EP 0080446 A3 19850123 - METHOD OF CONTROLLING AN IMPACT MOTOR AND AN IMPACT MOTOR
Title (en)
METHOD OF CONTROLLING AN IMPACT MOTOR AND AN IMPACT MOTOR
Publication
Application
Priority
SE 8106907 A 19811120
Abstract (en)
[origin: EP0080446A2] In a rock drill, the feed force is transmitted from the housing 11 of the rock drill to the drill stem or drill stem adapter 14 via damping piston 17. The damping piston 17 rebounces by the reflected compressive shock waves and the rebounce is sensed and used to control a control pin 48 which adjusts the stroke length of the hammer piston 13 so that the reflected shock wave energy is minimized.
IPC 1-7
IPC 8 full level
B25D 9/12 (2006.01); B25D 9/14 (2006.01); B25D 9/26 (2006.01); B25D 17/24 (2006.01)
CPC (source: EP US)
B25D 9/12 (2013.01 - EP); B25D 9/145 (2013.01 - EP); B25D 9/26 (2013.01 - EP); B25D 17/245 (2013.01 - EP); E21B 1/38 (2020.05 - EP US)
Citation (search report)
- [Y] EP 0035005 A1 19810902 - ATLAS COPCO AB [SE]
- [Y] FR 2304449 A1 19761015 - ATLAS COPCO AB [SE]
- [Y] DE 2654200 A1 19770623 - MONTABERT ROGER
Designated contracting state (EPC)
AT CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0080446 A2 19830601; EP 0080446 A3 19850123; JP S5890476 A 19830530; SE 8106907 L 19830521
DOCDB simple family (application)
EP 82850229 A 19821112; JP 20219682 A 19821119; SE 8106907 A 19811120