Miniature linear guide apparatus

Claim 1

In a miniature linear guide apparatus of the type comprising: a guide rail extending in a longitudinal direction and having a U-shaped cross section, said guide rail having ball rolling grooves formed, respectively, in the inner surface of the side walls thereof in an opposed relationship; a slider including a race member having an inverted U-shaped cross section and having ball rolling grooves, respectively, formed in the outer surfaces of the side walls thereof, said ball rolling grooves of said guide rail respectively opposing the said ball rolling grooves of said race member, and a ball guide member adapted to be fitted into a U-shaped recess of said race member and having ball circulating paths formed therein, said ball circulating paths being in communication with said ball rolling grooves of said race member and said guide rail member; and a plurality of balls inserted in said ball rolling grooves of said race member and said guide rail, and in said ball circulating paths within said ball guide member; the improvement which comprises: said ball guide member housing said ball circulating paths being formed in a groove form having upwardly directed openings, the ball guide member, including at each end portion corresponding to the longitudinal end portions of said race member protruding portions, the protruding portions protruding laterally and having curved ball grooves respectively, each of said protruding portions protruding towards and close to a corresponding one of said ball rolling grooves of said guide rail and said race member in communication through said curved ball groove, said protruding portions being integrally formed with said ball guide member; said slider is formed by superposing said race member on said ball guide member to cover said openings of said groove-shaped ball circulating paths, and; securing means, including female and male parts, respectively, provided at corresponding positions on said race member and said ball guide member to secure said race member to said ball guide member.