PURPOSE: To prevent looseness of a thread by engraving a thread part in an internal peripheral surface to fix a female thread member to a wall surface, engraving a male thread part in a peripheral surface to provide a male thread member, in which a contact surface with a mounted body is formed in the point end, and also providing a screw rod by inserting it from a mounted body side to bring both mating thread ridges into press contact.
CONSTITUTION: A mounted body 4 is formed of a base 11 and a base cover 12 and stopped to a male thread member 6 by providing a hook part 23 in an upper end edge of a mounting step part 15. A female thread member 3 is formed as a bottomed cylindrical body to engrave a thread part 2 in the internal peripheral surface and fixedly screwed to a bolt anchor 19 whose thread hole is buried in a wall surface 1. A thread part 21, screwed to the thread part 2, is engraved by swelling a thread ridge from a peripheral surface to its point end in the male thread member 6, and an insertion hole 22 for inserting a screw rod 7 is drilled in the center by providing a flange part 16, in which a contact surface 5 with the base 11 is formed in the point end part. In this way, height from the wall surface 1 of the mounted body 4 can be easily adjusted.
KATO MASAO
ASAKURA TORU
