| 摘要 |
A rollercarriage having a carriage bottom below which a plurality of wheels (3, 5) is mounted, at least one of the wheels being mounted swingably about a substantially vertical swivel axis (7) which does not intersect the axis for the rotation of the wheel. The roller carriage is moreover provided with retention means to retain the at least one swingably mounted wheel (5) on an overlying roller carriage. The retention means comprise a support face (8) which supports the swingably mounted wheel at a support point (18), an outer engagement area (16) extending at least partly about the swivel axis (7), and an inner engagement area (16) positioned between the swivel axis (7) and the outer engagement are (16), said outer and inner engagement areas restricting the rolling movement of the at least one swingably mounted wheel (5) on an overlying roller carriage. At least one of the engagement areas is provided with at least one projection capable of engaging the swingably mounted wheel (5) on an overlying roller carriage, so that the rotation of the swingably mounted wheel about the support point (18) on the support face (8) is essentially prevented. |
