Method of molding a dual plastic shotshell casing
US5021206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Nov 21, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7772
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A dual plastic compression formed shotshell casing includes an injection-molded annular-shaped hard plastic rim and an elongated compression-formed tubular body having an integral basewad portion at its base end which is mechanically interlocked with the rim to define the final basewad of the shotshell casing. In method of making the shotshell casing, the hard plastic rim is first injection molded independently. The tubular body is then formed in a two-step process. In the first step, a plastic preform is injection molded over the rim in mechanically interlocked relation to the rim. In the second step, the tubular body is compression formed from the preform mechanically locked to the rim.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.