| 摘要 |
PURPOSE:To homogenize protection over an entire length of a thread by a method wherein a wall having a uniform thickness of a band ring is formed into a cross-sectional taper over its full length by bending it into a bellows. CONSTITUTION:An outer protector 3A for protecting a taper screw 2A engraved on an end surface of a steel pipe 1 consists of a band ring 4A made of soft material which is to be fit to the taper screw 2A and a metallic clamp band 5A which applies the band ring 4A to the taper screw 2A. A wall 8 made of band-shaped material 6 with a uniform thickness over an entire cross section forming the band ring 4A is made into a taper by bending it like a bellows. Therefore, the entire shape of the band-shaped material is a band ring which has no distortion due to the uniformity of its wall thickness with a taper-like cross section. It also serves as a good quality thread protector which can transmit applications from the clamp band on every portion uniformly.
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