Panic Bar Latch Assembly With Sealed Push Rod for Cold-Room Egress
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Solution Overview
Problem
Existing latch release mechanisms in cold rooms are difficult to operate, especially in panic situations, due to the need for hand strength and dexterity, and are prone to mechanical failure or freezing, making it hard for individuals to escape.
Innovation Solution
A panic bar latch assembly with a pivotal handle, elongated push bar, and push rod system that allows easy operation from inside or outside the cold room, featuring a conical receiver and sealed rod guide to prevent freezing and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a threaded rod knob is used for inside release, then the latch can be mounted securely to the door, but the device becomes difficult to operate in panic situations and requires hand strength and dexterity
Solution Approach 1:
The invention extracts the threaded rod mounting mechanism from the operational knob function. The knob is mounted to the door using a threaded rod for secure attachment, but the release mechanism is separated into a distinct push-actuated interior release component that operates independently of the mounting structure.
Solution Approach 2:
A push rod acts as an intermediary between the interior latch release and the exterior latch mechanism. When the elongated bar is pushed, it actuates the interior release which moves the push rod, which in turn actuates the exterior latch to release the strike, providing a mechanical mediation that translates simple push motion into latch release.
2Ease of operation
If a bar latch directly actuates the strike through linkage, then the bar can simply be pushed to operate the latch, but the linkage becomes inoperable over time due to wear
Solution Approach 1:
The push rod serves as a floating intermediary that connects the interior latch release to the exterior latch without requiring direct mechanical linkage through the door. This eliminates the wear-prone linkage components while maintaining the push-to-release functionality.
Solution Approach 2:
The latch system is segmented into separate functional components: the interior latch release, the push rod, and the exterior latch. Each component operates independently within its own domain, reducing the mechanical interconnections that are susceptible to wear and failure.
3Device complexity
If a floating push rod is used between interior release and exterior latch, then direct coupling is avoided, but the push rod may not return to initial position and air passage causes ice formation
Solution Approach 1:
The push rod is designed as a floating intermediary that moves freely within a sealed conduit. The seal prevents air passage and ice formation, while the floating design allows the push rod to return to its initial position through the action of the interior latch release without requiring active return mechanisms.
Solution Approach 2:
A seal is provided within the push rod conduit to prevent air passage between the door and the push rod. This seal creates a sealed environment that prevents moisture accumulation and subsequent ice formation, while still allowing the push rod to move freely within the sealed space.
4Stability of the object's composition
If a rounded push rod end is received in a rounded receiver recess, then misalignment is prevented, but the coupling requires precise manufacturing
Solution Approach 1:
The push rod end and the receiver recess are both formed with rounded or conical surfaces. This curvature allows for self-aligning engagement that is tolerant of manufacturing variations, as the rounded surfaces naturally guide each other into proper alignment during assembly and operation.
Data Source
AI summary
A panic bar latch release assembly has an inside latch release and an outside pull type handle latch. The handle latch includes a pivotal pull handle and an adaptor having a rounded receiver recess. An elongated push rod is positioned within a push rod channel of the door so as to extend from the inside latch release to the rounded receiver recess of the outside handle latch. The push rod includes a coupler that physically couples the push rod to the interior latch release. The panic bar latch release assembly also includes an outside rod guide that includes an O-ring seal through which the push rod extends to prevent air from passing between the push rod and the door.