Method for producing a core form to be employed in the molding of a ball joint bearing
US3959872A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1975 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | Apr 28, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49989
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for producing a core form to be employed in the injection molding of a ball joint bearing which has a spherical bearing surface adapted to encircle the ball of a ball joint resiliently and a plurality of isolated oil retention recesses formed in the bearing surface, comprising the steps of forming a spherical portion corresponding to said bearing surface of the bearing on a core form blank, applying a lead layer onto said spherical portion, removing said lead layer from selected areas of said spherical portion which correspond to said oil retention recesses in the bearing surface to expose the areas, applying a hard chrome plating layer at said exposed areas of the spherical portion to form reliefs which are adapted to form said oil retention recesses in the bearing and removing the remaining portion of said lead layer from the spherical portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.