Telescopic Pole Pruner Pulley Drive for Low-Resistance Cutting
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Solution Overview
Problem
Conventional high branch scissors require significant physical strength and endurance for pruning thicker branches, leading to muscle fatigue and low efficiency due to high operating resistance.
Innovation Solution
The design incorporates a telescopic assembly with moving pulleys and steel ropes, a scissors assembly with rotating discs and gears, and a handle mechanism that reduces operating resistance and ensures stable, efficient pruning by transmitting force effectively through interconnected components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional high branch scissors with nylon rope are used for pruning thicker branches, then the pruning function is achieved, but significant physical strength and endurance are required, leading to muscle fatigue and low efficiency
Solution Approach 1:
A steel cable is introduced as an intermediary force transmission medium between the user's pulling action and the blade closing mechanism. The steel cable replaces the direct mechanical connection, allowing force to be transmitted over the telescopic extension while reducing the effort required at the handle end through the mechanical advantage provided by the pulley system.
Solution Approach 2:
The scissors incorporate a telescopic assembly with movable pulleys that dynamically adjust the mechanical advantage during operation. As the steel cable is pulled, the pulleys move along the rod, changing the leverage ratio to optimize the force multiplication effect throughout the pruning stroke, thereby reducing user fatigue while maintaining high productivity.
2Duration of action of moving object
If conventional high branch scissors are used for prolonged pruning, then continuous pruning operation is maintained, but user muscle fatigue and soreness occur due to continuous output of great force
Solution Approach 1:
The steel cable acts as a force transmission intermediary that decouples the user's muscular effort from the actual blade closing force. This allows prolonged operation without direct transmission of muscular fatigue to the cutting action, enabling continuous pruning duration to be extended while maintaining ease of operation through the cable-mediated force transfer.
Solution Approach 2:
The dynamic pulley system continuously adjusts mechanical advantage during each pruning cycle and throughout prolonged operation. This dynamic adaptation optimizes force requirements at different stages of the pruning process, reducing cumulative muscle fatigue and enabling longer continuous operation without excessive physical burden on the user.
3Strength
If thicker branches are pruned using conventional high branch scissors, then successful pruning of thick branches is achieved, but large force and repeated attempts are needed, resulting in laborious process
Solution Approach 1:
The steel cable serves as a force amplification intermediary that converts modest user pulling force into substantial blade closing force capable of cutting thick branches. This intermediary mechanism eliminates the need for repeated attempts by providing sufficient cutting strength in a single pull, thereby maintaining operational simplicity while achieving successful pruning of thick branches.
Solution Approach 2:
The movable pulleys create a dynamic mechanical advantage system that automatically provides the necessary force multiplication for thick branch cutting. As the user pulls the handle, the pulleys adjust to maximize force transmission efficiency, enabling single-attempt cutting of thick branches without requiring the user to apply excessive force or make repeated laborious attempts.
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 improved design reduces operating resistance, enhances pruning efficiency, and alleviates user burden by allowing for easy operation and automatic resetting of the scissors, ensuring smooth and stable branch cutting.
Implementation Method 1
A second moving pulley is movably arranged in the first mounting block, and a first moving block is movably arranged inside the second long rod shell. A first moving pulley and a third moving pulley are movably arranged in the first moving block.
Implementation Method 2
The first steel rope is arranged in the second long rod shell, and the head portion of the first steel rope is arranged on the second fixing block. The first steel rope penetrates through the third fixing sleeve along the first long rod shell and then penetrates through a square hole in the second long rod shell on one side of the third fixing sleeve.
Implementation Method 3
The first rotating shaft is provided with a first gear, and the first gear abuts between the first hexagonal shaft sleeve and the second hexagonal shaft sleeve. The first gear is engaged with a gear scissors blade.
Data Source
AI summary
High branch scissors comprising a first long rod shell, wherein a first fixing sleeve is arranged at a tail portion of the first long rod shell, a handle is slidably arranged on the first long rod shell, a telescopic assembly is arranged in the first long rod shell, and a scissors assembly is arranged at the top of the telescopic assembly. The interaction between the moving pulleys and the first steel rope reduces the operating resistance when pruning. The operation of scissors assembly is capable of being controlled by means of the handle. The first gear and the gear scissors blade are engaged and the second scissors blade is movably connected to the gear scissors blade through a bolt, thereby achieving the shearing function of the scissors assembly. Through adopting the present invention, a large force is transmitted during pruning, and the efficiency is improved.