Garden Shears with Adjustable Pivot for Torque Control
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Solution Overview
Problem
Conventional garden shears require significant operating strength, making them difficult for users to maneuver effectively.
Innovation Solution
The design incorporates two cutting members with a main pivot aperture, a blade portion, pushing and sliding arcs, a protrusion, and an adjustable slot, along with applying arms featuring a driving pivot aperture, rotation portion, and handle, allowing for reduced strength requirements by generating a rotatable pushing force and increasing torque when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional garden shears with simple pivot structure are used, then the device complexity is low, but the operating force required is high
Solution Approach 1:
The patent applies the dynamics principle by implementing an adjustable slot mechanism that allows the driving pivot aperture to move vertically during operation. This dynamic adjustment enables the pivot position to change based on cutting resistance, optimizing the torque arm length in real-time. When cutting resistance increases, the pivot moves to increase torque, thereby reducing the operating force required while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent employs parameter changes by allowing the pivot position parameter to vary during operation through the adjustable slot. The vertical movement of the driving pivot aperture changes the geometric parameters of the mechanism, specifically the perpendicular distance from the pivot to the force application point, thereby adjusting the torque parameter dynamically to reduce operating force requirements.
2Power
If fixed pivot position is used, then the device complexity is low, but the torque adjustment capability is poor
Solution Approach 1:
The adjustable slot mechanism transforms the fixed pivot position into a dynamic, movable pivot position. The driving pivot aperture can slide vertically within the slot, allowing the torque arm length to adapt dynamically to varying cutting conditions. This dynamic capability enables torque adjustment without requiring complex external adjustment mechanisms.
Solution Approach 2:
The mechanism exhibits self-service characteristics where the driving pivot aperture automatically moves to the appropriate position within the adjustable slot based on the cutting resistance encountered. The system self-adjusts the torque parameter through the vertical movement of the pivot, eliminating the need for manual intervention or complex control systems.
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
This configuration enables garden shears to be operated with less strength, providing effective cutting performance by distributing force efficiently and increasing torque during tougher cutting tasks.
Implementation Method 1
the pushing edge of the applying arm generates a rotatable pushing force on the pushing arc
Implementation Method 2
the driving pivot aperture moves downwardly in the adjustable slot to increase the torque for the blade portion
Data Source
AI summary
Garden shears includes two corresponding cutting members, two opposing applying arms and two assembling members. Each cutting member has a main pivot aperture at a middle section thereof, a blade portion above the main pivot aperture, a pushing arc and a sliding arc continuously disposed below the main pivot aperture and a protrusion disposed between the pushing arc and the sliding arc, and an adjustable slot at a lower section. Each applying arm has a driving pivot aperture at a middle section, an eccentric pivot aperture at a top section, a rotation portion corresponding to the sliding arc formed at a top edge, a pushing edge formed at a side of the rotation portion, an indentation formed between the rotation portion and the pushing edge, and a handle at a lower section; wherein the assembling member is a flat member and has at least one securing aperture.