Injection molded plastic boss design
US5413833A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24182
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A webbed boss is integrally formed on and projects outwardly from the nominal surface of a wall portion of an injection molded plastic part and has a specially designed cross-section along its length that increases the strength of the boss, in both bending and twisting modes, without increasing the tendency of creating a sink mark on the cosmetic side surface of the wall portion beneath the boss. Representatively, along its length the boss has a generally cross-shaped cross section defined by four webs that meet, at inner cross-sectional ends thereof, at a square junction area of the boss. Each boss has an outer side edge portion with a thickness at the nominal wall side surface of about 60% of the wall portion thickness. From such outer side edge portion, the opposite sides of each of the bosses taper inwardly to the junction area in a manner such that the maximum thickness of the junction area parallel to the nominal side surface is about 60% of the wall portion thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.