Side Mounted Privacy Lock with Segmented Spindle Actuation
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Solution Overview
Problem
Existing privacy locks for residential doors often lack a secure mechanism to differentiate between inside and outside access, failing to provide adequate privacy functions when mounted to the lock chassis rather than the knob or lever.
Innovation Solution
A door lock system with a latch assembly and actuator mechanism that includes an inside and outside spindle, a privacy selector, and a locking plate, allowing for selective operation of the latch assembly from either side while enabling a privacy position that inhibits outside operation, ensuring secure inside access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a privacy lock is mounted to the lock chassis rather than the knob or lever, then the structural stability and security are improved, but the mechanism becomes more complex and requires additional components to differentiate inside/outside access
Solution Approach 1:
The lock mechanism is divided into separate inside and outside housings with distinct actuators (spindles). The inside actuator includes a privacy selector that can lock the outside actuator, creating segmented control zones that improve security while maintaining manageable complexity through functional separation.
Solution Approach 2:
A privacy selector mechanism acts as an intermediary between the inside actuator and the latch assembly. This intermediary component controls whether the outside actuator can influence the latch, providing the needed security differentiation without requiring a completely complex electronic system.
2Adaptability or versatility
If a privacy selector mechanism is added to differentiate inside and outside access, then the privacy function is improved, but the device complexity and number of components increase
Solution Approach 1:
The privacy selector is merged with the inside actuator assembly, sharing common mounting structures and linkage mechanisms. This integration allows the privacy function to be added without proportionally increasing overall device complexity, as multiple functions share common hardware components.
Solution Approach 2:
The privacy selector serves multiple functions: it controls the locking state, provides visual feedback through its position, and works with the existing inside actuator mechanism. This multi-functionality reduces the need for separate dedicated components for each function.
3Ease of manufacture
If the privacy locking mechanism is disposed within the outside housing nearer to the outside surface, then the ease of manufacture and assembly is improved, but the space allocation within the door thickness becomes more constrained
Solution Approach 1:
The privacy locking mechanism is positioned in the outside housing rather than the inside housing, utilizing the door thickness dimension from the outside. This dimensional repositioning allows for easier access during assembly and manufacturing while still providing adequate space within the door structure.
Data Source
AI summary
A door lock includes a latch assembly positioned at least partially within the door and movable between an engaged position in which the door is held in a closed position and a disengaged position in which the door is movable from a closed position to an open position. An outside spindle is rotatable about an axis and an inside spindle is rotatable about the axis to move the latch assembly between the engaged position and the disengaged position. A locking plate is movable along the axis between a locked position in which the outside spindle is fixed and an unlocked position in which the outside spindle and the inside spindle are each rotatable and a privacy lock actuator positioned on the inside of the door and movable in a direction substantially normal to the axis to move the locking plate between the locked position and the unlocked position.