Patent ID: 7980763

Claim:
A motion guide device, comprising: a raceway member in which ball rolling grooves are formed; a moving member formed with load ball rolling grooves facing said ball rolling grooves and having no-load ball return paths each connecting a first end and a second end of each of said load ball rolling grooves, said moving member including a scoop section; and a plurality of balls which are arranged in load ball rolling paths each defined between said ball rolling groove of said raceway member and said load ball rolling groove of said moving member and in said no-load ball return paths, wherein said scoop section aids in scooping the balls rolling in said ball rolling grooves of said raceway member for introduction into said no-load ball return paths, wherein a tip of said scoop section has a cross-sectional shape formed into a shape of a Gothic arch groove for two-point contact with the ball, wherein in a cross-section perpendicular to a traveling direction of the balls, a contact angle made between a line connecting a point where said tip of said scoop section contacts the ball to a center of the ball and a line connecting the center of the ball to a bottom of the Gothic arch groove of said tip of said scoop section is more than 30°, and wherein said contact angle is equal to or less than an angle made between a line connecting the center of the ball that rolls in said ball rolling grooves of said raceway member to an edge of said ball rolling groove in said raceway member and the line connecting the center of the ball to a bottom of said ball rolling groove in said raceway member.