Door Restraint Assembly with Integrated Limiting Unit

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional door restraint devices fail to prevent doors from striking adjacent walls when opened, potentially causing damage.

Innovation Solution

A hinge unit with a limiting unit that restricts the door's rotation, comprising a spindle, biasing member, and stop mechanism, which inhibits the door from fully opening and thus prevents it from hitting the wall by using a sleeve that travels along a slot and engages with a stop to limit motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional hinge unit is used, then the door can open freely, but the door may strike the adjacent wall causing damage

Engineering Contradiction:

Improvedoor opening freedomVSAvoidwall damage from door impact

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The limiting unit is pre-configured with a stop mechanism that applies counter-action before the door can strike the wall. The stop engages with the sleeve at a predetermined position, preventing the door from opening beyond the safe angle and thus preemptively avoiding wall damage

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The limiting unit acts as an intermediary mechanism between the door and wall. It includes a sleeve that travels along a slot and engages with a stop to mediate the door's motion, allowing controlled opening while preventing excessive rotation that would cause wall impact

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a limiting unit is added to restrict door rotation, then wall damage is prevented, but the device complexity increases

Engineering Contradiction:

Improvewall damage preventionVSAvoidhinge unit structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The limiting unit is merged with the hinge unit as an integrated assembly. The sleeve is positioned within the hinge unit's tube, and the stop mechanism is incorporated into the same structure, combining the hinge function with the limiting function in a single unified device rather than separate components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The hinge unit is designed with multi-functionality, serving both as the rotational joint for the door and as the limiting mechanism. The tube, sleeve, and stop components perform dual roles: facilitating door rotation while simultaneously restricting it to prevent wall contact, eliminating the need for separate limiting devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively prevents door damage to adjacent walls by restricting the door's opening motion, ensuring the door does not strike the wall, thereby protecting the wall from potential damage.

Implementation Method 1

a biasing member positioned within the tube and engaged to the spindle. The biasing member urges the spindle, and thus the sleeve, along the slot

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10753132B2Door restraint assembly

Publication Date: 2020.08.25 ROBERTS BROCK

AI summary

A door restraint assembly for inhibiting a door from striking a wall when the door is opened includes a hinge unit that is hingedly coupled between a door and a door frame. A limiting unit is rotatably positioned in the hinge unit. The limiting unit limits rotation of the hinge unit when the door is opened. In this way the limiting unit inhibits the door from striking an adjacent wall when the door is opened.