4  SPECIFIC PRINCIPLES TO COVER EXCEPTIONS AND ADDITIONS TO THE DESIGN, CONSTRUCTION AND CLEANING OF ALL BAKERY EQUIPMENT, AS DEFINED IN SECTION 3.

4.15  DESIGN REQUIREMENTS FOR CASTER ASSEMBLIES AND WHEELS

4.15.1 Specific Design Requirements

4.15.1.1 A caster assembly shall not be used in the product zone.

4.15.1.2 Dead ends shall not be permitted.

4.15.1.3 All surfaces should be corrosion-resistant or shall have a protective coating. Paint shall not be used.

4.15.1.4 Axle bolt ends should be flush, and shall not extend more than 2½ exposed threads beyond the retaining nut.

4.15.1.5 Washers shall not be used between the horn and the axle retaining nut.

4.15.1.6 All structural members shall have a minimum of horizontal flat surfaces.

4.15.1.7 Lubrication reservoirs shall be sealed and the seals shall be protected against rupture during lubrication by the use of relief fittings or other effective means. The seal should be located as close to an outer surface as possible.

4.15.1.8 A clearance of not less than 3/16 inch (5mm) shall be provided between the horn assembly and the maximum width of the vertical surfaces of the wheel of all casters having wheel diameters of 4 inches (100mm) or less. A clearance of not less than 3/8 inch (10mm) shall be provided between these same surfaces of casters with wheels larger than 4 inches (100mm) for cleaning.

4.15.1.9 A clearance of not less than ¼ inch (6mm) shall be provided between the horn assembly and the rolling surface of wheels 4 inches (100mm) and smaller. A clearance of ½ inch (12mm) shall be provided between these same surfaces on casters with wheels larger than 4 inches (100mm) for cleaning.

4.15.1.10 The plate mounting shall be constructed to have a flat top surface. The angle between the top surface and the edge of the plate shall be 90 degrees or less.

4.15.1.11 Mounting holes and other devices provided for installation shall be so designed as to prevent the formation of pockets or areas difficult to clean.

4.15.1.12 The horn assembly or fork shall be constructed so that the surface facing the wheel shall have no concave surface except that part joining the horn plate.

4.15.1.13 Kingpin assemblies, which have the nuts or rivets at the bottom, shall have suitable caps covering the ends.

4.15.1.14 Axles shall be so constructed that cotter pins or castellated nuts are not used.

4.15.1.15 Caster wheels should be constructed so as to have no concave surfaces facing the horn assembly except that part which joins the hub. The included angles between all vertical and horizontal surfaces shall have a radius of not less than ¼ inch (6mm). Caster wheels shall have solid webs.

4.15.1.16 Brakes and locking devices when attached to caster assemblies or wheels shall comply with the requirements of Section 3.2.