Rack-Type Telescopic Handle for Horticultural Shears
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Solution Overview
Problem
Traditional horticultural shears with fixed handles are inconvenient and unsafe for cutting or trimming branches at higher positions, and existing telescopic handles have complex structures and are not user-friendly.
Innovation Solution
A rack-type telescopic handle system with a movable gear and rack that can be engaged or separated using a control device, allowing adjustable length, featuring a casing, driving push-button, guide bases, and a position restoring spring for easy and secure length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If telescopic handles are used to adjust handle length for higher position cutting, then adaptability is improved, but device complexity increases
Solution Approach 1:
The handle is divided into a fixed handle and a movable handle that can slide relative to each other. The movable handle includes a gear that engages with a rack on the fixed handle, creating segmented functional zones for telescoping and locking operations.
Solution Approach 2:
The control device incorporates a spring mechanism that automatically restores the driving push-button to its initial position after engagement. The spring-driven system provides self-service by automatically resetting the locking mechanism without requiring manual intervention.
2Adaptability or versatility
If conventional telescopic handle mechanisms are implemented, then handle length adjustability is improved, but ease of operation deteriorates due to complicated control
Solution Approach 1:
The control mechanism is extracted as a separate, integrated unit within the handle assembly. The driving push-button and gear system are positioned to be easily accessible and operable by the user's thumb or finger, separating the control function from the structural components.
Solution Approach 2:
The driving push-button serves as an intermediary element between the user's input force and the gear engagement mechanism. This intermediary translates simple linear button pressure into rotational gear movement, mediating the control action in a user-friendly manner.
3Device complexity
If fixed handle length is used for traditional horticultural shears, then device complexity is reduced, but adaptability for different cutting heights deteriorates
Solution Approach 1:
The handle transitions from a static fixed-length design to a dynamic telescopic structure. The movable handle can slide along the fixed handle and lock at different positions, providing variable length adaptation while maintaining structural simplicity through the rack-and-gear locking mechanism.
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
Enables convenient and adaptable length adjustment of horticultural shears, ensuring user safety and ease of use while allowing for different application requirements, with a simple and user-friendly design.
Implementation Method 1
a position restoring spring installed between the pressing portion and the casing
Data Source
AI summary
A rack type telescopic handle of horticultural shears includes a fixed handle with a rack, a movable handle sheathed on the fixed handle, and a control device installed at an end of the movable handle, a movable gear pivotally coupled to the control device, and the control device controls an engagement and a separation of the movable gear with the rack, so that the movable handle can slide to an appropriate position on the fixed handle before the movable handle is fixed to the fixed handle so as to adjust the length of the handle of the horticultural shears.