Slidable Pulley Pruning Tool for Variable Branch Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pruning tools with elongated poles struggle to efficiently cut branches of varying diameters and orientations due to the need for frequent adjustments in pulling force, leading to reduced accuracy, increased operator fatigue, and prolonged pruning cycles.
Innovation Solution
A pruning tool with a slidable pulley arrangement and dual actuation handles allows for consistent pulling force across different cutting actions, enabling efficient cutting of thin and thick branches without requiring force adjustments, using a stopper mechanism for smooth transitions between cutting modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuation handle with fixed pulling force is used, then the device complexity is reduced, but the adaptability to cut branches of varying diameters deteriorates
Solution Approach 1:
The patent implements a slidable pulley arrangement that can move along the elongated pole, changing its position dynamically based on the branch diameter being cut. This dynamic adjustment allows the same actuation mechanism to adapt to different cutting requirements without increasing overall device complexity.
Solution Approach 2:
The actuation mechanism is segmented into multiple components: a first actuation handle, a second actuation handle, and a slidable pulley arrangement. This segmentation allows each component to perform a specific function while working together to achieve adaptability across different branch sizes.
2Force
If the pulling force is increased for thick branches, then the cutting capability is improved, but the accuracy of cutting deteriorates due to sudden force adjustments
Solution Approach 1:
The slidable pulley arrangement dynamically adjusts its position along the pole to modify the mechanical advantage ratio. For thick branches, the pulley moves to a position that provides higher mechanical advantage, delivering increased cutting force smoothly without sudden adjustments that would compromise accuracy.
Solution Approach 2:
The system changes the mechanical parameter (mechanical advantage ratio) by adjusting the pulley position. This allows the operator to select appropriate cutting force levels matching different branch diameters, maintaining cutting accuracy while achieving sufficient force for thick branches.
3Adaptability or versatility
If frequent adjustments in pulling force are made, then the adaptability to different branch sizes is improved, but the operator fatigue increases and productivity decreases
Solution Approach 1:
The dynamic pulley positioning system allows rapid adjustment between different cutting modes without requiring the operator to make frequent force adjustments. The operator simply moves the pulley to the appropriate position, and the system automatically provides the correct mechanical advantage for the branch size.
Solution Approach 2:
The slidable pulley arrangement serves itself by automatically adjusting the mechanical advantage ratio based on its position. Once positioned, the system self-regulates the cutting force without requiring continuous operator intervention or adjustment, reducing fatigue and maintaining productivity.
4Adaptability or versatility
If a slidable pulley arrangement with dual actuation handles is used, then the adaptability to different branch diameters is improved, but the device complexity increases
Solution Approach 1:
The slidable pulley arrangement with dual actuation handles serves multiple functions: it acts as a force multiplier for thick branches, a direct transmission mechanism for thin branches, and provides rapid mode switching capability. This multi-functionality justifies the increased complexity by eliminating the need for separate tools or mechanisms for different branch sizes.
Solution Approach 2:
The dynamic nature of the slidable pulley arrangement allows it to adapt its configuration based on the cutting task. The ability to slide and reposition the pulley along the pole transforms a potentially complex static mechanism into a dynamic, task-adaptive system that optimizes performance for each specific cutting scenario.
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 tool ensures accurate cutting with reduced operator fatigue and shorter pruning cycles by maintaining consistent pulling force across varying branch diameters and orientations, enhancing operational efficiency.
Implementation Method 1
a slidable pulley arrangement slidably disposed with respect to the elongated pole and wherein a sliding movement of the slidable pulley arrangement is configured to actuate the working implement
Implementation Method 2
The slidable pulley arrangement supports pull-cord passing around thereof and have a first end and a second end
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A slidable pulley arrangement (138, 228, 328, 428) slidably disposed with respect to the elongated pole (104, 204, 304, 404) of a pruning tool (100, 200, 300, 400) along with a first actuation handle (152, 250, 350, 340, 436) and a second actuation handle (154, 252, 352, 341, 438). A sliding movement of the slidable pulley arrangement (138, 228, 328, 428) is configured to actuate a working implement (102, 202, 302, 402) associated with the pruning tool (100, 200, 300, 400). A pull-cord (146, 244, 344, 362, 430) passing around the slidable pulley arrangement (138, 228, 328, 428) have a first end (148, 246, 346, 364, 432) attached to the first actuation handle (152, 250, 350, 340, 436) and a second end (150, 248, 348, 366, 434) attached to the second actuation handle (154, 252, 352, 341, 438). During a cutting action performed by pulling the first actuation handle (152, 250, 350, 340, 436) the second actuation handle (154, 252, 352, 341, 438) is configured to move along with the first actuation handle (152, 250, 350, 340, 436), and during a cutting action performed by pulling the second actuation handle (154, 252, 352, 341, 438) the second actuation handle (154, 252, 352, 341, 438) is configured to move while the movement of the first actuation handle (152, 250, 350, 340, 436) is restricted.