| 摘要 |
PURPOSE: To maximize an operation valid area of a gut and to enlarge a sweet spot by arranging two pipes symmetrically to a gut surface so as to make the length of a gut through part be shortest, opening a gut hole at the connection part of the pipes and defining a gut hanging part. CONSTITUTION: In a frame longitudinal cross-section drawing (a) for the frame 1, the two pipes are connected at the gut hanging part 5, a part near the gut hole is planar, the gut hole is arranged closest to the outer peripheral edge side of the frame and the gut surface gets into the frame 1. The drawing (b) is a cross-sectional drawing for which the same frame 1 is cut along the gut surface at a center in a longitudinal direction. A reinforcing bridge 4 is provided so as to strongly connect the pipes on the right and left in the center of the gut hanging part 5. In such a manner, the cross-section of the gut hanging part viewing from the side of the gut surface is freely constituted so as to satisfy strength, however, the gut hole is limited to one and is shortest. Thus, by the size of the frame 1 for which the size of a frame body is limited, the valid operation area of the gut is maximized. |
