| 摘要 |
PROBLEM TO BE SOLVED: To provide suspending devices for ceiling suspension bolts which are suited to the mass production of many kinds of bolts appropriate for the kinds of devices and have a high reliability capable of obtaining strengths required for supporting the ceiling suspension bolts. SOLUTION: A main body 1 of a suspension device equipped with internal thread 3 for screwing a suspension bolt B is formed to a barrel shape with a hard resin. And a head 5 projected out at least to the side of both the ends is provided at the upper end portion of the barrel, a plate-shaped or pipe-shaped iron-based metal is used as a raw material for the female thread 3, a collar portion 7 embedded in the head 5 is provided on the upper end portion by press forming, and the main body 1 of the suspending device is made in one united body by the insert formation of the internal thread 3. |
