Door Knob Assembly Linear Actuation Mechanism
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Solution Overview
Problem
Conventional door knobs and latches require users to turn them to open, close, lock, or unlock doors, which can be inconvenient, especially for those with mobility or dexterity issues.
Innovation Solution
A door knob assembly that allows for opening, closing, locking, and unlocking without turning, utilizing a stationary outside door knob, an actuating inside door knob, and a locking body with a sliding locking shaft and adjustable locking nut, allowing the door to be operated by pulling or pushing the knobs, with a system of concentric escutcheons and threaded coupling elements for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional door knob is used, then the door can be locked and unlocked, but the user must turn the knob which is difficult for those with mobility or dexterity issues
Solution Approach 1:
The patent inverts the conventional door knob operation by making the outside knob stationary and the inside knob movable. Instead of turning the outside knob to retract the latch, the user pushes or pulls the inside knob linearly, which moves the latch horizontally to lock or unlock the door. This inversion eliminates the need for rotational motion on the outside, making it accessible for users with mobility or dexterity issues.
Solution Approach 2:
The patent introduces dynamic elements including a movable inside knob that slides linearly, a retractable latch mechanism that moves horizontally, and a spring-loaded system that automatically returns the latch to its locked position. These dynamic components replace the static turning motion of conventional knobs with adaptive linear motion that is easier to operate for users with limited hand strength or dexterity.
2Ease of operation
If the inside door knob is made movable to enable easy operation, then accessibility is improved, but the structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into integrated components: the movable inside knob is directly connected to the latch mechanism through a series of linked components (knob, bar, bearing, divot, locking rod, nut), creating a unified system where one linear motion performs both knob actuation and latch retraction. This consolidation reduces the need for separate mechanisms and simplifies the overall structure despite the added mobility.
Solution Approach 2:
The spring-loaded mechanism automatically returns the latch to its locked position after being retracted, eliminating the need for a separate return mechanism. The system serves itself by using the spring's stored energy to reset the locking state, reducing complexity compared to systems requiring manual return or additional actuation mechanisms.
3Ease of operation
If a stationary outside door knob is used, then the operation is simplified, but the mechanism for achieving locking/unlocking must be more complex
Solution Approach 1:
The patent introduces several intermediary components that transfer the linear motion from the inside knob to the latch mechanism. These include the bar connected to the knob, the bearing that converts linear to horizontal motion, the divot that guides the bearing, and the locking rod with nut that actuates the latch. These intermediaries distribute the mechanical work across multiple simple components rather than requiring a single complex mechanism.
Solution Approach 2:
The locking mechanism is segmented into distinct functional components: the inside knob for actuation, the bar and bearing for motion conversion, the locking rod and nut for transmission, and the latch for final engagement. This segmentation allows each component to perform a simple, well-defined function, reducing overall complexity despite the multiple parts involved.
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 easy operation of doors without the need for turning, enhancing accessibility and convenience by allowing doors to be opened, closed, locked, and unlocked through simple pulling or pushing motions, while maintaining security through the locking mechanism.
Implementation Method 1
a spring positioned between the rear surface of the locking shaft and the partially enclosed back end of the hollow casing
Implementation Method 2
two threaded coupling elements attached to the interior surface of the escutcheon. The coupling elements extend toward the opening on the inside surface
Implementation Method 3
When slidable bar passes through the hole in the bar sleeve the depressible bearing encounters the divit and thrusts up into it. This functions to hold the knob in the contracted position.
Data Source
AI summary
A new door knob assembly for allowing a door to be opened easily without the need to turn a knob. The assembly includes an outside door knob and an actuating inside door knob respectively positioned within openings on the outside and inside surfaces of a door. A locking body which communicates with the door knobs is positioned in an opening on the side edge of the door. The locking body has a locking shaft with a locking head on one end which protrudes from the side edge and retracts into the door. On the other end, engagement arms are fitted with obstruction openings. A locking rod which extends in from the inside knob has a locking nut which when positioned in the obstruction openings prevents the locking head from retracting into the door. When the locking nut is moved out of the obstruction openings by actuating the inside knob the locking head can retract into the door.