Method of casting brake shoes

Abstract

A method of making a brake shoe having a curved table section and at least one rib section disposed on the concave side of the table section, generally including casting the brake shoe in a mold having cope and drag sections so that the axis of curvature of the table section thereof is disposed substantially parallel to the parting plane of the mold sections whereby no draft or parting ridge is formed on the outer curved surface of the table section.

We claim: 
     
       1. A method of casting a brake shoe having an arcuate table section and at least one rib section disposed on the concave side of said table section comprising forming at least one mold cavity and cooperating sprue, runner and riser cavities in the cope and drag sections of a mold assembly, so that the axis of curvature of the mold surface forming the outer surface of the table section of the resultant cast brake shoe is disposed substantially parallel to the parting plane of said cope and drag sections .Iadd.forming said outer surface of said table section entirely in one of said sections as said continuous arcuate surface suitable for mounting a brake lining thereon, .Iaddend.assembling the cope and drag sections of the mold assembly so that said cavities are cooperatively related, pouring molten metal through said sprue and runner into said mold cavities, and removing the cast brake shoe from the mold assembly. 
     
     
       2. A method of casting a brake shoe according to claim 1 including providing all surfaces of said mold cavity disposed substantially perpendicular to said parting plane, with draft. 
     
     
       3. A method of casting a brake shoe according to claim 1 including forming said mold cavity in a sand molding material. 
     
     
       4. A method of casting a brake shoe according to claim 3 including providing all surfaces of said mold cavity disposed substantially perpendicular to said parting plane, with draft. 
     
     
       5. A method of casting a brake shoe according to claim 1 including forming the mold cavity surface for the outer surface of the table section of the resultant cast brake shoe entirely in the mold cavity of one of said cope and drag sections. 
     
     
       6. A method of casting a brake shoe according to claim 5 including providing all surfaces of said mold cavity disposed substantially perpendicular to said parting plane, with draft. 
     
     
       7. A method of casting a brake shoe according to claim 5 including forming said mold cavity in a sand molding material. 
     
     
       8. A method of casting a brake shoe according to claim 7 including providing all upright surfaces of said mold cavity disposed substantially perpendicular to said parting plane, with draft.