Parallel Link Door Engagement Device for Adjustable Alignment

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Solution Overview

Problem

The existing elevator door engagement devices face issues when a new engagement device is installed, as it may not match the size of the existing engaged part on the landing door, leading to delayed or improper opening and closing, and potential contact that can cause breaking of interlock electric contacts and emergency stops.

Innovation Solution

A door engagement device with a first and second member extending vertically, forming a parallel link mechanism, and a restricting part that allows adjustable pivotal movement between predetermined positions to ensure proper engagement and alignment with the engaged part, preventing contact and ensuring synchronized door operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If a new engagement device is installed with a different size, then the device can be replaced for repair or manufacturer changes, but the distance between the first member and second member may not match the engaged part, causing improper engagement or contact

Engineering Contradiction:

Improveengagement device replacementVSAvoiddistance between first member and second member

Core Design Contradiction:

Ease of repairVSManufacturing precision

Solution Approach 1:

The first member is designed to pivotally move between a predetermined first position and a predetermined second position through a parallel link mechanism, allowing dynamic adjustment of the distance between the first member and second member to match different engaged part sizes

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The restricting part releasably restricts the pivotal movement of the first member at the first position, enabling parameter changes in the distance between members by releasing or applying the restriction to adapt to different engagement device sizes

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the distance between the first member and second member is fixed, then the structure is simple, but the landing door cannot timely follow the car door opening and closing, causing delays

Engineering Contradiction:

Improvestructure simplicityVSAvoiddoor opening and closing synchronization

Core Design Contradiction:

Device complexityVSSpeed

Solution Approach 1:

The parallel link mechanism enables the first member to pivotally move while maintaining its vertical posture, dynamically adjusting the distance between members during door operation to ensure the landing door timely follows the car door opening and closing

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The engagement device is divided into movable first member and fixed second member, with the first member capable of pivotal movement between predetermined positions, allowing independent adjustment to maintain synchronization speed

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the engagement device size does not match the engaged part, then replacement flexibility is reduced, but contact between interlock rollers and blades may occur, causing breaking of interlock electric contacts

Engineering Contradiction:

Improveengagement device compatibilityVSAvoidinterlock electric contact stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The restricting part can releasably restrict the pivotal movement of the first member at different positions, allowing parameter changes in the distance between members to match different engaged part sizes, preventing contact between interlock rollers and blades

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The parallel link mechanism replaces a fixed mechanical connection with a movable one, allowing the first member to adjust its position dynamically to maintain proper engagement without contact, replacing the need for precise pre-matching of engagement device size

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11440775B2Door engagement device

Publication Date: 2022.09.13 FUJITEC CO LTD

AI summary

Provided is a door engagement device including: a first member that extends in a vertical direction and is able to come into contact with an engaged part from a door closing direction side; a second member that extends in the vertical direction at a position with a distance from the first member to a door opening side and is able to come into contact with the engaged part from a door opening direction side; a pair of link members that form a parallel link mechanism in cooperation with the first member so as to enable the first member to pivotally move between a predetermined first position and a predetermined second position located closer to the door closing direction side than the first position while keeping the posture of the first member; and a restricting part that releasably restricts the pivotal movement of the first member at the first position.