Breech locking mechanism
US4213261A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jun 27, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Jun 27, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41A3/40
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A firearm breech locking mechanism which includes a receiver having a longitudinal track guiding an actuating rod in reciprocating motion, and two guide slots for guiding a bolt carrier member mechanically coupled to the operating rod. Two roller receiving slots are also formed in the receiver member. A roller is disposed in these slots. It extends transversely to the direction of motion of the operating rod. A cam surface on the operating rod raises the roller as the operating rod reaches its forwardmost position to thereby lock the bolt relative to the receiver and shell chamber. As the operating rod is moved rearward, a cam surface on the bolt carrier forces the roller to its unlocked position. The invention further includes a latch pivotally secured to the bolt member which cooperates with a recess formed along one of the guide slots. This latch maintains the operating rod and bolt carrier separated from the bolt by a predetermined distance and ensures that the bolt carrier does not fully engage the bolt before the cam surface on the operating rod elevates the roller into its groove in the bolt. In an alternative embodiment, the locking roller elevating cams are disposed on the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.