Tilt-up door truss support for wide opening sagging
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Solution Overview
Problem
Conventional sectional overhead doors are not suitable for door openings wider than 15′ to 25′ due to sagging issues when opened, as they lack sufficient support for the door panels.
Innovation Solution
A tilt-up door system with vertically juxtaposed members, hydraulic cylinders, and a truss for support, allowing the door to pivot and lift vertically, preventing sagging and accommodating wider openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional sectional overhead doors are used for wide openings, then the door can cover the opening, but the door panels sag in the middle when opened
Solution Approach 1:
The door is divided into multiple horizontal panels that can pivot independently, with each panel supported by vertical trusses. This segmentation allows the door to span wide openings while distributing the load to prevent sagging of individual panels.
Solution Approach 2:
The door panels are equipped with vertical trusses that extend in the vertical dimension, providing structural support against gravitational forces. This vertical reinforcement prevents the panels from sagging while maintaining the horizontal span capability.
2Stability of the object's composition
If a single panel door with truss support is used, then sagging is prevented, but the device complexity increases
Solution Approach 1:
The door system is segmented into multiple lighter panels with distributed truss support, rather than one large panel. This reduces the complexity of individual components while maintaining overall stability through the collective structure.
Solution Approach 2:
The door panels are designed to pivot dynamically during operation, transitioning from a horizontal closed position to a vertical open position. This dynamic capability allows the door to maintain stability in both positions while reducing the need for complex fixed support structures.
3Area of stationary object
If the door is made wider to accommodate large openings, then the opening coverage is improved, but the door becomes more prone to sagging
Solution Approach 1:
The wide door opening is covered by multiple smaller panels arranged horizontally, each with its own truss support. This segmentation allows the door to span large openings while maintaining the strength and rigidity of individual panels, preventing sagging.
Solution Approach 2:
The door panels utilize composite construction combining horizontal paneling with vertical truss elements, creating a structurally superior assembly that resists sagging while covering wide openings. The composite structure leverages the strengths of both horizontal and vertical components.
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
The tilt-up door system effectively prevents sagging and supports the door in wider openings, ensuring stability and functionality even under load conditions like rain, snow, and wind.
Implementation Method 1
A hydraulic circuit can connect a hydraulic pump to the supply ports. When hydraulic pump is operated the hydraulic cylinders move the carriages vertically along the juxtaposed members.
Data Source
AI summary
A tilt-up door for a building having an opening, a pair of substantially vertically juxtaposed members, cam surfaces extending laterally from the vertical members at the upper portion and a door sized to span the opening. The door can be pivotally coupled to carriages arranged for vertical movement along the vertical members and can have cam followers extending laterally from the upper portion of the door to contact the cam surfaces. Hydraulic actuators can be connected to the carriages to move the carriages along the vertical members. When the actuator or actuators are operated to move the carriages vertically along the members the cam followers can move along the cam surfaces to tilt the door to a horizontal position as the door is moved vertically upward into an open raised position.