Spring-Biased Hook Saw for Dense Branch Cutting
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Solution Overview
Problem
Conventional branch cutting tools face challenges such as difficulty in cutting thicker branches with shears, limited reach, fatigue from hand grip strength, and issues with dense branches, where saws can get caught or struggle to secure thin branches.
Innovation Solution
A branch cutting saw with a saw body and a sheath body that includes a hook section for hooking onto branches, allowing the saw blade section to be advanced and retreated to cut the branch, with a spring-biased hook and saw blade configuration to facilitate smooth cutting without fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shears are used to cut branches, then small branches can be cut, but it is difficult to cut thicker branches and the reach is limited
Solution Approach 1:
The cutting tool is divided into two distinct components: a sheath body for reaching and positioning, and a separate saw blade for cutting. This segmentation allows the sheath to be long enough to reach high branches while the saw blade provides the cutting capability for thicker branches that shears cannot handle.
Solution Approach 2:
The tool combines multiple functions into one device: the sheath body with hook section provides reaching and positioning capabilities, while the integrated saw blade provides cutting capability. This multi-functionality replaces the need for separate shears and saws, handling both small and thick branches with extended reach.
2Length of moving object
If saws are used to cut branches, then reach is extended and grip fatigue is reduced, but it is difficult to stop thin branch swinging and the exposed saw teeth can get caught on other branches
Solution Approach 1:
The hook section on the sheath body performs preliminary action by hooking onto the target branch before the saw blade makes contact. This preliminary hooking action secures the branch position and prevents swinging during the cutting operation, allowing precise control over thin branches that would otherwise be difficult to manage.
Solution Approach 2:
The sheath body acts as an intermediary between the operator and the branch. The hook section on the sheath securely engages the branch, providing a stable intermediate connection point that eliminates branch swinging and allows the operator to control the cutting process without direct hand grip on the thin branch.
3Adaptability or versatility
If the hook is provided separately off the extension direction of the support cylinder, then the hook can function, but the support cylinder and hook become bulky making it difficult to insert between dense branches
Solution Approach 1:
The hook section is nested within or integrated into the sheath body structure, with the hook pivotally supported at the leading end of the sheath. This nesting arrangement allows the hook to be contained within the overall profile of the sheath, creating a slim combined structure that can be easily inserted between dense branches while maintaining full hook functionality.
Solution Approach 2:
The hook section and sheath body are merged into a single integrated structure rather than being separate components. The hook is pivotally supported at the leading end of the sheath, combining the positioning function of the sheath with the hooking function of the hook section, resulting in a compact unified structure with reduced overall profile.
4Productivity
If the saw blade is kept exposed forward from the support cylinder during hook manipulation, then the saw is ready to cut, but the exposed saw blade gets in the way when hooking onto the branch
Solution Approach 1:
The saw blade is made dynamically positionable relative to the sheath body, allowing it to be advanced or retreated as needed. During hooking operations, the saw blade can be retreated to avoid interfering with the hook section, and during cutting operations, it can be advanced to the cutting position, providing operational flexibility without sacrificing cutting readiness.
Solution Approach 2:
The hook section performs preliminary action by hooking onto the branch first, positioning the sheath body correctly before the saw blade is advanced to the cutting position. This preliminary hooking action ensures the saw blade will be in the correct position for cutting without needing to be exposed during the hooking maneuver itself.
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 solution enables secure, smooth, and efficient cutting of branches from thin to thick, even in dense areas, reducing fatigue and improving reach, making it suitable for various branch sizes and environments.
Implementation Method 1
the hook section of the sheath body is pivotally supported at a leading end of the sheath body and is under spring bias to have a steady-state position in a longitudinal region of the sheath body, and is configured to be rotationally displaced from the steady-state position of the hook section when a load equivalent to or greater than the spring bias is applied against the spring bias
Implementation Method 2
the saw blade section of the saw body is under spring bias to have a steady-state position at a position where a tip end of the saw blade section is retreated from the hook section, and is configured such that the saw blade section is advanced from the steady-state position of the saw blade section when the grip section of the saw body is manipulated against the spring bias
Data Source
AI summary
A branch cutting saw is provided which can easily and reliably cut thin and thick branches, branches in places difficult to reach with shears, branches in dense areas, and the like. The branch cutting saw is for cutting a branch by hooking a hook section 22 onto the branch and advancing and retreating a saw blade section 11 while urging the branch toward the saw blade section 11. The hook section 22 is pivotally supported at a leading end of a sheath body 20 and is under spring bias to have a hook section steady-state position Fs in a longitudinal region Rf of the sheath body 20, and is configured to be rotationally displaced from the hook section steady-state position Fs when a load equivalent to or greater than the spring bias is applied against the spring bias. The saw blade section 11 of a saw body 10 is under spring bias to have a saw blade section steady-state position Ns at a position where a tip end of the saw blade section is retreated from the hook section 22, and is configured such that the saw blade section 11 is advanced from the saw blade section steady-state position Ns when the grip section of the saw body is manipulated against the spring bias.