Round Sling End Connection via Lateral Opening
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Solution Overview
Problem
Conventional round slings with hollow braided coverings face issues such as uneven yarn loading, increased wear, and handling difficulties due to their flat cross-sectional shape and loose structure, as well as challenges in securely connecting the end sections without compromising tensile strength or causing damage under high loads.
Innovation Solution
A round sling design featuring a hollow braid sheath with overlapping end sections and a securing element passed through lateral openings, which securely connects the end sections using a flexible securing element like a strip or band, ensuring stability and preventing unintentional separation under high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ends of the hollow braided covering are sewn together, then the covering can be connected, but the inner scrim is pierced and cannot optimally align under load, causing premature breakage
Solution Approach 1:
A securing element made of flexible, load-distributing material (webbing, strap, or chain) is introduced as an intermediary between the end sections of the hollow braided covering. This securing element connects the end sections without piercing the inner scrim, allowing the inner scrim to optimally align under load while still providing secure connection. The securing element distributes loads evenly across the connection zone, preventing stress concentrations that would cause premature breakage.
2Ease of manufacture
If adhesive or welded connections are used to connect the covering ends, then connection is achieved, but the joint is subjected to unfavorable shearing forces under tensile loads, leading to peeling or tearing
Solution Approach 1:
The securing element acts as a mechanical intermediary that replaces adhesive or welded connections. It connects the end sections through friction, tension, or interlocking mechanisms without creating weak bonded joints. The flexible nature of the securing element allows it to accommodate movements and distribute forces, preventing the peeling and tearing that occur with rigid adhesive or welded joints under tensile and shear loads.
3Manufacturing precision
If the cover cross-section is large to compress and create reliable inner layer winding, then the round sling has relatively flat cross-sectional shape, but this causes folds on the underside, increased wear, and weakened tensile strength
Solution Approach 1:
The patent changes the geometric parameters of the hollow braided covering, specifically maintaining a more circular cross-sectional shape rather than allowing it to flatten. This is achieved by controlling the braiding process and the compression applied during manufacturing. By maintaining a circular cross-section, the covering avoids forming folds when the round sling describes radii on contact surfaces, thereby preventing increased wear and maintaining optimal force flow and tensile strength in the inner layer.
4Ease of operation
If the inner scrim is guided loosely in the cover, then the cover can accommodate the inner layer, but the individual yarns can shift against one another, causing uneven loading
Solution Approach 1:
The hollow braided covering is designed with specific local qualities in different zones: in the connection zone, the covering has sufficient compression and structural integrity to prevent yarn shifting and ensure even load distribution; in other zones, the covering maintains appropriate flexibility for handling. The braiding pattern and material selection create regions with different degrees of yarn restraint, allowing the inner scrim to be securely held where needed while maintaining overall flexibility.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
The invention relates to a round sling (1) for raising loads, having an inner clutch (15) and a sheath (2) accommodating the inner clutch (15), that is designed as a hollow braid and the end sections (3, 4) thereof being connected to one another in a connection zone (5), inserted into one another and overlapping each other. The advantages of a hollow braid sheath in said round sling in a simple and cost-effective production method can be utilized in that, according to the invention, at least one guiding lateral opening (8a, 8b) is formed in the end section (4) on the outside of the connection zone (5), on the circumferential surface of the end section (4), and that a retaining element (11) is held on the end section (3) on the inside of the connection zone (5) and is led through the opening (7a, 7b) of the end section (4) on the outside.