Convertible Cam Drive for Multi-Orientation Door Latch
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Solution Overview
Problem
Conventional door latch and handle assemblies are inflexible, allowing only one orientation configuration, which can lead to mechanical incompatibility issues and require replacement when orientation changes are needed, such as from vertical to horizontal, increasing material and labor costs.
Innovation Solution
A convertible cam drive assembly that enables door latch and handle assemblies to be used in multiple orientations (up, down, horizontal left, or right) by incorporating a sliding bolt mechanism and a cam actuator system, allowing the door handle to pivot and change positions without requiring new holes or replacing the latch/bolt assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional door latch assemblies are designed for a single orientation, then the mechanical structure is simple and reliable, but the adaptability to different orientations is poor
Solution Approach 1:
The cam drive assembly is designed with a universal mounting structure that allows it to function in multiple orientations (vertical and horizontal). The base plate includes mounting holes arranged to accommodate both vertical and horizontal door handle orientations, enabling the same latch mechanism to serve multiple functions without requiring separate designs for each orientation.
Solution Approach 2:
The cam mechanism incorporates a rotatable cam follower that can dynamically adjust its position relative to the cam lobe. This dynamic adjustment allows the latch to operate correctly regardless of whether the door handle is oriented vertically or horizontally, as the cam follower can pivot to maintain proper engagement with the cam lobe in any orientation.
2Adaptability or versatility
If door handles are reoriented from vertical to horizontal, then adaptability to different usage scenarios improves, but the existing latch assembly becomes mechanically incompatible
Solution Approach 1:
The cam drive assembly incorporates a universal base plate with mounting holes positioned to accommodate both vertical and horizontal door handle orientations. This universal design ensures that the same latch assembly maintains reliable mechanical compatibility whether the door handle is installed in a vertical or horizontal orientation, eliminating the need for different latch mechanisms for different orientations.
Solution Approach 2:
The cam lobe is designed with an asymmetric profile that provides different engagement characteristics for different orientations. The asymmetric cam profile ensures proper mechanical engagement and force transmission whether the door handle is pulled in a vertical or horizontal direction, maintaining reliability across different orientations.
3Ease of operation
If door handles are made positionable in multiple orientations, then ease of operation improves for different user needs, but the device complexity increases
Solution Approach 1:
The mounting system is segmented into modular components: a base plate with multiple mounting holes, a cam drive assembly, and a door handle assembly. This segmentation allows the door handle to be independently positioned and mounted in different orientations while the base plate provides the structural foundation. The modular design simplifies installation and reconfiguration compared to a monolithic integrated system.
Data Source
AI summary
A door latch assembly is described with a convertible cam drive having a door bolt assembly including a sliding bolt configured for reciprocal sliding action between a latch position and a release position. Such an embodiment includes a cam drive assembly having a bolt actuator as well as a cam holder configured for placement within the cam receiving aperture of the base plate to accommodate the base plate being mounted in one of the plurality of orientations with respect to the door. The cam drive assembly is constructed and arranged for receiving the cam engaging portion of the door handle when pivoted from the rest position to the actuating position, thereby causing the sliding bolt to move from a latch position to a release position using the bolt actuator.