Definitions for "Bell crank"
A lever whose two arms form a right angle, or nearly a right angle, having its fulcrum at the apex of the angle. It is used in bell pulls and in changing the direction of bell wires at angles of rooms, etc., and also in machinery.
A pair of cranks, free to rotate on the same spindle, with the crank arms secured approximately at right angles to each other.
a lever with two or more arms placed at an angle diverging from a given pivot point, by means of which the direction of motion of a mechanism is changed