Method and apparatus for making galvanized upper coupler assembly

摘要

A method of making a galvanized upper coupler assembly for use in a trailer and the corresponding upper coupler assembly apparatus is disclosed. The method comprises the steps of providing a frame, covering at least one area of the frame with a mask, galvanizing the portions of the frame that are not covered, removing the mask, providing a kingpin, and attaching the kingpin to the frame. After attachment of the kingpin to the frame, the combined assembly can be coated with a rust resistant coating. if desired, a cover plate can be attached to the frame, over the kingpin.

主权项

1. A method of making a galvanized upper coupler assembly of a trailer for use with a lower coupler assembly of a tractor, the method comprising:
providing a frame including a wall having an upper surface and a lower surface; covering a lower surface area of the lower surface with a mask; galvanizing the frame, the mask preventing the galvanization of the lower surface area which is covered by the mask; removing the mask to expose the lower surface area, the lower surface area being ungalvanized; providing a kingpin; and attaching the kingpin to the wall; wherein the lower surface area comprises an area of contact at the lower surface by the lower coupler assembly when the trailer is attached to the tractor by the kingpin and the lower coupler assembly.