Elastic Roller Guide for Sliding Door Noise and Friction
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Solution Overview
Problem
Sliding doors guided by a pin at the bottom edge can experience increased friction and generate annoying rumbling noises due to repeated impacts on the flanks of the guide groove, which existing solutions fail to adequately address.
Innovation Solution
A radially elastic roller mounted on a vertical axis, designed to absorb forces and dampen impacts without impeding the sliding door's movement, is used to guide the lower edge of the sliding door, featuring a soft material or a hard central part with an elastic coating to cushion radial forces and prevent noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pin is guided in a groove with a relatively large amount of play to avoid additional friction, then friction is reduced, but rumbling noises arise due to repeated impacts on the flanks of the groove
Solution Approach 1:
The patent changes the physical parameters of the guide pin by coating it with a soft material (rubber, plastic, or foam rubber). This material change allows the pin to deform elastically during operation, absorbing impact energies that would otherwise cause noise, while maintaining low friction through the smooth surface of the coating.
Solution Approach 2:
The guide pin is constructed as a composite structure with a hard core (steel or aluminum) providing structural strength and a soft outer coating (rubber, plastic, or foam rubber) providing noise-damping and low-friction properties. This composite design combines the advantages of both hard and soft materials to resolve the contradiction between friction reduction and noise prevention.
2Object-generated harmful factors
If a tension spring presses rollers against the flanks of the guide groove to prevent impacts, then noise is reduced, but the sliding door becomes more difficult to move due to increased friction
Solution Approach 1:
The patent replaces the complex, active tension spring mechanism with a simple, passive soft-coated pin. The soft coating material acts as a one-time, non-recoverable element that permanently deforms to absorb impacts, eliminating the need for springs while maintaining noise reduction and reducing friction.
3Object-generated harmful factors
If the pin is guided in the groove with precise fitting to eliminate play, then noise from impacts is reduced, but additional friction increases making the door harder to slide
Solution Approach 1:
The patent changes the surface properties of the guide pin by applying a soft coating, which allows for slight dimensional variations and play in the groove without causing impact noises. The soft material deforms to fill gaps and absorb impacts, enabling a clearance fit that reduces friction while preventing noise.
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 effectively reduces friction and eliminates noise associated with the sliding door's interaction with the guide device, ensuring smooth operation and silent performance.
Implementation Method 1
The roller (7) is made of an elastic material such as foam rubber, rubber or a soft plastic... the elasticity of the central part or the cover means that the roller (7) is radially elastic and forces that act radially on the roller (7) are cushioned
Data Source
Figure 1~4
AI summary
The device (1) has a guide element arranged on a floor below a sliding door and engaging into a groove at a lower edge of the door. A roller (7) is rotatably mounted at the guide element on a vertical axle (5). A radius of the roller is resiliently changed based on radial forces. The roller is made of elastic material. Fixed guide jaws (13) are arrange lateral to the roller such that a periphery of the roller overlaps the jaws in a right angle to a moving direction of the door. A diameter of the roller is smaller than a width of the groove.