Ratcheting Chassis Latch With Cam Quick Release for Blind Mating
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Solution Overview
Problem
Conventional latches for connecting boards to backplanes require high insertion forces, have small de-mate allowances, and often use thumbscrews that occupy valuable space and are not user-friendly for quick release.
Innovation Solution
A ratcheting latch with a cam action mechanism that amplifies user effort for secure connection and provides a quick release, using a cam tooth and cam hook to engage and disengage with the chassis striker, allowing single-handed operation without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional latches with thumbscrews are used to secure boards to backplanes, then the connection can be maintained securely, but the device face occupies valuable space and quick release is not enabled
Solution Approach 1:
The patent removes the thumbscrew component entirely from the latch mechanism. Instead of using a thumbscrew to secure the connection, the invention employs a cam-based ratcheting mechanism that maintains secure connection without requiring a thumbscrew, thereby freeing up device face space while preserving connection reliability
Solution Approach 2:
The patent inverts the conventional approach by using a cam mechanism that self-secures through rotational motion rather than requiring a thumbscrew to be turned. The cam tooth and cam hook work together to create a self-latching mechanism that secures the board to the backplane without occupying additional face space
2Reliability
If multiple thumbscrews are used to secure the latch, then the connection can be maintained, but service difficulty increases and user operation becomes complex
Solution Approach 1:
The patent segments the latching function into distinct components: a cam tooth on the movable arm, a cam hook on the stationary member, and a ratcheting mechanism. This segmentation allows each component to perform its specific function efficiently, with the cam mechanism providing secure engagement and the ratcheting mechanism enabling easy release, thereby improving ease of operation while maintaining connection security
Solution Approach 2:
The cam mechanism is designed to self-secure the connection through its geometric shape and interaction with the ratcheting mechanism. Once the cam tooth engages with the cam hook, the connection is automatically secured without requiring additional thumbscrews or complex operations, making the system user-friendly while maintaining reliability
3Reliability
If high insertion forces are used to mate connectors, then secure connection is achieved, but the required force of 126 N or greater is excessive for user operation
Solution Approach 1:
The patent employs a cam mechanism with curved surfaces that convert rotational motion into linear force multiplication. The cam tooth and cam hook geometry are designed to amplify the user's rotational input force into the high linear force needed to seat the connectors securely, reducing the perceived insertion force while achieving reliable connector engagement
Solution Approach 2:
The patent changes the operational parameters by using a mechanical advantage system where a small rotational displacement of the cam generates a large linear force. This parameter transformation allows the user to apply minimal force over a larger distance (rotation) to achieve the high force needed for secure connector seating, effectively reducing the insertion force requirement from 126 N or greater to a manageable level
4Area of stationary object
If conventional latches are used with small de-mate allowances, then space is conserved, but the tolerance stack issues make spring-loaded latches unfeasible
Solution Approach 1:
The patent employs a dynamic ratcheting mechanism with a cam tooth and cam hook that can accommodate tolerance variations through its mechanical design. The cam mechanism allows for incremental engagement and adjustment, absorbing tolerance stack issues that would prevent spring-loaded latches from functioning properly, while maintaining a compact profile that conserves space
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 ratcheting latch reduces user effort, ensures secure seating of connectors without tools, and allows for quick release, while maintaining a thin profile that does not obstruct space on the device face.
Implementation Method 1
A ratcheting latch with a cam action mechanism that amplifies user effort for secure connection and provides a quick release, using a cam tooth and cam hook to engage and disengage with the chassis striker
Implementation Method 2
A ratcheting latch with a cam action mechanism that amplifies user effort for secure connection
Data Source
AI summary
An apparatus is provided for securing a first chassis within a second chassis in a manner than completes a blind connection and maintains that connection without the use of tools. A cam tooth on an arm rotating with respect to the first chassis engages a striker on the second chassis and, with rotation of the arm toward the first chassis, draws the first chassis into the second. The arm is attached to a handle including a cam hook that rotates to engage a striker of the first chassis. With rotation of the cam hook, the striker draws the handle toward the first chassis, the resulting movement of the arm toward the first chassis causing the arm to rotate and the cam tooth to draw the first chassis into the second.