| 摘要 |
<p>Pivot bushing (10) for casters and in which the stem for associating the caster with an article it is to support, is mounted. The bushing preferably is nonmetallic and fits into the caster stem mount (13) with a close fit for at least a portion of its depth with a clearance fit in the lower area where the stem must pass beyond an annular shoulder (26) in the bushing for retention. The bushing has a fully closed lower end (11) for retaining grease used to lubricate the stem for rotation in the bushing. The upper end of the bushing includes an integral cap-like enclosure, or shroud (17), which overlies the top end of the tube (13) for mounting the bushing and stem in a caster and which lends a finished appearance in this area. A vertical exterior bead (18) on one side of the bushing serves to engage a seam (19) in the mounting tube to position the bushing properly relative to the caster.</p> |
