Power Tool Battery Interface Lockout With Latch Retention
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Solution Overview
Problem
Existing methods for preventing battery packs from attaching to power tools are cumbersome and do not provide adequate control over the use of experimental or damaged power tools, posing safety risks.
Innovation Solution
A lockout device that engages with the battery interface of a power tool, featuring a latch mechanism that can be locked or unlocked to prevent attachment of battery packs, and includes a cover to protect the electrical terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockable box surrounding the battery interface is provided to prevent battery pack attachment, then safety control is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The lockout device is divided into separate functional components: a lockable component that engages with the retention device, and a cover component that protects the electrical terminal. This segmentation allows each component to perform its specific function independently, reducing overall device complexity while maintaining safety control.
Solution Approach 2:
The lockout device acts as an intermediary component between the battery pack and the battery interface. By positioning itself at the interface and engaging with the retention device, it mediates the attachment process and prevents unauthorized or unsafe battery pack attachment without requiring modification of either the power tool or battery pack.
2Reliability
If a lockable box surrounding the battery interface is provided to prevent battery pack attachment, then safety control is improved, but ease of operation deteriorates
Solution Approach 1:
The lockout device separates the locking function from the attachment prevention function. The lockable component can be independently engaged or disengaged from the retention device, allowing users to easily control power tool usage by simply locking or unlocking this component without complex procedures.
Solution Approach 2:
The lockout device is designed to be self-contained and self-operating. Once attached to the battery interface, the lockable component can be independently locked or unlocked by the user without requiring external tools or assistance, making the safety control function easy to operate.
3Reliability
If the latch is made retainable in the latch engagement position, then reliability of lockout is improved, but device complexity deteriorates
Solution Approach 1:
The retention features (such as retention protrusions and retention grooves) are extracted as simple geometric elements from the latch and device body. This extraction allows the latch to be retained in the engagement position through basic mechanical interlocking without requiring complex retention mechanisms, maintaining reliability while minimizing device complexity.
Solution Approach 2:
Retention protrusions and grooves are placed at specific local positions on the latch and device body to provide targeted retention functionality. This local quality approach ensures the latch remains secured in the engagement position only where necessary, without adding complexity to the entire device structure.
Data Source
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AI summary
A lockout device for preventing a battery pack from attaching to a battery interface of a power tool, the battery interface being for mechanically and electrically engaging a battery pack to the power tool, the battery interface comprising a retention device for mechanically securing the battery pack to the battery interface, the lockout device comprising: a coupling configured for engagement with the retention device of the battery interface to prevent a battery pack from being attached to the battery interface.