| 摘要 |
A pair of relatively rotatable face-to-face metal swivel plates centrally secured together adjacent the common center axis and arranged along their respective margins for respective securement to an article and the base. A continuous circular V-shaped bearing race is formed in one metal plate to extend concentrically about the center axis and spaced a substantial distance therefrom. A frictionless plastic bearing material is not only interposed between the metal plates with its opposite sides engaging opposite plates for bearing and spacing purposes but is also curved arcuately to conform to the circular curvature of the race. One side of that material is V-shaped to extend into and conform to the V-shape of said race sufficiently along the length of the race for centering one plate. The opposite side of that same material and the other metal plate mutually cooperate to provide complementary centering means.
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