EP 1270494 A1 20030102 - Extension device for telescopic booms of hydraulic cranes
Title (en)
Extension device for telescopic booms of hydraulic cranes
Title (de)
Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans
Title (fr)
Dispositif pour l'extension du mât télescopique d'une grue hydraulique
Publication
Application
Priority
IT TO20010586 A 20010618
Abstract (en)
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. <IMAGE>
IPC 1-7
IPC 8 full level
B66C 23/693 (2006.01); B66C 23/70 (2006.01); F15B 11/20 (2006.01); F15B 15/14 (2006.01); F15B 15/16 (2006.01)
CPC (source: EP)
B66C 23/54 (2013.01); B66C 23/705 (2013.01); F15B 11/205 (2013.01); F15B 15/1457 (2013.01); F15B 15/149 (2013.01)
Citation (search report)
- [X] WO 9641764 A1 19961227 - HIAB AB [SE], et al
- [DA] IT 1233225 B 19920320 - FASSI GRU IDRAULICHE S P A [IT]
- [A] US 5518129 A 19960521 - SIEBERER FRANZ [AT]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 02013063 A 20020613; IT TO20010586 A 20010618