CORE CATCHER Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: core catcher has body 1 with paired ports 2, toggles 3 and shafts 4. Two neighboring ports 2 have parallel walls 5. Provided between each pair of ports 2 with parallel walls 5 is connector 6 with nonparallel walls. Connector has hole 8 square to body radius which divides connector in halves. Toggle has hole 9 coaxial to hole 8. Inserted in holes 8 and 9 is shaft 4. Paired ports are made for one operation by gang mill two mills equalling width of port 2 and spacer between them with width equalling width of connector. Toggle 3 is introduced into ports 2 from inner side of body 1, shaft is installed in holes 8 and 9 and fastened there. EFFECT: higher efficiency. 2 cl, 4 dwg