Door Handle Fitting with Integrated Axial Stop
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Solution Overview
Problem
Existing door fittings require additional components like grub screws that are prone to water or dirt ingress, and an extra bearing for rotatable handle mounting, complicating assembly and increasing component count.
Innovation Solution
A door fitting design where the handle is secured by a stop element that abuts a stop on the fitting body, eliminating the need for grub screws and allowing for simple assembly with fewer components, using connecting elements for axial and rotational fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a grub screw is used to secure the handle against axial displacement, then the handle is firmly fixed, but additional components are required and water or dirt can ingress
Solution Approach 1:
The patent combines the handle fixation function with the bearing element itself. The bearing element is designed with an integrated fixation mechanism where the handle can be inserted and fixed axially without requiring a separate grub screw. This merging of functions reduces component count while maintaining secure fixation.
Solution Approach 2:
The bearing element serves multiple functions: it provides rotational support for the handle and simultaneously acts as the fixation mechanism. The bearing element is designed to receive the handle and prevent axial displacement through its structural design, eliminating the need for dedicated fastening components.
2Ease of operation
If a separate bearing is used for rotatable handle mounting, then the handle can rotate smoothly, but the component count increases
Solution Approach 1:
The patent merges the bearing function with the fixation element. The same component that secures the handle against axial displacement also provides the rotational bearing surface. This is achieved by designing the fixation element with appropriate geometric features that enable both securing and rotatable mounting functions.
3Reliability
If multiple components are used for handle assembly, then secure mounting is achieved, but assembly becomes more complex
Solution Approach 1:
The patent combines multiple functions into a single integrated component - the fixation element that simultaneously provides axial securing and rotational bearing capabilities. This reduces the number of assembly steps while maintaining reliable mounting through the multi-functional design of the bearing element.
Data Source
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AI summary
The invention relates to fitting (1) for a building door, comprising a handle (30), in particular a door handle, and a bearing element (11) for mounting the handle (30). According to the invention, the handle (30) has at least one first connecting element (39) and the bearing element (11) has at least one second connecting element (18), wherein the connecting elements (18, 39) are designed such that in operating positions (I, II) of the handle (30) the handle (30) is held on the bearing element (11) in a manner that prevents it from being pulled off and rotated, and in a mounting position (III) of the handle (30) the handle (30) is axially movable on the bearing element (11).