Cover, method of producing cover, and secondary processing die used for producing cover
US11407565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2021 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | Nov 4, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2543/00814
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method of forming an undercut which is engageable with an edge, on a side wall of a cover intermediate body using a cover intermediate body and a secondary processing die. In the secondary processing die, a moving inner core has, on the outer surface thereof, a concave shape corresponding to a convex shape of the inner surface of the undercut. The moving inner core is made up of a plurality of core segments which are arranged along the circumferential direction. Each core segment is vertically movable along an inclined surface of a core. When the moving inner core is moved upward, the moving inner core transforms smaller than the inner diameter of the side wall of a cover. The slide core has, on the inner surface thereof, a convex shape corresponding to the concave shape of the undercut.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.