Tool Shaft Securing Mechanism with Nested Ball Bearings
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Solution Overview
Problem
Existing hand tool mechanisms fail to securely attach implement shafts without misalignment and provide a rigid connection, leading to perceived play or toggle during use, which can result in errors and decreased user confidence.
Innovation Solution
A securing mechanism featuring an engagement socket with axial grooves and ball bearings, a locking sleeve with tapers, and a biasing spring, which ensures proper alignment and secure attachment of the shaft to the handle, eliminating play and toggle by engaging the shaft at multiple points and maintaining concentric alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple attachment mechanism is used, then the device complexity is reduced, but the alignment precision and connection rigidity deteriorate, causing misalignment and play between the implement shaft and tool handle
Solution Approach 1:
The ball bearings are nested within the engagement socket, which is itself nested within the tool handle. The implement shaft passes through these nested components, with the ball bearings positioned between the shaft and socket wall. This nested arrangement provides precise alignment and rigid connection without requiring complex external alignment mechanisms.
Solution Approach 2:
The ball bearings act as intermediary elements between the implement shaft and the engagement socket. These bearings maintain concentric alignment of the shaft within the socket while allowing for easy attachment and detachment. The intermediary bearings transfer loads efficiently and prevent misalignment without adding significant complexity to the overall mechanism.
2Ease of operation
If a simple attachment mechanism is used, then the ease of operation is improved, but the connection rigidity deteriorates, resulting in toggle and play between the handle and implement
Solution Approach 1:
The nested arrangement of ball bearings within the engagement socket creates a compact structure that provides rigid connection. The bearings are contained within the socket geometry, eliminating the need for external locking mechanisms or complex assembly procedures. This nested design achieves both ease of operation and strong, rigid connection simultaneously.
Solution Approach 2:
The ball bearings change the mechanical parameters of the connection by providing rolling contact between the implement shaft and socket. This changes the friction characteristics and load distribution, resulting in a rigid connection that eliminates toggle and play while maintaining easy attachment and detachment operations.
3Manufacturing precision
If multiple ball bearings are used in the engagement socket, then the alignment precision is improved, but the device complexity increases
Solution Approach 1:
Multiple ball bearings are nested within the single engagement socket structure, which itself is nested within the tool handle. This nested configuration allows multiple bearings to work together for precise alignment without requiring separate mounting structures or complex assembly procedures. The complexity is minimized by containing all bearing elements within the existing socket geometry.
Solution Approach 2:
The engagement socket serves multiple functions: it houses the ball bearings, provides the attachment interface for the implement shaft, maintains alignment, and transfers loads. By making the socket multi-functional, the design avoids adding separate components for each function, thereby achieving precise alignment with multiple bearings without proportionally increasing overall device complexity.
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
The mechanism securely attaches and aligns implement shafts with the handle, reducing axial misalignment and perceived play, enhancing the tool's performance and user confidence by providing a rigid and reliable connection.
Implementation Method 1
a biasing member, such as a spring, to press the ball bearings against the shaft
Implementation Method 2
an engagement socket... with ball bearings... to press the ball bearings against the shaft
Data Source
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AI summary
A securing mechanism is provided for a tool that allows for the attachment and release of the shafts of a variety of implements from the tool. The mechanism has a construction that provides an easily releasable, but secure engagement of the implement shaft within the mechanism while also having an alignment feature which engages the implement at multiple locations when engaged with the mechanism to maintain the alignment and concentricity of the implement shaft with regard to the mechanism and the tool when in use.