Latched Battery Cavity with Multi-Stage Actuation
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Solution Overview
Problem
Household-type products face challenges in complying with safety standards that prevent small battery components from being accidentally ingested, as existing designs struggle to securely retain batteries while allowing for easy installation and removal.
Innovation Solution
A device with a battery cavity featuring a latch mechanism that requires multi-stage actuation for battery release, combining a lip for partial retention and a latch that translates and depresses to ensure secure battery retention until complete actuation, aligning with safety standards like UL 4200A.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple battery retention design is used, then ease of manufacture is improved, but safety compliance deteriorates
Solution Approach 1:
The battery retention mechanism is divided into multiple functional components: a lip extending from the cavity for initial retention, a latch with separate actuation and depression stages, and a locking member with engagement and disengagement features. This segmentation allows each component to perform its specific function while collectively achieving safety compliance through controlled multi-stage release.
2Reliability
If a secure battery retention mechanism is used, then safety compliance is improved, but ease of operation deteriorates
Solution Approach 1:
The latch mechanism employs dynamic movement through two distinct actuation stages: first translating in a transverse direction to initiate release, then depressing in a perpendicular direction to complete disengagement. This dynamic multi-stage process ensures secure retention during normal use while allowing controlled removal when proper actuation sequence is followed.
3Reliability
If a multi-stage latch actuation is used, then safety compliance is improved, but device complexity increases
Solution Approach 1:
The latch mechanism integrates multiple functions into a single cohesive component structure. The locking member combines both the actuation interface and the engagement features, while the spring arm serves dual purposes as both the actuation lever and the retention force provider. This merging reduces the number of separate components needed while maintaining the multi-stage safety mechanism.
4Reliability
If a lip extending over the cavity is used, then battery retention is improved, but manufacturing precision requirements increase
Solution Approach 1:
The lip is designed with specific local geometric properties including a predetermined extension distance over the cavity and a specific cross-sectional shape. These localized quality specifications ensure that the lip provides adequate retention force while accommodating reasonable manufacturing tolerances. The lip works in conjunction with the latch mechanism rather than requiring absolute precision alone.
Data Source
AI summary
Various implementations include devices with a latched battery cavity. In one implementation, a device includes: a body; a cavity within the body for holding a battery; a lip extending at least partially about the cavity; and a latch coupled with the body proximate the cavity for regulating movement of the battery in the cavity, wherein the latch requires multi-stage actuation to permit removal of the battery from the cavity, wherein the latch is actuatable to translate in a direction transverse to an outer surface of the battery and to depress in a direction substantially perpendicular to the direction transverse to the outer surface.