Rifle Shutter Group Axial Translation and Rotation Mechanism
Solution Overview
Problem
Existing rifles with manually movable carriage assemblies for rearming operations often face complexities in the interaction between the carriage assembly and fixed components, leading to potential jamming and difficulty in reliable bullet loading and case discharging.
Innovation Solution
The rifle features a carriage assembly that moves axially between shooting and rearming configurations, with a shutter group undergoing axial translation and rotation, guided by a command pin and cavity system, simplifying interactions and eliminating the need for third-party components to rotate the shutter group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shutter group rotation is achieved through reciprocal interaction between the carriage assembly and fixed components, then the bullet loading and case discharging operations can be performed, but the complexity of interaction increases leading to potential jamming
Solution Approach 1:
The patent extracts the shutter group rotation function from the complex interaction between the carriage assembly and fixed components, consolidating it into a single commanded rotation operation. The command pin and cavity system isolates the rotation mechanism, removing unnecessary intermediate interactions that caused jamming while maintaining the essential bullet loading and case discharging functions.
Solution Approach 2:
The command pin and command cavity system acts as an intermediary mechanism that simplifies the interaction. Instead of direct complex reciprocal interaction between the carriage assembly and fixed components, the commanded rotation through the pin-cavity interface mediates the motion, reducing complexity and eliminating jamming-prone interactions.
2Ease of operation
If multiple components interact to rotate the shutter group, then the shooting mechanism can function, but the risk of jamming increases
Solution Approach 1:
The patent removes the problematic multiple-component interaction for shutter group rotation and replaces it with a single commanded rotation operation. The command pin and cavity system extracts the essential rotation function while eliminating the intermediate components that caused jamming, thereby improving reliability without sacrificing operational ease.
Solution Approach 2:
The shutter group is designed to rotate through a commanded operation that self-regulates its motion. The command pin and cavity system provides automatic guidance and control, reducing the need for complex external interactions and minimizing the risk of jamming while maintaining ease of operation for bullet loading and case discharging.
3Productivity
If the shutter group undergoes complex axial translation and rotation operations, then the rearming operations can be performed, but the difficulty in maintaining defined angular positions increases
Solution Approach 1:
The command pin and command cavity system serves as a precision intermediary that controls the shutter group rotation. This mechanism ensures that the shutter group achieves and maintains defined angular positions with high precision, as the pin-cavity interface provides accurate geometric constraints during the rotation operation, thereby maintaining manufacturing precision while enabling efficient rearming.
Solution Approach 2:
The command pin and cavity system is pre-configured with specific geometric features that guide the shutter group rotation to predetermined angular positions. This preliminary design of the pin-cavity interface ensures that the shutter group automatically achieves the correct angular positions during operation, maintaining precision without requiring complex active control during the rearming process.
Data Source
Figure 1a~1b
Figure 1a'~1b'
Figure 2
AI summary
The invention relates to a rifle (1) comprising a fixed main body (2), comprising a barrel (4), a receiver (6) comprising an upper opening (60) and a breech element (8). The rifle (1) comprises a trigger group (10) at least partially housed in the receiver (6), comprising a trigger (100) and a hammer device (110) operable by the trigger (100) . Furthermore, the rifle (1) comprises a carriage assembly (3), comprising an assembly body (30) and a shutter group (5) at least partially housed in said assembly body (30). Said carriage assembly (3) is positioned on the receiver (6) at the upper opening (60) and is axially movable by the user between an advanced shooting configuration and a retracted rearming configuration, and vice versa. Upon the axial movement of the carriage assembly (3), between the retracted configuration and the advanced configuration, the shutter group (5) is first moved axially on translation and then is moved in roto-translation. The shutter group (5) comprises a central body (50) and a command pin (51) protruding radially from said shutter body (50); the command pin (51) engages the assembly body (30) so that said reciprocal interaction guides the shutter group (5) in rotation.