| 摘要 |
PROBLEM TO BE SOLVED: To prevent the disengagement between core bars due to earth and sand clogged into the teeth bottom of a sprocket. SOLUTION: The core bar 3 includes: a pair of wing sections 3c; an engaging section 3b to be engaged with the sprocket; and a pair of guide protrusions 3a protruded from the upper surface side of the wing sections 3c on both sides of the engaging section 3b. In the core bar 3, tension load sections 4a and 4b protruded to one side in the core bar width direction are formed on both sides of the engaging section 3b, and a disengagement preventing protrusion 6a is formed at a position lying outside both the sides of the extension load section, and not overlapping in the vertical relationship with respect to the extension load section formed in other core bar 3 when the tension load sections formed in adjacent other core bars 3 are connected to each other. The disengagement preventing protrusion is formed to be overlapped with parts of the adjacent other core bars 3 in the vertical relationship with a gap interposed therebetween, when viewed from side. COPYRIGHT: (C)2011,JPO&INPIT |
