Patent ID: 7891877
Filing Date: 2011-02-22
Classification: B23Q,F16C

Abstract:
1. A circular arc slide apparatus comprising: a lower plate; an upper plate assembled on the lower plate; and a circular arc track, provided between the lower plate and upper plate, for guiding the upper plate in a circular arc motion within a motion reference plane perpendicular to the lower plate, wherein mutually-insertable guide rail portions are provided in an upper surface of the lower plate and a lower surface of the upper plate, two sets of opposing planar surfaces parallel to the motion reference plane and mutually opposing in a direction orthogonal to the motion reference plane are provided in the guide rail portion of the lower plate and the guide rail portion of the upper plate, circular arc curve-shaped guide grooves which, by virtue of having respectively identical centers of curvature and radii of curvature, constitute the circular arc track are provided in the opposing planar surfaces, cross-sections of the mutually-opposing guide grooves are respectively formed in a circular arc shape defining a portion of a same circle, a plurality of balls of diameter corresponding to the cross-sectional shape of the two guide grooves are rollably fitted between the opposing guide grooves in a preloading state and, furthermore, the lower plate and the upper plate are integrally machined from a plate-like material and formed in a shape comprising the guide rail portions and guide grooves, and an inner surface of each of the guide grooves is configured from a machined surface produced by an end mill.