Patent ID: 8403371

Claim:
Sprinkler unwinding piping, comprising: a flexible pipe; and a rotary nipple fitted externally onto a front-end part of the flexible pipe, wherein the rotary nipple is provided with a taper external thread narrowing forward in a front-end external-circumference part of the rotary nipple, a first ridge portion at the foremost end of the flexible pipe and a second ridge portion adjacent thereto are pressed into first and second enlarged-diameter ridge portions respectively each having an external diameter larger than the internal diameter of the rotary nipple and smaller than the front-end root diameter of the taper external thread of the rotary nipple, the back surface of the second enlarged-diameter ridge portion is brought into contact with the front-end surface of the rotary nipple, a first root portion and a second root portion of the flexible pipe are located in the region thereof covered with the rotary nipple, and between each of the first and second root portions and the internal-circumference part of the rotary nipple, a rubber seal ring is fitted so as to seal the gap therebetween, and a third root portion of the flexible pipe is located on the front-end side thereof from the first root portion and a fourth root portion of the flexible pipe is located on the back side thereof from the second root portion, and an aligning ring is fitted into each of the third root portion and the fourth root portion.