Reaction Arm Quick-Change Collar for Secure Torque Tool Attachment
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Solution Overview
Problem
Existing reaction arm power tools face challenges in efficiently and quickly changing reaction arm accessories, leading to user inconvenience and potential damage during removal processes.
Innovation Solution
The implementation of a quick-change removal assembly in reaction arm accessories, featuring a collar with locking protrusions and a torsion spring mechanism, allows for secure attachment and easy detachment from the power tool by rotating between locked and unlocked positions, ensuring axial retention and rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fixed attachment method is used for reaction arm accessories, then the connection is secure and reliable, but the time required to change accessories is excessive and user fatigue increases
Solution Approach 1:
The collar is designed to be rotatable between different positions (locked and unlocked) to dynamically change the attachment state. The locking protrusions can engage with spline teeth to secure the accessory or align with gaps to allow removal, enabling quick transition between attached and detached states without manual disassembly
Solution Approach 2:
The spring mechanism automatically urges the collar into the locked position, engaging locking protrusions with spline teeth to secure the accessory without requiring additional fastening operations. The system self-secures upon attachment, eliminating the need for separate locking steps
2Strength
If a secure locking mechanism is implemented, then the reaction arm accessory remains firmly attached during high torque applications, but the removal process becomes difficult and may cause damage
Solution Approach 1:
The collar transitions between static locked positions (engaging spline teeth) and an unlocked position (aligned with gaps). Rotating the collar changes the engagement state, allowing firm attachment during operation and easy removal when unlocked, preventing damage from forced detachment
Solution Approach 2:
The locking protrusions act as intermediaries between the collar and spline teeth. They provide the locking function when engaged and can be easily disengaged by rotating the collar, mediating between the need for secure attachment and easy removal
3Device complexity
If a simple attachment interface is used, then the device complexity is reduced, but the ability to provide secure retention during high torque applications is compromised
Solution Approach 1:
The splined interface serves multiple functions: it provides torque transmission, defines the engagement geometry for locking protrusions, and creates the gaps that enable unlocking. This multi-functional design achieves secure retention without requiring separate complex locking components
Solution Approach 2:
The attachment interface is segmented into discrete spline teeth and gaps. The locking protrusions engage with individual teeth, allowing selective engagement points. This segmentation enables a relatively simple interface structure to provide reliable retention through distributed engagement points
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates quick and secure attachment/detachment of reaction arm accessories, reducing user fatigue and preventing damage, while maintaining high torque application capabilities.
Implementation Method 1
a spring surrounding the collar and configured to urge the collar towards the locked position
Implementation Method 2
wherein the spring is a torsion spring
Data Source
AI summary
A reaction arm accessory for a power tool may include a body having a distal end configured to engage a fixed structure and an attachment end defining a splined connection configured to engage a splined interface of the power tool, the splined interface including a plurality of spline teeth defining gaps between adjacent spline teeth. The accessory may include a quick-change removal assembly supported in the body adjacent the splined connection and configured to selectively secure the reaction arm accessory to the splined interface of the tool. The quick-change removal assembly may include a collar rotatable between a locked position and an unlocked position, the collar including a plurality of locking protrusions and a spring surrounding the collar and configured to urge the collar towards the locked position.