Corrosion-Resistant Brass Insert for Padlock Attack Resistance
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Solution Overview
Problem
Existing combination padlocks lack sufficient reinforcement and corrosion resistance, particularly in the region where dials and shafts are located, making them vulnerable to external forces and manipulation attempts, and the assembly process is complex due to the narrow, chunky inserts used in current designs.
Innovation Solution
A corrosion-resistant brass insert with an open configuration, formed by stamping, is designed to extend along the front side of the pivotally movable blocking member, providing support and resistance without sandwiching it, and simplifying the assembly process by allowing the insert and blocking member to be dropped into the frame simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chunky, cast zinc metal insert is used to substantially fill the frame defined space and closely sandwich the blocking member, then attack resistance is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The insert is divided into multiple functional elements: a frame-defined-space-filling portion, a blocking-member-sandwiching portion, and integrated dial support structures. This segmentation allows each element to perform its specific function while simplifying the overall assembly process, as the insert can be installed as a single piece that automatically positions itself correctly within the padlock housing.
Solution Approach 2:
The insert combines multiple protective functions into a single integrated component: it fills the frame defined space, sandwiches the blocking member, supports the dials, and provides attack resistance. This merging eliminates the need for separate components for each function, thereby reducing device complexity and simplifying assembly while maintaining comprehensive protection.
2Reliability
If a narrow throat insert is used to closely sandwich the blocking member, then manipulation resistance is improved, but corrosion resistance worsens due to trapped moisture
Solution Approach 1:
The insert features a wide throat portion that provides manipulation resistance through its geometric configuration rather than narrow confinement. The blocking member is restrained by the overall shape and positioning features of the insert, not by a constricting narrow throat. This local quality change eliminates the corrosion-prone narrow throat while maintaining the necessary restraint on the blocking member through strategically positioned geometric features.
Solution Approach 2:
Instead of using a narrow throat to restrain the blocking member, the invention inverts the approach by using a wide throat with strategic geometric features that provide restraint. The blocking member is constrained by the overall configuration and positioning elements of the insert rather than by a constricting passage, thereby eliminating the corrosion issue while maintaining security.
3Strength
If multiple separate components are used to support dials and blocking members, then structural integrity is improved, but assembly time increases
Solution Approach 1:
The insert merges the functions of supporting dials, restraining the blocking member, and filling the frame defined space into a single integrated component. This consolidation maintains structural integrity by providing comprehensive support and restraint through the insert's geometric features, while dramatically reducing assembly time by eliminating the need to install multiple separate components.
Solution Approach 2:
The insert is pre-configured with integrated features for dial support, blocking member restraint, and frame space filling. This preliminary action of integrating all necessary functional elements into a single component before installation eliminates the need for complex assembly steps, allowing the entire support and restraint system to be installed in one operation.
4Strength
If a cast zinc metal insert is used, then attack resistance is improved, but corrosion resistance worsens
Solution Approach 1:
The invention changes the material parameter from cast zinc metal to a different material composition that provides both attack resistance and corrosion resistance. The new material maintains the structural strength needed for attack resistance while being inherently resistant to corrosion, eliminating the trade-off between these two properties.
Solution Approach 2:
The insert utilizes composite material properties or a specially formulated alloy that combines the strength characteristics of metal with enhanced corrosion resistance. This composite approach allows the insert to provide robust attack resistance while simultaneously resisting corrosion from moisture and environmental factors, eliminating the need to choose between strength and corrosion resistance.
Data Source
AI summary
A combination operated padlock has indicia carrying dials that are turned to set a combination for unlocking a shackle of the padlock. Operating components of the padlock are carried by or within a housing-enclosed frame of the padlock. A strong, corrosion resistant insert, preferably formed from brass of uniform thickness, is configured to fit cleverly around and among the movable operating components to strengthen the padlock and to prevent operating component manipulation if an unauthorized unlocking of the padlock is attempted. In a preferred embodiment, the insert has two substantially identical question-mark-shaped tines configured to extend toward and between different adjacent pairs of the dials that are turned to set a combination.