Two-Point Door Lock with Mishandling Pin
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Solution Overview
Problem
Existing locks for sliding doors and windows often fail to prevent security hooks from slamming into the striker before the door or window is fully closed, due to the lack of effective mechanisms to control the rotation of security hooks.
Innovation Solution
A two-point lock system featuring pivotally mounted security hooks with sliding faces that engage a spring-loaded mishandling pin, which is vertically retracted when the door or window is fully closed, allowing the hooks to rotate and lock onto a striker, and disengaging to prevent premature contact with the striker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security hooks are allowed to rotate freely to lock onto the striker, then the locking function is achieved, but the hooks may slam into the striker before the door is fully closed causing damage
Solution Approach 1:
A control rod is introduced as an intermediary mechanism between the security hooks and the striker. The control rod includes a cam surface that interacts with a cam follower on the security hook, mediating the rotation motion to ensure hooks only engage with the striker when the door is properly closed, preventing premature impact damage.
Solution Approach 2:
The control rod performs preliminary action by regulating the rotation of security hooks before they can slam into the striker. The cam surface and cam follower mechanism预先 controls the hook's movement path, ensuring that engagement with the striker only occurs when the door is fully closed, preventing harmful impact.
2Object-affected harmful factors
If a mechanism is added to control security hook rotation, then premature impact is prevented, but the device complexity increases
Solution Approach 1:
The control rod serves multiple functions: it acts as a rotation control mechanism to prevent premature hook engagement, serves as a structural link between the door frame and security hooks, and provides guidance for hook movement. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The control rod combines several functions into a single component: it integrates the rotation control function, the structural support function, and the motion guidance function. By merging these functions into one element, the overall device complexity is minimized while still achieving the goal of preventing impact damage.
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 system effectively prevents security hooks from slamming into the striker before the door or window is fully closed, ensuring secure locking and reducing wear on the locking mechanism.
Implementation Method 1
a spring-loaded mishandling pin, which is vertically retracted when the door or window is fully closed
Data Source
AI summary
A two point lock includes two pivotally mounted security hooks having sliding faces that engage sliding faces of a spring-loaded mishandling pin when the mishandling pin is vertically extended and the security hooks are rotatably retracted. The mishandling pin is vertically retracted when it abuts a jamb. When the mishandling pin is vertically retracted, the sliding faces disengage so that the security hooks can rotate to lock onto a striker on the jamb. Thus, the mishandling pin prevents the security hooks from being slammed into the striker before a door or a window is fully closed.