Mechanical Safety Switch for Gardening Devices
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Solution Overview
Problem
Existing safety switches for gardening devices, such as robotic lawn mowers, face malfunctions due to moisture and dirt exposure, leading to costly and time-consuming replacements, and fail to meet new legal requirements for a dual-action sequential start procedure.
Innovation Solution
A fully mechanical safety switch with a main button arrangement and a sub button arrangement that pivots between arrest and energize positions, utilizing a coil spring biasing mechanism to ensure two distinct actions are required for motor activation, preventing unintentional starting and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronic start button is used to meet dual-action requirements, then the legal requirement for two different sequential actions is fulfilled, but the device malfunctions easily when moisture and dirt are squeezed into the electronic circuits
Solution Approach 1:
The patent replaces the electronic button system with a purely mechanical safety switch system. The mechanical system uses a main button that can pivot between first and second positions, and a sub button that slides between arrest and energize positions. This mechanical substitution eliminates electronic circuits that are vulnerable to moisture and dirt, while still achieving the required dual-action sequential operation through mechanical movements and biasing means.
2Adaptability or versatility
If an electronic display with multiple buttons is used, then the dual-action requirement is met, but the whole electronic display including cabling needs to be replaced when malfunction occurs
Solution Approach 1:
The patent segments the safety switch into distinct mechanical components: a main button arrangement that pivots and a sub button arrangement that slides. These segmented mechanical parts can be independently manufactured, assembled, and replaced. When malfunction occurs, only the specific faulty mechanical component needs replacement rather than the entire electronic display system, reducing repair costs and time.
3Ease of operation
If a single action start switch is used, then the operation is simple, but it does not meet the new legal requirements for dual-action sequential start procedure
Solution Approach 1:
The patent implements a dynamic mechanical system where the main button can pivot between first and second positions, and the sub button can slide between arrest and energize positions. The biasing means provides dynamic restoring forces. This dynamic mechanical design enables the dual-action sequential operation required by law while maintaining relative operational simplicity through intuitive mechanical movements.
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 mechanical safety switch reduces manufacturing and repair costs, facilitates easier maintenance, and ensures compliance with dual-action start requirements while maintaining reliability in various weather conditions.
Implementation Method 1
The sub button arrangement (4) comprises biasing means (13) by means of which biasing means the sub button arrangement (4) is biased towards the arrest position in the first position
Data Source
AI summary
Safety switch for a gardening device driven by a motor. The safety switch includes a main button arrangement and a sub button arrangement which is provided onto the main button arrangement. The main button arrangement may pivot between a first position and a second position. In the first position the sub button arrangement may be provided in an arrest position and in the second position the sub button arrangement is arranged in an energize position. Further, the sub button arrangement includes biasing means by means of which biasing means the sub button arrangement is biased towards the arrest position in the first position, and by application of an external force the sub button arrangement may be moved towards a biasing force exerted by the biasing means and be slid to the energize position where the main button arrangement may activate the power means in the second position.