EP 2146822 A2 20100127 - POWER SCREWDRIVER
Title (en)
POWER SCREWDRIVER
Title (de)
KRAFTSCHRAUBER
Title (fr)
VISSEUSE ÉLECTRIQUE
Publication
Application
Priority
- DE 2008000671 W 20080423
- DE 102007019409 A 20070423
Abstract (en)
[origin: WO2008128523A2] The invention relates to a power screwdriver (10) comprising a motor (12) as the drive, a desired torque default element (52) and an actual torque determination element (46), a torque gradient determination element (48) and a motor control (40) which controls the motor (12) depending on the torque gradient (dmd_lst/dt). The invention is characterized by a torque threshold determination element (50) which provides a torque threshold value (Md_Lim, Md_Lim1, Md_Lim2) that depends on the torque gradient (dmd_lst/dt) and lies below the desired torque value (Md_Soll). If the actual torque value (md_Ist) exceeds the torque threshold value (Md_Lim, Md_Lim1, Md_Lim2), a motor control (40) presets a speed reduction for the motor (12) or already completely switches off the motor (12). The power screwdriver (10) according to the invention avoids torque overshoots and yet allows the desired torque value (Md_Soll) to be exactly reached in the shortest time possible.
IPC 8 full level
B25B 23/147 (2006.01); B23P 19/06 (2006.01)
CPC (source: EP US)
B25B 23/147 (2013.01 - EP US)
Citation (search report)
See references of WO 2008128523A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
WO 2008128523 A2 20081030; WO 2008128523 A3 20090108; AR 066256 A1 20090805; BR PI0811037 A2 20141209; BR PI0811037 A8 20190115; CA 2684786 A1 20081030; CA 2684786 C 20150407; CL 2008001169 A1 20081003; CN 101765483 A 20100630; CN 101765483 B 20130918; DE 102007019409 B3 20081113; EP 2146822 A2 20100127; EP 2146822 B1 20120801; RU 2009142992 A 20110527; RU 2459695 C2 20120827; TW 200846142 A 20081201; TW I492824 B 20150721; US 2010116519 A1 20100513
DOCDB simple family (application)
DE 2008000671 W 20080423; AR P080101698 A 20080423; BR PI0811037 A 20080423; CA 2684786 A 20080423; CL 2008001169 A 20080423; CN 200880021544 A 20080423; DE 102007019409 A 20070423; EP 08757966 A 20080423; RU 2009142992 A 20080423; TW 97114758 A 20080423; US 45101308 A 20080423