Rack Lock Assembly With Inverted Gear Teeth Against Forced Retraction
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Solution Overview
Problem
Conventional locks for panel assemblies, such as doors and windows, lack sufficient security as intruders can force retract shootbolts without using the handle, compromising the locking mechanism's integrity.
Innovation Solution
A lock assembly design featuring racks and a gear system where the gear's teeth are angled less than 45° from the linear axis in the extended position, preventing linear force from retracting the racks without rotational movement, ensuring the handle is the sole means of retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional locks allow linear force to retract shootbolts, then ease of operation is improved, but security is worsened
Solution Approach 1:
The gear teeth are inverted in orientation compared to conventional locks, with the leading face angled at less than 45° to the linear axis. This inversion prevents linear force from retracting the shootbolts while still allowing the handle to operate the lock, thus resolving the contradiction between ease of operation and security.
Solution Approach 2:
The angle of the gear tooth leading face is changed to less than 45° relative to the linear axis of rack movement. This parameter change creates a mechanical condition where linear force cannot overcome the gear engagement, preventing unauthorized retraction while maintaining normal operation through rotational force.
2Reliability
If gear teeth are angled less than 45° from the linear axis, then security is improved, but ease of operation may be worsened
Solution Approach 1:
By inverting the gear tooth angle orientation to less than 45° from the linear axis, the mechanism allows easy rotational operation while blocking linear force. The inversion ensures that the force application method (rotation vs. linear push) determines whether the lock operates or resists, resolving the contradiction between security and ease of operation.
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
Enhances security by preventing unauthorized retraction of shootbolts, maintaining the locked state even when a deadlock is not engaged, thus providing higher security for panel assemblies.
Implementation Method 1
a gear coupled to the one or more racks; wherein the gear is configured such that, in an extended position of the one or more racks, the gear resists a linear force applied to a rack of the one or more racks from moving the rack towards the retracted position
Data Source
AI summary
A lock assembly comprising: one or more racks, each rack being configured to move along a linear axis between a respective extended position and a respective retracted position; and a drive hub coupled to the one or more racks; wherein the drive hub is configured such that, in an extended position of the one or more racks, the drive hub resists a linear force applied to a rack of the one or more racks from moving the rack towards the retracted position. A lock assembly comprising: one or more racks, each rack being configured to move along a linear axis between a respective extended position and a respective retracted position; and a drive hub having one or more engagement means, each engagement means configured to engage with the one or more racks; wherein in an extended position of the rack, at least one of the one or more engagement means is at an angle of less than 45° from the linear axis.