| 摘要 |
PROBLEM TO BE SOLVED: To eliminate deficiencies in the safety in the work that a guide roller is moved inward to interfere with a hydraulic cylinder and that a cross member is an obstacle in the visual field from an operator's seat in an existing device which prevents a guide bar from warping by inserting reinforcing cross members above and below the guide bar because the section of a rail is U-shaped and the inside of the guide roller is opened when an arm clamps a load and the guide bar is warped with the clamp force of the hydraulic cylinder. SOLUTION: In the guide bar warping preventive device of a bail clamp, the section of the rail 1 constituting the clamp base is C-shaped, and the guide roller 2 attached to the guide bar 3 is surrounded by the rail 1 from four directions: front, rear, above and below.
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