Shear molding of reinforced latch
US4108941A · kind A · utility
10Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1977 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Jun 16, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2251/1025
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Containers are formed with latch openings and a reinforced region adjacent to each opening, molded in one operation from a softened sheet of organic polymer material. The latch opening is formed by vertical shearing of the sheet from a predetermined area of one of the mold dies during the closure of the molds. The sheared-off material is compressed against adjacent portions of the sheet to define a reinforced edge of the aperture. Accretion of sheet material adjacent the aperture region adds strength and rigidity to the container wall and eliminates removal of waste material separated during formation of the latch opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.