Elevator Landing Jamb Fire-Resistant Design Plate Fixing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing elevator landing jamb designs face challenges in maintaining fire protection performance while achieving high design quality, as changes in material or adhesive degradation lead to potential gaps and reduced fire resistance due to thermal expansion differences.

Innovation Solution

A landing jamb design featuring a jamb main body with superposed design plates and fixtures that include stud bolts, main nuts, and intermediate members with lower melting points, allowing for controlled displacement during a fire to reduce deformation forces on the jamb main body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a design panel made of a different material is bonded to a jamb main body, then design quality is improved, but the design panel may fall due to adhesive degradation

Engineering Contradiction:

Improvedesign qualityVSAvoidpanel retention

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The fixing system is segmented into multiple components: jamb main body, design panel, stud bolts, main nuts, and intermediate members. This segmentation allows the design panel to be securely attached while enabling controlled separation through the sacrificial intermediate members, resolving the contradiction between secure retention and controlled release capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The intermediate members are designed as sacrificial, disposable components with lower melting points than the stud bolts and main nuts. These inexpensive intermediate members are intended to melt and fail first during fire exposure, allowing the expensive design panel and structural jamb to be protected while the intermediate members are replaced afterward.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If the design panel is fixed to the jamb main body with stud bolts, then retention is improved, but fire protection performance is degraded due to thermal expansion differences

Engineering Contradiction:

Improvepanel retentionVSAvoidfire protection performance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The intermediate members serve as intermediary components between the design panel and the structural jamb main body. During fire exposure, these intermediate members with lower melting points melt and allow controlled displacement of the design panel, preventing thermal stress transfer and protecting the fire protection performance of the jamb main body while maintaining panel retention under normal conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the jamb main body is stretched and deformed by thermal forces, then design panel retention is maintained, but fire protection performance is degraded due to gap formation

Engineering Contradiction:

Improvepanel retentionVSAvoidfire protection performance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The potential harmful thermal expansion forces are converted into a beneficial controlled displacement mechanism. The intermediate members with lower melting points are designed to fail in a controlled manner during fire, allowing the design panel to move and relieve thermal stress, thereby preventing uncontrolled deformation of the jamb main body and maintaining fire protection performance. The harmful thermal stress is thus transformed into a controlled, beneficial separation mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Prevents degradation of fire protection performance by allowing controlled displacement of design plates, thereby maintaining structural integrity and enhancing design quality.

Implementation Method 1

a melting point of a material used to form the intermediate member is lower than a melting point of a material used to form the stud bolt and a melting point of a material used to form the main nut

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 2

there is a fear in that fire protection performance is degraded... due to a difference in coefficient of thermal expansion

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentEP3342745B1Landing jamb for elevator

Publication Date: 2020.07.22 MITSUBISHI ELECTRIC CORP

Figure 1
Figure 2
Figure 3

AI summary

Provided is a landing jamb including a jamb main body having surfaces on which a design plate being flat plate having a larger plate thickness than a plate thickness of the jamb main body is superposed. The design plate is fixed to the jamb main body by a plurality of sets of fixtures. Each of the fixtures of at least one set of fixtures includes a stud bolt, a main nut screwed over the stud bolt, and an intermediate member through which the stud bolt is caused to pass, and which is interposed between the main nut and the jamb main body. A melting point of a material used to form the intermediate member is lower than a melting point of a material used to form the stud bolt and a melting point of a material used to form the main nut.