Door Hinge Pin Motion Control Using Shear Thickening Fluid
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Solution Overview
Problem
The problem of door slamming causes potential harm, damage, and noise, and existing technologies lack effective solutions to control motion and prevent such incidents, especially in industrial settings where uncontrolled motion can lead to equipment damage and safety hazards.
Innovation Solution
The use of Shear Thickening Fluid (STF) in a system that includes a chamber, piston, and shim configuration, allowing the door to close normally under light pressure while stiffening to control and dampen motion under greater pressure or speed, thereby preventing slamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door is allowed to close freely without resistance, then the ease of operation is improved, but the door may slam causing damage, harm, and noise
Solution Approach 1:
The patent utilizes a shear thickening fluid whose viscosity parameter changes dynamically based on shear rate. During normal door closure, the fluid maintains low viscosity allowing easy operation. When slamming occurs and shear rate increases, the fluid viscosity increases dramatically to prevent damage and reduce noise
Solution Approach 2:
The system transitions from a static resistance mechanism to a dynamic one using shear thickening fluid. The fluid's resistance特性 changes in real-time based on the door's motion characteristics, providing low resistance during controlled closure and high resistance during slamming events
2Object-affected harmful factors
If a door closer mechanism is installed to control closing speed, then the slamming is prevented, but the device complexity increases
Solution Approach 1:
The shear thickening fluid automatically adjusts its resistance based on the door's motion without requiring external control mechanisms. The fluid self-regulates by detecting shear rate changes, eliminating the need for motors, sensors, or complex mechanical linkages that would increase device complexity
Solution Approach 2:
The patent replaces traditional mechanical door closer systems with a fluid-based passive control mechanism. Instead of using motors, springs, or hydraulic systems, the invention uses the inherent rheological properties of shear thickening fluid to achieve door motion control
3Object-affected harmful factors
If a dampening mechanism is added to reduce slamming, then the harmful effects are reduced, but the ease of operation deteriorates
Solution Approach 1:
The shear thickening fluid's viscosity parameter changes dramatically with shear rate. During normal closure with low shear rate, the fluid maintains low viscosity for easy operation. During slamming with high shear rate, the viscosity increases to dampen the impact and reduce harmful effects
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 system effectively prevents door slamming by adjusting resistance levels, ensuring safe and controlled motion, reducing the risk of damage and noise, and providing a versatile solution for industrial applications.
Implementation Method 1
STF is relaxed at rest and behaves nearly like most viscous liquids under minimal shear or pressure (e.g., flowable, pourable, etc.). Under normal closing conditions, the fluid remains relaxed and the door closes easily. When pressure or shear forces are applied, the fluid stiffens instantaneously
Data Source
AI summary
Systems and devices to control linear, rotational, and/or arcuate motion are provided herein. In some examples, a pin system is configured for insertion in a door and/or door jamb, and to control motion of the door, such as a speed with which the door closes. In some examples, a hinge pin is configured to replace a conventional hinge pin and to control motion of the door. In some examples, a hinge system is configured to replace a conventional door hinge and to control motion of the door.