Tilt-up door vertical track mechanism 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 to maintain structural integrity under loads like rain, snow, and wind.

Innovation Solution

A tilt-up door system featuring vertically juxtaposed channel members with horizontally extending pivot shaft tubes and carriages, supported by a truss and actuated by hydraulic cylinders, which allows the door to pivot and open without sagging, providing structural support and easy operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional sectional overhead doors are used for wide openings, then the door can be operated easily, but the door panels sag in the middle when opened

Engineering Contradiction:

Improvedoor operationVSAvoiddoor panel stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The door is divided into multiple horizontal panels that can move independently along vertical tracks, allowing each panel to be supported separately and preventing sagging while maintaining ease of operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door panels move from a horizontal swinging motion to a vertical sliding motion, changing the dimension of movement to eliminate sagging issues while preserving operational ease

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If a single panel door with a truss is used to prevent sagging, then the door structural integrity is improved, but the device complexity increases

Engineering Contradiction:

Improvedoor structural integrityVSAvoiddoor structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

Instead of using a complex truss structure within a single panel, the door is segmented into multiple smaller panels that rely on mutual support and vertical tracking, reducing the need for internal reinforcement while maintaining structural integrity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Vertical tracks and rollers are introduced as intermediary elements between the door panels and the door frame, providing support and preventing sagging without requiring complex internal truss structures

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If conventional doors are used for openings wider than 15-25 feet, then the door can cover the opening, but the door cannot prevent sagging under environmental loads

Engineering Contradiction:

Improvedoor opening coverageVSAvoiddoor performance under load

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The large door area is divided into multiple smaller panels that distribute environmental loads more effectively, preventing sagging while maintaining full coverage of wide openings

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door panels are designed to move dynamically along vertical tracks, allowing them to adjust and maintain proper alignment under varying environmental loads, improving reliability

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9404301B2Tilt-up door

Publication Date: 2016.08.02 HIGHER POWER HYDRAULIC DOORS LLC

AI summary

A tilt-up door for a building having an opening and a pair of substantially vertically juxtaposed channel members. The door can be pivotally coupled to carriages arranged for vertical movement along the vertically juxtaposed members. An actuator or actuators can be connected to the carriages to move the carriages along the vertically juxtaposed channel members. When the actuator or actuators are operated to move the carriages vertically along the vertically juxtaposed channel members.