发明公开
EP1270494A1 Extension device for telescopic booms of hydraulic cranes
审中-公开
Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans
- 专利标题： Extension device for telescopic booms of hydraulic cranes
- 专利标题（中）： Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans
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申请号： EP02013063.9申请日： 2002-06-13
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公开(公告)号： EP1270494A1公开(公告)日： 2003-01-02
- 发明人: Signori, Roberto , Guidorossi, Achille , Ceresoli, Rossano
- 申请人： FASSI GRU IDRAULICHE S.p.A.
- 申请人地址： Via Dei Carmelitani 2 I-24021 Albino (Bergamo) IT
- 专利权人： FASSI GRU IDRAULICHE S.p.A.
- 当前专利权人： FASSI GRU IDRAULICHE S.p.A.
- 当前专利权人地址： Via Dei Carmelitani 2 I-24021 Albino (Bergamo) IT
- 代理机构： Spandonari, Carlo, Dr. Ing.
- 优先权： ITTO20010586 20010618
- 主分类号： B66C23/693
- IPC分类号： B66C23/693 ; F15B15/14 ; F15B11/20
摘要：
The boom (7) of a truck-mounted crane comprises several telescopically slidable sections which are extended and collapsed by hydraulic jacks (13). Pressurized fluid is supplied to the jacks through extension and collapse transfer conduits (14, 15) bored or received inside the rods (18) of the jacks. The extension transfer conduits (14) are intercepted by valves (19) located on the heads of the jack pistons and mechanically operated by the bottoms of the cylinders of the jacks through tappets (21). The collapse transfer conduits (15) are provided with draining means comprising respective offtakes (17a) controlled by switches (24) that are mechanically operated by fingers (25) on the rods of the upstream-adjacent jacks, respectively.
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