| 摘要 |
This invention relates to a catwalk which is installed along the side of upper swing structure of construction machine such as large hydraulic excavator. When the upper structure swings at construction work, the end of longer side of the catwalk is susceptible to damage by hitting with materials like piled mud near the machine. The object of this invention is to provide a catwalk which prevents the damage effectively, and has stable walkway. According to the invention, the catwalk (16) has an outer tilt up portion (18) and an inner tilt up portion (19) at most outer end (H) from swing center (X). The outer tilt up portion (18) is installed around first axis (Yl) near the side (6a), and has outer walkway (Fl) above the axis (Yl) and outer from the side (6a), and is installed to rotate between horizontal and upper positions. The inner tilt up portion (19) is installed around second axis (Y2) above the first axis (Yl), and has inner walkway (F2) on the same plain with outer walkway (Fl), and is installed to rotate between horizontal and upper positions with the push up movement of the outer tilt up portion (18). When the outer tilt up portion (18) hits with materials like piled mud (S), it rotates upward (Z2) with the inner tilt up portion (19) and prevents damages of the catwalk. |
