Door Handle Rotational Locking for Durable Door-Leaf Fixation
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Solution Overview
Problem
Existing door handle apparatuses suffer from high wear and tear, leading to detachment from the shaft element and interference with the lock mechanism, rendering them inoperative.
Innovation Solution
A door handle apparatus with a rotationally lockable arrangement using complementary fixing modules and rosettes, secured by a two-part fixing unit with base and adapter elements, and reinforced by threaded screws, ensuring robust fixation and operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If threaded bolts are used to fix handles to the shaft element, then the handles can be easily installed, but the connection suffers from high wear and tear leading to detachment
Solution Approach 1:
The fixing unit is divided into two separate parts: a base element that is permanently fixed to the door leaf, and an adapter element that connects to the shaft element. This segmentation allows each component to be optimized independently - the base element provides stable mounting while the adapter element handles the rotational connection, reducing wear on the critical interface between handle and shaft.
Solution Approach 2:
The adapter element acts as an intermediary component between the base element and the shaft element. It features a cylindrical portion that fits over the shaft element with external threading, providing a robust intermediate connection that reduces direct wear between the handle and shaft while maintaining ease of installation through threaded engagement.
2Ease of operation
If traditional fixing methods are used, then the installation process is simple, but the handle detaches due to wear and tear
Solution Approach 1:
The base element is pre-fixed to the door leaf before the adapter element is installed. This preliminary action establishes a stable foundation that prevents wear and tear on subsequent connections. The base element's permanent fixation to the door leaf ensures long-term durability while maintaining simple installation procedures.
Solution Approach 2:
The fixing unit combines different material properties in a composite structure: the base element is made of a material suitable for permanent door leaf fixation, while the adapter element uses threaded metal components for robust mechanical connection. This composite approach optimizes both installation simplicity and fixation longevity by assigning different material functions to each component.
3Reliability
If the handle is firmly fixed to prevent detachment, then reliability improves, but the installation process becomes more complex
Solution Approach 1:
The fixing unit is segmented into a base element and an adapter element, where the base element provides secure permanent fixation to the door leaf, and the adapter element handles the rotational connection to the shaft. This segmentation achieves reliable fixation without excessive complexity by dividing the fixing function into two specialized components.
Solution Approach 2:
The base element serves multiple functions: it provides permanent fixation to the door leaf, supports the adapter element, and maintains structural stability. The adapter element also serves multiple purposes by connecting to both the base element and the shaft element. This multi-functionality achieves reliable fixation while keeping the overall structure efficient and not overly complex.
Data Source
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Figure 2
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AI summary
It is disclosed a door handle apparatus (1) that comprises two handle modules, each being formed by a handle (2) and by a rosette (3), a shaft element (4) to connect the modules, and a fixing unit formed by two fixing modules (5) in order to provide fixation of the apparatus (1) to a door leaf, using fixing means (6). The particular set of features defining the fixing modules (511, 522) and the rosettes (31, 32), in particular its complementary configurations, allow to implement a rotationally lockable arrangement to achieve a fitting connection between both, that securely and reinforcedly fixes a handle module to a door leaf. Such apparatus (1) prevents natural wear and tear, resulting from continued use of the apparatus over time, from harming its functioning and the operability of the door's locking mechanism.