereby forming asymmetric arcuate concave teeth (22) to provide improved structural strength and improved torque. In another embodiment, the concave teeth are non-arcuate to reduce the formation time for the teeth, thereby reducing the production cost.