| 摘要 |
A castor assembly comprises stem (2) which is adapted at the upper end (4) thereof to be connected to the base of a structure to be supported, a foot (5), a castor body (3) swivellably mounted on the stem (2), a castor wheel (12) carried by the castor body, the rotational axis (13) of the castor wheel being offset from the axis of the stem to provide castoring, and a thrust bearing (19) positioned at the upper end of the castor body. The foot (5) is carried by the lower end of the stem (2), which is adjustable threadedly engageable with a threaded bore in the base whereby adjustment of the stem upper end (4) causes the foot to be raised or lowered relative to the base. The castor body (3) is capable of vertical movement relative to the stem (2), and the thrust bearing (20) bears the vertical load acting between the castor body and the base when the foot (5) is lifted clear of the floor and the castor wheel is supporting the structure.
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