Convex Lifting Device Opening for Load Distribution
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Solution Overview
Problem
Conventional lifting devices face challenges when lifting heavy, lying or standing loads, as they often burden the lifting equipment beyond its permissible limits, leading to transverse forces that can cause chain buckling or material weakening, potentially resulting in device failure and non-compliance with safety standards.
Innovation Solution
A lifting device with a convexly shaped opening that distributes load evenly across a larger surface area, reducing transverse forces, and a pretensioning mechanism with a lever drive that minimizes pre-tensioning force and friction, allowing for safer and more efficient lifting of loads up to 4500 kg.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lifting device uses a conventional opening shape, then the structure is simple, but transverse forces cause chain buckling and device failure
Solution Approach 1:
The opening is designed with a convex curvature in cross-section, forming a bell-shaped profile that guides the lifting device smoothly. This curved geometry distributes transverse forces along the surface of the opening, preventing chain buckling and localized stress concentrations while maintaining structural reliability.
2Strength
If the lifting device has a sharp-edged opening, then manufacturing is easier, but point loads cause material weakening and tearing
Solution Approach 1:
The convex, bell-shaped opening eliminates sharp edges by providing a continuously curved surface. This geometry distributes point loads over larger surface areas, preventing localized material weakening and tearing, thereby enhancing the overall strength and durability of the lifting device.
3Force
If the lifting device experiences high transverse forces, then lifting capacity is sufficient, but the lifting mechanism is overloaded beyond permissible limits
Solution Approach 1:
The convex opening acts as an intermediary element between the lifting device and the housing. It redirects and distributes transverse forces along its curved surface, reducing the direct load on the lifting mechanism and preventing overloading while maintaining sufficient lifting capacity.
4Adaptability or versatility
If the lifting device deflects at 90 degrees or more, then horizontal loads can be lifted, but chain links buckle under transverse forces
Solution Approach 1:
The bell-shaped convex opening provides a smooth, curved guidance path that accommodates large deflection angles (90 degrees or more) while distributing transverse forces evenly. This prevents chain link buckling by eliminating sharp directional changes and concentrating stresses, thereby maintaining chain link stability during horizontal load lifting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the risk of device failure, extends service life, and complies with safety standards by distributing loads uniformly and reducing the risk of buckling, enabling safe and efficient handling of heavy loads.
Implementation Method 1
the opening in cross-section has a convex shape such that the lifting device always lies flat against the surface of the housing in the area of its opening... the stresses on the lifting device caused by transverse forces relative to the local direction of pull are reduced
Implementation Method 2
The pre-tensioning device advantageously features a lever mechanism whose operating lever can be moved manually between an open position... and a closed position
Data Source
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AI summary
A lifting device for lifting, transporting and setting down a load, such as a sheet or a blank made of sheet metal, comprising a housing (12) that defines a receiving space for at least partially receiving the load, and comprising at least two clamping jaws (22, 24, 26) that define and/or engage in the receiving space, of which at least one clamping jaw (24, 26) can be moved onto another clamping jaw (22) by means of a pretensioning device (28) for fixing the respective load and is pivotably mounted in the housing (12) about a pivot axis (30) for this purpose, wherein at least the housing (12) is movable by means of a load lifting device (32), such as a load chain, and wherein the housing (12) has an opening (88) through which the load lifting device (32) is led outwards to the environment, wherein the opening (88) has a convex profile in cross-section.