Auto-Adjusting Tool Handle With Cam-Driven Expansion Members
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Solution Overview
Problem
Ergonomic handles for hand tools, such as screwdrivers, often fail to adapt effectively to varying torque levels, leading to suboptimal grip and comfort during use.
Innovation Solution
An auto-adjusting handle design featuring a rotatable working member with cam surfaces and expansion members that change the handle's cross-sectional shape in response to torque, returning to its original shape when torque is released, utilizing springs to maintain the resting state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the handle maintains a fixed cross-sectional shape, then the structure is simple and easy to manufacture, but the grip and comfort are suboptimal for varying torque levels
Solution Approach 1:
The handle transitions from a static fixed shape to a dynamic adjustable shape. Expansion members are disposed within slots in the handle and can move radially outward when torque is applied, changing the cross-sectional shape from a first shape to a second shape. This dynamic adjustment allows the handle to adapt to varying torque levels while maintaining structural integrity.
Solution Approach 2:
The handle is segmented into multiple functional components: a core part, a sleeve part surrounding the core, and multiple expansion members disposed in slots. This segmentation allows each component to perform its specific function - the expansion members can independently move to change the handle's cross-sectional shape, providing adaptability without requiring complete structural redesign.
2Ease of operation
If the handle changes shape in response to torque, then the grip and comfort are improved, but the mechanism becomes more complex
Solution Approach 1:
The handle mechanism is designed to automatically adjust its shape in response to applied torque without requiring external control. When torque is applied to the tool, the cam surfaces of the working member cooperate with the expansion members to cause them to move outward, automatically changing the handle's cross-sectional shape. The springs automatically return the expansion members to their initial position when torque is released, providing self-service operation that improves grip and comfort.
Solution Approach 2:
Springs are introduced as intermediary elements between the expansion members and the handle. These springs bias the expansion members toward their initial position within the slots, providing a restoring force that enables the handle to return to its original cross-sectional shape after torque is applied and released. This intermediary mechanism simplifies the overall system by providing automatic reset functionality.
3Adaptability or versatility
If expansion members are used to change handle shape, then adaptability to torque is improved, but the device complexity increases
Solution Approach 1:
The expansion members serve multiple functions simultaneously: they act as shape-changing elements that respond to torque, provide structural support when extended, and work in conjunction with springs for automatic reset. The cam surfaces on the working member cooperate with these same expansion members to enable the shape change. This multi-functionality reduces the need for separate components for each function, managing device complexity while improving adaptability.
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
Provides a better grip and improved user comfort by adapting the handle's shape to torque levels, ensuring optimal grip and ease of use across different torque applications.
Implementation Method 1
At least one spring is interposed between each of the plurality of expansion members and the handle for causing the handle to revert back to the first cross-sectional shape upon a removal of the torque as applied to the tool
Implementation Method 2
The handle has a longitudinally extending chamber and a portion of the working member, having cam surfaces, is disposed in the chamber. When a torque is applied to the tool, the cam surfaces of the working member cooperate with the plurality of expansion members to cause at least a portion of each of the plurality of expansion members to be moved outwardly from the slots
Data Source
AI summary
A tool has a working member, a plurality of expansion members, and a handle that is rotatable relative to the working member. The handle has a longitudinally extending chamber in which a portion of the working member having cam surfaces is disposed. The handle also has a plurality of slots in which the plurality of expansion members are disposed. When a torque is applied to the tool, the cam surfaces of the working member cooperate with the plurality of expansion members to cause at least a portion of each of the plurality of expansion members to be moved outwardly from the slots to thereby cause the handle to change from having a first cross-sectional shape to a second cross-sectional shape. At least one spring is interposed between each of the plurality of expansion members and the handle for causing the handle to revert back to the first cross-sectional shape upon a removal of the torque as applied to the tool.