DEVICE FOR PERFORMING MOTION INSIDE PIPE LINE Russian patent published in 2001 - IPC

FIELD: transportation technique; device for motion of control instruments inside pipe lines. SUBSTANCE: device includes cylindrical housing made from ferromagnetic material, cylindrical inertial mass made from non-magnetic material, flexible member secured on housing and made in form of flexible elastic cylindrical envelope with rigid ends; this envelope is charged with air obtaining barrel-shaped form whose one end is secured to end of housing and other end is secured to end of inertial mass; device is also provided with electromagnet located outside pipe line and provided with core in form of permanent magnet. EFFECT: simplified construction; low power requirements. 2 dwg