| 摘要 |
A stable floor fitness apparatus that provides for variable step heights, consisting of an upper foot board and at least one base component, the upper foot board being provided at the ends of the long sides with arc-shaped recessed supporting surfaces, which form a positively fitting supporter unit with the contact surfaces of the base components, wherein the arc-shaped supporting surface is configured as a segment of an arc of the contact surface which is of the same radius as the radius of the supporting surface of the base component but with a shorter arc length L than the arc length L' of the base component and in that the radius of the arc-shaped recessed supporting surface of the upper foot board fits positively and securely in the particular uppermost base component at almost any inclination that is achieved by a plurality of base components in that the radius as well as its mid-point describes an arc about the outermost contact point at any inclination, and wherein the complete arc length L of the arc-shaped supporting surface of the foot board is retained on the contact surface of the base component in that at the radius point there is only one lowest point of the long side of the arc-shaped bearing surface which is separated from the supporting shoulder of the base component at any inclination and a raised section above the supporting surfaces of the base component exists as axial security between the base component and the foot board this being separated from the face side of the base component and lying behind the long sides of the foot board within and beneath this.
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