Patent ID: 9739545
Date: 2017-08-22
CPC Classifications: B05D,F28F,Y10T

Claim:
1. A mechanical member provided with at least a support plate and one or more tubular elements attached in through manner to said support plate, in which an external surface of said support plate is coated with a first layer of plastic material, and in which at least a terminal portion of the internal surface of each of said tubular elements, in substantial correspondence with the support plate, is coated with a multi-layer coating which comprises a plurality of layers of plastic material disposed in sequence one on top of the other, each of said layers being deposited partly in correspondence with said terminal portion of the internal surface of the relative tubular element and partly in correspondence with the surface of said first layer of the external surface of said support plate, wherein a first layer of said layers is disposed on the internal surface of each of said tubular elements in a more external position radially with respect to a longitudinal axis of the tubular element and at least a second layer of said layers is disposed internal radially with respect to the axis on said first layer, in which said first layer extends inside said tubular element substantially parallel to said axis for a first length which is from about one to about two times the nominal diameter of said tubular element and said second layer extends inside said tubular element substantially parallel to said axis for a second length which is greater than said first length by a segment which is from about one to about two times the nominal diameter of said tubular element, so as to define a first internal diameter, less than said nominal diameter and substantially constant for the first length of said first layer and at least a second internal diameter, less than said nominal diameter and greater than said first diameter, substantially constant for the segment of the second length beyond which the second layer extends with respect to the first layer.