Method and apparatus for forming multiple thickness bead
US4228121A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Nov 6, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B50/592
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming a double-thickness bead in a flexible sheet stock article, such as a container or lid constructed from paper stock. The method includes holding a central region of the paper stock blank near its perimetral edge between cooperating dies, forming an axially extending flange in the blank between the held region and the edge, capturing the edge against radial movement in a groove provided in a ring movable relative to the dies, and moving the ring relative to the dies to form the double-thickness region in the blank between the held portion and edge. The apparatus includes the cooperating relatively movable dies, the movable ring and cooperating draw pads adjacent the ring. The draw pads are movable relative to the dies and ring and cooperate with the dies and ring to form a void into which the double-thickness region is formed. The configuration of the void controls the formation and configuration of the bead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.