Elevator Shaft Access Safety Device with Closed-Door Mounting
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Solution Overview
Problem
There is a need for an improved elevator shaft access safety device that can secure personnel to a harness while the landing doors are closed, as existing solutions require the doors to be opened for installation, leaving a time window where personnel is unprotected from falling.
Innovation Solution
An elevator shaft access safety device comprising a substantially L-shaped body with elongated sections and a clamp that secures to the casing, allowing the device to be mounted with the landing doors closed, featuring a clamping mechanism that biases the abutments and clamping member towards each other, and an attachment point for a rope harness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temporary structures are used to secure personnel to harness, then personnel can be secured to access the elevator shaft, but the landing doors must be opened for installation creating a time window where personnel is unprotected from falling
Solution Approach 1:
The safety device is designed to be installed and secured to the casing before the landing doors are opened. The device includes a body that can be positioned against the casing and a clamp that can be engaged with the casing structure, allowing the harness attachment point to be in place prior to door opening, thereby eliminating the unprotected time window
Solution Approach 2:
The safety device acts as an intermediary structure between the landing door and the harness. It provides a secure mounting point that can be established independently of the door position, mediating the connection between the fixed casing structure and the movable harness system
2Reliability
If landing doors are opened to install safety structures, then personnel can be secured to harness, but the doors remain open creating a hazard during installation
Solution Approach 1:
The device is installed and secured to the casing before the landing doors are opened. The body of the device is positioned against the casing and the clamp is engaged with the casing structure, establishing the safety harness attachment point in advance, so that when the doors are opened, the protection is already in place and the doors can be opened safely without creating a hazard
3Reliability
If permanent structures are provided outside the elevator shaft, then personnel can be securely harnessed, but aesthetic and safety reasons prevent such permanent structures from being installed
Solution Approach 1:
The safety device serves as a temporary intermediary structure that utilizes the existing casing of the elevator shaft access. Instead of requiring permanent external structures, the device mounts to the casing using a clamp that engages with the casing structure, providing a secure attachment point for the harness while respecting the aesthetic and safety constraints against permanent external installations
Solution Approach 2:
The device is designed to be universally applicable to different elevator shaft access configurations. The body and clamp can be positioned to engage with various casing geometries, making the device adaptable to different locations and conditions without requiring location-specific permanent structures
Data Source
AI summary
An elevator shaft access safety device for an elevator shaft access provided with landing doors extending thereacross, the landing doors being flanked by substantially vertical first and second jambs, the elevator shaft access safety device being securable to the first and second jambs while the landing doors remain closed.