Hedge Trimmer Rotary Unlocking Trigger and Microswitch Interlock
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Solution Overview
Problem
Traditional hedge trimmers are inconvenient to use for cutting surfaces at different angles due to their fixed structure, leading to potential accidents during high-speed reciprocating trimming, and they primarily adapt to simple horizontal surface cutting.
Innovation Solution
A hedge trimmer design where the rear machine body can rotate relative to the front machine body, featuring a rotary unlocking trigger and microswitch that disconnects the power supply when the trigger is activated, allowing for safe and easy switching between cutting orientations and preventing accidental start-ups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rear machine body is made rotatable to enable cutting at various angles, then the adaptability and ease of operation are improved, but the safety is worsened due to potential accidental start-ups during high-speed reciprocating trimming
Solution Approach 1:
The patent applies the dynamics principle by making the rear machine body rotatable relative to the front machine body, allowing the cutting angle to be dynamically adjusted between 0度和90度. This dynamic structure enables the tool to adapt to different cutting orientations while maintaining safety through the interlock mechanism that prevents operation during rotation.
Solution Approach 2:
The patent uses an interlock mechanism as an intermediary between the rotary triggering mechanism and the motor starting mechanism. This intermediary component (the interlock structure) prevents the motor from starting when the rear machine body is in a rotatable state, thereby eliminating the harmful effect of accidental start-ups while preserving the rotational functionality.
2Ease of operation
If the rear machine body is made rotatable to change usage state, then the ease of operation is improved, but the device complexity increases due to additional locking and triggering mechanisms
Solution Approach 1:
The patent merges the locking mechanism and the triggering mechanism into a single integrated rotary unlocking trigger assembly. The lock pin, lock hole, and microswitch are combined in one structure that performs both locking/unlocking and circuit control functions, reducing overall device complexity while maintaining ease of operation.
Solution Approach 2:
The rotary unlocking trigger serves multiple functions: it acts as a lock pin for mechanical locking, a triggering mechanism for unlocking, and a circuit switch for motor control. This multi-functionality reduces the need for separate components, thereby simplifying the overall device structure while improving operational ease.
3Device complexity
If the fixed structure is used to maintain simplicity, then the device complexity is reduced, but the adaptability to different cutting surfaces deteriorates
Solution Approach 1:
The patent transitions from a fixed structure to a dynamic structure where the rear machine body can rotate relative to the front machine body. This dynamic capability allows adaptation to different cutting surfaces (horizontal, vertical, oblique) while maintaining relatively simple structure through the use of a straightforward rotary connection mechanism.
Data Source
AI summary
The present application relates to a hedge trimmer. A rear machine body can rotate relative to a front machine body. The rear machine body includes a rotary unlocking trigger and a microswitch disposed on one side of the rotary unlocking trigger. The microswitch is a normally closed switch and is electrically connected to a power supply circuit. The rotary unlocking trigger has a first position and a second position relative to the front machine body. In response to the rotary unlocking trigger is at the first position, the rear machine body is fixed relative to the front machine body, and the power supply circuit is conducted; in response to the rotary unlocking trigger is at the second position, the rear machine body rotates relative to the front machine body, and the power supply circuit is disconnected.