Patent ID: 7600918

Claim:
A linear guidance device, comprising: a raceway rail ( 1 , 5 ) which is formed in a substantially rectangular sectional configuration and provided with a ball rolling groove ( 10 , 50 ) formed in a longitudinal direction on each side surface thereof; and a movement block ( 2 , 6 ) which is formed in a channel configuration in which a base portion ( 20 , 60 ) and a pair of flange portions ( 21 , 61 ) protruding on the base portion are provided so that a guide groove ( 22 , 62 ) is formed, and assembled with respect to the raceway rail ( 1 , 5 ) loosely fitted to the guide groove ( 22 , 62 ) through an intermediation of a large number of balls ( 3 ), and comprising multiple track grooves ( 30 , 70 ) through which the balls ( 3 ) circulate and which are provided with the guide groove ( 22 , 62 ) faced with the raceway rail ( 1 , 5 ), wherein each of the track grooves ( 30 , 70 ) comprises: a load straight-line groove ( 31 , 71 ) which is formed in an inner surface of the flange portions ( 21 , 61 ) while being faced with the ball rolling groove ( 10 , 50 ) of the raceway rail ( 1 , 5 ); a non-load straight-line groove ( 32 , 72 ) which is provided in parallel with the load straight-line groove ( 31 , 71 ) and formed in a concave corner portion of the guide groove ( 22 , 62 ), which is bordered with the flange portions ( 21 , 61 ) and the base portion ( 20 , 60 ) or formed in the base portion ( 20 , 60 ) so as to be faced with the raceway rail ( 1 , 5 ); a ball deflection groove ( 33 , 73 ) which communicatively couples the load straight-line groove ( 31 , 71 ) and the non-load straight-line groove ( 32 , 72 ) to each other so as to allow the balls ( 3 ) to move therebetween.