Double-Drive and Ratcheting Screwdrivers: How Geared Mechanisms Improve Fastening Efficiency
Standard screwdrivers require the user to reposition the grip after each half-turn, which slows down repetitive fastening tasks. Ratcheting and double-drive mechanisms solve this problem by allowing continuous rotation without lifting the tool. A screwdriver with a double-drive feature combines the twisting action of the handle with a push-and-turn motion that doubles the turning speed. […]
