Reversible Cam Door Lock Mechanism for Bidirectional Handle Operation
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Solution Overview
Problem
Existing door unlocking mechanisms are not easily adaptable to allow door handle rotation in either clockwise or counterclockwise directions, limiting flexibility and reliability in door access from both sides.
Innovation Solution
A reversible cam mechanism integrated into the door latch system, allowing the cam to rotate in both directions and transmit motion to a displaceable slider, enabling the latch to be operated by either handle direction, with a spring-assisted pivot and cam actuating pin system for secure and reversible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed cam mechanism is used in the door latch system, then the structure is simple and reliable, but the door handle can only rotate in one direction (either clockwise or counterclockwise)
Solution Approach 1:
The cam mechanism is designed to be reversible, allowing it to rotate in both clockwise and counterclockwise directions depending on the door handle rotation direction. The cam includes a through slot with a cam actuating pin that can engage with the slot at different positions, enabling the cam to dynamically adapt to different rotation directions while maintaining a relatively simple overall structure.
2Adaptability or versatility
If a reversible cam mechanism is implemented to allow bidirectional door handle rotation, then adaptability is improved, but the device complexity increases
Solution Approach 1:
The reversible cam mechanism serves multiple functions: it accommodates both clockwise and counterclockwise door handle rotations, transmits motion to the slider in either direction, and maintains secure locking in both rotational directions. This multi-functionality is achieved through the cam's through slot design and the interaction with the cam actuating pin, allowing a single mechanism to handle various operational scenarios without requiring separate mechanisms for each direction.
3Reliability
If a spring is added to urge the cam in the direction of its axis to accommodate position reversal, then reliability is improved, but the device complexity and number of components increase
Solution Approach 1:
The spring is pre-configured to urge the cam in the direction of its axis, preparing the cam for reliable position reversal when needed. This preliminary positioning action ensures that the cam is always ready to reverse to the correct position, improving reliability without requiring complex control mechanisms. The spring's pre-loaded state provides automatic positioning assistance.
4Adaptability or versatility
If the cam actuating pin is positioned in offset relation to the cam pivot axis, then the mechanism allows reversible cam rotation, but the manufacturing precision requirements increase
Solution Approach 1:
The cam actuating pin is deliberately positioned in offset relation to the cam pivot axis, creating an asymmetric configuration that enables reversible cam rotation. This offset positioning allows the cam to rotate in both directions while maintaining proper engagement. The asymmetric design is intentional and provides the necessary mechanical advantage for bidirectional operation, with the offset distance being a design parameter that can be optimized for manufacturing.
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
Enables reliable and flexible door access by accommodating 'left handed' or 'right handed' door handle operations, ensuring secure locking and easy opening with either handle direction, and allows for both manual and electrically actuated operation.
Implementation Method 1
a spring may be provided to bodily urge the cam in the direction of an axis of cam pivoting, to accommodate cam position reversal, upon installation
Implementation Method 2
a rotatable cam having reversible positions in each of which motion is transmitted to the displaceable structure in response to displacement of the respective components
Implementation Method 3
an electrically actuated device, including a solenoid
Data Source
AI summary
In combination a door, latch structure at an edge of the door, and independently opens the door latch operating components at opposite sides of the door, displaceable structure in the door having a position blocking movement of the latch structure, first means responsive to displacement of a selected one of the components for displacing the structure from the blocking position to allow movement of the latch structure, for door opening, and the first means including a rotatable cam having reversible positions in each of which motion is transmitted to the displacement structure in response to displacement of the respective components.