Garage Door Roller Shaft Plastic Coating for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Garage door rollers create significant noise due to metal-to-metal contact between the steel roller shaft and the hinge tube as the garage door is raised and lowered, with existing solutions like lubrication and plastic hinge barrels failing to adequately address the issue.
Innovation Solution
A thermoplastic injection molded cover is applied to the metal roller shaft, providing a cushioning effect and eliminating metal-to-metal contact, while also using urethane injection into the gap between wheel sections to create a tire-like effect, reducing noise and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel roller shaft is used to provide strength and durability, then the structural integrity is improved, but noise and rattling increase due to metal-to-metal contact
Solution Approach 1:
A plastic tube is introduced as an intermediary component between the steel roller shaft and the steel hinge tube. This plastic intermediary eliminates direct metal-to-metal contact, thereby reducing noise and rattling while the shaft remains strength-bearing. The plastic tube acts as a mediator that preserves the functional relationship between moving parts while eliminating harmful acoustic effects.
Solution Approach 2:
The solution combines two different materials - steel for the roller shaft (providing strength) and plastic for the noise-reducing tube (providing cushioning). This composite approach allows each material to perform its optimal function: the steel shaft maintains structural integrity while the plastic tube eliminates metal-to-metal contact noise.
2Ease of operation
If lubricant is applied between the shaft and tube to reduce friction, then ease of operation is improved, but noise reduction is insufficient
Solution Approach 1:
The invention replaces the lubrication-based friction reduction approach with a mechanical substitution - using a plastic tube that inherently provides both low-friction movement and noise reduction. Instead of relying on lubricant films that fail to eliminate metal-to-metal contact sounds, the plastic tube physically prevents direct contact between metal surfaces, simultaneously achieving smooth operation and quiet performance.
3Object-generated harmful factors
If a plastic hinge barrel is used to reduce noise, then noise is reduced, but strength is sacrificed and the assembly appears weak
Solution Approach 1:
Instead of making the entire hinge barrel plastic (which would compromise overall strength), the invention applies local quality by using a plastic tube only in the specific region where noise reduction is needed - between the roller shaft and the hinge tube. The rest of the hinge assembly can remain steel, maintaining overall structural strength while locally eliminating noise at the contact interface.
4Ease of operation
If the gap between the roller shaft and hinge tube is increased to allow free movement, then ease of operation is improved, but rattling noise increases
Solution Approach 1:
The plastic tube serves as an intermediary that fills the gap between the roller shaft and hinge tube. This intermediary allows the shaft to move freely side-to-side (maintaining ease of operation) while the plastic material absorbs movement variations and prevents the hollow-sounding rattles that occur with larger metal-to-metal gaps.
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 noise and rattling, providing a long-lasting, cost-effective, and chemical-resistant solution that works with existing garage door systems, ensuring a quieter operation and improved durability.
Implementation Method 1
A thermoplastic injection molded cover is applied to the metal roller shaft, providing a cushioning effect and eliminating metal-to-metal contact
Implementation Method 2
using urethane injection into the gap between wheel sections to create a tire-like effect, reducing noise and enhancing durability
Data Source
AI summary
A roller with a plastic injection tube to coat the steel shaft wherein the plastic coated shaft eliminates the metal-to-metal contact that creates the noise. Further disclosed is an improved roller wheel having a tire made of material selected from the group consisting of urethane and urethane (PER) on which the roller will roll within a garage door track to significantly reduce the noise of the roller as it rolls inside the garage door tracks as the garage door is raised and lowered. The roller shaft has the treads extending to a distal end of the roller shaft where a plastic washer and a closing cover nut with interior threads are threaded onto the distal end of the roller shaft. The closing cover nut with interior threads is selected from an acorn nut with a nylon insert and a hex lock nut with a nylon insert.