APPARATUS FOR APPLYING LIQUID ONTO INNER SURFACE OF CYLINDRICAL ARTICLES Russian patent published in 2002 - IPC

FIELD: processes and equipment for applying thin layers of different liquids and other fluid materials onto inner surface of cylindrical products such as tubes. SUBSTANCE: apparatus includes feed union; successively attached to said union: calibrating and elastic restricting members defining cavity communicated with inner duct of feed union through openings provided between zones of securing members. Elastic member is in the form of hose whose free end adjoins to calibrating member. The last is rigid one, for example it is made of metal in the form of drift whose apex is secured to lower portion of feed union. Centering rollers mounted on outer surface of feed union are inclined relative to symmetry axis of apparatus by angle equal to 120 degrees. EFFECT: possibility for controlling thickness of coating, for eliminating contact of working organs with coated surface, simplified design of apparatus. 2 dwg