Polymer cartridge with enhanced snapfit metal insert and thickness ratios
US11448491B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2019 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Jul 26, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B5/307
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A cartridge has a polymer case with a mouth, a neck having a neck thickness (Tn), a shoulder, and a body having a case thickness (Tc). The body has a flat portion comprising a minimum thickness, a pull thickness (Tp), and a dip comprising a dip thickness (Tb). The cartridge also includes an insert attached to the polymer case opposite the shoulder. The insert can a bulge engaging the dip to maintain the insert on the polymer case. Tb and Tn are related by 1.0≤Tb/Tn≤1.5 or just <1.5. The ratio of the minimum thickness of the body to the neck thickness is between about 1.0 and about 1.5. The ratio of Tb to Tn includes, and/or the minimum thickness of the body to the neck thickness includes, but is not limited to, ratios of 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, and 1.50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.