Vacuum Cleaner Bag Holding Plate With Low-Force Wide Opening
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Solution Overview
Problem
Existing holding plates for vacuum cleaner filter bags face challenges in efficiently opening and closing due to strong bending forces at large angles, which hinder the operation of vacuum streams, and are prone to dirt accumulation and wear from impinging particles.
Innovation Solution
A holding plate design featuring a base plate with a closing element and a spring element arranged behind it, where the bending angle during opening is smaller than the opening angle, allowing for a weak bending force to facilitate wide opening even under weak vacuum streams, and positioning the spring element out of the airflow path to prevent dirt accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leaf spring with strong bending force is used to close the through opening, then the closing function is improved, but the opening operation becomes difficult especially under weak vacuum streams
Solution Approach 1:
The spring element is pre-loaded to provide a closing force that keeps the closing element sealed against the base plate. The pre-load is designed such that the spring element only engages when the closing element is in the closed position, and disengages when opened, providing closing reliability without obstructing opening operation.
Solution Approach 2:
The spring element is extracted from the airflow path by positioning it behind the closing element. This separation removes the source of bending force from the vacuum stream, eliminating dirt accumulation on the spring while maintaining the closing function through the spring's engagement with the closing element.
2Reliability
If a tension spring is positioned in the airflow path to provide closing force, then the closing function is improved, but dirt accumulation and wear increase
Solution Approach 1:
The spring element is extracted from the airflow path by positioning it behind the closing element. This separation removes the source of bending force from the vacuum stream, eliminating dirt accumulation on the spring while maintaining the closing function through the spring's engagement with the closing element.
Solution Approach 2:
The closing element acts as an intermediary between the spring element and the airflow path. The spring element applies force to the closing element, which then performs the sealing function against the base plate, isolating the spring from direct exposure to dirt and particles in the vacuum stream.
3Reliability
If the spring element is arranged to provide strong closing force, then the sealing function is improved, but the bending force required for opening increases
Solution Approach 1:
The spring element is pre-loaded to provide a closing force that keeps the closing element sealed against the base plate. The pre-load is designed such that the spring element only engages when the closing element is in the closed position, and disengages when opened, providing closing reliability without obstructing opening operation.
Solution Approach 2:
The spring element is designed with a specific engagement geometry that provides strong closing force when engaged, but allows easy disengagement when opening force is applied. The dynamic engagement and disengagement of the spring element with the closing element enables strong sealing during operation with minimal opening force requirement.
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 design enables reliable and wide opening of the through opening, even under weak vacuum streams, while minimizing dirt accumulation and wear, ensuring effective operation and longevity of the closing mechanism.
Implementation Method 1
a spring element arranged such that the bending angle of the spring element upon pivoting of the closing element in an opening direction from a first position, in which the through opening is closed, into a second position, in which the through opening is opened, in a predetermined pivoting angle range is smaller than the corresponding opening angle of the closing element, the closing element can be brought by a restoring force of the spring element in a direction opposite the opening direction from the second position into the first position
Data Source
AI summary
A holding plate for a vacuum cleaner bag is provided. The holding plate includes a base plate with an opening, a closing element pivotably arranged on the base plate, and a spring element having a bending angle (B) that upon pivoting of the closing element in an opening direction from a first position to a second position in which the opening is opened, in a predetermined pivoting angle range that is smaller than the corresponding opening angle (* α) of the closing element, wherein the closing element can be brought from the second position into the first position by the restoring force of the spring element in the direction opposite to the opening direction, and wherein the spring element is located behind the locking element in the opening direction.