Detachable Lid Mechanism to Prevent Lifting of Self-Propelled Cleaners
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Solution Overview
Problem
Self-propelled working devices, such as vacuum cleaners, cannot detect when the lid is lifted or opened, allowing the device to be inadvertently lifted by gripping the lid, which can lead to accidental operation or damage.
Innovation Solution
The lid is designed with a detachable connection that separates from the housing when a predetermined pulling force is exceeded, preventing the device from being lifted by gripping the lid, and incorporating sensors to detect the lid's position and switch off the propelling drive when the lid is opened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lid is fixedly supported on the housing, then the operator can lift the working device by gripping the lid, but the working device can be accidentally lifted during operation
Solution Approach 1:
The lid is divided into a first part (lid body) and a second part (cover), connected by a detachable locking connection. The locking connection allows the lid to be securely fixed during normal operation but can be detached when lifting force is applied, preventing accidental lifting while maintaining ease of operation.
Solution Approach 2:
The locking connection is designed with specific mechanical parameters (locking depth, locking ramps, arm configuration) that allow it to withstand normal operational forces but detach when a predetermined pulling force is exceeded. This parameter optimization enables the lid to transition between fixed and detached states based on applied force.
2Reliability
If the lid is made detachable to prevent lifting, then accidental lifting is prevented, but the lid may accidentally detach during operation
Solution Approach 1:
The locking connection is pre-configured with locking elements and locking rims that automatically engage when the lid is closed, creating a secure connection before operation begins. The springy support of the arm ensures the locking element maintains continuous contact with the locking rim, preventing accidental detachment.
Solution Approach 2:
The locking ramps are designed with curved surfaces that guide the locking element into the locked position and maintain engagement through arc-shaped contact paths. This curvature provides smooth engagement and disengagement while maintaining stable locking during normal operation.
3Stability of the object's composition
If the locking connection is made strong to prevent detachment, then lid stability is improved, but the lid cannot be detached when lifting force is applied
Solution Approach 1:
The locking connection transitions from a static strong connection to a dynamic system where the arm is supported in a springy fashion. This allows the locking element to maintain firm engagement during normal operation but automatically release when lifting force exceeds the spring's compensating capability, achieving both stability and lifting prevention.
4Reliability
If sensors are added to detect lid position, then operational safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic sensor systems with a simple mechanical detection system using the sensor that detects the pivot position of the lid. This mechanical approach provides reliable operational safety by detecting lid opening and closing positions without requiring complex electronics, thereby minimizing device complexity.
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
Prevents accidental lifting of the device while maintaining stability and preventing damage, ensuring the device operates safely and efficiently by detecting the lid's position and adjusting the pulling force to prevent lifting.
Implementation Method 1
The first part is advantageously supported in a springy fashion so as to be loaded in the direction of the open position of the lid. When the second part is detached from the first part, the first part advantageously moves by spring action into its open position.
Data Source
AI summary
A self-propelled working device is provided with a housing and a pivot bearing arranged on the housing. At least one operating element is arranged on the housing. At least one lid is pivotably supported on the housing and is provided with a bearing section interacting with the pivot bearing. The at least one lid has a closed position and covers in the closed position the operating element. The lid has a first part and a second part connected to the first part. The bearing section is formed on the first part of the lid. The second part of the lid covers the operating element. When a constructively predetermined pulling force is applied to the second part, the second part detaches from the first part.