The most prevalent form is the ratcheting socket wrench, often informally called a ratchet. The word "ratchet" is also used informally to refer to a ratcheting socket wrench. Their use prevents damage to the ratcheting mechanism of a socket wrench. In 1935, Conrad Bahr and George Pfefferle patented an adjustable ratcheting torque wrench. A lever attached to a ratcheting mechanism was used to rotate the cylinder. The ratcheting mechanism prevents the freewheel being loosened when the sprockets are turned counter-clockwise. This includes handcuffs, zip ties and ratcheting pulleys. Handheld tools (sometimes called "crimping pliers") are most common, which may be ratcheting. Some cranksets have been produced that incorporate a ratcheting mechanism to accommodate coasting. The lap bar also features shin guards and a pneumatic ratcheting system to lock. Non-hydraulic dashpots may use a ratcheting gear to permit free motion in one direction. It is operated by a single ratcheting trigger shifter with two-way release. The center position of the gear release prohibits the ratcheting effect. Passengers are restrained with a single ratcheting lap bar. Riders, who must be at least tall, are restrained with ratcheting over-the-shoulder restraints.