Power Tool Spindle Lock Layout for Compact Tool Holding
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Solution Overview
Problem
The existing power tool designs face limitations in the degree of freedom for designing the spindle and lock mechanism, which restricts the size reduction and efficiency of the tool.
Innovation Solution
The power tool incorporates a lock mechanism with a clamp member and collar member that have sliding contact regions with inclined elements, allowing for compact design and easy assembly, and a biasing member to securely hold the tool accessory, enabling size reduction and improved usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock mechanism is arranged within the spindle, then the tool accessory can be held stably, but the degree of freedom in designing the spindle and lock mechanism is limited
Solution Approach 1:
The lock mechanism is separated from the spindle into an independent component. The clamp member is positioned outside the spindle, allowing the spindle to be designed independently for optimal performance while the lock mechanism can be configured separately for ease of operation and manufacturing.
Solution Approach 2:
The clamp member acts as an intermediary between the user's manual operation and the tool accessory holding. By positioning the clamp member outside the spindle and using a collar member with inclined elements, the system provides mechanical advantage and easier operation while maintaining secure holding stability.
2Reliability
If the lock mechanism is arranged within the spindle, then the tool accessory can be held stably, but the size of the power tool increases
Solution Approach 1:
The lock mechanism is repositioned from a centralized location within the spindle to an external position using the collar member with inclined elements. This spatial redistribution allows for more efficient use of space, reducing the overall tool size while maintaining holding stability through the external clamp member configuration.
3Ease of manufacture
If the clamp member and collar member have sliding contact with inclined elements, then the assembly is simplified and size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The inclined elements on the collar member are designed with specific geometric parameters that provide mechanical advantage. By optimizing the inclination angles and dimensions, the system achieves easy assembly through natural self-alignment while distributing the precision requirements across multiple surfaces rather than requiring extreme precision in a single location.
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
This configuration enhances the power tool's design flexibility, reduces its size, and simplifies the assembly and repair process while maintaining effective operation of the tool accessory.
Implementation Method 1
The sliding contact region has a first inclined element inclined with respect to the spindle rotation axis and a second inclined element inclined with respect to the spindle rotation axis
Data Source
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AI summary
It is an object of the invention to increase the degree of freedom in designing a power tool. A representative power tool 100 has a spindle 124 that transmits a driving force of a motor 115 to a tool accessory 145, a tool accessory holding member 127 that is configured to be movable in a direction of a spindle rotation axis direction 124a between a holding position for holding the tool accessory 145 and a releasing position for releasing the tool accessory 145, a lock mechanism 130 that locks the tool accessory holding member 127 in the holding position, and a body housing 101. The lock mechanism 130 is disposed between a second end 1241 of the spindle 124 and a wall of the body housing 101 in the spindle rotation axis direction 124a.