Guide Assembly for Frozen Fastener Removal
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Solution Overview
Problem
Conventional methods for removing frozen fasteners often result in damage to the fastener or surrounding structure due to misalignment and insufficient down force application, requiring skilled operation and being ineffective in difficult-to-access areas or contoured surfaces.
Innovation Solution
A guide assembly with adjustable clamping and alignment mechanisms, including a frame assembly with arms and a head assembly featuring a tool sleeve for applying axial force and a spherical bearing for precise alignment, allows for secure attachment and controlled removal of fasteners from various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional screw extractors are used to remove frozen fasteners, then the fastener can be removed, but the engagement hole may be stripped out or the fastener head may be damaged due to misalignment and insufficient down force
Solution Approach 1:
The guide assembly serves as an intermediary device between the operator and the screw extractor. It includes a guide body with a guide bore that receives the screw extractor, and a guide arm with a clamping assembly that applies down force. This intermediary structure ensures proper alignment and force application, preventing damage to the engagement hole and fastener head while enabling reliable fastener removal.
2Ease of operation
If manual alignment and down force application are required for screw extractor operation, then the operator has flexibility, but the operation becomes complex and requires skilled operators
Solution Approach 1:
The guide assembly is designed to be self-aligning and self-adjusting. The guide bore automatically aligns the screw extractor with the engagement hole, and the clamping assembly automatically applies the necessary down force when the guide arm is positioned against the structure. This eliminates the need for skilled manual alignment and force application, making the operation easier and more consistent.
3Manufacturing precision
If the engagement hole must be precisely aligned with the fastener centerline, then the threaded bore is protected from damage, but the operation becomes difficult in contoured surfaces or difficult-to-access areas
Solution Approach 1:
The guide assembly incorporates movable and adjustable components that allow it to adapt to different surface geometries. The guide arm can be positioned at various angles and locations, and the clamping assembly can apply force in different directions. This dynamic capability enables precise alignment of the engagement hole with the fastener centerline even on contoured surfaces or in difficult-to-access areas, combining manufacturing precision with adaptability.
Data Source
AI summary
A guide assembly comprises a frame assembly, a plurality of clamping assemblies, and a head assembly. The clamping assemblies may be mountable to the frame assembly for attaching the frame assembly to a structure. The head assembly may be mountable to the frame assembly and may include a tool coupled to the head assembly. The tool assembly may be axially movable relative to the head assembly to cause the tool to exert a down force on the structure when the frame assembly is attached thereto.