Self-Locking Door Latch for High-Impact Centrifuge Loads
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Solution Overview
Problem
Conventional latches on appliances are inadequate to withstand high-impact forces from heavy loads or high-speed operations, posing safety risks, particularly in laboratory centrifuges.
Innovation Solution
A self-locking linear actuator system with a locking bolt and resilient member, where the locking bolt has a sloped surface and a latch surface, allowing controlled movement and secure engagement with the door, preventing unintended opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional latch is used on the door, then the device complexity is low, but the reliability is insufficient to withstand high-impact forces from heavy loads or high-speed operations
Solution Approach 1:
The locking bolt is designed with a sloping surface that allows it to dynamically adjust its position during door closure. The bolt automatically retracts when contacting the sloping surface during insertion, then engages positively when the door is fully closed, providing adaptive locking that responds to door position and impact forces
Solution Approach 2:
The locking bolt is segmented into distinct functional portions: a latching portion with a sloping surface for controlled engagement, and a locking portion for secure retention. This segmentation allows each portion to perform its specific function optimally - the latching portion manages the engagement transition while the locking portion provides impact resistance
2Strength
If the locking bolt has a large dimension in the insertion direction, then the locking strength is increased, but the ease of operation deteriorates due to difficulty in insertion and withdrawal
Solution Approach 1:
The locking bolt incorporates a sloping surface that acts as a mechanical wedge, converting the closing force into a component that pushes the bolt inward during insertion. This curved/sloped geometry enables the bolt to be pushed in easily during door closure while maintaining full locking strength when engaged
3Reliability
If the locking bolt is designed to closely fit the engagement section, then the reliability against impacts is improved, but the ease of manufacture deteriorates due to tighter tolerances
Solution Approach 1:
The locking bolt features localized engagement surfaces with specific geometries - the sloping surface for controlled retraction and the locking portion for secure engagement. This local quality optimization allows reliable impact resistance at the engagement interface while maintaining easier manufacturing for the overall bolt structure
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
The system provides robust and reliable door locking, effectively resisting high-impact forces and ensuring safety in appliances like centrifuges by preventing accidental door opening.
Implementation Method 1
the latching portion has a sloping surface; the sloping surface is arranged for contacting the locking member as it moves in the insertion direction to thereby provide a reaction force that tends to retract the locking bolt along the axis
Implementation Method 2
a linear actuator for moving the locking bolt along an axis, wherein the linear actuator is self-locking
Data Source
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AI summary
The present invention relates to the latching closed of doors on appliances. In particular, the present invention provides an advantageous apparatus for locking the lid of a centrifuge. Apparatus for locking an appliance door in a closed position, the apparatus comprises: a locking member for attachment to a door, the locking member having an engagement section; a locking bolt for engaging the engagement section in the locking member; a linear actuator for moving the locking bolt along an axis, wherein the linear actuator is self-locking.