초록 ▼

An improved plastic knuckle pin for a coupler on a railway car and a method of making the improved plastic knuckle pin whereby the improved plastic knuckle pin has a substantially uniform material matrix and the method of making the pin increases uniformity in the material by increasing the surface

An improved plastic knuckle pin for a coupler on a railway car and a method of making the improved plastic knuckle pin whereby the improved plastic knuckle pin has a substantially uniform material matrix and the method of making the pin increases uniformity in the material by increasing the surface cooling area which decreases air and moisture pockets in the material during the molding process.

대표청구항 ▼

[ The invention is hereby claimed as follows:] [1.] A method of making a plastic knuckle pin for a coupler on a railway car, wherein the pin includes a shaft with fluting along its length to increase the surface area of the pin and a head at one end, said method comprising the steps of(a) melting a

[ The invention is hereby claimed as follows:] [1.] A method of making a plastic knuckle pin for a coupler on a railway car, wherein the pin includes a shaft with fluting along its length to increase the surface area of the pin and a head at one end, said method comprising the steps of(a) melting a suitable plastic raw material;(b) injecting said melted plastic material into a mold;(c) forming a knuckle pin having fluting from said plastic material in said mold;(d) removing said knuckle pin from said mold;(e) placing said knuckle pin in a hot water bath;(f) removing said knuckle pin from said hot water bath and allowing said knuckle pin to be cooled therein;(g) allowing said knuckle pin to be cooled in air, wherein said fluting increases the surface area of the pin being cooled to enhance cooling, thereby reducing stresses and resulting in a plastic knuckle pin having a substantially uniform matrix.