Self-lock Module Retrofit for Automatic Cam Latching
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Solution Overview
Problem
Existing locks lack a self-locking feature that automatically relocks upon closure, which can lead to damage from forcible contact with fixed cams and does not provide the desired automatic relocking functionality in various applications.
Innovation Solution
A self-contained module with a rotatable inner axle and torsion spring is integrated with a preexisting lock, allowing it to automatically return to a locked position after being released by the user, and can be combined with cam locking components for slam-latching functionality, enabling automatic relocking without manual rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preexisting lock is used without self-locking feature, then the lock structure is simple and easy to manufacture, but the lock cannot automatically relock upon closure leading to potential damage from forcible contact with fixed cam
Solution Approach 1:
The self-locking module is nested within the preexisting lock structure. The inner axle with torsion spring is housed inside the outer housing, which then attaches to the existing lock body. This nesting approach allows the self-locking functionality to be integrated without completely redesigning the original lock, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The torsion spring provides self-service by automatically returning the inner axle to its initial position after rotation, thereby automatically relocking the mechanism without requiring external intervention or additional power sources. This self-service mechanism ensures reliable automatic relocking while keeping the device structure relatively simple.
2Object-affected harmful factors
If a fixed cam is used in the lock mechanism, then the cam locking feature is simple and reliable, but the fixed cam is susceptible to damage from forcible contact
Solution Approach 1:
The cam is changed from a fixed position to a movable position by mounting it on the rotatable inner axle. This dynamic cam can now rotate along with the inner axle and return to its protected position automatically, reducing damage from forcible contact while maintaining the simplicity of the cam locking feature through the self-service torsion spring mechanism.
Solution Approach 2:
The torsion spring provides beforehand cushioning by storing elastic potential energy during rotation and releasing it to automatically return the cam to its protected position before forcible contact can cause damage. This pre-positioning mechanism protects the cam from harm while adding minimal complexity to the overall system.
3Ease of operation
If manual rotation of lock is required after each use, then the lock mechanism is simple, but the operation is time-consuming and inconvenient
Solution Approach 1:
The torsion spring-based inner axle provides self-service by automatically returning to its initial locked position after being rotated during the unlocking operation. This eliminates the need for manual rotation back to locked position, significantly improving ease of operation and reducing the time lost in locking operations without adding complex mechanisms.
4Extent of automation
If a self-locking module with torsion spring is added to preexisting lock, then automatic relocking functionality is achieved, but the device complexity increases
Solution Approach 1:
The self-locking module uses a nested structure where the inner axle with torsion spring is housed within an outer housing that attaches to the preexisting lock. This nesting consolidates multiple components into a compact integrated unit, achieving automatic relocking automation while minimizing the increase in overall device complexity through space-efficient design.
Solution Approach 2:
The self-locking module is designed with universal attachment features that can interface with various preexisting lock types. The outer housing includes mounting structures that can adapt to different lock configurations, allowing the same module design to provide automatic relocking automation across multiple applications without requiring complex customization for each specific lock type.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The module effectively prevents damage from forcible contact and provides automatic relocking functionality to preexisting locks, enhancing security and convenience by allowing users to open and close enclosures without manually locking the door or drawer.
Implementation Method 1
a torsion spring situated between and associated with such outer housing and such inner axle so that rotation of such inner axle within such outer housing by rotation of the preexisting lock by a user to an unlocked position thereof causes storage of torsional energy in such spring. Per the subject arrangement, such torsional energy causes the preexisting lock to automatically return to a locked position thereof whenever released by a user of the preexisting lock.
Data Source
AI summary
Disclosed are apparatus and corresponding methodology for the attachment of a self-contained module to any mechanical lock having a mating feature to accept it (in either of an OEM application or as a retrofit). The module enables a separate (preexisting) cam locking feature (components) to be associated with an existing mechanical lock by being fitted onto the back of the existing lock and then having the cam locking components attached to the module. In turn, the preexisting cam locking components may be fitted to the module aligned in any one of four positions (up, down, left, and right) on the back of the module for latching in any position in which the associated lock/cam strike may be installed. The cam locking components then function to allow a user to open an associated door or drawer, and when finished, slam it shut without having to rotate the lock back to a locked position. The self-contained module allows the cam locking components to be fitted to a standard, mechanical lock and still have the self-lock feature that is otherwise not available within the existing lock.