Patent ID: 8398045
Filing Date: 2013-03-19
Classification: B60N,F16C

Abstract:
1. A slide rail device which includes a lower rail having a uniform cross section, an upper rail having a uniform cross section which is freely slidably engaged with said lower rail, and balls which are installed between said lower rail and said upper rail, wherein said balls comprise upper balls and lower balls, wherein said lower balls are inserted between a pair of lower-rail lower-ball contact R-portions formed on said lower-rail and a pair of upper-rail lower-ball contact portions formed on said upper rail, and wherein said upper balls are inserted between a pair of lower-rail upper-ball contact R-portions via formed on said lower-rail and a pair of upper-rail upper-ball contact portions formed on said upper rail, and wherein the following conditions are satisfied: wherein r r R R wherein said lower rail comprises: a lower-rail bottom wall; a pair of lower-rail side walls which extend upward from laterally opposite sides of said lower-rail bottom wall, respectively; and a pair of lower-rail upper walls which extend toward a center of said lower rail in the lateral direction from upper ends of said pair of lower-rail side walls, respectively; wherein said pair of lower-rail lower-ball contact R-portions connect said pair of lower-rail side walls to said lower-rail bottom wall, respectively; and wherein said pair of lower-rail upper-ball contact R-portions connect said pair of lower-rail upper walls to said pair of lower-rail side walls, respectively.