Vacuum Cleaner Hose Handle Rotation Without Slip Rings
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Solution Overview
Problem
Existing handle arrangements for vacuum cleaner hoses require significant manufacturing effort and are prone to electrical connection faults due to the use of slip rings and slip ring contacts, which are difficult to maintain in dusty environments.
Innovation Solution
The electrical conductors from the hose are routed radially through an opening in the handle tube into a cavity of a handle part, forming a length supply loop, with a receiving space on the inner sleeve allowing for limited rotation without slip rings, and stops limiting the angle of rotation to prevent conductor kinking and overstretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slip rings and slip ring contacts are used to establish electrical connection between hose and handle assembly, then the handle assembly can be freely rotated by 360°, but the manufacturing effort increases considerably and the connection is prone to faults in dusty environments
Solution Approach 1:
The patent extracts and eliminates the slip ring assembly from the system. Instead of using complex slip rings and contacts, the invention uses simple electrical conductors that are routed through the handle tube and secured with adhesive tape. This removes the problematic component while maintaining the essential electrical connection function, thereby reducing manufacturing complexity and improving reliability.
Solution Approach 2:
The patent replaces the expensive and complex slip ring assembly with inexpensive, simple electrical conductors and adhesive tape. These simpler components are easier to manufacture, replace, and maintain, effectively treating the electrical connection as a disposable or easily replaceable element rather than a permanent, complex assembly.
2Ease of operation
If slip rings and slip ring contacts are used to establish electrical connection, then rotational movement is enabled, but the connection reliability decreases due to contamination in dusty atmospheres
Solution Approach 1:
The patent removes the slip ring contacts that are susceptible to dust contamination. By using simple conductors that pass through the handle tube and are secured with adhesive tape, the system eliminates the contact surfaces that would otherwise accumulate dust and degrade electrical connection reliability.
Solution Approach 2:
The electrical conductors are designed to be self-securing through adhesive tape application, eliminating the need for complex mechanical contact systems. The conductors naturally maintain their position and electrical connection without requiring precision-machined surfaces that are vulnerable to environmental contamination.
3Ease of manufacture
If electrical conductors are routed through the handle tube with limited rotation capability, then manufacturing effort is reduced, but the handling versatility is limited
Solution Approach 1:
The patent applies partial rotation capability (limited rotation angle) rather than full 360° rotation. The electrical conductors are routed and secured to provide sufficient rotation for typical vacuum cleaner handling operations, accepting that extreme rotation angles are not necessary for the intended application. This partial action approach simplifies manufacturing while meeting practical needs.
Data Source
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AI summary
The blocking device comprises at least one lock (1) for partial locking of the section join (2) and which is movable. The movement of the lock, relative to the section join, is coupled to the position of the saw blade (3) in the section join. The lock may be arranged in the longitudinal direction of the section join. The lock may be built as an angled band, whilst the section join may be built in a section join member (6) which may be made from wood, aluminium, composite or plastic.