Manual Blower Attachment Interlock for Safe Attachment Exchange
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Solution Overview
Problem
Existing manually guided blowers, especially those with internal combustion engines, face complications in exchanging attachments due to unintentional release issues and require complex procedures, and often cannot operate without attachments at both intake and discharge openings.
Innovation Solution
The blower design incorporates separate switches for the intake and discharge openings, ensuring the drive motor is only ready-to-operate when both attachments are correctly secured, using a simple connection mechanism like bayonet closure and torsion springs to prevent unintentional actuation, allowing for straightforward attachment exchange without disassembling other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake grille is fixed in place by screws or bolts to prevent unintentional release, then the reliability of the attachment is improved, but the ease of exchanging the attachment deteriorates
Solution Approach 1:
The attachment system is segmented into separate functional components: a simple connection mechanism (bayonet closure) for easy attachment/detachment, and a separate switch mechanism for safety control. This segmentation allows the connection function to be simple while the control function ensures reliability.
Solution Approach 2:
A switch mechanism acts as an intermediary between the attachment and the drive motor. The switch must be actuated by the attachment to enable motor operation, providing safety control without requiring complex fastening mechanisms. This intermediary decouples the mechanical connection from the operational control.
2Adaptability or versatility
If the blower is designed to operate without an attachment at the discharge opening, then the versatility of operation is improved, but the safety control deteriorates
Solution Approach 1:
The switch mechanism provides feedback about the attachment state to the control system. The drive motor is enabled only when the switch is actuated, confirming proper attachment. This feedback loop ensures safety control while allowing operational flexibility when attachments are properly installed.
Solution Approach 2:
The system dynamically adapts its operational state based on the attachment configuration. The switch can be actuated or not actuated depending on whether an attachment is present, allowing the system to be versatile while maintaining safety through conditional operation control.
3Ease of operation
If separate switches are provided for intake and discharge openings with independent actuation, then the ease of exchanging attachments is improved, but the device complexity increases
Solution Approach 1:
The control system is segmented into separate switches for each opening, allowing independent operation. Each switch is a simple component that can be independently actuated by its corresponding attachment, simplifying the attachment exchange process while distributing the complexity across multiple simple elements rather than one complex interdependent system.
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 ensures safe and reliable operation by preventing unintentional actuation and allowing for easy attachment exchange, ensuring the blower operates only when attachments are correctly mounted, enhancing user safety and handling efficiency.
Implementation Method 1
using a simple connection mechanism like bayonet closure and torsion springs to prevent unintentional actuation
Data Source
AI summary
A manually guided blower having a housing in which is disposed a drive motor that rotatingly drives an impeller. The impeller draws in an air stream via an intake opening and conveys the air stream through a discharge opening of the housing. The blower has at least one attachment that can be detachably connected to the housing in the region of one of the openings. The blower has at least one switch that is actuated when the attachment is secured to the opening, whereby the drive motor is in a ready-to-operate state only when the switch is actuated.