Helicopter Rotor Blade Clamp with Pivoting Lever Arms
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Solution Overview
Problem
Conventional rotor blade clamping devices are specific to one blade profile, apply excessive force, and can damage composite materials like carbon fiber, limiting their universal application and causing damage to rotor blades.
Innovation Solution
A clamping device comprising frame plates, lever arms, a linkage assembly, bridge arms, upper and lower pad assemblies, and elastomeric pads that pivot and translate to distribute pressure evenly across the rotor blade, allowing for universal fit and reduced force on any given point, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rotor blade clamping devices are designed for a specific blade profile, then they can securely clamp that particular blade type, but they cannot be used on more than one type of helicopter blade
Solution Approach 1:
The clamping device employs movable bridge arms that can pivot and adjust their position dynamically. This allows the device to adapt to different blade profiles by changing the configuration of the bridge arms, enabling universal compatibility while maintaining a relatively simple overall structure through motion rather than complex interchangeable parts
Solution Approach 2:
The clamping device is divided into separate modular components including frame plates, lever arms, linkage assemblies, and bridge arms that can independently adjust. This segmentation allows each component to be optimized for simplicity while the combination provides adaptability across different blade types
2Reliability
If conventional clamping devices apply high clamping force to secure rotor blades, then they effectively immobilize the blades, but they can cause damage to composite materials such as carbon fiber
Solution Approach 1:
The clamping device uses soft pads at the contact points between the bridge arms and the rotor blade. These pads distribute the clamping force locally across a larger surface area, reducing pressure concentration on any single point of the composite blade material while maintaining overall immobilization effectiveness
Solution Approach 2:
The soft padding material is pre-installed on the clamping surfaces to cushion and distribute forces before contact with the blade occurs. This protective layer prevents direct hard contact between the metal clamping mechanism and the fragile composite blade, preventing damage beforehand
Data Source
AI summary
An apparatus comprises frame plates, lever arms, a linkage assembly, bridge arms, upper pad assemblies, and lower pad assemblies. The lever arms are operative to pivot relative to the frame plates. The linkage assembly is pivotally coupled to the frame plates and to the lever arms. The bridge arms are pivotally coupled to the lever arms. The upper pad assemblies are pivotally coupled to the bridge arms. Lastly, the lower pad assemblies are pivotally coupled to the frame plates. Pivoting the lever arms in a first direction translates the upper pad assemblies towards the lower pad assemblies, and pivoting the lever arms in a second direction translates the upper pad assemblies away from the lower pad assemblies. Actuation of the linkage assembly is operative to cause the lever arms to pivot.