Patent ID: 7229212

Claim:
A ball linear guide having ball circulation paths formed on both sides opposed to slide surfaces of a rail, the ball circulation paths being each formed by a loaded ball groove, an unloaded ball hole, and direction changing U-shaped passages which connect the loaded ball groove and the unloaded ball hole with each other, said ball linear guide comprising: a metallic component comprising a metallic flat plate base, the metallic flat plate base being formed by erecting thereon a pair of plate portions and connecting the pair of plate portions integrally with each other through a first flat plate portion, the pair of plate portions being respectively formed with dovetail grooves which respectively constitute loaded ball grooves substantially throughout the overall lengths of side faces opposed to the slide surfaces; a first synthetic resin component disposed so as to cover the flat plate base in an inserted state of the pair of plate portions into the first synthetic resin component, the first synthetic resin component having one sides which, on the first flat plate portion side in the loaded ball grooves, connect to a third flat plate portion positioned on a front side of the first flat plate portion to form slits, also having a pair of unloaded ball holes formed on the side opposite to the side where the dovetail grooves of the plate portions are formed, and further having grooves for forming direction changing U-shaped passages which connect the loaded ball grooves and the unloaded ball holes with each other at both ends; and a pair of second synthetic resin components mounted on the first synthetic resin component and closing the unloaded ball holes and the direction changing U-shaped passages formed in the first synthetic resin component, the pair of second synthetic resin components having other sides for forming the slits; wherein the dislodgment of balls from the loaded ball grooves is prevented by the one sides which form the slits in the first synthetic resin component and the other sides which form the slits in the second synthetic resin components.