Patent ID: 6902369

Claim:
An elevating mechanism comprising: a guide member arranged along a vertical direction; a fixed surface arranged in parallel with said guide member; an elevating body guided so as to rise and fall along said guide member; a braking mechanism pivotally supported by said elevating body in a vertical plane, said braking mechanism being in a position apart from said fixed surface under a normal condition of said braking mechanism and being rotated in a direction approaching said fixed surface from an underside of said elevating body when said elevating body falls, whereby said braking mechanism is engaged with said fixed surface to brake said elevating body; said braking mechanism including: a shaft for rotating said braking mechanism; a braking member arranged so as to project from said shaft radially outward, said braking member, at a time of said elevating body falling down, being rotationally forced between said shaft and said fixed surface thereby to press said fixed surface; and a suspension member connecting part arranged across said shaft; urging means for urging said braking mechanism to rotate in the direction approaching said fixed surface from an underside of said elevating body; a suspension member connected to said suspension member connecting part of said braking mechanism, for suspending said elevating body through an intermediary of said braking mechanism, said suspension member, owing to its tensile strength to suspend said elevating body, also rotationally urging said braking mechanism in a direction to separate said braking mechanism from said fixed surface in opposition to rotating force due to said urging unit; and a stopper including: a stopper member fixed to said braking mechanism, said stopper member radially extending from said shaft and having a stopper surface arranged at an end portion thereof so as to face said elevating body; and an abutment member protruded towards said stopper surface from a surface of said elevating body said abutment member having an abutment surface facing said stopper surface; whereby, said stopper stops the rotation of said braking mechanism due to the tensile strength of said suspension member by engaging said abutment surface with said stopper surface of said stopper member; whereby, when the suspension member is cut off, the braking mechanism to which urging force due to the tensile strength of the suspension member is not applied any longer is rotated against the fixed surface by said urging means, so that said elevating body can be braked from falling.