Silent Door Stop Catch with Tapered Elastomeric Member
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Solution Overview
Problem
Conventional door stops and catches are loud and can cause rebound issues, and existing magnetic catches are expensive and difficult to obtain, leading to potential injuries and further collisions.
Innovation Solution
A door stop and catch system featuring a resilient member with a varying inner diameter and tapering design, allowing for frictional coupling and sound absorption, which can be attached to either the door or wall, using materials like elastomers to reduce noise and maintain the door open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal rod door stops are used, then the door stop function is achieved, but loud collision noise is generated
Solution Approach 1:
A resilient member made of elastomeric material is introduced as an intermediary between the door stop and the catch. This resilient member deforms during engagement, absorbing impact energy and reducing collision noise while maintaining the door stop function. The resilient member acts as a mediator that converts the harmful mechanical impact into elastic deformation.
Solution Approach 2:
The door stop system combines a rigid door stop body with a resilient elastomeric member. This composite structure integrates the structural support function of the rigid component with the shock-absorbing and noise-reducing properties of the elastomeric material, achieving both reliability and noise reduction.
2Reliability
If conventional door stops with baseboard collision are used, then the door stop function is achieved, but door rebound occurs causing injury and repeated collisions
Solution Approach 1:
The resilient member serves as a mediator that provides a compliant engagement surface between the door stop and catch. This compliance prevents the rigid collision that causes door rebound, while the frictional coupling mechanism maintains the door in the desired position without violent recoil.
Solution Approach 2:
The resilient member is positioned in advance to cushion the engagement between the door stop and catch. By deforming before the door comes to a complete stop, it absorbs the impact energy and prevents the rebound effect that would otherwise occur with rigid components.
3Object-affected harmful factors
If magnetic catches are used to prevent rebound, then the door position is maintained, but the system becomes expensive and difficult to obtain
Solution Approach 1:
The patent replaces the magnetic field-based holding mechanism with a purely mechanical frictional coupling system. The resilient member's deformation and friction against the door stop provide the holding force, eliminating the need for rare-earth magnets and complex magnetic assemblies, thereby reducing cost and improving manufacturability.
Solution Approach 2:
The system uses changes in the resilient member's physical state (elastic deformation) and friction parameters to achieve door position maintenance. By adjusting the elastomeric material properties and geometric parameters of the resilient member, the frictional holding force can be optimized to prevent rebound without requiring expensive magnetic materials.
4Ease of operation
If magnetic catches are used to maintain door position, then the door remains open, but increased momentum causes louder collisions
Solution Approach 1:
The resilient member acts as a mediator that reduces the momentum transfer during door closure. By deforming elastically, it extends the engagement time and reduces the peak force, thereby reducing collision noise while still maintaining the door position through frictional coupling.
Solution Approach 2:
The resilient member is positioned to cushion the impact before the door stop fully engages with the catch. This pre-cushioning reduces the momentum buildup that would otherwise occur with magnetic attraction, resulting in quieter operation while maintaining door position stability.
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 reduces noise and prevents rebound by using a frictional coupling mechanism that absorbs force, maintaining the door open while being easy to set up and durable over time.
Implementation Method 1
a resilient member... configured to rotate relative to the elongated member about the central axis... The resilient member defines an inner diameter that is larger at the second end of the resilient member than at the first end of the resilient member
Implementation Method 2
The inner diameter is configured to receive the door stop... coupling, via a frictional coupling, the door stop with the inner diameter of the resilient member to maintain the door in an open position
Data Source
AI summary
One example of the present disclosure includes a system having a catch configured to attach to a door or a wall. The catch can include a base, an elongated member extending outwardly from the base and defining a chamber therein, and a resilient member having (i) a first end positioned in the chamber and (ii) a second end. The resilient member can define an inner diameter that is larger at the second end of the resilient member than at the first end of the resilient member. The system can also include a door stop configured to couple to the other of the door or the wall. The door stop can include an end member extending therefrom and being receivable within the inner diameter of the resilient member of the base.