A kind of guardrail with what bed,Including one have it is upper,The fixed frame of lower hinged unit,One have it is upper,The adjustable shelf and a spanner of lower docking unit,Upper hinged unit have a pipe portion,One sets the placing part of what pipe portion inner edge and one sets in what pipe portion and set the elastic component of what placing part,Lower hinged unit have one be equipped with one first flank of tooth pedestal and one by the first flank of tooth stretching mandrel,Upper docking unit is installed with or is arranged the pipe portion of hinged unit on what,And have a top directly or indirectly pushed against for elastic component,Lower docking unit has in a set of pipe portion for covering first flank of tooth of what and a fixed what pipe portion and for the ring gear that mandrel passes through,Ring gear have one can with second flank of tooth of the first flank engagement,Spanner system is spirally connected with mandrel； Thereby,The guardrail can it is upper for user,It opens when leaving the bed and is used as handrail.一種用於床之護欄，包括一有上、下樞接單元之固定架、一有上、下對接單元之活動架及一扳手，上樞接單元有一管部、一設於管部內緣之承置部及一設於管部中且置於承置部之彈性件，下樞接單元有一設有一第一齒面之基座及一由第一齒面伸出之心軸，上對接單元容設或套設於上樞接單元的管部，且有一供彈性件直接或間接推抵之抵頂部，下對接單元有一套覆於第一齒面之管部及一固設於管部內且供心軸穿過之齒環，齒環有一可與第一齒面嚙合之第二齒面，扳手係與心軸螺接；藉此，該護欄能供使用者上、下床時開啟並作為扶手使用。
