| 摘要 |
A monocoque structure using a stressed structural skin of sheet metal or other sheet material as the primary structure of a skating device, either self powered or motorised, or of a scooter, either self powered or motorised, the skin consisting very broadly of a bottom surface, with its dimension that is parallel to the direction of the skating device's or scooter's travel, in other words its length, greater than its dimension at right angles to this, in other words its width, a top surface, slightly shorter in length but of the same width, two side surfaces, two vertical end surfaces, two sloping end surfaces and a narrow raised central section, wherein the heights of the two side surfaces are forty percent or more of the width of the top and bottom surfaces and wherein the heights of the two vertical end surfaces together with the two sloping end surfaces and the height of the raised central section are seventy seven percent or more of the width of the top and bottom surfaces and with one or a plurality of pressed strengthening folds of an oval shape F, which is basically an elliptical shape, pressed into the sheet metal or other sheet material of the skin, and wherein when in the planar surfaces, that is surfaces of or relating to, in the form of, a plane, are there to prevent bending from an original and required flat plane and when in the curved surfaces are there to prevent an adverse increase in the degree of curvature bringing about a collapsing of the top surface towards the bottom surface, the pressed strengthening folds bringing about an increase in the overall strength of the skin but more importantly holding the skin correctly in station for maximum load bearing, the particular forming method of the folds eliminating the need for either stretching or shrinking of the sheet metal or other sheet material and producing an effective equivalent of a double curvature in the portion of skin contained within the bounds of the ovals without such stretching or shrinking. (61) Addition to 534817
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