Compact Rotation Converter for Bidirectional Exit Handle Actuation
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Solution Overview
Problem
Existing rotation converters for exit device assemblies are bulky, costly to upgrade, and lack aesthetic appeal, as they require replacement of the entire trim assembly to enable actuation of the latch control assembly by rotation of the handle in both directions.
Innovation Solution
A compact rotation converter comprising a case, an input member, a shuttle, and an output member, which converts bidirectional rotation of the input member into unidirectional rotation of the output member, allowing the handle to actuate the latch control assembly in both rotational directions without the need for full trim assembly replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing rotation converter mechanisms are used to convert bidirectional handle rotation to unidirectional spindle rotation, then the latch control assembly can be actuated in both directions, but the trim assembly becomes bulky and increases in size
Solution Approach 1:
The rotation converter is divided into separate functional components: a cam mechanism with cam lobes that converts rotational motion, a follower mechanism that translates cam rotation into spindle rotation, and a shutdown mechanism with detent features. This segmentation allows each component to be optimized for compactness while performing its specific function, reducing the overall trim assembly volume.
Solution Approach 2:
The rotation converter components are nested within the existing trim assembly structure. The cam mechanism is positioned within the handle assembly, the follower is integrated with the spindle connection, and the shutdown mechanism is embedded within the rotation converter housing. This nesting approach allows the rotation converter to fit within the existing trim assembly footprint without increasing overall size.
2Adaptability or versatility
If the entire trim assembly is replaced to enable bidirectional handle rotation, then the latch control assembly can be actuated in both directions, but the upgrade becomes costly and time-consuming
Solution Approach 1:
The rotation converter mechanism is extracted as a separate, standalone component that can be installed independently within the existing trim assembly. This allows the rotation converter to be added without removing or replacing the entire trim assembly, enabling incremental upgrades that reduce both cost and installation time while still providing bidirectional handle rotation capability.
3Adaptability or versatility
If bulky rotation converter mechanisms are installed, then bidirectional handle rotation is enabled, but the aesthetic appeal and sleek design are compromised
Solution Approach 1:
The rotation converter components are designed with compact geometries and are positioned within the existing trim assembly boundaries. The cam lobes are shaped to provide the necessary mechanical advantage while maintaining a compact profile, the follower is designed with a minimal footprint, and the shutdown mechanism uses compact detent features. This local optimization of component shapes and positions allows the rotation converter to maintain the sleek aesthetic of the trim assembly while enabling bidirectional rotation.
Data Source
AI summary
A rotation converter according to certain embodiments generally includes a case, an input member, a shuttle, and an output member. The input member is rotatably mounted to the case, and is rotatable from an input member home position in each of a first rotational direction and a second rotational direction. The shuttle is movably mounted in the case, and is engaged with the input member such that rotation of the input member from the input member home position in each of the first rotational direction and the second rotational direction drives the shuttle from a shuttle home position to a shuttle actuated position. The output member is rotatably mounted to the case and engaged with the shuttle such that the output member rotates in an output member rotational direction in response to movement of the shuttle from the shuttle home position to the shuttle actuated position.