Barrel Clamp Safety Retainer for Minigun Vibration
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Solution Overview
Problem
The rapid rotation and vibration of minigun barrels can cause fasteners securing the barrel clamp to come off, leading to dangerous and destructive situations due to improper installation or wear, resulting in the barrel clamp slipping into the line of fire.
Innovation Solution
A barrel clamp safety retainer with a two-part hinged and pinned clamp collar that captures the barrel clamp and lugs, featuring scallops and aligned apertures, secures the barrel clamp even if the fasteners fail, preventing the barrel clamp from sliding into the line of fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a self-locking nut is used to secure the barrel clamp, then the barrel clamp can be fastened to the barrels, but the locking portion of the nut wears out due to repeated installation and removal, resulting in the nut backing off during operation
Solution Approach 1:
The fastening system is divided into separate components: a castellated nut (replacing the self-locking nut) and a cotter pin. The castellated nut provides the fastening function while the cotter pin provides the locking function, separating the wear-prone locking mechanism from the fastening mechanism. This segmentation allows the cotter pin to prevent backing off without undergoing repeated installation/removal cycles that cause wear.
Solution Approach 2:
The cotter pin is installed through the castellated nut and a hole in the barrel clamp bolt before operation begins. This preliminary locking action prevents the nut from backing off during operation, addressing the reliability issue before it can manifest. The cotter pin is positioned in advance to engage with the nut's slots, creating a mechanical stop that prevents rotation in the loosening direction.
2Ease of operation
If the barrel clamp is secured with fasteners, then the barrel clamp is attached to the barrels, but the fasteners are vulnerable to improper installation, causing the barrel clamp to slip into the line of fire
Solution Approach 1:
The castellated nut and cotter pin arrangement provides a self-checking mechanism. The cotter pin must be properly installed through specific slots in the nut to secure it, providing visual and physical confirmation of proper installation. If the cotter pin is missing or improperly installed, the system does not function, providing immediate feedback to the operator. This self-service approach reduces reliance on operator skill while maintaining high security.
3Strength
If the barrel clamp bolt is overtightened to secure the clamp, then the clamp is firmly attached, but the bolt heats up and breaks because it cannot expand during operation
Solution Approach 1:
The fastening system uses a castellated nut that allows for precise control of clamping force. Unlike overtightening a standard bolt, the castellated nut with cotter pin allows the operator to tighten to the point of secure attachment and then lock the position, preventing both overtightening (which causes thermal stress) and undertightening (which causes loosening). The system changes the parameter control from continuous (bolt torque) to discrete (nut position with cotter pin locking).
Data Source
AI summary
A minigun having a plurality of barrels. At least one barrel has a lug. A barrel clamp is attached to the barrels. The barrel clamp has a rear portion with apertures to receive the barrels. The barrel clamp has a front portion with apertures to receive the free end of the barrels. A clamp collar captures both the rear portion of the barrel clamp and at least one lug. The clamp collar may have two parts that are hingedly attached at one end and releasably pinned at the other end. Each of the two parts may have two flanges. The two flanges may be spaced apart by a distance defined by the barrel clamp's length. Each of the flanges may include a plurality of scallops. The clamp collar and the barrel clamp may each include a plurality of apertures that are aligned when the clamp collar is closed.