Patent ID: 8943671
Filing Date: 2015-02-03
Classification: B05D,B62D,C23C,C25D,Y10T

Abstract:
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.