EP 0201724 B1 19900627 - REPLACEABLE CONVEYING SPIRAL FOR A DRILL BIT
Title (en)
REPLACEABLE CONVEYING SPIRAL FOR A DRILL BIT
Publication
Application
Priority
DE 3517560 A 19850515
Abstract (en)
[origin: US4699226A] An interchangeable conveying spiral which can be removably, slidably mounted on a drill shaft for conveying drillings away from a drill head mounted on the end of the spiral. The spiral includes an elongated strip having at least first and second substantially orthogonal webs. The first web has a free, squared-off end. The strip is wound in a spiral with the free, squared-off end of one turn abuting the free, squared-off end of an adjoining turn of the spiral so that the first web forms a closed jacket tube which can be removably, slidably mounted on a drill shaft, and the second web serves exclusively as a transporting shoulder for conveying drillings.
IPC 1-7
IPC 8 full level
B21C 37/26 (2006.01); E21B 17/22 (2006.01)
CPC (source: EP US)
B21C 37/26 (2013.01 - EP US); E21B 17/22 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0201724 A2 19861120; EP 0201724 A3 19870930; EP 0201724 B1 19900627; DE 3517560 A1 19861120; DE 3672294 D1 19900802; US 4699226 A 19871013
DOCDB simple family (application)
EP 86104843 A 19860409; DE 3517560 A 19850515; DE 3672294 T 19860409; US 86224386 A 19860512