Privacy Lock with Offset Toggle and Camming Motion
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Solution Overview
Problem
Conventional privacy locks lack an effective emergency exit feature that allows users to unlock the door from the inside without external assistance, compromising security and flexibility in design.
Innovation Solution
A privacy lock assembly with a spindle and spring housings that enables unlocking through a camming motion from the interior handle, allowing the toggle to translate out of engagement with the locking piece, and an exterior key for emergency access, maintaining handles in a predetermined orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a privacy lock is designed with a simple interior release mechanism, then ease of operation is improved, but security is worsened because the door cannot be locked from the inside
Solution Approach 1:
The lock mechanism transitions between locked and unlocked states dynamically. The toggle switch can be positioned in different states (locked, unlocked, emergency exit) and the locking piece can engage or disengage from the toggle tail piece based on the position of the interior handle, allowing the system to adapt its security level based on operational needs
Solution Approach 2:
Different parts of the lock mechanism have different functions: the exterior handle and key provide security locking, while the interior handle provides emergency exit capability. The locking piece selectively engages with the toggle tail piece only when the interior handle is in the locked position, creating localized security control
2Reliability
If a privacy lock is designed to prevent interior unlocking, then security is improved, but emergency exit capability is worsened
Solution Approach 1:
The mechanism dynamically responds to the position of the interior handle. When the interior handle is pulled toward the user (unlocked position), the locking piece disengages from the toggle tail piece, allowing emergency exit. When the interior handle is pushed away (locked position), the locking piece engages with the toggle tail piece, providing security
Solution Approach 2:
The locking piece acts as an intermediary between the interior handle mechanism and the toggle switch. It translates the position of the interior handle into corresponding locked or unlocked states by selectively engaging or disengaging from the toggle tail piece, enabling both security and emergency exit functions
3Device complexity
If the toggle is positioned on the central axis, then device complexity is reduced, but the locking mechanism effectiveness is worsened due to insufficient camming action
Solution Approach 1:
The toggle is intentionally positioned offset from the central axis of the lock body, creating an asymmetric arrangement. This offset position enables effective camming action when the interior handle is operated, as the toggle's movement path creates a mechanical advantage that reliably engages or disengages the locking piece from the toggle tail piece
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
Provides a secure locked position while enabling an emergency exit feature by allowing interior handle operation for unlocking and maintaining handle orientation through spring housings, enhancing user safety and flexibility in design.
Implementation Method 1
The interior spring housing and the exterior housing each have compression springs
Implementation Method 2
means for unlocking the lock assembly from the interior portion by a camming motion so that the toggle is translated out of engagement with the locking piece
Data Source
AI summary
A privacy lock assembly and method of operation are provided. The lock assembly has a push button offset from the central axis of the lock assembly for locking and unlocking the assembly. The lock assembly includes compression springs to maintain integrated handles in predetermined orientations when the handles are not subject to a load.