Foldable Garden Tool Push Rod Locking With Position Sensing
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Solution Overview
Problem
Existing rod mechanisms for garden tools, such as lawn mowers, are complex and time-consuming to operate, and complicate packaging due to intricate locking designs, which hinder convenience and efficiency.
Innovation Solution
A simplified rod mechanism with a pivotally connected first rod and a movably connected second rod, featuring an actuator and locking component that can be unlocked by pressing the second rod, allowing for easy switching between in-use and storage positions, and incorporating a position sensor to prevent accidental startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotatable locking mechanism with locking nut is used to lock the upper rod, then the rod can be locked securely, but the operation becomes complex and time consuming
Solution Approach 1:
The locking mechanism is segmented into a locking component on the first rod and a corresponding locking structure on the main body. The locking component can be independently actuated by the second rod, separating the locking function from complex rotational operations. This segmentation allows simple linear movement to achieve locking/unlocking while maintaining secure engagement.
Solution Approach 2:
The second rod serves as an intermediary actuator that triggers the locking component. Instead of directly operating complex locking nuts, the second rod translates simple pushing motion into locking component actuation. This intermediary mechanism simplifies user interaction while ensuring reliable locking through the locking component's engagement with the main body.
2Reliability
If a second locking component is provided between the lower rod and rod base, then the locking function is enhanced, but the product size increases and packaging becomes inconvenient
Solution Approach 1:
The locking component on the first rod serves multiple functions: it locks the first rod to the main body, and through actuation by the second rod, it also controls the folding/unfolding of the rod assembly. This multi-functionality eliminates the need for separate locking components on the lower rod and rod base, reducing overall product volume while maintaining enhanced locking capability.
Solution Approach 2:
The locking functions for both the upper and lower rod connections are merged into a single locking component system. The locking component on the first rod, when actuated, simultaneously secures both connection points through its interaction with the main body's locking structure. This consolidation reduces the number of parts and minimizes product volume for packaging.
3Object-affected harmful factors
If the rod extends toward the back for a certain length during work, then the operator works at a safe distance, but the stored volume increases when not in use
Solution Approach 1:
The rod assembly is designed with dynamic positioning capability through the locking mechanism. The first rod can be locked in an extended position during work to maintain safe operator distance, and locked in a folded position during storage to minimize volume. The ability to dynamically change the rod's position and lock it in different states allows the system to optimize both safety and storage efficiency at different operational phases.
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 solution simplifies operation, facilitates convenient packaging, reduces costs, and enhances safety by ensuring the machine cannot be started when in the storage position, thereby improving user safety and reducing the risk of incorrect operation.
Implementation Method 1
The elastic member is connected to a lower end of the sliding member for the sliding member to have an upwardly moving tendency
Data Source
Figure 1~2-1
Figure 2-2~3
Figure 4~5
AI summary
A push rod mechanism for a garden tool and a garden tool with said mechanism. The push rod mechanism (2) for the garden tool comprises a first push rod (21). The first push rod (21) is pivotally connected to a rear part of a main body of the garden tool and can be locked at least when rotated to an in-use position or to a stored position. An actuator and a locking component are provided at the first push rod (21). The push rod mechanism (2) also comprises a second push rod (22) movably connected to the first push rod (21). The second push rod (22) can trigger or release the actuator when moved to a preset position. The main body of the garden tool is provided with a position sensor. The position sensor is used to generate a sensing signal when the first push rod rotates to the in-use position or to the stored position. When the second push rod (22) is pressed, the push rods can be unlocked or locked, achieving position limiting after the push rods have been folded for convenient prototype packaging, thereby reducing costs. The main body of the garden tool is provided with the position sensor, preventing accidental start-up of machinery and improving safety.