Door lock assembly
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Solution Overview
Problem
Existing door lock assemblies for electrical apparatuses, such as dryers, do not provide a safe and convenient mechanism for opening the door from the inside, particularly in scenarios where children may accidentally be locked inside.
Innovation Solution
The door lock assembly incorporates a cam, slider, and pin assembly with a heart-shaped movement path and an alternative release guide groove, allowing the door to be opened from the inside by applying an outward force when the door is closed, thus ensuring safety and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional door lock assembly is used, then the door can be reliably locked and opened from the outside, but the door cannot be opened from the inside when closed
Solution Approach 1:
The movement path of the pin assembly is segmented into multiple segments: a first segment allowing movement when the door is open, a second segment allowing movement when the door is closed, and an alternative segment providing an emergency opening path. This segmentation enables the door lock to respond differently to opening forces depending on the door state, resolving the contradiction between reliable locking and interior opening capability.
Solution Approach 2:
The door lock assembly dynamically changes its mechanical constraints based on the door's opening/closing state. When the door is closed, the pin assembly is constrained to prevent opening. When the door is open or in specific states, the pin assembly can move along alternative paths to enable opening. This dynamic behavior resolves the contradiction by making the locking mechanism adaptive rather than static.
2Reliability
If the door is securely locked from the outside, then the door remains closed, but it becomes impossible to open the door from the inside in emergency situations
Solution Approach 1:
The door lock assembly is designed with preliminary safety considerations built into its structure. The alternative movement path for the pin assembly is pre-configured to allow emergency opening from the inside. This preliminary design ensures that even when the door is securely locked, a safety release mechanism is inherently available, preventing asphyxiation risk without compromising normal locking reliability.
Solution Approach 2:
The pin assembly acts as an intermediary element that mediates between the locking mechanism and the door. It can selectively engage with different movement paths (conventional or alternative) depending on the situation. This intermediary component enables the transition from a secure locked state to an emergency opening state, resolving the contradiction between security and safety.
3Device complexity
If a simple push-push mechanism is used, then the door can be opened from the outside, but it lacks the capability for push-pull operation and interior opening
Solution Approach 1:
The door lock assembly is designed with multi-functionality to handle various opening scenarios. The same basic mechanism supports both conventional push-push operation from the outside and push-pull operation from the inside by utilizing different segments of the pin assembly's movement path. This universal design resolves the contradiction by making the lock mechanism versatile without proportionally increasing its complexity.
Data Source
AI summary
A door lock assembly, including a cam, a slider and a pin assembly. The cam can rotate clockwise or counterclockwise about a camshaft, and the slider fits and engages with the cam, so when the cam rotates, the slider reciprocates in the length direction of the slider with the rotation. The slider is provided with a movement guide groove which defines a conventional movement path including a first and second segment of the conventional movement path. An end of the pin assembly can move relative to the slider in the conventional movement path with the reciprocation of the slider. The movement guide groove further defines an alternative movement path, and the end of the pin assembly can move relative to the slider in the first segment of the conventional movement path and the alternative movement path defined by the movement guide groove with the reciprocation of the slider, but does not move in the second segment of the conventional movement path.