EP 0835220 B1 20010404 - EXTENDIBLE BOOM, PARTICULARLY FOR CRANES
Title (en)
EXTENDIBLE BOOM, PARTICULARLY FOR CRANES
Title (de)
AUSZIEHBARER AUSLEGER, INSBESONDERE FÜR KRÄNE
Title (fr)
FLECHE EXTENSIBLE PARTICULIEREMENT DESTINEE A DES GRUES
Publication
Application
Priority
- SE 9600606 W 19960509
- SE 9502099 A 19950608
Abstract (en)
[origin: WO9641764A1] A double-acting hydraulic unit (1) for telescopic booms comprises a cylinder (2) and a hollow piston rod (4) with a piston (3) that divides the cylinder into a piston side chamber (5) and a piston rod chamber (7). Two main conduits (10, 11) lead to the cylinder and two main conduits (10', 11') lead away from the piston rod to a co-operating hydraulic unit. Within the piston rod (4), there is a displaceable transmission element (16) that is arranged to actuate a locking device which in an active state engages into a seat (19) in a gable portion (8) to the cylinder (2). When the transmission element (16) is in an inner end position, the locking device (17) is inactive, whereby the piston (3) is freely movable relative to the cylinder. When the piston (3) reaches an outer end position at the same time as the actuation of the transmission element (16) by a carrier of an adjacent hydraulic unit terminates, then the transmission element is displaced axially, a wedge body (21) actuating the locking device (17) so that it engages into the seat (19). In this way the piston rod is locked mechanically and automatically in its outer end position.
IPC 1-7
IPC 8 full level
B66C 23/693 (2006.01); B66C 23/70 (2006.01); F15B 11/20 (2006.01)
CPC (source: EP)
B66C 23/705 (2013.01); F15B 11/205 (2013.01)
Designated contracting state (EPC)
AT DE IT
DOCDB simple family (publication)
WO 9641764 A1 19961227; AT E200266 T1 20010415; AU 5709596 A 19970109; DE 69612380 D1 20010510; DE 69612380 T2 20010913; EP 0835220 A1 19980415; EP 0835220 B1 20010404; SE 504463 C2 19970217; SE 9502099 D0 19950608; SE 9502099 L 19961209
DOCDB simple family (application)
SE 9600606 W 19960509; AT 96915286 T 19960509; AU 5709596 A 19960509; DE 69612380 T 19960509; EP 96915286 A 19960509; SE 9502099 A 19950608