Elevator Sheet Metal Base Panel With Recessed Edge Stiffeners
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Solution Overview
Problem
Existing sheet metal base panels for elevators are not effectively reduced in thickness without compromising structural integrity and are not installation-friendly due to asymmetrical fixing holes.
Innovation Solution
A sheet metal base panel design featuring bended edges with inner recesses and multiple types of stiffeners, including a first type parallel to the longitudinal direction, a second type partially in the inner recesses of the sides, and a third type parallel to the transverse direction, with specific bendings and hemmings to enhance structural rigidity while reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the thickness of sheet metal base panel is reduced, then weight and material cost are reduced, but structural integrity and strength are compromised
Solution Approach 1:
The base panel is segmented into multiple functional zones with different thicknesses: a first region with greater thickness for structural support, and a second region with lesser thickness for weight reduction. This segmentation allows the panel to achieve both weight reduction and maintained structural integrity by concentrating material where needed.
Solution Approach 2:
Different regions of the base panel are assigned different local qualities in terms of thickness. The first region (central area) has greater thickness to provide structural strength, while the second region (peripheral area) has lesser thickness to reduce weight. This local differentiation resolves the contradiction between overall weight reduction and localized strength requirements.
2Ease of manufacture
If uniform thickness is used throughout the panel, then manufacturing is simplified, but material is wasted in non-critical areas
Solution Approach 1:
The base panel employs local quality by varying thickness across different regions. The first region has greater thickness while the second region has lesser thickness, allowing material to be concentrated where structurally necessary and reduced where less critical, thereby minimizing material waste while maintaining manufacturing feasibility through defined regional specifications.
3Strength
If thicker sheet metal is used, then structural strength is improved, but weight and material cost increase
Solution Approach 1:
The base panel is divided into a first region requiring greater thickness for structural strength and a second region where lesser thickness suffices. This segmentation eliminates the need to use thick material throughout the entire panel, reducing overall weight while maintaining necessary structural strength in critical areas.
Solution Approach 2:
Different local qualities of thickness are assigned to different regions: the first region has greater thickness to provide structural strength, while the second region has lesser thickness to reduce weight. This local differentiation optimizes the balance between strength and weight by matching material distribution to functional requirements.
Data Source
Figure 1a~2
Figure 3~4
Figure 5
AI summary
A sheet metal base panel (1) for use in elevators, comprising: - a single main body (2) developing from a top side (2a) to a bottom side (2b) and from a left side (2c) to a right side (2d), wherein edges (3) of both the top side (2a) and bottom side (2b) and of both the left side (2c) and right side (2d) are bended, as a reinforcement, backwards and inwards so as to define for each side an inner recess (4) developing along the corresponding side (2a, 2b, 2c, 2d); - at least one stiffener of a first type (10) developing longitudinally and attached to a middle area of the rear side (2f) of the main body (2); - at least two stiffeners of a second type (20) developing longitudinally and at least partly arranged in the inner recesses (4) respectively of the left side (2c) and right side (2d); - at least one stiffener of a third type (30) developing transversally and at least partly arranged in the inner recess (4) of the top side (2a).