EP 2110205 B1 20171108 - Method and device for controlling a hydraulically operated power screwdriver
Title (en)
Method and device for controlling a hydraulically operated power screwdriver
Title (de)
Verfahren und Vorrichtung zum Steuern eines hydraulisch betriebenen Kraftschraubers
Title (fr)
Procédé et dispositif de commande d'une visseuse hydraulique
Publication
Application
Priority
DE 102008019765 A 20080418
Abstract (en)
[origin: EP2110205A2] The method involves determining nominal pressure by an electronic evaluation unit (18). A piston-cylinder unit (2) is pressure-loaded to perform a pre-stroke until the nominal pressure is reached and followed by a return stroke. A time interval from the beginning of pressure loading up to the arrival of the nominal or initial pressure after pressure relief, is measured. The pressure loading and measuring steps are repeated. The measured time intervals are compared. Pressure loading cycles are stopped when a last measured time interval is shorter than a penultimate measured time interval. An independent claim is also included for a hydraulically operated power wrench comprising an adjustable pressure valve.
IPC 8 full level
B25B 21/00 (2006.01); B25B 23/145 (2006.01)
CPC (source: EP US)
B25B 21/005 (2013.01 - EP US); B25B 23/145 (2013.01 - EP US); B25B 23/1456 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR
DOCDB simple family (publication)
EP 2110205 A2 20091021; EP 2110205 A3 20160302; EP 2110205 B1 20171108; DE 102008019765 A1 20091022; ES 2656408 T3 20180227; US 2009260485 A1 20091022; US 8056426 B2 20111115
DOCDB simple family (application)
EP 09157357 A 20090406; DE 102008019765 A 20080418; ES 09157357 T 20090406; US 42542309 A 20090417