| 摘要 |
The present invention includes multiple protruding arm units with a rotating hole unit, which is located in one side of a cover block and has one side exposed to the inside of a through hole unit formed in the center of the cover block and the other side exposed to the outside of the cover block so as to pass through from one side to the other side; a pressure groove unit, which is formed on the other side of other cover block in order for multiple cover blocks to be connected and which the protruding arm units of other cover blocks are inserted in; a rotating rod, which is inserted into the rotating hole unit to be rotated and has a curved part on the outer end and a manipulation groove unit on the internal end; a restriction unit, which includes a coupling groove unit formed in the pressure groove unit so that the curving unit can be inserted; and a separation preventing unit for preventing the curved part from being discharged from the coupling groove unit. |
