EP 0778100 B1 19981223 - Percussion twist drill
Title (en)
Percussion twist drill
Title (de)
Drehschlag-Wendelbohrer
Title (fr)
Foret héliocoidal de percussion
Publication
Application
Priority
DE 19545647 A 19951207
Abstract (en)
[origin: EP0778100A1] This rotary percussion drill has main spiral grooves (4,5) for cuttings and a hard metal cutter (7,21) attached to a one-piece cutter plate (6). The base (10) of the cutter plate is fixed into a groove (9) passing through the diameter of the shaft (1), in its end face (3). The base of the cutter plate has a central thickening, its cross-section exhibiting a part-circular keying projection (12). The groove cut across the drill shaft has a corresponding recess (13). The base of the cutter plate is centralised by keying.
IPC 1-7
IPC 8 full level
E21B 10/36 (2006.01); B23B 51/02 (2006.01); B25D 17/02 (2006.01); E21B 10/44 (2006.01); E21B 10/58 (2006.01)
CPC (source: EP US)
E21B 10/445 (2013.01 - EP US); E21B 10/58 (2013.01 - EP US); Y10T 408/906 (2015.01 - EP US); Y10T 408/9065 (2015.01 - EP US); Y10T 408/909 (2015.01 - EP US); Y10T 408/9097 (2015.01 - EP US)
Designated contracting state (EPC)
CH DE DK FR GB IT LI SE
DOCDB simple family (publication)
EP 0778100 A1 19970611; EP 0778100 B1 19981223; CN 1081117 C 20020320; CN 1159383 A 19970917; DE 19545647 A1 19970612; DE 59601040 D1 19990204; DK 0778100 T3 19990823; JP 3907757 B2 20070418; JP H09177467 A 19970708; US 5779403 A 19980714
DOCDB simple family (application)
EP 96810630 A 19960925; CN 96121779 A 19961127; DE 19545647 A 19951207; DE 59601040 T 19960925; DK 96810630 T 19960925; JP 32869296 A 19961209; US 76218196 A 19961209