CPA Device Lever Lock Prevents Connector Stress
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Solution Overview
Problem
Existing Connector Position Assurance (CPA) devices face issues with stress and deformation at both pre-lock and final-lock positions due to material creep under high temperature conditions, and require header modification for effective locking, which is not feasible in all cases.
Innovation Solution
The CPA device design includes a body portion with two parallel arms and a center arm featuring a locking groove and latch mechanism that engages with complementary protrusions on the female housing, allowing dislodgment upon contact with the male header connector, preventing deformation and stress through bidirectional translation and a lever lock for final-lock position retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CPA device is in a stressed state during full mating and locking, then the connector achieves proper locking, but thermal effects under high temperature conditions increase material creep and affect CPA device functionality
Solution Approach 1:
The patent inverts the traditional locking approach by using a lever lock mechanism that locks in the unlocked state and requires deliberate action to engage the final locked state. This inversion allows the CPA device to remain in a low-stress state during normal operation while still achieving secure locking when needed, thereby reducing thermal creep effects.
Solution Approach 2:
The CPA device employs a dynamic lever lock mechanism that can transition between multiple states (unlocked, locked, and disengaged). This dynamic design allows the device to adapt its stress state based on operational requirements, reducing continuous stress exposure that would otherwise cause material creep under thermal conditions.
2Ease of operation
If a lock is used in the header side to disengage the CPA device from pre-lock position, then disengagement is achieved, but the locking capability of the primary locking system may be affected if the lock is damaged
Solution Approach 1:
The patent introduces a lever lock as an intermediary mechanism between the CPA device and the header connector. This lever lock serves as a mediator that facilitates disengagement without compromising the primary locking system, as it operates independently through a camming action that releases the locking lugs without affecting the structural integrity of the main locking mechanism.
3Ease of operation
If the header is modified to include special disengagement features, then CPA device disengagement is achieved, but standard headers such as those conforming to USCAR footprint cannot be used
Solution Approach 1:
The lever lock mechanism is designed with universal applicability, allowing it to function with standard headers conforming to various footprints including USCAR standards. The lever lock's camming action and geometry are configured to work with conventional header designs, eliminating the need for specialized header modifications while maintaining disengagement capability.
4Reliability
If the CPA device uses a pre-locking mechanism that requires full mating to disengage, then half-mated connections are avoided, but the device remains in a stressed state throughout the process
Solution Approach 1:
The patent segments the locking function into distinct phases: an initial pre-lock state with minimal stress, a transition phase during insertion, and a final locked state. The lever lock mechanism enables this segmentation by allowing the CPA device to engage locking lugs in a low-stress pre-lock position and then transition to full locking only after proper mating is confirmed, thereby reducing cumulative stress exposure.
Data Source
AI summary
A Connector Position Assurance (CPA) device for ensuring mating of a male header connector with a female housing includes a body portion, a first arm, and a second arm. The first arm is attached to the body portion, extended from the body portion, and includes a locking groove proximate a distal end thereof. The second arm, which includes a locking latch, is spaced apart from the first arm, attached to the body portion, and extended from the body portion. When the CPA device is guided along the female housing, the locking groove and the locking latch lock onto complementary protrusions on the female housing in a pre-lock position, only to be dislodged upon contact of a sloped surface at the distal end of the first arm with the male header connector during insertion of the male header connector into the female housing to proceed to a final-lock position.