EP 0241023 B1 19930922 - METHOD FOR CONTROLLING AUTOMATIC CABLE CRANES AND HYDRAULIC CONTROL SYSTEM
Title (en)
METHOD FOR CONTROLLING AUTOMATIC CABLE CRANES AND HYDRAULIC CONTROL SYSTEM
Publication
Application
Priority
AT 91386 A 19860408
Abstract (en)
[origin: EP0241023A2] In known automatic cable cranes it is considered to be a disadvantage that, from the safety point of view, vibratory movements of the load pendulum, which can lead to inadvertent clearing of the automatic cable crane, could not be eased by constructional measures. On the other hand, the hydraulic valve layout is made in such a way that sudden displacements of the valves are normally necessary and two-way valves are used as slide or shuttle valves. The leakage losses which are consequently present, in particular in the zero position, can cause dangerous operating states. To avoid these disadvantages, the invention proposes to design the requisite main valves as separate individual valves with dead-time actuation and, in addition, to provide a delay time or a delay displacement so that undesirable vibratory movements of the load pendulum cannot lead to clearing of the automatic cable crane. <IMAGE>
IPC 1-7
IPC 8 full level
B66C 13/18 (2006.01); B66C 21/00 (2006.01)
CPC (source: EP)
B66C 13/18 (2013.01); B66C 21/00 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0241023 A2 19871014; EP 0241023 A3 19900530; EP 0241023 B1 19930922; AT 389863 B 19900212; AT A91386 A 19890715; AT E94851 T1 19931015; DE 3787486 D1 19931028
DOCDB simple family (application)
EP 87105231 A 19870408; AT 87105231 T 19870408; AT 91386 A 19860408; DE 3787486 T 19870408