Universal Latch Handle with Bow-Tie Cam Lever
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional push/pull door latch assemblies are not adaptable to a wide variety of latch configurations, limiting their compatibility and functionality.
Innovation Solution
A door handle assembly featuring a cam with a bow-tie profile and a contoured finger-like cam lever, along with an adapter plate for various mounting positions, allows for easy conversion of latch assemblies to push/pull type and includes a stop for improved touch and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional push/pull door latch assemblies are used, then the assembly structure is simple, but the adaptability to various latch configurations is limited
Solution Approach 1:
The cam lever assembly is designed with multiple mounting positions and orientations, allowing a single assembly to accommodate various latch configurations including centered and off-set arrangements. The adapter plate provides multiple hole patterns that can be configured to match different latch types, making the push/pull handle assembly universally adaptable without requiring multiple specialized components.
Solution Approach 2:
The cam lever is designed to be positionable in different orientations relative to the adapter plate, allowing dynamic adjustment to match various latch configurations. This adjustability enables the same basic assembly to work with different door and latch setups without requiring custom-designed components for each configuration.
2Productivity
If push/pull door handles are designed for specific latch configurations, then the operational efficiency is improved, but the versatility across different configurations is reduced
Solution Approach 1:
The cam mechanism is designed with a general bow-tie profile that can engage with different latch bolt configurations, while the adapter plate provides multiple mounting options. This universal design maintains operational efficiency across various latch types without requiring configuration-specific optimizations.
3Ease of operation
If the cam lever travel is unlimited, then the ease of operation is improved, but the touch and feel quality deteriorates
Solution Approach 1:
The stop is pre-positioned to limit the cam lever's return stroke travel before complete reversal. This preliminary limitation prevents excessive travel that would degrade touch and feel quality, while still allowing sufficient travel range for easy operation. The stop is strategically positioned to provide optimal balance between operational ease and quality feedback.
Data Source
AI summary
A door handle assembly for use with a door is provided with a base plate, a door handle having a working end pivotally connected to the base plate and a free end opposite of the working end configured for manipulation by an operator. An adapter plate mounted on the working end of the door handle and a cam lever are also included in the present door handle assembly. A securable end of the cam lever is affixable to the adapter plate, and a free end of the cam lever is configured for engagement with a cam, for activating a door latch assembly.