Slideable Prop Rod Assembly for HVAC Door Stability Under Wind Load
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Solution Overview
Problem
HVAC system doors in outdoor environments are prone to being pushed by wind and other environmental factors, interfering with maintenance and repair tasks, and existing solutions like lockable hinges compromise the seal when closed.
Innovation Solution
The implementation of slideable prop rod assemblies that hold hinged doors in an open position, allowing unobstructed access and preventing doors from rotating, even in adverse weather conditions, while maintaining a secure seal when closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lockable hinges are used to keep doors open, then door stability is improved, but the seal is compromised when closed
Solution Approach 1:
The door holding mechanism is segmented into two distinct components: a prop rod assembly for maintaining the door in an open position, and a separate latch mechanism for securing the door when closed. This segmentation allows each component to optimize its function without compromising the other, resolving the contradiction between door stability when open and seal integrity when closed.
Solution Approach 2:
A prop rod serves as an intermediary element between the door and the HVAC system housing. The prop rod transfers and distributes wind loads away from the door hinge and seal areas, preventing direct force transmission that would compromise seal integrity while maintaining door stability in the open position.
2Ease of operation
If doors are left open for maintenance access, then ease of operation is improved, but wind exposure causes doors to slam closed and bump operators
Solution Approach 1:
The prop rod assembly is positioned and configured to preemptively counteract wind forces before they can cause the door to slam closed. By establishing mechanical support in advance, the system prevents the harmful action of wind-driven door movement, protecting operators from bumps and ensuring stable maintenance access.
Solution Approach 2:
The prop rod acts as an intermediary structure that absorbs and redirects wind loads, preventing direct transmission of these forces to the door and operator. This intermediary element maintains door stability while allowing the door to remain accessible for maintenance work.
3Stability of the object's composition
If a prop rod assembly is added to hold doors open, then door stability in open position is improved, but device complexity increases
Solution Approach 1:
Instead of using a complex active mechanism to hold the door open, the design inverts the approach by using a simple passive prop rod that relies on gravity and friction to maintain the door in the desired position. This inversion from active to passive mechanics reduces device complexity while maintaining stability.
Solution Approach 2:
The prop rod assembly uses simple, inexpensive components that can be easily manufactured and replaced if needed. The bracket, rod, and fasteners are basic mechanical elements that minimize complexity while achieving the functional goal of holding the door stable in the open position.
Data Source
AI summary
Sliding prop rod assemblies are disclosed for hinged doors. Some embodiments may include heating, ventilation, and air conditioning systems that have a housing, a first door configured to provide access to an interior portion of the housing, and a first bracket coupled to the first door, the first bracket comprising a first aperture and a first slot. Embodiments may include a first rod coupled to the housing and configured to engage the first aperture when the first door is in an open position, and to engage the first slot when the first door is in a closed position, where the first rod prevents the first door from rotating when the first rod is engaged with the first aperture.