PURPOSE: To smoothly insert an engaging metal fittings, by fastening a lock nut and by connecting a horizontal reinforcement and a bracket to each other integrally, after the male screw of the horizontal reinforcement is screwed into a coupler on the bracket side.
CONSTITUTION: A bracket 1 is of a cylindrical unit having a continuous slit 11: on the peripheral surface of the bracket 1 which is the projected surface of connecting a horizontal reinforcement 2, a fitting plane 12 is formed. After that, coupler 3 is integrally connected to the fitting plane 12, and the male thread 21 is cut at the end section of the horizontal reinforcement 2 for projecting connection, After the male screw 21 of the horizontal reinforcement 2 is screwed into the coupler 3 on the bracket 1 side, a lock nut 4 is fastened and the horizontal reinforcement 2 and the bracket 1 are integrally connected to each other. As a result, the bracket and the slit can be exactly prevented from being deformed.
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