Door Handle Bayonet Fitting for Low-Force Spring Assembly
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Solution Overview
Problem
Existing door handle sets require high installation effort due to the need to overcome the strong return force of the spring during assembly, leading to installer fatigue when installing multiple sets.
Innovation Solution
The bayonet fitting function is separated from the spring preload function, allowing the cover cap to be rotated independently of the spring force, reducing the need for manual force application during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring is used to provide strong return force for secure mounting, then the reliability of the door handle assembly is improved, but the installation effort and time required increase significantly
Solution Approach 1:
The patent divides the mounting process into two independent phases: first, the cover cap is rotated to open the bayonet fitting and align components; second, the door handle is pressed onto the spindle to secure mounting. This segmentation allows the spring to act only during the second phase without interfering with the first phase, reducing installation effort while maintaining secure mounting.
Solution Approach 2:
The bayonet fitting is designed to automatically align the door handle components with the spindle before the final pressing action. The cover cap rotation pre-opens the bayonet fitting, ensuring that when the door handle is pressed onto the spindle, the components are already positioned correctly, eliminating the need to overcome spring force during alignment.
2Reliability
If the bayonet fitting requires rotation against spring force for alignment, then the connection security is improved, but the installation time and labor increase
Solution Approach 1:
The patent separates the alignment function (bayonet fitting rotation) from the securing function (pressing onto spindle). The cover cap can be rotated independently to open the bayonet fitting without engaging the spring force, and only after alignment is achieved does the pressing action engage the spring for secure mounting. This eliminates the need to rotate against spring force during alignment.
Solution Approach 2:
The cover cap acts as an intermediary element that mediates between the bayonet fitting and the spring. By rotating the cover cap first, the bayonet fitting is opened and components are aligned before the spring is engaged during the pressing phase. This intermediary action allows alignment without overcoming spring force.
3Volume of moving object
If the cover cap is small providing short lever arm for rotation, then the device compactness is improved, but the torque required for installation increases
Solution Approach 1:
The patent separates the rotation operation (cover cap) from the pressing operation (door handle). The cover cap rotation opens the bayonet fitting without requiring torque against spring force. The door handle pressing operation engages the spring for secure mounting. This segmentation eliminates the need to generate torque during the rotation phase, compensating for the short lever arm of the small cover cap.
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 enables easy and rapid assembly of door handle sets with minimal effort, preventing installer fatigue and ensuring secure mounting without unintentional disassembly.
Implementation Method 1
a spring (10) which, with respect to the pivot axis (8) in the circumferential direction (13), is supported on one hand by the door handle (4) and on the other hand by the positioning plate (9), and which, in particular in the case of a mounted door handle set (1), biases the door handle (4) in the circumferential direction (13) into the unactuated starting position
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a door handle set (2) for a door handle set (1) for operating a door lock (49) of a door (48), comprising a door handle (4) which has a polygonal receptacle (12) for receiving a polygonal spindle (7) coaxially to a pivot axis (8) of the door handle (2), a cover cap (6) and a positioning plate (9) which are rotatably and axially fixedly arranged on the door handle (4) with respect to the pivot axis (8), a spring (10) which is supported on the one hand on the door handle (4) and on the other hand on the positioning plate (9) with respect to the pivot axis (8) in a circumferential direction (13) and which biases the door handle (4) in the circumferential direction (13) into an unactuated initial position, a stop ring (11) which is rotationally fixed to the door handle (4) with respect to the pivot axis (8) and which has a first stop (14) defining the initial position, and a Mounting plate (5),which can be fixed to the door in a rotationally fixed and axially fixed manner with respect to the pivot axis (8). Rapid assembly with minimal effort can be achieved if the cover cap (6) is fixed axially fixed to the mounting plate (3) with respect to the pivot axis (8) by means of a bayonet fitting (17), and the positioning plate (9) is fixed to the mounting plate (5) in a rotationally fixed manner with respect to the pivot axis (8).