Door Handle Mounting Device Elastic Threshold Mechanism
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Solution Overview
Problem
Large doors, especially those in high-traffic areas like department stores, experience premature failure of handles due to excessive tensile forces caused by wear and vibration, leading to loosening and dislocation of fixings, which is exacerbated by the long lever arm of stick-type handles.
Innovation Solution
A door handle with a mounting device featuring an elastic member that allows relative movement between the handle tube and spacers above a threshold tensile force, providing a mechanical circuit breaker effect to absorb excess force and prevent loosening, while maintaining aesthetics and lightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the handle tube is rigidly fixed to the spacers, then the handle maintains structural integrity and rigidity, but the mounting device loosens rapidly under excessive tensile forces
Solution Approach 1:
The mounting device transitions from a static rigid connection to a dynamic system that adapts to loading conditions. The elastic member allows the mounting device to deform elastically under excessive tensile forces, absorbing energy and preventing permanent damage to the fixings while maintaining structural integrity during normal operation.
Solution Approach 2:
The elastic member is pre-installed in the mounting device to provide beforehand cushioning against excessive tensile forces. This elastic element acts as a protective mechanism that engages before damage occurs, absorbing shock loads and preventing the rapid loosening that would otherwise occur with rigid固定.
2Weight of stationary object
If the handle tube is made hollow for aesthetics and lightness, then the door remains lightweight and visually appealing, but the handle cannot accommodate locking mechanisms and has reduced mechanical strength
Solution Approach 1:
The patent changes the mechanical parameters of the mounting device by introducing an elastic member with specific stiffness characteristics. This allows the hollow tube to maintain its weight and aesthetic advantages while the elastic mounting device compensates for the reduced structural strength, providing the necessary mechanical performance through controlled elasticity.
3Length of stationary object
If the handle tube length is increased for aesthetic purposes and door rigidity, then the door panel rigidity is improved, but the lever arm increases and amplifies tensile forces on the fixings
Solution Approach 1:
The elastic member in the mounting device provides beforehand cushioning against the amplified tensile forces resulting from the long lever arm. By positioning this elastic element at the mounting interface, it absorbs the excessive forces before they can damage the fixings, enabling the use of long handle tubes without compromising the durability of the mounting system.
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 significantly reduces the rapid loosening and deterioration of handles, extending their lifespan and ensuring long-lasting comfort, while preserving aesthetics and reducing weight, allowing the handle to accommodate increased tensile forces without damaging the assembly devices.
Implementation Method 1
the mounting device comprises an elastic member configured such that, below a threshold tensile force exerted on the mounting device, the tube is rigidly fixed on the spacer in question and that, above above said threshold tensile force, relative movement is permitted between the tube and said spacer
Data Source
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AI summary
Door handle, of the stick handle type, allowing better resistance to significant tensile forces, comprising a tube (4) forming a gripping means, and at least two fixing spacers (5) each mounted on the tube (4) by means of a mounting device (20) and configured to be mounted on a door panel (2); the mounting device (20) comprises an elastic element (21) configured such that, below a threshold tensile force exerted on the mounting device (20), the tube (4) is rigidly fixed on the spacer (5) considered and that, above said threshold tensile force, a relative movement is permitted between the tube (4) and said spacer (5).