| 摘要 |
PROBLEM TO BE SOLVED: To provide an upper support mechanism for sliding door capable of smoothly opening and closing a slide door without clattering. SOLUTION: This sliding door device for construction machinery comprises upper and lower guide rollers at upper and lower edge parts and is slidably set in an interior doorway. The upper guide roller has a first rolling roller 16b-1 having substantially vertical rolling shaft and a second rolling roller 16b-2 having a substantially horizontal rolling shaft, and the second rolling roller 16b-2 is arranged so as to be supported by an upper guide part 19 and rolled. According to such a structure, the weight of the sliding door is almost supported by an upper guide rail part 19, and hence, a smooth opening and closing operation can be realized. When the first rolling roller 16b-1 is nipped and guided from both sides by a part of the upper guide rail part 19, the clattering in opening and closing operation or traveling can be eliminated.
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