Tool-Free Pawl Assembly for Latch Mechanisms
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Solution Overview
Problem
Existing pawls for latch mechanisms require the use of common hand tools for installation and adjustment due to their design, which involves nuts and lock washers, making the process cumbersome and tool-dependent.
Innovation Solution
A pawl assembly with a shaft-engaging portion featuring interrupted female threads and a clip that allows for secure attachment to the output shaft without the need for tools, utilizing spring clip arms and cantilever tabs to prevent relative rotation and rectilinear motion, enabling easy installation and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nuts and lock washers are used to attach the pawl to the output shaft, then secure fastening is achieved, but tool dependency and installation complexity increase
Solution Approach 1:
The patent removes nuts and lock washers from the assembly, replacing them with a clip member that integrates the fastening function directly into the pawl structure. This extraction of unnecessary components eliminates tool dependency while maintaining secure attachment.
Solution Approach 2:
The clip member is designed to be manually installed and adjusted without requiring external tools. The spring-loaded arms and cantilever tabs provide self-contained fastening capability, allowing the pawl to secure itself to the output shaft through simple manual manipulation.
2Strength
If multiple components (nuts, washers, clips) are used for attachment, then secure fastening is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple separate components (nuts, washers, and clip elements) into a single integrated clip member. This consolidation reduces the total number of parts while maintaining all necessary fastening functions, thereby reducing device complexity.
Solution Approach 2:
The clip member serves multiple functions simultaneously: it provides secure attachment to the output shaft, allows for easy installation, enables adjustment of the pawl position, and prevents relative rotation. This multi-functionality eliminates the need for separate specialized components for each function.
3Ease of operation
If a simple attachment method is used, then ease of installation is improved, but reliability of connection may worsen
Solution Approach 1:
The cantilever tabs are designed with curved surfaces that mate with corresponding features on the output shaft. This curved geometry provides automatic alignment and ensures reliable mechanical engagement while maintaining simple manual installation, preventing relative rotation between the pawl and shaft.
Solution Approach 2:
The spring clip arms utilize elastic deformation as a key parameter, allowing them to flex during installation and then maintain constant contact pressure against the output shaft. This elastic parameter change ensures reliable connection while enabling tool-free installation through simple compression and release actions.
Data Source
AI summary
A pawl assembly that can be installed to the output shaft of a latch mechanism more easily, and in some embodiments without the use of tools, as compared to prior art pawls.