Extendible Hand Pruner Handles and Rotatable Cutting Head
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Solution Overview
Problem
Existing hand pruners are difficult to grasp and require significant hand strength, making them uncomfortable and challenging for users such as women, the elderly, and those with disabilities, while also lacking in quality, reliability, versatility, weather-resistance, high strength, low weight, and low manufacturing costs.
Innovation Solution
A hand pruner design featuring extendible handles and a universally rotatable cutting head with adjustable blade orientations, allowing for reduced hand strength requirements and improved operational performance through ergonomic grip design and adjustable length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fixed-length handles are used, then the pruner structure is simple, but the ease of operation deteriorates due to difficulty in grasping and holding with two hands
Solution Approach 1:
The handle is designed with extendible and retractable segments that can dynamically adjust their length. The handle includes a first segment and a second segment that can be extended or retracted relative to each other, allowing the pruner to adapt to different user hand sizes and grasping needs, thereby improving ease of operation while managing complexity through controlled mobility
2Adaptability or versatility
If traditional fixed-length handles are used, then the manufacturing cost is low, but the versatility deteriorates due to inability to adapt to different users and conditions
Solution Approach 1:
The handle incorporates movable segments that can be extended or retracted, providing adaptability to different user hand sizes and cutting conditions. This dynamic adjustment capability enhances versatility for various users including women, elderly, and handicapped individuals, while the segmented design allows for modular manufacturing approaches
Solution Approach 2:
The extendible handle design serves multiple functions by accommodating different user preferences and physical capabilities. The same pruner can be used by individuals with different hand sizes, and the handle can be adjusted for different cutting scenarios, making the tool universally applicable across diverse user groups and application conditions
3Ease of operation
If traditional fixed-length handles are used, then the device is simple, but the hand strength requirement increases making it uncomfortable for women, elderly, and handicapped users
Solution Approach 1:
The handle allows dynamic adjustment of length through extendible and retractable segments. Users can retract the handle to a shorter length for tasks requiring less leverage or extend it for tasks requiring greater reach and mechanical advantage, thereby reducing the hand strength requirement for different users and tasks while managing complexity through controlled mobility
4Adaptability or versatility
If the cutting head is fixed in orientation, then the structure is simple, but the adaptability deteriorates due to inability to provide precise cutting angles
Solution Approach 1:
The cutting head is designed with rotational capability relative to the handle, allowing it to be rotated to different orientations. This dynamic adjustment enables precise cutting angles by rotating the cutting head to align with the desired cutting direction, thereby enhancing adaptability for cutting branches at various angles while managing complexity through controlled rotation
Data Source
AI summary
A hand tool for cutting includes a first handle, a second handle pivotably connected to the first handle, and a cutting head including a fixed first blade and a pivotable second blade to provide cutting action with the first blade. The first and second handles are movable between a fully retracted configuration and a fully extended configuration to selectively adjust the length of the handles. The cutting head is selectively rotatable about a central longitudinal axis and carries the blades upon rotation of the cutting head to move the blades between a plurality of different orientations relative to the first and second handles. The cutting head includes a connector operably connecting the second handle and the second blade so that pivoting motion of the second handle moves the second blade relative to the first blade to provide cutting action therebetween.