Lever Actuated Latch Assembly for RV Door Security
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Solution Overview
Problem
Paddle handle assemblies for recreational vehicles face challenges such as difficulty in obtaining a positive grip, maintaining deadbolt alignment, and locking from the exterior, as well as complex and costly construction, which complicates manufacturing and repair.
Innovation Solution
A latch assembly with an outside housing, a door latch, and an external lever handle that includes a plunger with a resilient member and cam surfaces, allowing for easy operation from both sides and secure locking, while simplifying the design for reduced manufacturing and repair costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a paddle handle assembly is mounted on the door exterior with the paddle extending opposite to the user's favored hand, then the latch can be operated from both inside and outside, but it becomes difficult for the user to obtain a positive grip
Solution Approach 1:
The lever handle is designed with asymmetric geometry featuring a contoured grip portion with a first cross-sectional dimension greater than a second cross-sectional dimension. This asymmetry provides an ergonomic shape that is easier to grip with the favored hand while maintaining the ability to operate the latch from both sides of the door.
2Reliability
If a deadbolt lock is added to the paddle handle assembly for added security, then the security is improved, but the construction becomes more complicated and expensive to manufacture and repair
Solution Approach 1:
The deadbolt mechanism is integrated with the lever handle assembly such that the lever handle directly actuates the deadbolt through a shared cam mechanism. This merging of functions allows the single lever handle to control both the latch and deadbolt, simplifying the overall construction while maintaining security.
3Reliability
If a deadbolt lock is added to the paddle handle assembly, then security is improved, but maintaining alignment between the deadbolt and associated strike becomes difficult
Solution Approach 1:
The housing is designed with precision-machined camboon surfaces and guide features that ensure the deadbolt and latch move in synchronized parallel paths. This equipotential design maintains proper alignment between the deadbolt and strike throughout the operation, eliminating alignment issues while preserving security.
4Adaptability or versatility
If many components are included in the paddle handle assembly to achieve various functions, then the functionality is improved, but the construction becomes complicated and expensive
Solution Approach 1:
The lever handle assembly is designed as a multi-functional unit where a single lever handle controls both the latch and deadbolt mechanisms. The cam mechanism serves dual purposes by actuating both locking components, reducing the total number of separate components while maintaining comprehensive functionality.
Solution Approach 2:
Multiple functions (latch operation, deadbolt actuation, and securing) are merged into a single integrated assembly where the lever handle, cam, and housing work together as one unit, simplifying construction and reducing component count.
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 latch assembly provides improved user accessibility and security, maintains alignment between the deadbolt and strike, and simplifies construction and maintenance, addressing the drawbacks of prior art paddle handle assemblies.
Implementation Method 1
A resilient member is operably coupled with the plunger and urges the plunger to the latched position
Implementation Method 2
the plunger is displaced from the latched position to the unlatched position when the external lever handle is displaced from the retracted position to the extended position by the cam surface of the handle cam bearing against the plunger cam surface
Data Source
AI summary
A latch assembly comprises an outside housing, a door latch, an external lever handle, a plunger, a resilient member, and a handle cam. The handle cam comprises a cam surface juxtaposed against and in sliding relation with a plunger cam surface. The plunger is maintained in the latched position when the external lever handle is in the retracted position by the resilient member, whereby an entry door cannot be unintentionally shifted from the closed position, and the plunger is displaced from the latched position to the unlatched position when the external lever handle is displaced from the retracted position to the extended position by the cam surface of the handle cam bearing against the plunger cam surface, whereby the entry door is free to be shifted from the closed position to the open position.