Tree Pruner Rotating Wheel Mechanism for Compact Cutting
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Solution Overview
Problem
Conventional tree pruners have large packaging volumes, inefficient cutting due to long arm portions that are easily disturbed by surrounding branches, and inconsistent force application during operation, leading to reduced cutting efficiency and smoothness.
Innovation Solution
A tree pruner design featuring a rotating wheel connected to a pull member and a pull rod, which reduces packaging volume and minimizes swing radius interference, allowing for consistent force application and improved cutting efficiency by using a strap-like pull member to drive the rotating wheel and blade for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the arm portion of the blade is lengthened to ensure labor-saving operation, then the cutting force is improved, but the packaging volume becomes too large
Solution Approach 1:
The blade is nested within the blade seat structure, with the blade being insertable and removable from the blade seat. This allows the blade to be stored compactly within the overall pruner structure when not in use, significantly reducing the packaging volume while maintaining the necessary arm length for effective cutting operation.
2Force
If the arm portion of the blade is lengthened to achieve labor-saving operation, then the cutting force is improved, but the swing radius is disturbed by surrounding branches reducing cutting efficiency
Solution Approach 1:
The blade is designed to be pivotally connected to the blade seat, allowing dynamic adjustment of the blade position and swing radius according to the working conditions. The blade can rotate relative to the blade seat, enabling the user to adapt the swing radius to avoid surrounding branches while maintaining effective cutting force.
3Force
If the arm portion of the blade is lengthened for labor-saving operation, then the cutting leverage is improved, but the operation becomes unsmooth as the user's arm must gradually extend outwardly
Solution Approach 1:
The blade seat acts as an intermediary between the user's pulling action and the blade movement. The blade seat is pivotally connected to both the connecting pole and the blade, mediating the force transmission and enabling smooth rotational movement of the blade without requiring the user's arm to gradually extend outwardly during operation.
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 design achieves labor-saving, efficient cutting with reduced packaging volume, minimizes branch interference, and ensures consistent force direction, enhancing overall cutting efficiency and smoothness.
Implementation Method 1
The rotating wheel is rotatable relative to the main body by pulling the pull member. One end of a pull rod is pivotally connected to the traction portion. Another end of the pull rod is pivotally connected to the drive portion. By pulling the pull member, the rotating wheel is driven to rotate, and the pull rod is pulled to drive the cutting edge of the blade to swing for performing cutting.
Implementation Method 2
The blade has a cutting edge extending toward the blade seat and a drive arm extending outwardly. A distal end of the drive arm is formed with a drive portion. By pulling the pull member, the rotating wheel is driven to rotate, and the pull rod is pulled to drive the cutting edge of the blade to swing for performing cutting.
Data Source
AI summary
A tree pruner has a connecting pole. The connecting pole is connected with a main body. The main body includes a blade seat and a blade pivotally connected to the blade seat. The main body is pivotally connected with a rotating wheel. The rotating wheel is connected with a pull member. The rotating wheel is rotatable relative to the main body by pulling the pull member. An end surface of the rotating wheel has a traction portion located away from a pivot axis of the rotating wheel. The blade has a drive arm extending outwardly. One end of a pull rod is pivotally connected to the traction portion. Another end of the pull rod is pivotally connected to the drive arm. By pulling the pull member, the rotating wheel is driven to rotate, and the pull rod is pulled to drive the blade to swing for performing cutting.