Charging Handle Two-Piece Support Apparatus Gear Alignment
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Solution Overview
Problem
Existing circuit breaker charging handle systems face issues with improper gear installation and loss during assembly, leading to incorrect orientation and increased complexity in mechanical charging.
Innovation Solution
A two-piece support apparatus is introduced, comprising a base and engagement portion, which allows for pre-assembly of the gear with the handle assembly, ensuring correct orientation and preventing misalignment, thus enabling easy mounting to a circuit breaker shaft without risk of gear loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ratcheting handle with gear and shaft is used to mechanically charge the operating mechanism, then the circuit breaker can be manually recharged, but the gear may be improperly installed or lost during assembly
Solution Approach 1:
The charging handle apparatus is divided into separate modular components: a handle assembly, a gear, and a two-piece support apparatus (base portion and engagement portion). This segmentation allows each component to be independently manufactured and assembled, reducing the risk of improper installation while maintaining functional integrity.
Solution Approach 2:
The gear is pre-assembled with the engagement portion of the support apparatus before final installation onto the circuit breaker. This preliminary assembly ensures the gear is securely retained by the engagement structures (such as teeth or protrusions) on the engagement portion, preventing loss during handling and installation. The base portion is also prepared in advance to receive the engagement portion.
2Reliability
If the gear is pre-assembled with the handle assembly, then the gear cannot be lost during assembly, but the support apparatus requires a two-piece structure with movable portions
Solution Approach 1:
The support apparatus is segmented into two distinct pieces: a base portion that attaches to the handle assembly and an engagement portion that retains the gear. This segmentation allows the engagement portion to be pre-assembled with the gear to ensure proper retention, while the base portion can be independently prepared. The two pieces are then joined together to complete the support structure.
Solution Approach 2:
The engagement portion is designed to be movable with respect to the base portion during assembly, allowing for easy installation and adjustment. The engagement structures on the engagement portion can engage with corresponding features on the gear and base portion in a controlled manner, providing both flexibility during assembly and stability during operation.
3Device complexity
If the gear and handle cannot be pre-assembled, then the system can be simpler, but the gear may become lost during assembly
Solution Approach 1:
The gear and engagement portion are merged into a pre-assembled unit through mechanical retention features such as interlocking teeth, protrusions, or snap-fit mechanisms. This merging ensures the gear cannot be lost during handling or installation, as it is securely retained by the engagement structures on the engagement portion. The pre-assembled unit is then installed as a single component onto the base portion.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A charging handle apparatus (2) includes a two-piece support apparatus (24) that is disposed on a handle assembly (20) and that is engaged with a gear (22). One of the two pieces is movable with respect to the first piece. The second piece of the support apparatus (24) includes a number of engagement structures (76A, 76B) that are engaged with the gear (22) and that retain the gear in a given position with respect to the handle assembly (20). The charging handle apparatus (29) thus can be provided as a pre-assembled component that is readily mountable to a shaft of a circuit interrupter (8).