公开(公告)号：IT8647538D0

公开(公告)日：1986-01-15

申请号：IT4753886

申请日：1986-01-15

Applicant: TAMPELLA OY AB

Inventor： JARMO HEINONEN ,  RISTO WISAKANTO ,  ROLF STROM

IPC: E21B19/08 ,  B23B45/14 ,  B23B47/00 ,  B23Q1/01 ,  B23Q1/30 ,  B25D5/00 ,  F16C29/02 ,  F16C29/12 ,  E21C

公开(公告)号：IT1138496B

公开(公告)日：1986-09-17

申请号：IT2362281

申请日：1981-08-24

Applicant: TAMPELLA OY AB

Inventor： HANNU PAASONEN ,  PEKKA SALMI ,  JARMO HEINONEN

IPC: E21B19/24 ,  F16C29/10 ,  E21C

Abstract: A drill steel centralizer comprising a body having an immovable jaw positioned in stationary relation to the body. A movable jaw and drill steel guide between said jaws that can be opened and closed by means of the movement of the movable jaw. A locking device providing means by which the movable jaw can cause the drill steel guide to be locked and released into the closed and open positions. Thus, the locking device is held in its locked position by an elastic member that is arranged to transmit a force attempting to open the jaw past the elastic member directly to the body.