Method of making railway truck bolsters

  • US 5,954,114 A
  • Filed: 04/10/1998
  • Issued: 09/21/1999
  • Est. Priority Date: 01/08/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. In a method of making a hollow cast metal bolster for use in a railway truck, the bolster having first and second outboard ends, a plurality of walls having interior and exterior surfaces, the walls defining a first pair of friction shoe pockets inboard of the first outboard end and a second pair of friction shoe pockets inboard of the second outboard end, the bolster having a central transverse plane between the first and second pairs of friction shoe pockets, the bolster walls including a top wall, a bottom wall and two side walls spaced from each other and connecting the top wall and bottom wall, the method comprising the steps of providing a mold, the mold having a cavity including first and second outboard ends and a center area between the first and second outboard ends, the method further comprising the steps of providing a plurality of cores to define the hollow interior of the bolster, placing the cores in the mold, pouring molten metal in the mold to cast the bolster, removing the cast bolster from the mold, and separating the cast bolster from the cores, the improvement wherein the cores include:

  • a one-piece center core having a core body having a surface for defining at least a part of the interior surface of the top wall inboard of the friction shoe pockets and on both sides of the central transverse plane of the bolster, a surface for defining at least a part of the interior surface of one side wall inboard of the friction shoe pockets and on both sides of the central transverse plane of the bolster, a surface for defining at least a part of the interior surface of the opposite side wall inboard of the friction shoe pockets and on both sides of the central transverse plane of the bolster, and a surface for defining at least a part of the bottom wall inboard of the friction shoe pockets and on both sides of the central transverse plane of the bolster.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×