| 摘要 |
PROBLEM TO BE SOLVED: To firmly fix a vertical frame and a horizontal frame constituting a door frame without using welding or bolts by forming a slit on the vertical frame, and inserting a projection piece formed on the horizontal frame to drive a fixing nail. SOLUTION: The two points of slits 4 are formed on a vertical frame 1 constituting a door frame, two projection pieces 3 formed on the end of a horizontal frame 2 are inserted, and a fixing nail 6 is driven into a small hole 5 formed in the projection piece 3. The fixing nail 6 has a disk-like head part 6a, when a resin-made elastic ring 7 is fitted to be driven into the small hole 5 of the projection piece 3, the head part 6a of the fixing nail 6 and the edge are abutted on the vertical frame 1 to push the small hole 5 near an intermediate part, the horizontal frame 2 is firmly fixed on the vertical frame 1, and the elastic ring 7 is elastically deformed to prevent the looseness of the fixing nail 6. A notch is formed on the outer periphery of the head part 6a to be bitten by the vertical frame 1 so as to form a non-slip part. Thus, welding or bolts are not used and the vertical frame 1 and the horizontal frame can be fixed firmly.
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