Bell crank

from The Collaborative International Dictionary of English v.0.48

Bell crank \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.
   [1913 Webster]