Patent ID: 7144209
Filing Date: 2006-12-05
Classification: B23Q,Y10T

Abstract:
1. A concave slot cover for covering a concave slot formed in a machine tool, the concave slot cover comprising: a top plate for covering the concave slot; and a pair of pressing parts extending from the top plate, the pressing parts having outermost projections that contact side walls of the concave slot after the concave slot cover is installed in the concave slot; wherein base ends of the pressing parts are positioned at the top plate in such a manner that the distance between the base ends is shorter than the distance between the side walls pressed by the pressing parts, and portions of extending parts of the pressing parts, which extend from the base ends, are formed to project outwards until they are spaced at a wider distance therebetween than the distance between the side walls of the concave slot, and wherein a relationship between distance W (between the side walls of the concave slot), distance L (between an outermost projection of one extending part and an outermost projection of the other extending part), and angle θ (formed by a first line linking the base end of one pressing part and the outermost projection of one extending part and a second line linking the base end of the other pressing part and the outermost projection of the other extending part) is represented by the following mathematical expression 1: where W is less than L(W<L); and wherein the concave slot has a thickness that is greater than a distance between the base ends and the outermost projections of the pressing parts of the concave slot cover.