Non-Circular Spigot Recess Alignment for Tool Parts
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Solution Overview
Problem
Existing connection systems for tool parts, particularly in rotary tools, face challenges in achieving exact alignment in both axial and radial directions without causing the parts to stick together, necessitating additional push-off mechanisms due to elastic deformations from oversized components.
Innovation Solution
A connection system utilizing a spigot with a non-circular cross-section that matches a recess on the second tool part, eliminating the need for oversizing, allowing for precise alignment and force transfer without deformation, and featuring a compact design with minimal material weakening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spigot is oversized relative to the recess to ensure play-free connection and force transfer, then the connection strength is improved, but the parts become stuck together after loosening the tensioning screw
Solution Approach 1:
The patent changes the dimensional parameter relationship between spigot and recess from oversized to exactly matching or slightly smaller, eliminating elastic deformation while maintaining connection strength through precise geometric matching and tensioning screw clamping force
2Ease of operation
If additional push-off devices are added to enable easy detachment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the additional push-off device from the connection system by redesigning the spigot-recess dimensional relationship, allowing the tensioning screw alone to provide both clamping and detachment functions
Solution Approach 2:
The connection system becomes self-servicing through the redesigned spigot-recess interface, where the matching dimensions allow automatic alignment and easy detachment without requiring separate push-off mechanisms
3Reliability
If the spigot is oversized to achieve play-free connection, then the reliability of force transfer is improved, but material deformation occurs
Solution Approach 1:
The patent changes the dimensional parameters of the spigot and recess to match exactly or have the spigot slightly smaller, eliminating the need for elastic deformation while ensuring play-free connection through precise geometric matching
Solution Approach 2:
The patent employs asymmetric non-circular cross-sections for the spigot and recess that are precisely matched, creating directional alignment and play-free connection without requiring symmetric oversized dimensions that cause deformation
Data Source
AI summary
A connection system which produces an aligned connection between first and second tool parts includes a spigot projecting from the first tool part, and a spigot-receiving recess formed in the second tool part. The spigot and the recess have correspondingly shaped, non-circular cross-sections. The spigot is not oversized relative to the recess, and may be smaller than the recess, so that the spigot can be inserted into the recess without the recess being expanded or the recess being compressed.