A linkage in the form of a right-angled lever, with the pivot at the corner Shimano 3-speed hubs (and some Sturmey-Archer 5-speeds) use a bell crank to translate a pull on the gear cable into a push on a loose fitting pushrod that fits into the axle
A lever whose two arms form a right angle, or nearly a right angle, having its fulcrum at the apex of the angle
The pivoted wood, metal, or plastic arm which converts the motion of the control lines to up-and-down movement of the elevators in a control line model aeroplane
The type of steering mechanism most common in R/C cars, trucks and buggies It consists of two posts, one of which has a connection to the steering servo This connection turns one of the steering arms, which is connected with an Ackerman link to a second steering arm The left side steering arm is connected to the left steering knuckle with a turnbuckle, just as the right steering arm is connected to the right steering knuckle Some bellcrank systems allow racers to alter the Ackerman angle, which can tune the steering effect of the steering system in different ways