bellcrank

Definitions

noun A type of crank that changes motion through an angle, typically 90 or 180 degrees.

bell +‎ crank, because of its original use in changing the vertical pull on a rope to a horizontal pull on the striker of a bell.

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To the forward, upper edge of planes (5) connection is made by means of rod (13) to one arm of a bellcrank lever, (14) the latter being pivotally mounted upon a fore and aft pin (15), supported from the main plane; and the other arms of the port and starboard bellcrank levers

Flying Machines: construction and operation; a practical book which shows, in illustrations, working plans and text, how to build and navigate the modern airship Octave Chanute 1871