Fire-Rated Roll-Up Door Lockout Assembly for Axle Restraint
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Solution Overview
Problem
Existing fire-rated roll-up doors that automatically close upon power loss pose safety hazards during maintenance, inspections, and repairs due to stored potential energy, and traditional methods to keep them open can damage sensors or invalidate fire ratings.
Innovation Solution
A lockout tool assembly comprising a lockout tool member, first and second lockout plates, and a crossbar restraint shaft member, which forms a complementary receiving aperture to securely hold the door open without power, using a coupling member and set screws to attach to the door axle, and lockout plates to form a crossbar restraint receiving aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to keep the door open during maintenance, then the door remains accessible for work, but the stored potential energy causes safety hazards and the door may automatically close upon power loss
Solution Approach 1:
The invention extracts the dangerous stored potential energy from the system by using gravity-fed counterweights that automatically discharge when the door is opened for maintenance. This removes the harmful energy accumulation while allowing the door to remain open safely during servicing.
Solution Approach 2:
The lockout tool assembly is installed in advance before maintenance begins, and the counterweight system is pre-configured to automatically discharge energy. This preliminary preparation ensures that when maintenance personnel access the door, the dangerous stored energy has already been eliminated, preventing safety hazards.
2Ease of operation
If the door is kept open using traditional support methods, then maintenance can be performed, but sensors may be damaged or fire ratings may be invalidated
Solution Approach 1:
The lockout tool assembly acts as an intermediary device between the door mechanism and maintenance personnel. It provides a dedicated interface for safely securing the door in the open position without requiring direct interference with sensors or structural components that would compromise fire ratings.
Solution Approach 2:
The lockout tool assembly is divided into separate functional components: the tool member that interfaces with the door axle, the lockout plates that secure the position, and the crossbar restraint that prevents closure. This segmentation allows each component to perform its specific function without damaging sensors or invalidating fire ratings.
3Reliability
If the door mechanism is de-energized for personnel safety during maintenance, then electrical safety is ensured, but the door automatically closes due to fire-rated design
Solution Approach 1:
The invention uses gravity-fed counterweights that normally hold the door open but can be configured to discharge and allow automatic closure. During maintenance, the counterweight system is set to discharge, eliminating the holding force and allowing the door to remain open without power while preventing unintended closure during the maintenance window.
Solution Approach 2:
The lockout tool assembly dynamically changes the door system's behavior by mechanically overriding the automatic closure mechanism. When installed, it transforms the door from an automatically closing system to a statically held open system, allowing maintenance personnel to work safely without power while preventing the door from closing.
Data Source
AI summary
A lockout tool assembly for locking open a roll-up door that automatically closes without power is provided. A lockout tool assembly may include a lockout tool member, a first lockout plate, and a second lockout plate. The lockout plate may each define a receiving recess, such that when the first lockout plate and the second lockout plate are installed inverse to one another in a closed lockout alignment position, the receiving recesses are complementary in that they form a crossbar restraint receiving aperture. Methods for locking open a roll-up door with such lockout tool assemblies and for removing installed lockout tool assemblies are also provided.