Internal pipe coating apparatus
US4092950A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1977 |
| Grant date | Jun 6, 1978 |
| Priority date | — |
| Expiry date | Jun 20, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An internal pipe coating apparatus for coating the interior surface of uncoated weld joints in an otherwise internally coated pipeline comprising a frame having wheels at the forward and rear ends thereof, the forward end being oriented or directed towards the uncoated weld joint to be coated, and a drive motor for driving one pair of wheels to move the coating apparatus towards and beyond the uncoated weld joint. A feeler mechanism is located at the rear end of the apparatus. Means are provided to elevate the feeler mechanism into contacting position against the internal surface of the pipe when the drive motor is actuated to move the apparatus in a forward direction. The feeler mechanism comprises a pair of electrically conductive arms adapted to bear against the internal surface of the pipe and to create a completed circuit through the pipe when the feeler arms engage the bare surface of the uncoated weld joint to stop the drive motor. A rotating hollow shaft is also located at the rear end of the coating apparatus. This hollow rotating shaft is provided with a hollow hub and a plurality of hollow radiating arms adapted to spray powder on the uncoated weld joint, which has been …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.