EP 0368811 A1 19900516 - A reset device for hydraulic load control systems.
Title (en)
A reset device for hydraulic load control systems.
Title (de)
Rückstellgerät für hydraulische Laststeuerungsanlagen.
Title (fr)
Dispositif de réinitialisation pour systèmes hydrauliques de contrÔle de la charge.
Publication
Application
Priority
- IT 4016588 A 19881109
- IT 4016688 A 19881109
Abstract (en)
The device is intended in particular for cranes provided with hydraulic load control systems piloted by a pressure signal proportional to the overturning moment generated by the load, which produce control signals that block any movement of the crane likely to increase the load; use is made of a three-position bleed-off valve (12) which, in a non-stable position assumed momentarily as the spool shifts back and forth between two stable positions, brings about a reduction in the pilot pressure directed into the control system (10) so as to avoid lock-up of the crane that can occur in certain maximum load conditions. A valve (12) of this type also achieves a significant reduction of the hysteresis that traditionally delays the return of such systems (10) to the passive state.
IPC 1-7
IPC 8 full level
B66C 23/90 (2006.01)
CPC (source: EP)
B66C 23/90 (2013.01)
Citation (search report)
[A] GB 2078197 A 19820106 - HIAB FOCO AB
Designated contracting state (EPC)
AT DE ES FR GB IT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 89830308 A 19890704