Method of molding an improved linkage lever
US5112551A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Sep 7, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/0046
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of molding a flipper link to reduce or eliminate the tendency of the flipper link to break. The method includes the steps of forming a mold cavity for forming a flipper link having a first end portion, a second end portion and an intermediate necked-down portion. The necked-down portion provides an area between the first and second end portions which more easily twists and absorbs the stress exerted on the flipper link during use. Pins are provided in the cavity for forming an aperture in each of the first and second end portions. Plastic material is injected into the cavity at each end of the first and second end portions such that the plastic material flows into the cavity about the pins and the knit line or lines are formed in the flipper link in a location substantially centrally of the necked-down portion to thereby transfer the stress on the flipper link away from the apertures so as to substantially eliminate the tendency of the flipper link to break about the apertures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.