Oscillating Multi-Tool Snap-Fit Accessory Clamping
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Solution Overview
Problem
Conventional oscillating power tools require tools for changing and securing accessories, which can be cumbersome and may lead to misalignment or loss of clamping force during operation.
Innovation Solution
An oscillating power tool system with a tool-less clamping mechanism and snap-fit attachment system, featuring a cam-actuated lever and annular attachment portion that securely engages with the tool holder and housing, allowing for easy accessory exchange and maintaining clamping force without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fasteners (screws, hex keys) are used to secure accessories, then reliable clamping force is achieved, but accessory exchange becomes time-consuming and requires additional tools
Solution Approach 1:
The patent extracts the fastener (screw, hex key) from the accessory attachment system, replacing it with a tool-less snap-fit mechanism. The attachment portion incorporates flexible tabs that engage with corresponding features on the tool holder, eliminating the need for separate fastening components and enabling direct attachment by snapping the accessory into place.
Solution Approach 2:
The attachment portion is designed to be self-securing through its snap-fit mechanism. The flexible tabs automatically engage with the tool holder features when the accessory is inserted, providing self-alignment and self-clamping without requiring external tools or manual fastening operations.
2Reliability
If conventional fasteners are used to secure accessories, then adequate clamping force is provided, but misalignment and loss of clamping force during operation may occur
Solution Approach 1:
The attachment portion features asymmetric flexible tabs with specific engagement geometries that match corresponding asymmetric features on the tool holder. This asymmetric design ensures proper orientation and alignment during attachment, preventing misalignment issues that can occur with symmetric fastener systems.
Solution Approach 2:
The flexible tabs are pre-formed with built-in elasticity and engagement features that automatically align the accessory with the tool holder during the attachment process. This preliminary alignment action occurs before final engagement, ensuring precise positioning without requiring separate alignment steps.
3Productivity
If tool-less snap-fit mechanism is used, then accessory exchange speed is improved, but attachment security may be compromised
Solution Approach 1:
The flexible tabs incorporate curved and rounded engagement surfaces that distribute attachment forces evenly across the interface. The curved geometry allows the tabs to flex during attachment while maintaining consistent contact pressure, ensuring secure engagement without requiring excessive clamping force.
Solution Approach 2:
The attachment system utilizes changes in the physical state of the flexible tabs during attachment. The tabs transition from a flexible, deformable state during insertion to a locked, rigid state during operation. This parameter change allows easy attachment while maintaining secure connection under load.
Data Source
AI summary
An accessory for an oscillating power tool that oscillatingly drives a removably attachable output element. The accessory includes an attachment portion configured to be removably attached to a housing of the oscillating power tool on a side of the output element that faces the housing. The attachment portion is at least partially annular and defines an axial opening therethrough. The attachment portion includes a circumferential inner surface defining the axial opening and a circumferential outer surface opposite the inner surface. The attachment portion is configured to snap-fit with the power tool housing.