Guide sleeve, guide post and improved ball bearing assembly

In combination, a guide post having a longitudinal axis and a longitudinal slot substantially throughout its length and having end portions;

• a cylindrical ball bearing cage having a co-axial longitudinal bore adjustably receiving said guide post, and adapted for relative longitudinal and rotary movements thereon;
• said ball bearing cage mounting a plurality of spaced circularly arranged ball bearings extending substantially the length of said cage and projecting inwardly and outwardly thereof, respectively, there being an internal open top annular recess in said cage spaced inwardly of one end thereof, and terminating in a threaded counter bore extending to said one end;
• a truncated roller bearing having opposed hemispherical surfaces and opposed flat sides, guidably positioned within said longitudinal slot with a hemispherical surface maintaining a rolling point contact with the bottom of said slot and said flat sides loosely and slidably registerable with opposed sides of said slot;
• said roller being alternately registerable with opposite end portions of said slot, limiting rectilinear movements of the ball cage relative to said guide post;
• a hemispherical portion of said roller being positioned within the cage annular recess;
• an end cap having a depending shank threaded into said counter bore;
• there being an internal annual open bottom recess upon the end of said shank cooperatively receiving a hemispherical portion of said roller;
• and
• said cage including its recess and cap recess being adapted for rotary sliding movement relative to said roller in a direction at right angles to said axis, said cap trapping said roller within said ball cage.