Plastic cartridge case
US4614157A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1984 |
| Grant date | Sep 30, 1986 |
| Priority date | — |
| Expiry date | Oct 4, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B5/313
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An all-plastic cartridge case is disclosed. The case is all-plastic polyethylene and has a hard-plastic rim and a soft-plastic glass-filled high density polyethylene basewad. The basewad is of a plastic similar to but stronger and tougher than that of the shotshell tube while the rim is of a hard plastic which is chemically dissimilar to the tube. The rim is mechanically locked to the tough basewad and the basewad is chemically bonded to the tube. Also disclosed is a two-step method for molding such a shell with a triple plastic head. Either the rim or the basewad is molded first and the other of the two is molded through the first.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.