cleaning shoe

plural cleaning shoes

1. agricultureThe part of a harvester or combine which both sieves out large impurities such as rocks and blows out light impurities such as chaff.

   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.

   2003, William W. Casady, “Grain Harvesting Systems”, in Dennis R. Heldman, editor, Encyclopedia of Agricultural, Food, and Biological Engineering, →ISBN, page 449

2. machineryrail transportA brake shoe used to clean a wheel.

   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.

   1913, Pennsylvania Railroad Test Dept., Brake Tests, page 245