Wafer-Tumbler Cam Locks With Modular Plugs and Retainer Clips
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Solution Overview
Problem
Existing wafer-tumbler cam locks for cabinets are challenging to install without specialized tools and require a large inventory of parts to accommodate different cabinet thicknesses, leading to increased manufacturing costs and complexity.
Innovation Solution
A method for packaging cam locks with uniformly sized plugs, adapters of varying lengths, and cylinder housings that allow for easy installation without keys or tools, using retainer clips to secure components in place, reducing the part count and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional wafer-tumbler cam locks are designed with directly connected plugs and cams, then the lock provides basic security functionality, but the installation becomes challenging requiring specialized tools and key insertion to place tumblers in unlocked configuration
Solution Approach 1:
The lock is divided into separate modular components: the plug with wafer tumblers, the cam mechanism, and the cylinder housing. These segments can be independently assembled and installed, allowing the plug to be inserted into the housing first, then the cam attached separately to the rear of the plug, eliminating the need for specialized installation tools
Solution Approach 2:
The plug is pre-assembled with the wafer tumblers in the correct positions within the cylinder housing before final cam attachment. This preliminary arrangement of components in the unlocked configuration allows subsequent easy attachment of the cam without requiring key insertion during installation
2Adaptability or versatility
If cam locks are manufactured in various lengths to accommodate different cabinet thicknesses, then the locks become adaptable to different applications, but the inventory requirements and manufacturing costs increase significantly
Solution Approach 1:
A single universal plug design with standardized dimensions and mounting features can be used across all cam lock variants regardless of the required lock length. The plug serves multiple functions: housing the wafer tumblers, providing the key interface, and serving as the mounting interface for the cam. This universality eliminates the need to manufacture different plug lengths for different cabinet thicknesses
Solution Approach 2:
Instead of varying the plug length to accommodate different cabinet thicknesses, the adaptation is achieved by varying the cam length and its attachment position relative to the plug. The solution moves the variability from the plug dimension to the cam dimension, allowing a standardized plug to work with multiple cam length variants
3Strength
If the cam is fastened directly to the rear end portion of the plug, then the lock provides secure fastening, but the installer must use both hands to operate the key while simultaneously fastening the cam to the plug
Solution Approach 1:
The plug is designed with an integrated rear opening that provides self-alignment features and a built-in mounting interface for the cam. The cam includes corresponding alignment features that automatically position it correctly relative to the plug during attachment, eliminating the need for the installer to manually align components while simultaneously operating the key
Data Source
AI summary
A cam lock for cabinets adaptable to cabinet drawers and doors of various thicknesses is disclosed. The cam lock includes a cam, a plug, an adapter, and a cylinder housing. The plug has a keyway and tumblers in communication with the keyway. The adapter is configured to couple to the cam and the plug. The cylinder housing is configured to receive the plug and the adapter. The retainer clip is configured to extend through the cylinder housing into registry with the plug after the plug and adapter are inserted into the cylinder to thereby retain both the plug and the adapter in the cylinder housing, whereby installation of the cam lock in the cabinet is simplified.