| 摘要 |
PURPOSE: To prevent the inclination and displacement of a rod material by always applying the vertical directional pressure to abutment members by forming a strap with two support points, and setting the radius of rotation of an intermediate support point sufficiently smaller than the radius of rotation of a main support point. CONSTITUTION: A strap S is formed into a shape wound around a spiral and a vertical part 1 so that a half part of a curve of a bar is formed with an intermediate support point 6 by a bottom part of a spiral part 8 and a main support point 10 is positioned near an end of the bar. Both the support points 6, 10 are positioned opposite to each other in relation to the vertical part 1 with a different distance from the vertical part 1 so that the radius of rotation of the intermediate support point 6 is formed sufficiently smaller than the radius of rotation of the main support point 10. With this structure, vertical directional pressure is always applied to the abutment members 16, 17 so as to prevent the generation of inclination of the bar material and pushing thereof by an edge of holes of the abutment members 16, 17. |
