| 摘要 |
This invention relates to casing for rollers or bolts for use in sliding door fittings. Such casings may be in the form of a major segment of a circle with the bounding chord located along the edge of the sliding door. In order to fit these casings without screws the outer sidewall has previously been made with elastically deformable toothing, but this itself has led to difficulties in removing the casing. In order to make the casing capable of revolution through 90 DEG and still have a clearance between the bounding chord and the edge of the aperture in the door edge, the bounding chord is made shorter than the side of the inscribed square to the circle, i.e., the height of the arc of the segmental casing is not more than 86 percent of the diameter of the circle.
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