Hose coupling for a vacuum cleaner
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Solution Overview
Problem
Existing hose couplings for electrical vacuum cleaners suffer from air leakage and inefficient vacuuming due to poor connection tightness, requiring adhesive substances or additional parts, and involve high screwing forces and production costs.
Innovation Solution
A coupling device with a flap and rib structure that securely fastens a helical hose to the coupling element using a one-piece projection and latch system, allowing easy mounting verification and reducing production and mounting costs, while ensuring airtight connections with reduced screwing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive substances or additional parts are used to fasten the hose, then connection tightness is improved, but device complexity and production costs increase
Solution Approach 1:
The invention removes adhesive substances and additional fastening parts from the connection system. The hose is fastened solely through the mechanical interaction between the hose coupling's projection and the hose mounting projection, eliminating the need for adhesives or complex additional components while maintaining connection reliability.
Solution Approach 2:
The hose coupling system is designed to fasten the hose through its own structural features - the projection on the coupling engages with the mounting projection on the hose, creating a self-contained fastening mechanism that does not require external adhesives or additional fastening components.
2Device complexity
If traditional hose fastening methods are used, then device complexity is reduced, but air leakage occurs and vacuuming efficiency decreases
Solution Approach 1:
The invention applies local quality by creating a focused sealing interface at the projection engagement point between the hose coupling and hose mounting projection. This localized mechanical interlocking provides sufficient connection tightness without requiring complex overall device design, preventing air leakage at the critical connection point while keeping the rest of the device simple.
3Strength
If high screwing force is applied to mount the hose, then connection strength is improved, but mounting difficulty and production costs increase
Solution Approach 1:
The connection mechanism is segmented into discrete engagement features - the projection on the hose coupling engages with the mounting projection on the hose in a stepwise manner. This segmentation allows the hose to be mounted through simple insertion and engagement rather than requiring high screwing force, reducing mounting difficulty while maintaining connection strength through the mechanical interlock of the projected features.
Data Source
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AI summary
A coupling device (10) for coupling a helical hose (20) of a cleaning device comprising: a hose recess (16) for a helical hose (20), an inner wall (12) and an outer wall (13), wherein the inner wall (12) is equipped with one or more projections (11) for fastening the helical hose (20) and wherein the outer wall (13) comprising at least one coupling element (15), which is connected with the outer wall (13) after assembling. The present invention enables a hose coupling for coupling a helical hose where only two parts; hose and coupling device are connected together. The coupling device is easy to produce and it's also possible to create a secure and airtight connection between the hose and the coupling device. Additionally the production and mounting costs of such coupling device are reduced.