Door Fitting Holding Spring Assembly Mechanism
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Solution Overview
Problem
Existing door or window fittings have complex structures requiring special tools for assembly and disassembly, and involve moving parts that can be cumbersome.
Innovation Solution
A simplified door or window fitting design featuring a holding spring that pretensions the handle relative to a bearing disc, allowing for quick assembly and disassembly without special tools, and a bayonet-like locking mechanism that secures the bearing disc to the mounting base using the spring's prestressing force, eliminating the need for additional securing means between the handle and square pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mounting structure with multiple plates and bayonet locking mechanisms is used, then the fitting achieves secure mounting, but the assembly and disassembly require special tools and become time-consuming
Solution Approach 1:
The mounting base is divided into two separable plates that can be independently screwed to the door leaf or window frame, allowing the handle to be mounted separately without removing the entire mounting base. This segmentation enables quick assembly and disassembly while maintaining secure mounting through the two-plate structure.
Solution Approach 2:
The locking mechanism is extracted from the traditional screw-based system and replaced with a bayonet-type locking mechanism on the bearing bush, which provides secure locking through a simple rotational motion that can be performed without special tools, significantly reducing assembly time while maintaining reliability.
2Reliability
If a rotatable locking element with bayonet-like projections is used, then the handle can be securely fixed to the mounting base, but the structure becomes more complicated and requires special tools for operation
Solution Approach 1:
The locking element is merged with the handle shaft, and the bayonet-like projections are integrated directly into the mounting base structure. This combination simplifies the overall structure by eliminating separate locking components while maintaining secure handle fixation through the rotational locking action.
3Ease of manufacture
If the cover cap is pushed axially onto the handle neck and clipped into the mounting base, then the mounting base is covered, but the cap requires elastic material and precise axial movement
Solution Approach 1:
The cover cap is nested within the mounting base structure, with the cap's outer peripheral area receiving radial projections from the mounting base. This nesting arrangement allows the cap to be simply pushed axially into place without requiring elastic materials or complex clipping mechanisms, simplifying both manufacturing and installation.
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 and quick assembly and disassembly of the fitting, with the cover cap forming a non-displaceable unit with the bearing disc, preventing undesired rotation and eliminating the need for separate securing tools or Allen screws.
Implementation Method 1
there is a holding spring which interacts with the bearing section on the one hand and with the bearing disc on the other hand and by means of which the handle is pretensioned relative to the bearing disc in a predetermined rotational starting position
Implementation Method 2
the bearing disk being pushed from an unlocked rotational position into a locked rotational position by the prestressing force of the spring holding it up
Data Source
Figure 1
Figure 2~4
Figure 5a~7b
AI summary
The door- or window fitting has a handle (1) and a rosette (2) which has a mounting base (14) fastened at a door leaf or at a window frame and a bearing disk (29) axially fixed on a bearing section (4) of the handle for rotatable mounting of the handle and a covering cap (28). A holding spring (12) is provided within the area of the bearing section. The holding spring is coactive with the bearing section in one side and with the bearing disk in another side. The bearing disk is pressed from an unlocked rotational position into a locked rotational position by the pre-load of the holding spring.