Engine Blower Handle Assembly for Stable Static Discharge
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Solution Overview
Problem
Conventional engine blowers with conductive resin layers on handles face challenges in maintaining stable electrical conductivity due to variations in parts dimensions and assembly accuracy, leading to unreliable connections and potential static electricity buildup.
Innovation Solution
The engine blower design incorporates a conductive resin layer on the handle with interior exposed sections that are electrically coupled via a compressible conductive spring and a conductive line, ensuring reliable contact and static electricity discharge, even with misalignments or variations in assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conductive resin layer is provided on the handle surface, then the number of parts and parts cost are reduced, but reliable electrical coupling between the resin layer and Bowden wire cannot be maintained due to variations in parts dimension and assembly accuracy
Solution Approach 1:
The patent employs a compression spring instead of a rigid connector to couple the conductive resin layer with the Bowden wire. The spring's elastic properties allow it to dynamically adjust to variations in parts dimensions and assembly accuracy, maintaining reliable electrical contact despite manufacturing tolerances. This dynamic approach replaces a static rigid connection that would fail under dimensional variations.
Solution Approach 2:
The patent changes the physical state of the connector from rigid to elastic by using a compression spring. This parameter change allows the connector to deform elastically within a certain range, accommodating dimensional variations in the resin layer and Bowden wire while maintaining continuous electrical contact. The spring's force constant and compression range are optimized to ensure reliable coupling.
2Reliability
If a grounding wire or discharge plate is provided to eliminate static electricity, then static electricity discharge reliability is improved, but the number of parts and assembly complexity increase
Solution Approach 1:
The patent merges the static electricity discharge function with the existing handle structure by forming a conductive resin layer directly on the handle surface. This eliminates the need for separate grounding wires or discharge plates, as the handle itself becomes the discharge path. The conductive resin layer is integrated into the handle's grip area, combining the ergonomic function with the electrostatic discharge function.
Solution Approach 2:
The handle structure serves dual purposes: providing ergonomic grip for the operator and simultaneously acting as the electrostatic discharge path. The conductive resin layer on the handle surface allows the handle to self-discharge static electricity without requiring additional dedicated discharge components. The operator's body acts as the grounding path when gripping the handle.
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 stabilizes electrical conductivity and effectively discharges static electricity from the ventilation tube to the handle and then to the engine, preventing sudden shocks to the operator and simplifying assembly by eliminating the need for dedicated contact sections.
Implementation Method 1
a conductive spring having a coil compressed in a direction in which the cases are assembled with each other
Implementation Method 2
the resin layer is integrated with interior exposed sections exposed within the handle... the interior exposed sections of the resin layer are brought into contact with the coil of the spring while being electrically coupled with the conductive line via the spring
Implementation Method 3
the coil can be brought into contact with the interior exposed sections by a predetermined tensional force generated in the coil
Data Source
AI summary
An engine blower includes: an engine integrated with a volute for driving a fan; a ventilation tube communicated with the volute; and a handle mounted to the ventilation tube. In the engine blower, the handle has a pair of cases that are assembled with each other, and a conductive resin layer is formed on a surface of a grip of the handle. The resin layer is integrated with gates exposed within the handle. A conductive spring having a coil compressed in a direction in which the cases are assembled with each other and a cable that is electrically coupled with the engine are disposed within the handle. The gate of the resin layer is brought into contact with the coil of the spring and is electrically coupled with the cable via the spring.