cleaning shoe

cleaning shoe (plural cleaning shoes)

1. (agriculture) The part of a harvester or combine which both sieves out large impurities such as rocks and blows out light impurities such as chaff
   • 2003, William W. Casady, “Grain Harvesting Systems”, in Dennis R. Heldman, editor, Encyclopedia of Agricultural, Food, and Biological Engineering‎, →ISBN, page 449:

     The cleaning shoe expels lightweight material known as chaff as well as material with intermediate aerodynamic properties, such as straw, from the back of the combine.

2. (rail transport, machinery) A brake shoe used to clean a wheel
   • 1913, Pennsylvania Railroad Test Dept., Brake Tests‎, page 245:

     After every test (except those at 30 mph) the wheel was cleaned by making two stops with cleaning shoes from a speed of 40 miles per hour.

• (parts of a cleaning shoe): chaffer, sieve, blower