Vacuum Cleaner Nozzle Pivot Assembly for Reduced Suction Lock
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Solution Overview
Problem
Conventional upright vacuum cleaners face difficulties in operation due to high operating forces required to move the device over dense carpets, primarily due to suction lock and friction, and often have complex and costly handle lock mechanisms that are prone to breakage and misinterpretation.
Innovation Solution
The design features a pivotally mounted inlet nozzle assembly that can float independently of the carriage, reducing suction lock by allowing the suction inlet to lift off the carpet, and an integral storage lock system using a resilient crossbeam and protrusion for secure upright positioning without additional springs or pedals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the suction inlet is kept in fixed contact with the carpet to maintain cleaning effectiveness, then cleaning performance is improved, but operating force increases due to suction lock and friction
Solution Approach 1:
The inlet nozzle assembly is made dynamically movable relative to the carriage through a pivot connection, allowing it to float and rotate independently. This dynamic configuration enables the suction inlet to maintain optimal contact with the carpet surface while reducing suction lock and friction during operation, thereby decreasing operating force without compromising cleaning effectiveness.
2Reliability
If a robust handle lock mechanism is used to securely hold the handle in upright position, then stability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The handle lock mechanism is merged with the handle assembly itself, forming an integral storage lock system. The resilient crossbeam and protrusion are incorporated directly into the handle structure, eliminating the need for separate lock components, springs, and pedals. This integration maintains reliable handle stability while significantly reducing device complexity and manufacturing cost.
Solution Approach 2:
The handle lock mechanism operates through self-service action where the resilient crossbeam automatically engages with the protrusion to lock the handle in upright position. The system uses the handle's own weight and position to activate the locking action, eliminating the need for external springs, pedals, or complex actuation mechanisms.
Data Source
AI summary
A vacuum cleaner having a handle, a dirt separator and suction motor on the handle, and a nozzle. An elongated suction inlet passes through the bottom face of the nozzle, and a pivot joins the nozzle to the handle at a pivot axis that extends parallel to the elongated suction inlet. The pivot includes first and second pivot connections joining the base to either side of the handle. A base air passage extends from the suction inlet to the first pivot connection, and is fluidly connected, through the first pivot connection, to a first handle air passage located in the handle and extending from the first pivot connection to an inlet of the separator. A second handle air passage located in the handle extends from the separator outlet to the suction motor inlet.