EP 0820530 B1 20010516 - Screwdriver or screwdriver bit
Title (en)
Screwdriver or screwdriver bit
Title (de)
Schraubendreher oder Schraubendrehereinsatz
Title (fr)
Tournevis ou embout de tournevis
Publication
Application
Priority
- DE 19513366 A 19950408
- EP 9601226 W 19960321
Abstract (en)
[origin: DE19513366A1] The invention concerns a screwdriver, screwdriver bit or similar device with a tip having radially disposed shaped-section engagement surfaces produced preferably by machining or forming, the surface layer forming the working surface being harder than the core of the tip. So that the tool suffers less wear, there is an intermediate layer between the hard surface layer and the core. In this intermediate layer, the hardness decreases with depth from the surface to the core. The intermediate layer is between 0.05 and 0.2 mm thick and the hardness gradient is 1500 to 3000 HV/mm.
IPC 1-7
IPC 8 full level
B25B 15/00 (2006.01); C21D 1/06 (2006.01); C21D 6/00 (2006.01); C21D 9/00 (2006.01); C23C 8/38 (2006.01)
CPC (source: EP US)
B25B 15/001 (2013.01 - EP US); C21D 6/001 (2013.01 - EP US); C21D 9/0068 (2013.01 - EP US); C23C 8/38 (2013.01 - EP US); C21D 2221/10 (2013.01 - EP US); Y10S 81/90 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 19513366 A1 19961010; AU 5272796 A 19961030; DE 59606915 D1 20010621; EP 0820530 A1 19980128; EP 0820530 B1 20010516; US 5953969 A 19990921; WO 9632508 A1 19961017
DOCDB simple family (application)
DE 19513366 A 19950408; AU 5272796 A 19960321; DE 59606915 T 19960321; EP 9601226 W 19960321; EP 96909106 A 19960321; US 91383497 A 19970912