Telescopic Pruner Internal Pulling Mechanism for Smooth Length Adjustment
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Solution Overview
Problem
Existing telescopic hand tools with pull cords or bands are often visible and require manual adjustment, leading to operational complexity and potential frictional resistance during length adjustment.
Innovation Solution
A telescopic hand tool design with at least three tubes and a pulling mechanism arranged substantially inside the tool, utilizing deflection pulleys and a groove system to automatically adapt the pulling means' length, minimizing friction and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pulling means is arranged outside the tube, then the structure is simple, but the pulling means is visible and requires manual adjustment leading to operational complexity
Solution Approach 1:
The pulling means is nested inside the telescopic tubes, with the pull cord running through the grooves of the outer tube and intermediate tube. This nesting conceals the pulling means from view while integrating it into the telescopic mechanism, eliminating the need for external manual adjustment and reducing operational complexity.
Solution Approach 2:
Grooves are introduced as intermediary elements formed along the tubes to guide and constrain the pulling means. These grooves mediate between the pulling means and the tube structure, enabling the pulling means to move smoothly inside the tubes while maintaining structural integrity and simplifying operation.
2Adaptability or versatility
If the pulling means length is fixed, then the structure is simple, but the pulling means cannot automatically adapt to tube length changes causing frictional resistance
Solution Approach 1:
The pulling means is designed with dynamic length adjustment capability through the telescopic mechanism. As the tubes extend or retract, the pulling means automatically adjusts its effective length through the grooves and deflection pulleys, eliminating frictional resistance and maintaining adaptability without requiring complex additional components.
Solution Approach 2:
The telescopic hand tool automatically adjusts the pulling means length based on the tube configuration without external intervention. The system serves itself by using the tube movement to naturally adjust the pulling means, eliminating the need for separate adjustment mechanisms and reducing overall device complexity.
3Length of moving object
If three tubes are used, then a small minimum length and large maximum length are achieved, but the pulling means arrangement becomes complex
Solution Approach 1:
The pulling means is segmented into multiple portions (first portion, second portion, third portion) that are distributed across different tubes and deflection pulleys. This segmentation allows the pulling means to be efficiently arranged within the three-tube configuration, achieving the desired length range while distributing complexity across multiple manageable sections rather than a single complex arrangement.
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 allows for easy operation with reduced manual force and protects the pulling mechanism from damage, while maintaining a compact storage length and extended operating length.
Implementation Method 1
minimizing friction and visibility
Implementation Method 2
a hoist pulley slidable within the inner tube and connected to the tool head, wherein the hoist pulley is provided for redirecting the pulling means
Data Source
AI summary
A telescopic hand tool, particularly a telescopic pruner. The telescopic hand tool comprises an outer tube, at least one intermediate tube slidable within the outer tube and an inner tube slidable within the intermediate tube. At least one tool head is connected or connectable to the front end of the inner tube. A back handle is detachably arranged at the back end of the outer tube. A pulling means is arranged substantially inside the tubes, wherein one end of the pulling means is connected to the back handle, while another end of the pulling means is connected to a fixing point at the front end of the outer tube. A number of deflection pulleys are arranged at the back ends of the tubes and at the front ends of the outer tube and intermediate tube, wherein the deflection pulleys are provided for redirecting the pulling means.