Coating apparatus – Projection or spray type – Work-supported and guided carriage
Patent
1997-12-24
1999-09-14
Simmons, David A.
Coating apparatus
Projection or spray type
Work-supported and guided carriage
118317, 118DIG10, B05B 1306
Patent
active
059517611
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a device for applying an internal coating in tubes according to the preamble of the appended independent claims.
Such devices may be used for internally coating all types of tubes or pipes, wherein such devices for internally coating water pipes will hereafter be discussed for illuminating the invention but not in any way for limitation thereof. "Water pipes" is defined as comprising all types of tubes or pipes that conduct water, also waste water and discharge pipes, larger main pipes in the soil as well as pipes in the heating, water and sanitation system of accommodations. The condition of pipes of this type is impaired with age, and for instance rust in tubes of cast iron tends to create holes in the walls thereof at some exposed locations, which may lead to leakage having sometimes severe consequences, such as costly moisture damages in buildings, leakage of substances being harmful to the environment into the soil and so on. Also tubes of plastic are changed over a period of time and fissures therein may arise as a consequence of ageing. There is therefore a need to recondition such pipes after a certain period of time through an internal coating thereof by a protecting layer, so that holes or fissures in the pipes resulting in damages of the environment will never appear. A series of devices of this type are therefor known, which have any form of slide or carriage that is usually pulled through a tube to be reconditioned while spraying coating material onto the inner wall of the tube through a nozzle arranged at the slide or the carriage.
Such a device is known through for example EP-A1-0 094 819. However, this and other devices of this type already known have a severe disadvantage in not enabling internal coating of tubes having a limited cross-section, such as different water pipes in buildings, but they are intended for coating larger tubes or pipes, such as discharge main pipes leading to purifying plants and the like. The reason for this is that the arrangement which is adapted to make the nozzle rotate for throwing the coating material towards the inner wall of the tubes in question has so important dimensions, that it is impossible to bring such an arrangement with a nozzle arranged thereon through tubes having small diameters, especially waste pipe tubes and tubes having smaller dimensions in the heating, water and sanitation system of buildings. However, it is pointed out that the invention is not in any way restricted to coating of tubes having small cross-section dimensions. The arrangement used may drive the nozzle to rotation through utilizing compressed air or an electric motor.
In some cases the very design of the nozzle, which may not be too small for allowing an acceptably rapid operation of the device, set a limit for how thin tubes may be for being coated, by the tendency of such a nozzle to hit the inner wall of the tube in question with an outer edge thereof when moving through bends of the pipe, which implies a risk of leaving any point of the inner wall uncoated, so that it may not be completely relied upon a reconditioning of the tube in question being good enough.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device solving the problem mentioned above of already known devices of the type mentioned above.
This object is according to the invention obtained by providing such a device with an arrangement comprising driving means adapted to be arranged outside the tube to be coated and to drive an elongated flexible member to rotate, the end of said member being rigidly connected to the nozzle for rotation thereof. Thus, by utilizing an elongated flexible member for rotating the nozzle the means driving the nozzle to rotate, such as a suitable electrical motor or the like, may be arranged outside the tube in question and will therefor not act limiting upon how thin the tubes which may be coated by the device may be. A device of this type may therefore without any problems be c
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Padgett Calvin
Simmons David A.
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