Electric Pruner Trigger Contact for Wire-Free Safety Detection
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Solution Overview
Problem
Existing electric portable motorized pruners have ergonomic and safety issues due to external electrical connections that can interfere with the user and are prone to connection loss if the wire is caught or broken.
Innovation Solution
Integrating the contact terminal directly into the pruning shears, eliminating the need for an external wire, ensuring a more ergonomic design and reliable electrical contact through conductive elements on the pruner's body or actuating means, such as triggers or buttons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact terminal is connected to the operator's body through an external electrical wire, then the safety device can detect contact between the cutting tool and the operator's body, but the wire can obstruct the operator's view and may become entangled or broken causing loss of electrical contact
Solution Approach 1:
The patent merges the contact terminal with the pruner body itself, making the pruner body electrically conductive to serve as the contact terminal. This eliminates the external wire connection while maintaining the safety detection function, thereby resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The patent extracts and eliminates the external electrical wire from the system by integrating the contact function directly into the pruner body. This removes the harmful element (the wire that causes ergonomic issues) while preserving the essential safety detection capability.
2Reliability
If the contact terminal is connected through an external electrical wire, then the safety device can function, but there is a risk of electrical contact loss if the wire becomes entangled or broken
Solution Approach 1:
The patent combines the contact terminal function with the pruner body structure, eliminating the separate wire connection system. This reduces device complexity while improving reliability by removing the vulnerable wire component that could become entangled or broken.
Solution Approach 2:
The patent removes the external wire connection system entirely, extracting the problematic element that causes electrical contact loss. The safety function is maintained through the integrated conductive pruner body, simplifying the overall system.
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
Enhances user safety by ensuring consistent electrical contact and reducing the risk of injury from external wire interference or connection loss, providing a more ergonomic and safer handling experience.
Implementation Method 1
a module that measures an electrical quantity between these two terminals, such as a voltage of a given frequency, a current, or an impedance. When the operator touches the tool, this contact is detected based on the value of the measured quantity.
Data Source
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AI summary
The invention relates to a portable electric motorized pruner (200) comprising a cutting tool (204), a means (210) for actuating said cutting tool (204), in particular in the form of a trigger or a button, and a safety device (100) acting on the operation of said cutting tool (204) when said cutting tool (204) comes into electrical contact with the body of an operator holding the pruner, said safety device (100) comprising: - a terminal (102), referred to as the reference terminal, provided to be electrically coupled to said cutting tool (204); and - at least one terminal (104), referred to as the contact terminal, provided to be electrically coupled to the body of said operator; characterized in that at least one contact terminal (104) is provided on said actuating means (210).