Patent ID: 8646742
Filing Date: 2014-02-11
Classification: B60N

Abstract:
1. A seat rail device wherein an upper rail for supporting a seat is provided on a lower rail, rolling bodies are provided between the lower and upper rails, and the upper rail is movable along the lower rail via the rolling bodies, wherein the lower rail includes, with respect to a cross-section perpendicular to the longitudinal direction of the lower rail, a lower bottom wall section that forms a rail bottom, a lower wall section that extends upward from an outer edge of the lower bottom wall section, a lower top plate section that extends from an upper edge of the lower wall section toward an inner side above the lower bottom wall section, and a lower downwardly extending section that extends downward from an edge of the lower top plate section, wherein the upper rail includes, with respect to a cross-section perpendicular to the longitudinal direction of the upper rail, an upper upright wall section that includes a seat supporting portion formed at an upper portion thereof, an upper bottom wall section that extends toward an outer side from a lower edge of the upper upright wall section, an upper wall section that extends upward from an edge of the upper bottom wall section, and an upper sloped wall section that extends obliquely upward from an upper edge of the upper wall section, wherein the upper rail is provided above the lower rail so that the upper bottom wall section is positioned above the lower bottom wall section and the upper sloped wall section is positioned in a lower groove having a lower opening surrounded by the lower wall section, the lower top plate section, and the lower downwardly extending section, wherein an inter-bottom-wall rolling body is provided between the upper and lower bottom wall sections and is rollably supported so as to support the upper bottom wall section above the lower bottom wall section, an upper ball-shaped rolling body is provided and rollably supported in an upper in-groove space partitioned and defined by the upper sloped wall section in the lower groove, and a lower ball-shaped rolling body is provided and rollably supported in a lower in-groove space so that the upper sloped wall section is supported from both sides in the lower groove, wherein the upper sloped wall section, which extends obliquely upward from the upper edge of the upper wall section, extends in a direction toward the lower downwardly extending section and away from the lower wall section, and wherein the upper in-groove space is defined as a space surrounded by the lower wall section, the lower top plate section, and the upper sloped wall section, and the lower groove space is defined as a space surrounded by the lower downwardly extending section and the upper sloped wall section.