A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
EXPANDABLE LADDER, EXPANDABLE LADDER MANUFACTURING METHOD, AND UNDERGROUND WORK SUPPORT SYSTEM
To provide an expandable ladder which can reduce its weight.SOLUTION: An expandable ladder has a support rod 2 and a cross rail 6. The support rod 2 has an external cylindrical body 4 and an internal cylindrical body 5 connected to both ends of the external cylindrical body 4. The internal cylindrical body 5 can be housed in the external cylindrical body 4 in a nested fashion. The expandable latter has the plurality of internal cylindrical bodies 5 each having different thickness. The internal cylindrical bodies 5 are connected so that the thickness is gradually reduced toward the end and becomes the narrowest at a tip end. The external cylindrical body 4 has a hinge portion 4a which allows the external cylindrical body 4 to be folded. The support rod 2 is formed of magnesium alloy.SELECTED DRAWING: Figure 1
【課題】軽量化を図ることができる伸縮梯子の提供。【解決手段】支柱２と、横桟６とを備え、支柱２が、外筒体４と、外筒体４の両端にそれぞれ接続された内筒体５とを備え、内筒体５が、外筒体４内に入れ子状に収容可能とされている。また、互いに太さの異なる複数の内筒体５を備えており、内筒体５同士が、端部に向かうにつれて徐々に細くなり、先端が最も細くなるようにして接続されている。また、外筒体４に、外筒体４を折り畳み可能とするヒンジ部４ａが設けられている。また、支柱２がマグネシウム合金からなる。【選択図】図１
EXPANDABLE LADDER, EXPANDABLE LADDER MANUFACTURING METHOD, AND UNDERGROUND WORK SUPPORT SYSTEM
To provide an expandable ladder which can reduce its weight.SOLUTION: An expandable ladder has a support rod 2 and a cross rail 6. The support rod 2 has an external cylindrical body 4 and an internal cylindrical body 5 connected to both ends of the external cylindrical body 4. The internal cylindrical body 5 can be housed in the external cylindrical body 4 in a nested fashion. The expandable latter has the plurality of internal cylindrical bodies 5 each having different thickness. The internal cylindrical bodies 5 are connected so that the thickness is gradually reduced toward the end and becomes the narrowest at a tip end. The external cylindrical body 4 has a hinge portion 4a which allows the external cylindrical body 4 to be folded. The support rod 2 is formed of magnesium alloy.SELECTED DRAWING: Figure 1
【課題】軽量化を図ることができる伸縮梯子の提供。【解決手段】支柱２と、横桟６とを備え、支柱２が、外筒体４と、外筒体４の両端にそれぞれ接続された内筒体５とを備え、内筒体５が、外筒体４内に入れ子状に収容可能とされている。また、互いに太さの異なる複数の内筒体５を備えており、内筒体５同士が、端部に向かうにつれて徐々に細くなり、先端が最も細くなるようにして接続されている。また、外筒体４に、外筒体４を折り畳み可能とするヒンジ部４ａが設けられている。また、支柱２がマグネシウム合金からなる。【選択図】図１
EXPANDABLE LADDER, EXPANDABLE LADDER MANUFACTURING METHOD, AND UNDERGROUND WORK SUPPORT SYSTEM
伸縮梯子、伸縮梯子の製造方法、地下作業支援システム
TERAMOTO TAKASHI (author) / MATSUI SHIGETOMO (author) / HIRAKAWA TAKERU (author) / AKAMATSU TAKEHITO (author) / IKEDA JUNJI (author) / KUMAOKA TETSUYA (author)
2020-12-03
Patent
Electronic Resource
Japanese