| 摘要 |
PROBLEM TO BE SOLVED: To assemble a reinforcing material 14 which can prevent the buckling of beam materials 11 and 13 to perpendicular corners between the rear-side beam material 13 and right and left beam materials 11 which frame and form a cab 5 of a hydraulic excavator 1. SOLUTION: The reinforcing material is constituted by integrating first and second stiffening plates 15 and 16 which abut on the beam materials 11 and 13 via surfaces, and a right-angled triangle-shaped supporting plate 17 which is interposed between the stiffening plates 15 and 16. Extended surfaces 15a and 16a which are extended along a side direction with respect to apexes 17b and 17d of the supporting plate 17 are formed on the stiffening plates 15 and 16, respectively. Thus, a load acting on an apex portion is dispersed and borne in a surface-abutting state. COPYRIGHT: (C)2011,JPO&INPIT
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