Dual-Use Nut Cage for Tool-Free Multi-Nut Assembly
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Solution Overview
Problem
Existing nut-cage systems require multiple types for different nut designs, necessitating tool access for installation, which is impractical in areas where access is difficult or impossible, leading to inefficiencies in assembly processes, especially in complex structures like aircraft.
Innovation Solution
A dual-use nut-cage system that accommodates both snap-in nuts and clip-retained nuts using a common design, featuring a U-shaped configuration with adaptable slots and rivet apertures, allowing for universal application without the need for tool access, utilizing a single type of nut cage throughout an assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of nut cages are used for different nut designs, then the system can accommodate various nut configurations, but the device complexity and assembly process complexity increase
Solution Approach 1:
The nut cage is designed with a universal configuration that can accommodate both snap-in nuts and clip-retained nuts. The cage features a body with an opening and internally threaded fastener apertures that can retain different types of nuts through different mechanisms (snap-in action or clip retention), eliminating the need for multiple specialized cage designs.
Solution Approach 2:
The nut cage design separates the retention mechanisms into distinct functional elements: the cage body provides structural support and positioning, while the fastener apertures provide threaded engagement. This segmentation allows the same cage structure to work with different nut types through different retention methods.
2Manufacturing precision
If tool access is required for nut cage installation, then precise installation can be achieved, but the ease of operation decreases in constrained environments
Solution Approach 1:
The snap-in nut design allows the nut to be self-installed into the cage without requiring external tools. The nut features tabs that snap into slots on the cage body, enabling installation by simply pushing the nut into place, which is particularly advantageous in constrained environments where tool access is limited.
3Reliability
If multiple nut cage types are used throughout an assembly, then specific nut designs can be optimized, but the loss of time and productivity decrease due to inventory and installation complexity
Solution Approach 1:
By designing a single universal nut cage type that can accommodate both snap-in nuts and clip-retained nuts, the system eliminates the need to maintain multiple cage inventories. This universal design maintains reliable retention for both nut types while significantly improving assembly productivity through standardized installation procedures.
4Ease of operation
If clip-retained nuts are used, then the nut can be secured without tool access, but the device complexity increases due to additional components
Solution Approach 1:
The clip is integrated as part of the nut assembly rather than being a separate installation tool. The C-shaped clip is positioned to engage with slots on the cage body, providing retention while maintaining a relatively simple overall structure that combines the nut, clip, and cage into a cohesive assembly.
Data Source
AI summary
A nut-cage system has a nut cage having a base plate and two wings extending from the base plate on opposite sides of the base plate. The wings and base plate form a U-shape, each wing having a slot formed therein, and a fastener aperture is formed through the base plate. A snap-in threaded nut has a pair of tabs extending from a base thereof. A clip-retained threaded nut has a flange extending from a base thereof and is configured for use with a retainer clip. The slots are sized for receiving the tabs of the snap-in nut when the snap-in nut is installed in the nut cage and for receiving portions of the retainer clip when the clip-retained nut and retainer clip are installed in the nut cage, thereby retaining a selected one of the nuts within the cage.