Flexible hose

一种柔性软管，在沿合成树脂制管壁(15)的内周面形成螺旋状的凹槽(18)内，形成有用于粘接或熔接增强线的凸起(21)。收容在凹槽(18)内的增强线(20)被粘接或熔接在凸起(21)的前端面上，并与凹槽(18)之间确保着微小间隙(30)。这样，可将管壁(15)的凹槽(18)与增强线(20)的粘接或熔接部分的范围减小且均匀化，这种柔性软管，是在管壁的凹槽内设置增强线的软管，可将其凹槽与增强线的粘接或熔接部分的范围减小且均匀化，并易弯曲且柔软性好。 PURPOSE: To provide a flexible hose which is easy to turn and flexible by miniaturizing and homogenizing the range of sticking or fusing part of a recess groove and a reinforcement line in spite of being a hose obtained by providing the reinforcing line in the recess groove of a pipe wall. CONSTITUTION: In the recess groove(18) formed spirally along the inner peripheral surface of a synthetic resin pipe wall(15), a protrusion(21) for sticking or fusing the reinforcing line(20) is formed. The reinforcing line(20) housed in the recess groove(18) is stuck or fused to the end face of the protrusion(21) to secure a fine gap(30) between the reinforcing line and the recess groove(18). Thus, the range of sticking or fusing part of the recess groove(18) of the pipe wall(15) and the reinforcement line(20) is miniaturized and uniformed.