| 摘要 |
PROBLEM TO BE SOLVED: To improve draw-out strength of a nail and joining strength of a face bar and the nail by arranging a smooth part whose surface is flat, between a nail head of a nail barrel part and a tip side of the nail within a thickness of a structure face bar, and arranging a ring part wherein many ring shaped recessed and projection parts are continuously worked on its surface, between the tip side of the nail and the tip part of the nail. SOLUTION: A nail N1 is composed of a nail head 31, a barrel part 32, and a nail tip part 35, the barrel part 32 is formed between the nail head 3 and a nail tip side within a nearly thickness of a floor backing material or an inner wall backing material, and is provided with a smooth part 33 whose surface is a nearly flat surface, and a ring part 34 wherein many ring shaped recessed parts 34a and projection parts 34b are alternately and continuously worked in a nail length direction on its surface, between the nail tip side and the nail tip part 35. The projection part 34b is formed in a taper shaped cross section whose outer diameter is formed gradually small toward the nail tip side, and an outer diameter of the smooth part 33 is formed larger than an outer diameter of the recessed part 34a. Joining strength of the nail N1 and the floor backing material or the inner wall backing material, and draw-out strength of the nail N1 is improved.
|
