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.
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4.15.1.2 Dead ends shall not be permitted.
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4.15.1.3 All surfaces should be corrosion-resistant or shall have
a protective coating. Paint shall not be used.
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4.15.1.4 Axle bolt ends
should be flush, and shall not extend more than 21⁄2 exposed
threads beyond the retaining nut.
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4.15.1.5 Washers shall not be used between the horn and the axle
retaining nut.
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4.15.1.6 All structural members shall have a minimum of horizontal
flat surfaces.
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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.
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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.
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4.15.1.9 A clearance
of not less than 1⁄4 inch (6mm) shall
be provided between the horn assembly and the rollingsurface of
wheels 4 inches (100mm) and smaller. A clearance of 1⁄2 inch
(12mm) shall be provided between these same surfaces on casters
with wheels larger than 4 inches (100mm) for cleaning.
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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.
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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.
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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.
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4.15.1.13 Kingpin assemblies, which have the nuts or rivets at
the bottom, shall have suitable caps covering the ends.
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4.15.1.14 Axles shall be so constructed that cotter pins or castellated
nuts are not used.
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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 1⁄4 inch (6mm).
Caster wheels shall have solid webs.
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4.15.1.16 Brakes and locking devices when attached to caster assemblies
or wheels shall comply with the requirements of Section 3.2.
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