Washer Door Lock Mechanism for Self-Centering Sealed Latching
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Solution Overview
Problem
Commercial and residential door locks and latches often experience wear and breakdown due to repeated use, leading to issues like loose fittings, inadequate sealing, and operational difficulties, which can result in leaks, inefficient operation, and security vulnerabilities.
Innovation Solution
A latching and locking mechanism featuring a locating pin with a tapered end that mates with a tapered opening in the machine casing, combined with a cam surface and latching pin system, ensures proper alignment, sealing, and locking of the door, utilizing a handle to rotate the locating pin and engage the latching pin with a roller to pull the door closed and a locking pin to secure it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional latching and locking mechanism is used, then the door can be locked and unlatched, but the mechanism experiences wear and breakdown due to repeated use
Solution Approach 1:
The locating pin incorporates a tapered portion that mates with a tapered opening in the casing, creating a conical interface that provides self-centering and reduces wear through curved surface contact. The cam surface also utilizes curved geometry to convert rotational motion into linear latching motion smoothly, reducing impact and wear on the mechanism components.
Solution Approach 2:
The tapered locating pin performs preliminary alignment and centering of the door frame relative to the casing before the latching action occurs. This preliminary positioning ensures that subsequent latching and locking operations occur at the correct location, preventing misalignment wear and ensuring proper sealing surface contact.
2Reliability
If the door is locked securely, then security is improved, but the mechanism becomes more complex
Solution Approach 1:
The mechanism combines multiple functions into a single integrated latching and locking assembly. The locating pin with tapered portion performs both positioning and alignment functions, while the cam surface integrates the latching action with the locking pin engagement. This merging reduces the number of separate components and simplifies the overall mechanism while maintaining secure locking.
Solution Approach 2:
The locating pin serves multiple functions: it acts as a positioning element, an alignment reference through its tapered portion, and a rotational actuator for the latching mechanism. The cam surface simultaneously guides the latching pin and provides the mechanical advantage needed for secure locking. This multi-functionality reduces component count and simplifies the mechanism.
3Object-affected harmful factors
If the door is properly aligned and sealed, then leakage is prevented, but the mechanism requires precise manufacturing
Solution Approach 1:
The tapered locating pin and matching tapered opening create a conical interface that provides self-aligning characteristics. The curved surfaces guide the door frame into proper alignment as it closes, ensuring consistent sealing surface contact without requiring extremely tight manufacturing tolerances on all components.
Solution Approach 2:
The tapered portion of the locating pin performs preliminary alignment of the door frame with the casing before the final sealing contact occurs. This preliminary action ensures that the sealing surfaces are properly positioned, and the cam surface then maintains this alignment during the latching operation, ensuring consistent leak-proof sealing.
Data Source
AI summary
A latching and locking mechanism for a door includes a locating pin passing through a portion of a door frame and a handle. A tapered portion formed at an end of the locating pin mates with a tapered opening formed in a casing of the machine to position the door frame relative to the casing. A cam surface defined on the casing engages a latching pin connected to the locating pin and extending radially therefrom adjacent to the tapered portion such that the latching pin pulls the door frame toward the closed position when the handle is rotated.