to be mounted transversely or longitudinally within the vehicle. Bicycles Bellcranks are used in some internally geared hub assemblies to select the gearing. The motion from a Bowden cable is translated by a bellcrank to a pushrod which selects which portion of the epicyclic gears are driven by the bicycle's rear sprocket. Residential flats Bellcrank mechanisms were installed at the top of entryway stairs in multi-unit Victorian and Edwardian homes (circa 1890 to 1930), particularly in the San Francisco Bay Area to allow residents to open and close the doors remotely so they would not need to walk down the stairs to welcome guests. References External links daerospace.com. Mechanical engineering Linkages (mechanical)