| 摘要 |
PURPOSE: A safety guard is provided to change volume in the corresponded shape easily at installation, conveyance or storage and to prevent the damage caused by physical external force. CONSTITUTION: The safety guard contains a base unit(2) supported to the bottom, and an expansion unit(4) formed to one side of the base unit(2) to be separable and expanded by a pressure fluid. The expansion unit(4) is provided with a filling part having a space where a pressure fluid flows in and a one-way valve(16) for supplying or discharging a pressure fluid, and the filling part is expanded or constricted upward from the base unit(2) by the inflow or outflow of a pressure fluid.
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