Power Tool Locking Assembly for Vibration Clamping
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Solution Overview
Problem
Existing power tools with quick clamping devices are inadequate for securely clamping working elements driven by vibration devices, as they fail to maintain clamping force against the forces generated by such vibrations.
Innovation Solution
A power tool with a locking assembly that includes a fastening piece with a projecting shaft, a locking member, and a movable member with unequal radial distances from the shaft center, allowing for a strong clamping force and easy operation, even under impact conditions, using an elastic component and shaped-locking components for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a quick clamping device with a threaded pin and spring is used, then the working element can be clamped without auxiliary tools, but the clamping force is insufficient under vibration-driven conditions
Solution Approach 1:
The locking member is designed to move between a locking position and a loosening position, transitioning from a static spring-based clamping mechanism to a dynamic positioning system. This allows the clamping force to be actively adjusted and maintained at higher levels regardless of vibration-induced movements, resolving the contradiction between ease of operation and sufficient clamping force under vibration conditions
Solution Approach 2:
The invention changes the clamping force parameter from a spring-determined variable force to a fixed structural position determined by the locking member's geometry. The locking member's position (locking vs. loosening) directly controls the clamping force magnitude, enabling sufficiently strong and stable clamping force even under vibration-driven working conditions while maintaining simple operation
2Reliability
If a locking assembly with movable member and unequal radial distances is added, then the clamping force under vibration is enhanced, but the device complexity increases
Solution Approach 1:
The movable member is designed with unequal radial distances from its first portion and second portion to the shaft center. This asymmetric geometry allows the member to selectively engage with different portions of the locking member (first portion for locking, second portion for loosening), providing reliable position-dependent control while maintaining a relatively simple overall structure that does not require additional complex mechanisms
3Reliability
If a shaped-locking component and toothed-part engagement are implemented, then the locking action reliability is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The shaped-locking component and toothed-part engagement features are integrated directly into the existing locking member and projecting shaft structures. Rather than adding separate components, the invention merges the locking and anti-backlash functions into the primary locking assembly parts themselves, enhancing reliability through positive mechanical engagement while avoiding the need for additional manufacturing processes or separate parts
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 power tool effectively secures working elements to the output shaft without auxiliary tools, ensuring reliable clamping even during vibration, with a simple and compact design that reduces construction costs and enhances operational ease.
Implementation Method 1
the fastening piece presses towards an end portion of the driving shaft by an elastic component
Data Source
AI summary
A power tool has a driving shaft driving a working element, a fastening piece fastening the working element to the driving shaft having a projecting shaft insertable into the driving shaft, a locking assembly locking the projecting shaft in the driving shaft having a locking member wherein the locking member has a locking position for locking the projecting shaft with the driving shaft and a loosening position for loosening the projecting shaft with the driving shaft. At the locking position, the fastening piece is pressed towards an end portion of the driving shaft by an elastic component. The locking assembly further includes a movable member arranged outside of the driving shaft, the movable member having a first portion and a second portion which can be directly or indirectly mated with the locking member wherein a radial distance of the first portion relative to a shaft center of the driving shaft is unequal to that of the second portion relative to the shaft center of the driving shaft.