Bulk Bag Lifting Straps with Isolated Sleeves
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Solution Overview
Problem
Existing bulk goods bags are costly to produce, prone to deformation, and have inadequate load distribution and safety due to complex and easily damaged inflatable ring structures or integral sleeves that are stressed during lifting.
Innovation Solution
A bag design featuring lifting straps with end sections secured to the sides and interconnected by sleeves that are not directly attached to the main body, allowing optimal forklift operation while distributing load effectively and reducing stress on the sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sleeves are made as an integral part of the bag sides, then the bag structure is simplified, but the sleeves are subjected to important stresses and cause undesired deformation during lifting
Solution Approach 1:
The lifting strap is divided into three distinct sections: first end section (18a) and second end section (18b) that are secured to the bag sides, and an intermediate section (18c) that rises above the top surface. This segmentation allows the sleeves (17) to connect only at the terminal ends to the intermediate section, isolating the sleeves from stress during lifting operations while maintaining structural integrity.
2Ease of operation
If inflatable ring structures are used for lifting, then lifting capability is improved, but the production cost increases and the structures are complex and easily damaged
Solution Approach 1:
The patent replaces expensive, complex, and fragile inflatable ring structures with simple fabric lifting straps (18) that are secured to the bag sides. These lifting straps are made from the same durable fabric material as the bag itself, eliminating the need for inflatable components while providing reliable lifting capability through the intermediate section (18c) that rises above the top surface.
3Strength
If sleeves are directly attached to the main body of the bag, then the connection is stronger, but the sleeves cannot remain parallel during bag bulging
Solution Approach 1:
The sleeves (17) are extracted from direct attachment to the main body of the bag and instead connected only to the terminal ends of the lifting straps (18). This separation allows the sleeves to remain substantially parallel to one another during bag bulging, as they are not constrained by direct attachment to the expanding bag body. The connection strength is maintained through the lifting strap intermediate section (18c) which acts as a buffer.
4Ease of manufacture
If lifting straps are secured only at one end to the bag, then the production is simpler, but the load distribution is inadequate and safety is reduced
Solution Approach 1:
Each lifting strap (18) is segmented into a first end section (18a) and a second end section (18b), both of which are secured to the bag sides at different locations. This dual-attachment segmentation ensures adequate load distribution across the bag structure while maintaining production simplicity. The intermediate section (18c) connects the two end sections, allowing the lifting function to operate effectively.
Data Source
AI summary
A bag for the transport and storage of bulk goods including a main body having at least a bottom part and four sides connected in pairs along adjacent edges to form vertical ridges at four corners of the bag. The bag further includes four lifting straps, each having first and second end sections and an intermediate section rising above a top surface of the bag. The lifting straps are interconnected in pairs by two sleeves to form tubings or ducts extending longitudinally along a top surface of the bag to allow lifting of the bag by means of a forklift. The sleeves are connected to the main body of the bag via the lifting straps and are not attached longitudinally to the main body of the bag. Furthermore, the first and second end sections of each lifting strap are secured to corresponding sides of the bag.