Drill rod with rubber collar

摘要

Drill rods are frequently provided with a so-called rubber collar (9) which consists of one or more rubber or plastic rings (5) which are pulled over the drill rod (1). For the non-slip seating of the rubber collar (9), the drill rods (1) have in the area of the rubber collar (9) recesses (3, 8) and/or protuberances (4, 7) such as annular grooves (3) or raised rings and/or knobs (7). <IMAGE>