Breech bolt having asymmetric lugs
US9863729B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2014 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | May 16, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4973
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A firearm including a receiver, a barrel, a breech bolt assembly, and a trigger assembly. The bolt assembly has a bolt including a body portion, a lug portion, and a firing pin bore. The lug portion includes outward extending lugs, a cartridge recess, and an off-center hole. The bolt assembly also includes an extractor and an ejector pin. At least some of the lugs on the lug portion of the bolt have a tapering outer surface so that a rearward surface of the respective lug is taller than a forward surface of the respective lug and at least part of each tapered outer surface is taller on one side of a circumferential centerline than on another side of the circumferential centerline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.