| 摘要 |
In combination, a guide post having a longitudinal slot and a ball bearing cage adjustably receiving the post and adapted for relative longitudinal and rotary movements, there being an internal annular recess in said cage inwardly of one end. A truncated roller bearing with opposed hemispherical surfaces and opposed flat sides is guidably positioned within the slot with the roller bearing maintaining a rolling point contact with the bottom wall of the slot and with the roller flat sides loosely and slidably registerable with the side walls of the slot. One of the hemispherical surfaces of the bearing being positioned and retained within an internal annular recess within the ball cage. A fastener within the profile of the guide post adjacent one end of the longitudinal slot traps the roller within the longitudinal slot and ball cage.
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