Door Locking Device with Cam-Actuated Blocking Lever
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Solution Overview
Problem
Existing door locking mechanisms fail to prevent doors from opening unintentionally during side collisions due to inertial forces, as the timing difference between the blocking lever's operation and the outside lever's pulling can still result in door opening.
Innovation Solution
A door locking device featuring a base with an outside lever and door latch, a guide part with alternating long and short grooves, a rotator with ribs, and a cap-shaped button with a triangular wave cam surface, where the blocking lever is interposed between the door latch and extending part to prevent door opening, and a method involving the rotator's rotation and cam surface interaction to secure the blocking lever during external shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking lever is used to prevent door opening during side collision, then door safety is improved, but timing synchronization between blocking lever operation and outside lever pulling cannot be ensured
Solution Approach 1:
The rotator is pre-positioned with its ribs aligned to the cam surface grooves before collision occurs. During collision, the cam surface automatically engages the rotator ribs, immediately activating the blocking lever without requiring timing coordination with the outside lever pulling action.
Solution Approach 2:
The cam surface acts as an intermediary mechanism that translates the rotational movement of the rotator directly into blocking lever activation. This mechanical mediation ensures immediate and reliable blocking lever engagement regardless of the outside lever's pulling timing.
2Ease of operation
If the blocking lever is made movable to allow normal door operation, then ease of operation is improved, but the blocking lever may fail to remain fixed during collision
Solution Approach 1:
The blocking lever transitions from a static fixed position to a dynamic movable position through the rotator's rotation. During normal operation, the lever moves freely to allow door opening. During collision, the cam surface engages the rotator ribs, dynamically locking the blocking lever in its blocking position to prevent door opening.
Solution Approach 2:
The system changes the positional parameter of the blocking lever based on collision conditions. The rotator's rotation angle changes from a neutral position during normal operation to an engaged position during collision, which in turn changes the blocking lever's position from movable to fixed, ensuring both ease of operation and stability when needed.
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
Effectively prevents door opening during side collisions by fixing the blocking lever's position with the rotator's movement along the cam surface, ensuring the door remains closed until the collision ends and the lever returns to its original position.
Implementation Method 1
The cap-shaped button has a continuous cam surface, which has a regularly varying height and a triangular wave shape, on the first bottom surface. A blocking lever is connected to a first upper end of the cap-shaped button and pivotably mounted to the base. A second upper end of the long rib is slanted and adheres to the continuous cam surface of the cap-shaped button
Implementation Method 2
A second upper end of the long rib is slanted and adheres to the continuous cam surface of the cap-shaped button
Data Source
AI summary
A door locking device for preventing a door from opening during a side collision comprises a base having one surface provided with an outside lever and another surface provided with a door latch to extend from the outside lever to contact an extending part which has a guide part extended through the base to be horizontal with the extending part. An inner side part of the guide part has a plurality of long grooves and a plurality of short grooves which are horizontal with the extending part. A rotator is inserted into the guide part and has a plurality of long ribs and a plurality of short ribs. A cap-shaped button has a bottom surface in contact with the plurality of long ribs. A blocking lever is linked to en upper end of the button and pivotably mounted in the base.