Door Handle Hub Assembly With Adjustable Spring-Loaded Spindle
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Solution Overview
Problem
Existing door handle assemblies are typically designed for specific door thicknesses, failing to accommodate doors with varying thicknesses effectively.
Innovation Solution
A hub assembly for a door handle featuring a spindle with a spring mechanism and elongated slots, allowing for adjustable positioning and secure attachment to doors of varying thicknesses through a spindle slideably received within a spindle recess and retained by a retention pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If door handle assemblies are designed for specific door thicknesses, then the attachment is secure and stable, but the adaptability to doors with varying thicknesses is poor
Solution Approach 1:
The spindle is designed to be slideable within the hub body rather than fixed, allowing dynamic adjustment of the spindle's position along the longitudinal axis. This enables the door handle assembly to adapt to different door thicknesses while maintaining secure attachment through the spring-loaded retention mechanism that holds the spindle in place once positioned.
Solution Approach 2:
The spring mechanism changes the retention parameter by providing adjustable retention force. The spring can be compressed or extended to accommodate different spindle positions corresponding to different door thicknesses, while still maintaining sufficient retention force to secure the spindle in place. This allows the same assembly to reliably attach to doors of varying thicknesses.
2Ease of operation
If a fixed spindle position is used in the hub body, then the manufacturing precision is high, but the ease of operation for adjustment is poor
Solution Approach 1:
The hub body is segmented with an elongated slot instead of a single fixed position for the spindle. This segmentation allows the spindle to be positioned at different locations along the slot while still being retained securely. The retention pin and spring mechanism work together to hold the spindle at its selected position, combining ease of adjustment with adequate positioning precision.
Solution Approach 2:
The spring acts as an intermediary between the spindle and the hub body, providing a controlled retention force that allows easy insertion and adjustment of the spindle while maintaining precise positioning once in place. The spring's elastic property enables smooth operation during assembly and disassembly while ensuring accurate retention at the desired position.
3Adaptability or versatility
If the spindle is made fixed and non-adjustable, then the device complexity is low, but the adaptability to different door configurations is poor
Solution Approach 1:
The hub assembly is designed with multi-functionality to serve both fixed and adjustable roles. The spring-loaded retention mechanism with elongated slot provides universal adaptability to work with doors of various thicknesses and configurations, while the overall hub body structure maintains simplicity. This allows a single design to handle multiple door types without requiring complex adjustment mechanisms.
Solution Approach 2:
The spring mechanism is self-regulating, automatically providing the appropriate retention force regardless of the spindle's position along the elongated slot. This self-service feature eliminates the need for complex external adjustment mechanisms or multiple components, achieving adaptability through a simple, elegant self-contained system that adjusts itself based on the door thickness.
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 secure and adjustable attachment of door handles to doors of varying thicknesses, facilitating easy assembly and disassembly, and ensuring proper alignment and functionality.
Implementation Method 1
A spring at least partially located within the spindle recess on the hub body and in engagement with the spindle
Implementation Method 2
The spindle is biased towards an extended position relative to the hub body with a spring located within the spindle recess
Data Source
AI summary
A hub assembly for a door handle includes a hub body that extends along a longitudinal axis and has a first end portion including a spindle recess and a second end portion including a handle attachment protrusion. A spindle slideably received within the spindle recess in the first end of the hub body. A spring at least partially located within the spindle recess on the hub body and in engagement with the spindle.