Flush Lever Handle Mounting with Floating Depth Adjustment
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Solution Overview
Problem
Existing door leaf designs with flush-mounted lever handles face challenges in design flexibility, complexity in manufacturing, and difficulty in adjusting depth due to the need for special fittings and grooves, limiting the use of standard lever handles and requiring complex assembly processes.
Innovation Solution
A method and structure for mounting a lever handle set on a door leaf using a substructure with a cylindrical through-opening for detachable insertion and rotatable bearing, supported by the door leaf body, and covered by a flush-mounted cover, allowing for standard lever handles and easy depth adjustment without grooves, and utilizing hot-melt adhesive for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a special door fitting with a groove is used to allow the lever handle to rotate freely, then the lever handle can rotate freely on the rosette disc, but only special door fittings can be used and manufacturing becomes complex
Solution Approach 1:
The groove that was previously integrated into the door fitting is extracted and transferred to the rosette disc. The rosette disc now carries the groove that engages with the lever handle neck, while the door fitting itself becomes a simpler cylindrical substructure without the groove feature. This extraction of the groove feature from the door fitting to the rosette disc resolves the contradiction by maintaining free rotation capability while simplifying the door fitting structure.
Solution Approach 2:
The rosette disc serves as an intermediary element between the door fitting and the lever handle. It provides the groove engagement feature that enables free rotation, while the door fitting itself remains a simple cylindrical structure. This intermediary component allows standard lever handles to be used without requiring complex integrated door fittings.
2Ease of operation
If the lever handle neck has a groove that engages an inner edge of the disc, then the lever handle can rotate freely, but subsequent depth adjustment is not possible
Solution Approach 1:
The system is segmented into three independent components: the door fitting (substructure), the rosette disc, and the lever handle. The groove is placed on the rosette disc rather than the door fitting, allowing the rosette disc to be positioned at different depths relative to the door surface. This segmentation enables both free rotation (via the groove engagement) and depth adjustment (by repositioning the rosette disc) to occur simultaneously.
3Ease of manufacture
If a continuous milled lever handle recess is provided, then standard door handles can be used, but gaps between the door handles and the substructure require spacers
Solution Approach 1:
The substructure is designed with an integrated support surface that directly supports the lever handle set, eliminating the need for separate spacers. The support surface is formed as part of the substructure itself, allowing the lever handle set to be mounted directly without requiring additional gap-compensating components. This self-service approach reduces assembly complexity while maintaining the ability to accommodate varying door thicknesses.
4Adaptability or versatility
If different spacers are provided to accommodate varying door thicknesses, then door handles can be mounted on doors of different thicknesses, but the assembly process becomes more complex
Solution Approach 1:
The substructure is designed with a floating mounting capability that allows it to adapt dynamically to different door thicknesses. Rather than requiring fixed-position spacers for each thickness variation, the substructure can be positioned at different depths and fixed in place, providing continuous adaptability. This dynamic approach replaces the discrete spacer system with a more flexible, thickness-independent mounting method.
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 the use of standard lever handles with simplified assembly, accommodates manufacturing tolerances, and maintains a high-quality appearance by allowing for easy depth adjustment and compatibility with various door thicknesses, while supporting the lever handle set without relying on the lock for support.
Implementation Method 1
fixation with hot-melt adhesive
Data Source
Figure 1~3
Figure 2
Figure 4
AI summary
Various versions of a door leaf (10) with a flush-mounted door fitting (16) for the pivot bearing of a lever handle set (14) are described. The door fitting (16) has a substructure (32) for the pivot bearing of a lever handle end that is simply inserted (and not secured at the end). The substructure (32) is supported by a support area (52) directly on a step (60) of the door leaf body (54), so that its position is not affected by misalignments of the lock (30).