Furnace tubes, flue, or chimney cleaning device - has resiliently expandable member attached to reciprocatingly driven rod and engaging tube inner walls

摘要

The propelling device is for a moving body inside a tubular member. The device comprises a driving body imparting a linear reciprocating movement to a mobile rod relative to the driving body. The rod and the driving body are each connected to at least one resiliently expandable member which engages the inner wall of the tubular member and slides or abuts against the wall according to the direction of the force to which the expandible member is subjected.