Hollow track ball and method for manufacturing same
US5652604A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1995 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Sep 14, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24777
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a hollow track ball which includes a first hemispherical shell having a first annular end having thereon a plurality of positioning studs, and a second hemispherical shell having a second annular end having thereon a plurality of positioning holes for respectively engaging with the plurality of positioning studs so as to result in a hollow track ball. A method for manufacturing such a track ball includes steps of a) providing a first hemispherical shell having a first annular end having thereon a plurality of positioning studs, and providing a second hemispherical shell having a second annular end having thereon a plurality of positioning holes, and b) causing the plurality of positioning studs and the plurality of positioning holes to engage with each other so as to result the respective hemispherical shells in the hollow track ball. Such a hollow track ball not only avoids the conventional slant joint seam, but also greatly reduces the reject rate of the products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.