Endless linear ball bearing

An endless ball bearing arrangement for relative longitudinal movement between a table having a longitudinal edge portion and a longitudinal side portion alongside said table, one of said portions being movable with respect to the other portion, said arrangement comprising in combination:

• (a) a pair of elongated straight metal block bearing bodies (203, 204) each having a flat top and a flat bottom, said bearing bodies also having a back part, said bearing bodies being located in one of said longitudinal portions facing the opposite longitudinal portions;
• (b) said metal block bearing bodies also having a front part of W-shape cross-section, said W-shape laying on one side, said W-shape having outer arms extending towards said top and bottom parts, a center pointing towards the back and a junction of said outer arms and said center;
• (c) a pair of bearing first races (208, 209), in said bearing bodies (203, 204) extending parallel longitudinally at said junction on both sides of said center, across the length of said bearing bodies, said first races serving as the races for loaded balls, the radius of curvature of the races being only slightly greater than one-half the diameter of balls which are to be loaded therein, said first races being inclined at an angle of about 45.degree. to the horizontal towards said W-shape center, second races for unloaded balls parallel to said first races disposed away from said first races in said bearing bodies;
• (d) a retainer (215) of W-shape sized to fit over the W-shaped front part with parallel slits (218, 219) disposed over the races, the width of the slits being slightly smaller than the diameter of the balls to be used, tongues (235) for scooping up balls (207) formed at opposite ends of the slits;
• (e) end plates (230, 231) with U-shaped turning grooves (232, 233) for guiding balls;
• and,
• (f) race bars (301, 302) with bearing third races (303, 304) corresponding to the first races (208, 209) disposed oppposite the retainer slits (218, 219) in the other of said table portions.