RV Entry Door Extension Handle for Latch Reach
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Solution Overview
Problem
Recreational vehicle entry doors with paddle latches face ergonomic challenges due to small target size and reach issues, especially when a solid step is stowed or the latch is high off the ground, and existing double-latch solutions with cable actuators are prone to failure.
Innovation Solution
An entry door extension handle that extends the target area for the paddle latch by 10 inches or more, providing added leverage and simplifying the connection between main and auxiliary latches with a rigid bar, allowing easier grip and actuation, and can be retrofitted to existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a paddle latch is used for RV entry doors, then the door can be opened with a simple mechanism, but the target area for user hands is very small making it difficult to actuate
Solution Approach 1:
The extension handle adds a longitudinal dimension to the existing paddle latch, extending it outward from the door surface. This transforms the originally two-dimensional paddle into a three-dimensional structure with extended reach, allowing users to operate the latch from a greater distance without complicating the internal mechanism.
Solution Approach 2:
The latch system is segmented into distinct functional components: the original paddle latch mechanism remains intact while a separate extension handle assembly is added. This segmentation allows the extension handle to be independently adjusted and removed without affecting the core latch operation.
2Device complexity
If the paddle latch is positioned high off the ground for fifth wheel applications, then the door structure is simplified, but users have difficulty reaching the latch
Solution Approach 1:
The extension handle compensates for vertical positioning by adding horizontal reach. Users can extend their arms further horizontally to reach the latch at elevated positions without requiring structural modifications to lower the latch or add external scaffolding.
Solution Approach 2:
The extension handle is pre-installed on the door, providing extended reach capability before the user attempts to operate the latch. This preliminary structural preparation eliminates the need for users to improvise reaching solutions when encountering high-positioned latches.
3Device complexity
If a solid step is in stowed position, then the door maintains a clean appearance and compact structure, but users cannot stand on the step to reach the latch
Solution Approach 1:
The extension handle provides vertical clearance by extending the operational interface away from the door surface. Users can reach the latch while standing on the ground without needing to deploy the step, as the extended handle creates sufficient operational space between the user's hand and the door body.
4Adaptability or versatility
If a cable actuator is used to connect auxiliary latch and main latch, then the system can open the door from outside, but the cable is prone to breaking or failing
Solution Approach 1:
The fragile cable actuator system is replaced with a rigid rod mechanism that provides the same functional connectivity between the auxiliary and main latches. The solid rod eliminates the bending stresses and connection points that cause cable failure while maintaining the ability to transmit actuation force from the auxiliary latch to the main latch.
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 solution enhances user leverage and reach, making it easier to operate the latches without interfering with exterior hand rails and eliminates the risk of cable actuator failure in double-latch systems.
Implementation Method 1
The extension bar is pivotable between a closed position and an open position. In the open position, the extension bar pivots the main bracket to an unlocked position.
Implementation Method 2
The entry door extension handle creates added leverage for actuating the paddle latch
Implementation Method 3
Activating the lower latch applies a torsion to the bar which in turn activates the upper latch
Data Source
AI summary
An entry door extension handle cooperable with a door latch assembly includes a main bracket securable to the door latch assembly, an extension bar connected to the main bracket, and an auxiliary bracket assembly connected to an end of the extension bar opposite from the main bracket. The extension bar is pivotable between a closed position and an open position. In the open position, the extension bar pivots the main bracket to an unlocked position. The auxiliary bracket assembly includes an auxiliary bracket configured for pivoting with the main bracket and the extension bar.