Method of making injection-molded slide fastener sliders
US4790973A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/034
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of making an injection-molded slide fastener slider includes a first injection-molding step for forming a slider body having an integral arch-shaped support lug and a second injection-molding step for forming a pull tab threaded through a transverse hole in the support lug. For pivotal connection of the pull tab with the support lug, a mold used for achieving the method includes a combination of a main slide core and an auxiliary slide core slidably associated therewith. In the first injection-molding step, the auxiliary slide core is held in a first position in which the two slide cores jointly have a shape corresponding to the shape of the transverse hole while blocking fluid communication between first and second mold cavities in which the slider body and a body of the pull tab are formed respectively. Then the auxiliary slide core is moved to a second position in which a third mold cavity corresponding in shape to a pintle of the pull tab and communicating with the second mold cavity is defined between the slide cores and the underside of the already molded lug. Thereafter, the second injection-molding step is carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.