Semi-Automatic Rifle Sliding Guide Composite Head
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Solution Overview
Problem
Semi-automatic rifles experience malfunctions due to violent shock rebound from the shock absorber, leading to issues in cartridge feeding and locking, particularly when firing the last cartridge, resulting in inefficient recocking and ejection processes.
Innovation Solution
The use of a gas intake recock device with a piston in a gas cylinder connected to the barrel, combined with a floating mass and a return spring made of flat wire, where the head of the sliding guide is partially made of technical thermoplastic material, reduces weight and improves shock absorption, allowing smoother movements and reduced weight distribution, enhancing the recocking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moving parts are made heavy to reduce rebound from the shock absorber, then the reliability improves, but the weight of the rifle increases and movement smoothness deteriorates
Solution Approach 1:
The patent applies composite materials by combining a metal head (providing strength and shock absorption) with a plastic body (reducing weight). Specifically, the head of the sliding guide is made of metal while the body is made of plastic, creating a composite component that optimizes both reliability and weight reduction.
2Stress or pressure
If the head of the sliding guide is made of heavy material to absorb shock, then the shock absorbing capacity improves, but the weight distribution becomes unbalanced and movement smoothness deteriorates
Solution Approach 1:
The head of the sliding guide is made of metal to provide shock absorbing capacity, while the body is made of lightweight plastic. This composite construction maintains adequate shock absorption at the contact point while reducing overall weight for smoother movement.
Solution Approach 2:
The patent applies local quality by making only the head (the part that contacts the piston and absorbs shock) of heavy metal material, while the rest of the sliding guide body is made of lightweight plastic. This localized heavy material placement provides shock absorption where needed without compromising overall movement smoothness.
3Reliability
If the floating mass is made heavier to maintain open position, then the reliability of ejection improves, but the weight of moving parts increases affecting balance
Solution Approach 1:
The sliding guide uses composite materials with a metal head for shock absorption and a plastic body for weight reduction, optimizing the balance between reliability and weight of moving parts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the reliability and efficiency of the semi-automatic rifle by minimizing weight, reducing the risk of spring breakage, and ensuring consistent recocking and ejection processes, while maintaining a favorable weight distribution for smoother operation.
Implementation Method 1
recovery of part of the gases, emitted as a result of the explosion of the cartridge powder, by the opening between the barrel and the gas cylinder, before the bullet of said cartridge has left the barrel, in other words high-pressure gases
Implementation Method 2
When the gases get into contact with the piston, they produce a shock effect which thrusts the moving parts to the rear
Implementation Method 3
the return spring pushes all the moving parts to the front of the rifle again
Implementation Method 4
Due to its inertia, the floating mass continues the backward movement and hits the other moving parts. As a result, the moving parts as a whole will be kept in the above-mentioned open position
Implementation Method 5
the selection of the technical thermoplastic material makes it possible to improve the shock absorbing capacities
Data Source
AI summary
A semi-automatic rifle includes a frame (2); a barrel (3); a sliding guide (9) mounted in the frame (2) and forming one piece with breech bolts (10) which make it possible to control the recocking and the locking of the rifle (1); an automatic recock device (12) includes a piston (13) mounted in a gas cylinder (14) whose chamber (15) is connected to the bore (7) of the barrel (3) via a vent hole (16), whereby the piston (13) makes contact with the head of a sliding guide (17) which is connected to the sliding guide (9) and which is mounted in a sliding manner on a guiding rod (19) which forms one piece with the frame (2) and which is mainly parallel to the axis of the barrel (3). A floating mass (25) through which the guiding rod (19) passes is mounted in a sliding manner in the axial direction of the guiding rod (19) between two sides (27, 28) of a housing (24) in the head of the sliding guide (17) and a return spring (29) is mounted round the guiding rod (19) and situated between the frame (2) and the floating mass (25). The head of the sliding guide (17) is at least partially made of technical thermoplastic material.