Method and apparatus for coating the inner surface of long tubes

Details Method and apparatus for coating the inner surface of long tubes Method and apparatus for coating the inner surface of long tubes

1981-03-23

1983-01-11

Beck, Shrive P.

Coating processes

Interior of hollow article coating

Spraying

427233, 427421, 118306, 118DIG10, 222571, 239106, B05D 102

Patent

active

043682197

ABSTRACT:
A method and apparatus for coating a long tube of small diameter by means of inserting a supplying hose of double structure, with a spray nozzle ahead and two separately extending inner and outer hoses for supplying paint and compressed air respectively therethrough, into the long tube from one end opening thereof toward the other end opening thereof, and retracting the spray nozzle, when it has reached the destination, while spraying the paint at a predetermined speed. The inner hose for the paint is made of flexible material as an elastic hose for being compressive in the diametrical direction under the pressure from the compressed air in the outer hose and again restorable to the original shape when the pressure is released. This supplying hose can be fed out from and wound up on a drum of a winding up mechanism regularly and automatically, with the aid of a pinching roller mechanism which moves the supplying hose forwardly and backwardly by the rotating force of a pair of pinching rollers under some pressure for preventing the slackening of the same when it is moved in either direction.

REFERENCES:
patent: 2074935 (1937-03-01), Potthoff
patent: 2501779 (1950-03-01), Loudenback et al.
patent: 3085549 (1963-04-01), Kacsuta
patent: 3606862 (1971-09-01), Huff et al.
patent: 4272021 (1981-06-01), Standal

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