Door Handle Fitting With Separable Bearing Core
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Solution Overview
Problem
Existing door and window handle fittings face issues with wear and instability due to frictional stress, leading to a loss of effective axial fixing and creative design limitations, as well as difficulties in assembly and disassembly.
Innovation Solution
A fitting design featuring a bearing core interposed between the handle's bearing lug and the base, allowing the bearing attachment and core to rotate together, thus isolating the bearing from wear and enabling a precise, stable, and easily assembled connection with a latching element that separates axial locking from pivot bearing, using a roller bearing for low-friction operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door handle is rotatably mounted on the base with axial fixation by retaining rings, then the door handle is securely held on the door leaf, but the dismantling is very difficult requiring removal of the cover rosette or door panel
Solution Approach 1:
The fitting is divided into separable components: a bearing attachment that remains fixed in the base, and a bearing core that is press-fitted into the bearing attachment. This segmentation allows the bearing core to be easily removed while the bearing attachment remains securely mounted, solving the contradiction between secure mounting and ease of dismantling.
Solution Approach 2:
The bearing core is extracted as a separate, removable component from the bearing attachment. The bearing core can be pushed out axially without removing the cover rosette or door panel, while the bearing attachment remains securely fixed in the base, enabling easy maintenance while maintaining secure mounting.
2Reliability
If the locking element is resiliently prestressed in the circumferential groove, then the door handle arrangement is firmly fixed, but the locking element is exposed to considerable frictional stress leading to wear
Solution Approach 1:
The bearing core is extracted as a separate, removable component that carries the circumferential groove and locking element. This allows the locking element to be easily replaced when worn, while the bearing attachment with its bearing surface remains fixed in the base, solving the contradiction between firm fixation and service life.
Solution Approach 2:
The bearing core is designed as a disposable component that can be easily replaced when the locking element wears out. The valuable bearing attachment remains in place and is reused, allowing economical maintenance by replacing only the worn bearing core rather than the entire fitting.
3Ease of operation
If the bearing attachment and base rotate relative to each other during handle actuation, then the handle can be actuated, but wear occurs at the bearing point leading to loss of fit and instability
Solution Approach 1:
The bearing core is extracted as a separate component that rotates within the stationary bearing attachment. This separation allows the bearing surfaces to remain fixed relative to each other, eliminating wear at the bearing point while still enabling handle actuation through rotation of the bearing core.
Solution Approach 2:
The bearing core acts as an intermediary component that facilitates rotation between the handle and the base. It carries the circumferential groove and locking element, and its rotation within the stationary bearing attachment enables handle actuation without wear at the bearing interface.
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
This design significantly reduces wear, enhances stability and service life, simplifies assembly and disassembly, and allows for a reliable, secure handle attachment with reduced component complexity and design freedom, while minimizing material wear and cost.
Implementation Method 1
using a roller bearing for low-friction operation
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The fitting (201) has a handle (202) comprising a bearing attachment piece, a base (203) that is to be fixed at a carrier unit, and a bearing core piece (204). The core piece engages in the base and is supported pivotably in the base by a bearing (205). The attachment piece and the core piece are connected with each other such that a rotating movement is performed. A peripheral groove is formed at the attachment piece.