Thermoplastic molded part with stress reducing juncture
US4430370A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1981 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | May 5, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24777
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved thermoplastic molded part is disclosed including a stress reducing juncture which is operative to reduce the differential shrinkage of the molded plastic, which would otherwise develop due to the uneven cooling of the plastic to room temperature, thereby inhibiting the warping of the part. More specifically, an improved thermoplastic molded part is provided including at least one wall member formed unitary with another structural element such as another wall, flange or boss area. The thermoplastic part is further provided with a stress reducing juncture, defined by an elongated trough-like recess, located in the wall member adjacent the other structural element. Preferably, the recess has a width approximately equal to the width of the wall member and a depth equal to approximately one half that width. The recess functions to decrease internal stresses that normally develop due to differential shrinkage of the molded plastic during cooling to room temperature. By reducing internal stresses, the unwanted warping of the part is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.