Portable Door Lock Eccentric Cam Mechanism
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Solution Overview
Problem
Existing security devices for doors are not easy to use, understand, or robust enough to prevent unwanted intrusion, as they often require permanent affixation and lack simplicity and effectiveness.
Innovation Solution
A portable door lock with a body featuring a bottom ledge, eccentric cam, and sliding member that applies pressure between the door and floor using a spring-biased mechanism, allowing for easy installation and enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent affixation devices are used (such as lever-flip mechanisms or rack and pinion gear sets), then the security and robustness of the door lock is improved, but the ease of installation and portability deteriorates due to requiring permanent mounting
Solution Approach 1:
The door lock device is designed to be self-sufficient with no installation required. The device features a self-contained structure where the housing engages directly with the door edge, and the cam mechanism is internally integrated. The spring-loaded cam automatically engages with the door when the handle is actuated, eliminating the need for permanent affixation or external mounting hardware.
2Reliability
If complex mechanisms like rack and pinion gear sets are used, then the locking reliability is improved, but the device complexity and ease of understanding deteriorates
Solution Approach 1:
The invention extracts and eliminates the complex rack and pinion gear sets from the door lock mechanism. Instead, it uses a simplified cam-and-follower system where a rotating cam directly translates rotational motion from the handle into linear motion of the locking bolt. This extraction of unnecessary complexity maintains locking reliability while dramatically simplifying the overall mechanism.
Solution Approach 2:
Rather than using a complex gear system to convert rotational motion to linear motion, the invention inverts the approach by using a cam profile that directly translates rotation into the desired linear movement of the locking bolt. The cam's geometric profile inherently provides the motion transformation, eliminating the need for intermediate gear components.
3Ease of operation
If simple wedge-based temporary devices are used, then the ease of installation is improved, but the security robustness and ability to prevent intrusion deteriorates
Solution Approach 1:
The door lock employs a dynamic spring-loaded cam mechanism that automatically adjusts to the door's position and applies optimized locking force. When the handle is rotated, the cam rotates and pushes the locking bolt forward with spring-assisted force, creating a dynamic engagement that adapts to variations in door thickness and positioning. This dynamic mechanism provides robust security while maintaining easy 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
The device provides a user-friendly and robust security solution by immobilizing the door with adjustable pressure, preventing unauthorized access while being easy to install and compact for storage.
Implementation Method 1
The device has a spring biasing the driven surface of the sliding member towards the faceted perimeter of the eccentric cam
Implementation Method 2
The eccentric cam is rotatably affixed to the body and rotatable about an eccentric axis that is offset from said geometric center
Implementation Method 3
The device has an arm affixed to the eccentric cam to rotate the eccentric cam about the eccentric axis
Data Source
AI summary
A door locking device has a body with an overhanging ledge to mate with a bottom edge of a door. The body has a sliding member that is captured to the body and an eccentric cam with a faceted perimeter surface that rotates about an eccentric axis. When the eccentric cam rotates, the sliding member is moved from a retracted position toward an extended position. The sliding member has a foot portion that contacts a portion of the floor to lock the door by applying pressure between the floor and the bottom edge of the door. An arm is affixed to the eccentric cam and has a folding handle.