Offset Frame Leg for Sectional Door Floor Bulging
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Solution Overview
Problem
Conventional sectional doors experience malfunctions and rust formation due to incomplete compaction of concrete floors during installation, leading to bulging and deformation of frame rails, which affects door movement and stability.
Innovation Solution
The lower edge of the fastening leg is vertically offset above the contact leg, allowing for floor bulging without damaging the frame rail and enabling smoother concrete compaction, ensuring stability and reliable door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame beams are installed on the floor before concrete compaction is completed, then installation can proceed earlier, but the floor bulging during compaction causes damage to frame rails and guide rail segments
Solution Approach 1:
The frame beam is divided into two separate legs: a support leg that contacts the floor and a fastening leg that extends upward. This segmentation allows the support leg to remain stable on the floor while the fastening leg remains clear of the compaction zone, preventing damage during concrete compaction operations.
Solution Approach 2:
The fastening leg is positioned in a different spatial dimension (vertically above the support leg) rather than extending horizontally along the floor. This vertical offset removes the fastening leg from the horizontal plane where floor bulging occurs during compaction, eliminating the damage risk while allowing early installation.
2Ease of manufacture
If frame beams have sharp edges from manufacturing, then production is simpler, but the sharp edges cause damage to the floor and frame stile during installation
Solution Approach 1:
The lower edge of the support leg is given a specific geometric configuration (angled or rounded profile) that is different from the rest of the frame beam. This local modification concentrates the protective function at the critical contact point with the floor, preventing damage without requiring complex modifications elsewhere in the structure.
3Ease of manufacture
If frame beams are made entirely of galvanized sheet steel, then manufacturing is easier, but rust formation occurs in the area of the lower edge during long-term operation
Solution Approach 1:
The frame beam uses different materials for different parts: galvanized sheet steel for the main structure and plastic for the lower edge of the support leg. This local material differentiation protects the vulnerable lower edge area from corrosion and floor contact damage while maintaining the manufacturing simplicity of using galvanized steel for the majority of the structure.
Solution Approach 2:
The frame beam combines two materials with complementary properties: galvanized sheet steel provides structural strength and corrosion resistance for the main body, while plastic provides additional corrosion protection and floor protection at the lower edge. This composite construction addresses the limitations of using a single material throughout.
Data Source
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AI summary
A gate with a gate leaf that is movable between an open position and a closed position, in which it is arranged approximately in a vertical plane, and two frame members arranged in the area of the lateral edges of the opening to be closed by the gate leaf and extending substantially over the entire height of the gate leaf from the bottom of the opening and designed as an angle profile with a bearing leg that can be placed against the wall having the opening and a fastening leg that runs approximately perpendicular to a horizontal (perpendicular to the longitudinal axis) section plane, characterized in that the lower edge of at least one fastening leg is arranged at least partially vertically offset above the lower edge of the bearing leg of the corresponding frame member.