Automatic Door Stopping-Closing Device with Hook and Movable Lug

Solution Overview

Problem

Existing door closer technologies, including pneumatic and hydraulic systems, face issues such as 'bounce' during closing, physical contact with the closer rod, and limitations in maintaining the door open without external force, which affect user convenience and system durability.

Innovation Solution

An automatic door stopping-closing device with a connecting rod, bracket assembly, and reset forces to securely hold the door open and close it automatically with minimal user effort, utilizing a hook, movable lug, and pull rod mechanism that separates and reconnects to manage door position without biting into the closer rod.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If ordinary door closers are used to automatically close the door, then door closing convenience is improved, but the door cannot be held open without external force and repeated opening operations are required

Engineering Contradiction:

Improvedoor closing convenienceVSAvoidtime for repeated opening operations

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The door closer transitions from a static closing mechanism to a dynamic system with variable characteristics. The piston rod can be in different positions (retracted for closing, extended for holding open) and the damper characteristics can be adjusted between soft and hard based on the operational phase, enabling both automatic closing and hold-open functions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The door closer operates in periodic cycles: closing phase where the piston rod retracts and the door closes automatically, followed by a hold-open phase where the piston rod extends and maintains the door in an open position. This periodic operation allows the system to provide both automatic closing and sustained hold-open capabilities

Inventive Principle:

Principle #19Periodic action

2Ease of operation

If pneumatic door closers with hold open feature are used, then door hold open capability is improved, but bounce during closing occurs and components bite into the closer rod

Engineering Contradiction:

Improvedoor hold open capabilityVSAvoidcomponent wear and bounce

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The door closer uses a hydraulic damper system with a piston and damping hole to control door motion. The hydraulic fluid creates resistance that dampens bounce during closing while the piston rod extends to provide hold-open capability without mechanical biting components

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The damper characteristics are changed based on operational phase. During closing, the damper provides hard resistance to prevent bounce. During hold-open, the system transitions to a different state where the extended piston rod maintains position without requiring high damping forces, reducing wear on components

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If hydraulic door closers with hold open feature are used, then door hold open capability is improved, but physical contact with the closer rod occurs causing O-ring wear and seal failure

Engineering Contradiction:

Improvedoor hold open capabilityVSAvoidseal durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The door closer uses a hydraulic damper system with a piston and damping hole to control door motion. The hydraulic fluid creates resistance that dampens bounce during closing while the piston rod extends to provide hold-open capability without mechanical biting components

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The damper characteristics are changed based on operational phase. During closing, the damper provides hard resistance to prevent bounce. During hold-open, the system transitions to a different state where the extended piston rod maintains position without requiring high damping forces, reducing wear on components

Inventive Principle:

Principle #35Parameter changes

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 device allows secure door retention in an open position without external force and automatic closure with minimal effort, enhancing user convenience and system durability while preventing wear on internal components.

Implementation Method 1

hydraulic door closers

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

pneumatic door closers

Methodology Applied

Scientific EffectPneumatic pressure: Gas Compressor

Implementation Method 3

these pneumatic door closers continue to suffer from an undesirable 'bounce' during closing

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS10641026B2Automatic door stopping-closing device and door

Publication Date: 2020.05.05 CMECH (GUANGZHOU) INDUSTRIAL LTD

AI summary

An automatic door stopping-closing device comprises a cylinder with a connecting rod, one end of which is connected to a door; a bracket assembly on the door frame, comprising a hook connected with the other end of the rod, a movable lug cooperated with the hook, and a pull rod cooperated with the movable lug, wherein the pull rod and the hook can be engaged or disengaged. After the door is opened, the door can be kept open securely through the cooperation between the hook and the movable lug; and the door can be closed automatically by a slight push, through the cooperation between two of the hook, the movable lug and the pull rod. The automatic door stopping-closing device holds the door open without external force after the door is opened, and closes the door automatically after a slight push.