Gear-Amplified Fastener Assembly for Tool-Free Power Tool Changes
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Solution Overview
Problem
Existing solutions for changing detachable implements in power tools are inconvenient, often requiring additional tools, applying significant manual force, and may lead to functional failures due to exposure and damage from environmental factors.
Innovation Solution
A force amplified fastener assembly utilizing gear trains, such as planetary or cycloidal gearing, provides mechanical advantage for manual tightening and loosening of fasteners, allowing tool-free implement changes with a lock mechanism that can be user-activated or automatically locked by centrifugal force or gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional fastener assembly is used to attach detachable implements to power tools, then the implement can be securely fastened, but significant manual force or additional tools are required to tighten and loosen the fastener
Solution Approach 1:
A gear train mechanism acts as an intermediary between the user's manual input and the fastener. The gear train (including planetary gears and worm gears) amplifies the user's rotational force, enabling fastener manipulation without requiring excessive manual strength or additional tools.
Solution Approach 2:
The system changes the torque parameter through mechanical advantage provided by the gear train. The gear ratios transform small input torque from manual rotation into large output torque sufficient to tighten or loosen the fastener securely.
2Ease of operation
If hand tools are stored on or with the power tool for implementing changes, then tool availability is improved, but the hand tools can migrate from storage space and be lost due to vibrations and rugged use
Solution Approach 1:
The fastener assembly is designed to be self-sufficient, requiring no external hand tools for installation or removal. The integrated gear train mechanism allows the user to manipulate the fastener directly, eliminating the need to carry, store, or retrieve separate wrenches or tools.
Solution Approach 2:
The functionality previously requiring separate hand tools is merged into the fastener assembly itself. The gear train mechanism is integrated directly into the fastener, combining the fastening function with the torque multiplication function in a single unified component.
3Reliability
If the fastener is seated with appreciable torque to prevent unwanted relative displacement, then the implement connection is more reliable, but the fastener becomes difficult to loosen and remove
Solution Approach 1:
The gear train serves as a mediator that enables both tight fastening and easy removal. During installation, it provides the mechanical advantage needed to seat the fastener with high torque for reliable connection. During removal, it again provides mechanical advantage to overcome the high friction and torque resistance.
4Reliability
If a latch mechanism is exposed to prevent unwanted release, then the fastening security is improved, but the latch components are exposed to environmental factors and may be damaged or fail
Solution Approach 1:
The anti-backlash feature is built into the gear train design itself, preventing gaps and play before they can cause malfunction. This preliminary design consideration ensures continuous gear engagement and prevents the mechanism from becoming loose or malfunctioning during operation.
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
Enables convenient, tool-free changing of detachable implements by amplifying manual force, preventing unintentional detachment, and protecting components from environmental damage.
Implementation Method 1
A force amplified fastener assembly utilizes gear trains, such as planetary or cycloidal gearing, provides mechanical advantage for manual tightening and loosening of fasteners
Implementation Method 2
a lock mechanism that can be user-activated or automatically locked by centrifugal force or gravity
Implementation Method 3
a lock mechanism that can be user-activated or automatically locked by centrifugal force or gravity
Data Source
AI summary
Systems and methods which provide force amplified fastener assemblies configured for use with respect to detachable implements for power tools are described. Force amplified fastener assemblies may implement various gear train configurations for giving a mechanical advantage with respect to manual manipulation of the fastener assembly. A force amplified fastener assembly may include a lock mechanism operative to lock and/or unlock the force amplified fastener assembly and thus a fastening element thereof. Force amplified fastener assemblies of embodiments of the inventions may be utilized in place of conventional lock nut for affixing detachable implements to power tools.