Lockset Handle Coupler Asymmetry for Rotation Control
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Solution Overview
Problem
Existing lockset assemblies lack effective mechanisms to control the direction of handle rotation and secure orientation, leading to potential misalignment and difficulties in installation and operation.
Innovation Solution
The assembly incorporates interference members on the handle coupler and plate to prevent rotation in specific directions, with a rose housing and latchbolt retraction mechanism that includes a unique rotational orientation and a rack-and-pinion arrangement to ensure proper alignment and operation, along with features indicating the preferred orientation and multiple fastener apertures for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the housing is made attachable in both orientation and inverted orientation, then the adaptability of the lockset assembly is improved, but the control over handle rotation direction is lost
Solution Approach 1:
The patent applies asymmetry by providing two different interference members (first interference member and second interference member) that are positioned asymmetrically on the handle coupler. When the housing is mounted in the orientation, the first interference member engages with the first interference feature to prevent rotation in one direction. When the housing is mounted in the inverted orientation, the second interference member engages with the second interference feature to prevent rotation in the opposite direction. This asymmetric design allows the system to adapt to different mounting orientations while maintaining control over handle rotation direction.
2Reliability
If interference members are added to control handle rotation, then the reliability of operation is improved, but the device complexity increases
Solution Approach 1:
The patent merges the rotation control function into the existing mounting structure by integrating the interference members and interference features directly into the housing and handle coupler components that are already part of the lockset assembly. Rather than adding separate rotation control mechanisms, the interference members are combined with the mounting features, allowing the same structural elements to serve dual purposes: mounting the housing and controlling handle rotation direction.
3Ease of manufacture
If multiple fastener apertures are provided on the plate, then the ease of installation is improved, but the device complexity increases
Solution Approach 1:
The plate with multiple fastener apertures serves multiple functions: it provides structural support for mounting the housing, offers flexibility in installation positioning through multiple aperture options, and works in conjunction with the interference members to ensure proper orientation. The multiple apertures allow installers to choose the most convenient mounting positions while the overall plate design maintains compatibility with the rotation control mechanism.
Data Source
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AI summary
Disclosed herein is a latchbolt retractor (12). The latchbolt retractor (12) comprises a latchbolt retraction mechanism (30) mounted to a carriage (28). The latchbolt retraction mechanism (30) comprising a latchbolt assembly coupler (32) for operational coupling to a latchbolt assembly (22). The carriage (28) is configured to slide along at least one rail (14,16) for positioning the latchbolt assembly coupler (32) relative to the latchbolt.