| 摘要 |
PURPOSE:To simplify the structure of a stopper device as well as eliminate of the failure of the engagement of its coupling portion by providing two or more vertically movable stoppers fitly inserted into the vertical shaft of a base in such a way that its projected tip portion is coupled with the toothed portion of a leg rack in horizontal turning manner from the side. CONSTITUTION:The projected tip portions 3a and 4a of vertically movable stoppers 3 and 4 fitly inserted into a vertical shaft 2 are turned horizontally and coupled with the toothed portion of a leg rack D. Then, a spacer 8 with a U-shaped notch to be fitted with the shaft is put in a given number between wedges 5-7, and the stoppers 3 and 4 are clamped and fixed to the position to be fitted into the toothed portion of the leg rack D by advancing the threaded shafts of the wedges 5-7. |
