Dual-Mode Shear Assembly for Force and Cutting Speed Switching
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Solution Overview
Problem
Existing hand tools, such as outdoor shears and loppers, are limited in their ability to switch between compound and speed action, requiring users to exert different forces for cutting various thicknesses and densities of materials, and often necessitate repeated motions for efficient cutting.
Innovation Solution
A hand tool design featuring a shear assembly with a first handle, second handle, cutting blade, and linkage, allowing for a selective sliding arrangement via fasteners to pivotally couple components, enabling a dual-mode operation between compound and speed action without requiring component removal or separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the hand tool is designed for compound action to apply greater force, then the force application capability is improved, but the cutting speed deteriorates
Solution Approach 1:
The hand tool incorporates a linkage system with a movable connection point that allows dynamic reconfiguration between compound action mode (for greater force) and speed action mode (for faster cutting). The linkage includes a first connection point for compound action and a second connection point for speed action, enabling the user to switch modes based on material thickness and cutting requirements.
2Speed
If the hand tool is designed for speed action to cut thinner materials quickly, then the cutting speed is improved, but the force application capability deteriorates
Solution Approach 1:
The hand tool incorporates a linkage system with a movable connection point that allows dynamic reconfiguration between compound action mode (for greater force) and speed action mode (for faster cutting). The linkage includes a first connection point for compound action and a second connection point for speed action, enabling the user to switch modes based on material thickness and cutting requirements.
3Device complexity
If the hand tool uses fixed linkage configuration, then the device complexity is reduced, but the adaptability deteriorates
Solution Approach 1:
The linkage system is segmented into multiple connection points (first connection point and second connection point) that can be selectively engaged. This segmentation allows the tool to offer multiple operating modes without requiring complete redesign or additional complex mechanisms, maintaining simplicity while enhancing adaptability.
Solution Approach 2:
The single linkage system serves multiple functions by accommodating both compound action mode and speed action mode through its movable connection point. This multi-functionality allows one tool to replace what would traditionally require separate tools for different cutting tasks.
4Adaptability or versatility
If the hand tool requires component removal or separation to switch modes, then the adaptability is improved, but the ease of operation deteriorates
Solution Approach 1:
The mode switching is achieved through a dynamic, movable connection point on the linkage that can be easily repositioned between the first connection point and the second connection point. This eliminates the need to remove or separate components, allowing users to switch between compound and speed action modes quickly and conveniently during operation.
Data Source
AI summary
A hand tool includes a first handle forming a channel, and a second handle including a cutting member. A linkage is attached in pivotal arrangement to the first handle at the channel and to a cutting blade. The cutting blade is attached in pivotal arrangement to the second handle. The first handle is pivotally attached to the second handle via a fastener. The first handle includes a first portion, and a second portion includes a handle grip. The first portion extends substantially along a first reference axis, and the second portion extends substantially along a second reference axis. The first reference axis and the second reference axis extend at an acute angle relative to one another. The channel extends substantially along the first reference axis at the first portion.