Topic Normal position it is possible the stepping foil for the chair to high speed and stability to do.SolutionsThe boss to be provided on the center of the stepping foil for the chair, the normal position groove which corresponds to the rib which is provided on the outside of the sleeve which is in the support tube to be provided in the insertion hole of the aforementioned boss, the cavity which the aforementioned sleeve arranges vertically to correspond to the male spiral step which is provided on the outside of the boss, in addition, the perforation hole which is penetrated to diameter direction to be established in the aforementioned male spiral step, the pin to pass through the aforementioned perforation hole, at the same time projection to be provided in sublevel of aforementioned pin, the elastic element and the housing other than the aforementioned pin to insert from the edge and you to be packed, one end of the aforementioned housingThe aforementioned male spiral step and the spiral shellfish the female spiral step which sticks is provided, other than the aforementioned pin in the edge structure of the stepping foil for the chair which features that the steering wheel is provided. Selective figure Figure 2
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