Brush Vacuum Main Switch With Mechanical Overload Trip
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Solution Overview
Problem
Existing brush vacuum cleaners face complexity and cost issues in ensuring long-term stability and operational reliability during overload conditions, particularly when using a single motor for both the blower and brush drive, requiring additional electronic controls and switches.
Innovation Solution
A spring-loaded control element actuates an internal electrical switch, which latches in the clamped position and can be externally controlled for overload shutdown, using a torque sensing unit to release a mechanical trip element and adjust the switch position from an on to an off state, allowing for independent mechanical switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic controls and microcontrollers are used for overload detection and shutdown, then operational reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electronic control systems with a purely mechanical overload protection mechanism. A spring-loaded control element with a trip element mechanically detects torque threshold exceedance through a torque sensing unit, automatically actuating the electrical switch without microcontrollers or electronic sensors, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
The mechanical system is self-actuating through the spring-loaded control element that automatically trips when torque exceeds the threshold. The mechanism uses the physical torque itself to activate the shutdown through the torque sensing unit and trip element, eliminating the need for external electronic monitoring systems
2Reliability
If additional electronic switches and controls are added for overload protection, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs simple, inexpensive mechanical components such as spring-loaded control elements, trip elements, and torque sensing units instead of costly electronic control systems. These mechanical parts are straightforward to manufacture and replace, reducing both initial manufacturing cost and long-term maintenance expenses while providing reliable overload protection
3Device complexity
If a single motor is used for both blower and brush drive, then device simplicity is improved, but overload protection becomes more complex
Solution Approach 1:
The mechanical overload protection mechanism serves the entire dual-function motor system through a single torque sensing unit that monitors the combined torque demands of both the blower and brush drive. The spring-loaded control element provides unified overload protection for the single motor, eliminating the need for separate protection systems for each function
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 the shutdown process by enabling mechanical switching for overload conditions without additional electronic controls, ensuring reliable operation and reducing complexity and costs.
Implementation Method 1
a movable, spring-loaded control element actuates an electrical switch
Implementation Method 2
the torque sensing unit controls a mechanical trip element
Data Source
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AI summary
For a brush vacuum cleaner with a safety shutdown of the drive via torque detection of the brush roller in the event of an overload, it is provided that a mechanical triggering element actuates an electrical switch for the main switch for switching off the drive above a torque threshold by means of transmission elements. In this case, the switch is additionally connected in parallel by an external actuating element with an on and off position by a spring-loaded control element and a coupling element, with the spring-loaded control element being able to adjust the switch position of the switch to an off position when the actuating element is switched off due to overload. The on and off position of the main switch can be adjusted in parallel using the actuating element. The control element is held in the on position by the associated spring in an arrangement for latching the control element, with unlocking being adjustable as the off position by adjusting the control element via the actuating element against the pressure of the spring.