Automatic Locking Hinge Geometry for One-Handed Lid Operation
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Solution Overview
Problem
Existing hinge mechanisms for small containers face issues with incorrect closure upon accidental impact, require additional parts for operation, and pose risks of pinching or material wear due to springs and levers.
Innovation Solution
A hinge mechanism with automatic locking, featuring rotation attachments and locking attachments that engage via angled and chamfered ends, allowing automatic locking and unlocking without additional components, suitable for small containers and enabling one-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction locks with levers, springs and clutches are used, then the hinge can be locked by friction, but the components become clogged in small dimensions and require additional parts that increase cost
Solution Approach 1:
The patent removes the complex friction lock mechanism (springs, clutches, levers) and replaces it with a simple geometric locking system using a locking arm that engages with a locking recess. This extraction of unnecessary components resolves the contradiction by maintaining locking reliability through pure geometric constraint while eliminating the clogging and cost issues associated with multiple small parts.
Solution Approach 2:
The locking mechanism is segmented into two main components: a locking arm attached to the lid and a locking recess in the hinge body. This segmentation allows each component to be simple and easy to manufacture while working together to provide reliable locking, avoiding the need for complex integrated mechanisms.
2Reliability
If ratchet-locking hinges with spring-loaded mobile elements are used, then mechanical lock against unintentional closure is provided, but pinching risks and unwanted stresses occur during operation
Solution Approach 1:
The patent removes the spring-loaded mobile element and ratchet mechanism that cause pinching risks. Instead, it uses a passive geometric locking system where the locking arm naturally engages with the locking recess when the lid is opened to a specific angle, providing anti-closure reliability without any moving springs or risk of pinching during operation.
Solution Approach 2:
Instead of using a spring that actively pushes to lock (which causes pinching), the invention uses a geometric configuration where the lid's opening motion itself drives the locking arm into the locking recess. The locking action is inverted from active spring-driven to passive geometry-driven, eliminating harmful factors while maintaining reliability.
3Reliability
If ratchet-locking hinges are used, then two hands are required for operation, but this reduces ease of operation
Solution Approach 1:
The locking mechanism is designed to be self-acting: when the lid is opened to a specific angle, the locking arm automatically engages with the locking recess without requiring manual intervention. The system serves itself by using the lid's opening motion to trigger the locking action, eliminating the need for two-handed operation while maintaining secure locking.
Data Source
AI summary
A hinge with automatic locking includes at least one rotation attachment, linked to the upper lid, capable of rotating around the stem, linked to the lower lid. Between each rotation attachment, there is, in the upper lid, at least one locking attachment facing the retaining attachment of the lower lid in the closed position of the lids, capable of rotating with the upper lid to a locking position with the lids open.