Operating Handle Radial Spring Mechanism Eliminates Rotational Play
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Solution Overview
Problem
Existing operating handle designs face issues with rotational play, high manufacturing costs, complex assembly, and aesthetic concerns due to protruding screws, while also requiring tools for installation and not easily adapting to varying door or window thicknesses.
Innovation Solution
A device with a radially acting spring between the handle and driver element, featuring a contact section connected to the driver element and legs resting on an undercut, eliminates rotational play by introducing a radial force, allowing tool-free assembly and adaptation to different thicknesses without radial play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-part square pin with expansion screw is used to eliminate radial play, then radial play between driver element and handle is eliminated, but manufacturing cost increases due to requiring right and left halves, assembly becomes complex and requires tools, and aesthetic appearance deteriorates when screw protrudes from handle
Solution Approach 1:
The connection device is divided into a handle part and a driver element part that can be separately manufactured and assembled. The spring element is a separate component that can be inserted into the handle part, allowing the handle to be pre-assembled with the spring mechanism before final installation onto the driver element.
Solution Approach 2:
The spring element automatically eliminates radial play between the driver element and handle through its elastic radial force, without requiring additional adjustment or tool-assisted assembly. The design self-adjusts to different door thicknesses through the adjustable stop mechanism.
2Reliability
If a device with radially acting spring is used to eliminate radial play, then radial play is eliminated and assembly becomes tool-free, but manufacturing precision requirements increase to ensure proper spring positioning and force
Solution Approach 1:
The spring element is pre-installed into the handle part during handle manufacturing, allowing its position and preload to be optimized beforehand. The handle is then delivered to the customer as a complete unit with the spring mechanism already integrated, reducing on-site assembly complexity.
Solution Approach 2:
The spring element's radial force can be adjusted by changing its preload, material properties, or geometric parameters during handle manufacturing. The adjustable stop mechanism allows the effective length and thus the spring force to be varied to compensate for manufacturing tolerances in the spring element itself.
3Adaptability or versatility
If the handle is designed to adapt to different door thicknesses, then adaptability to varying thicknesses is improved, but the connection stability may deteriorate if the connection mechanism is too loose
Solution Approach 1:
The connection device allows the handle to be positioned at different axial locations along the driver element to accommodate different door thicknesses. The adjustable stop mechanism enables dynamic adjustment of the connection length while maintaining a stable, tool-free insertion process. The spring element continuously applies radial force to eliminate play regardless of the specific connection length.
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
The solution provides a cost-effective, tool-free assembly with a stable, play-free connection that adapts to various thicknesses, ensuring secure torque transmission and preventing rotational play, while being easy to manufacture and aesthetically pleasing.
Implementation Method 1
a spring (12) acting radially to the driver element (2) is arranged between the driver element (2) and the device (1)
Data Source
Figure 1~3
Figure 4~5
AI summary
The handle has a handgrip, and a driver element (2) that is rotatably engageable with the handgrip. A cartridge type device (1) is arranged between the handgrip and the driver element, where the cartridge type device is formed such that insertion of the driver element is effected in one direction, and the driver element is locked in another direction. A spring (12) acts radially to the driver element, where the spring is arranged between the driver element and the cartridge type device. The spring is held parallel to an axial direction.