| 摘要 |
The present invention relates to a support bar of the ceiling from the floor of the building which supports the position of the support bar embedded in masonry walls to provide a fastening surface of the fixed side of the terminal box for multiple couplings for rectangular slits formed in the fixed plate, a pair of supporting pieces of which each side of the fixed plate is spaced from the wall so that the support bar is vertically supporting the fixing groove are provided. The support piece to protrude forward from the center to achieve a spring force semicircular spiral located between the outer peripheral surface parts is formed on the side and screwed into the side of the helix combined together with the nipping pieces by ball screw which fastens the support piece when a separation or inserted between the strongly held support bars to give a tightening force consisting of nine screws or disable means for fastening is also presented in the invention. |
