Hand Mixer Dual-Switch Control to Prevent Accidental Startup
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Solution Overview
Problem
Existing electric-motor kitchen appliances, such as hand mixers, pose a risk of accidental activation due to unintended switch pressing, which can lead to user injury from unguarded rotating blades.
Innovation Solution
Incorporating a finger-actuated electric control with a separate safety switch that requires intentional actuation by a user, featuring a time-integration circuit to ensure the on/off switch is only unlocked after a deliberate and prolonged action, thereby preventing accidental startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple on/off switch is used, then the ease of operation is improved, but the safety is worsened due to risk of accidental activation
Solution Approach 1:
The switching function is segmented into two separate switches: a safety switch and an on/off switch. This segmentation prevents accidental activation by requiring intentional actuation of both switches, while maintaining ease of operation through simple finger-actuated mechanisms.
Solution Approach 2:
The safety switch must be actuated first before the on/off switch becomes functional. This preliminary action ensures that the appliance cannot be accidentally activated, as the on/off switch remains blocked until the safety switch is deliberately pressed.
2Reliability
If two separate switches are used, then the safety is improved, but the device complexity is worsened
Solution Approach 1:
The control function is divided into two simple switches rather than one complex switch with multiple functions. Each switch has a single, clear purpose, making the overall system easier to understand and operate despite having two components.
Solution Approach 2:
The safety function is extracted as a separate switch from the on/off function. This extraction simplifies each individual switch's design while achieving enhanced overall safety through their combination.
3Ease of operation
If the safety switch is placed close to the on/off switch, then the ease of operation is improved, but the risk of simultaneous pressing is worsened
Solution Approach 1:
The safety switch is positioned in a recessed location with different spatial characteristics than the on/off switch. This local quality difference in positioning and accessibility prevents simultaneous pressing while maintaining ease of operation through finger actuation.
Solution Approach 2:
The switches are arranged in different spatial dimensions and orientations. The safety switch is recessed while the on/off switch is more accessible, creating dimensional separation that prevents simultaneous activation while allowing sequential operation.
Data Source
AI summary
An electric-motor kitchen appliance, in particular an electric-motor handheld device, preferably a hand mixer, includes a switch. The invention also relates to a finger-actuated electric control for the switch, and to a method for switching on/off a kitchen appliance. The switch is unlocked when the safety switch is actuated by the finger of a user. The safety switch is electronically switched. The possibility of unintentionally operating the electric-motor of the kitchen appliance is reduced due to the manual operation of the two separate switches. As a result, the safety of the electric-motor kitchen appliance in the household is significantly increased.