JUNK BASKET Russian patent published in 1994 - IPC

FIELD: prevention of drill string sticking. SUBSTANCE: junk basket has stem with subs in upper and lower parts and forming together with chamber stem the casing with holes in upper part. Located in chamber are balls for breakage of sludge. Installed between lower end of casing and supporting end surface of bit thread is shell to interact the shell end with casing end. During assembly, the shell and casing are compressed between the ends of upper sub and supporting end surface of bit thread to stretch the stem. To fully disassemble the junk basket it is enough to undo one thread. EFFECT: higher efficiency. 3 dwg