Dual Offset Orbital Caster with Roller Bearings
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Solution Overview
Problem
Existing caster assemblies, including single wheel and twin wheel designs, become 'locked up' when misaligned, leading to significant frictional resistance and difficulty in rolling objects in desired directions, especially when supporting large loads, as scaling up dual offset orbital mounting assemblies results in mechanical failures due to shear forces.
Innovation Solution
A heavy duty dual pivot orbital caster assembly with laterally offset mounting and roller bearing assemblies that allow the caster wheels to pivot and orbit, reducing shear and torque forces, enabling easy alignment with thrust direction and supporting loads up to ten times more than previous designs without compromising rotational freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dual offset orbital mounting assembly is scaled up to support larger loads, then load capacity is improved, but shear force on transfer plate increases causing warping and assembly failure
Solution Approach 1:
The caster assembly is divided into separate functional components: the transfer plate handles mounting and positioning, while the roller bearing assembly handles load support. This segmentation allows each component to be optimized for its specific function, preventing the transfer plate from bearing excessive shear forces that would cause warping.
Solution Approach 2:
The roller bearing assembly acts as an intermediary element between the mounting plate and the caster wheel. It mediates the load transfer by supporting the load through rolling contact rather than direct shear on the transfer plate, thereby protecting the transfer plate from warping while maintaining load capacity.
2Stability of the object's composition
If caster wheel is constrained to fixed orientation, then structural stability is improved, but ability to align with thrust direction deteriorates causing lock-up
Solution Approach 1:
The caster wheel assembly is made dynamic through the orbital mounting mechanism, allowing it to automatically adjust its orientation in response to applied thrust. The dual pivot arrangement enables the wheel assembly to rotate orbitally, dynamically aligning with the direction of force while maintaining stable support for the loaded object.
Solution Approach 2:
The caster assembly self-aligns with the thrust direction through its orbital mounting mechanism. When force is applied to the loaded object, the caster automatically pivots to the appropriate angle without requiring external intervention or complex control systems, eliminating lock-up conditions.
3Ease of operation
If caster allows free orbital rotation, then ease of maneuvering is improved, but shear force on transfer plate increases
Solution Approach 1:
The roller bearing assembly serves as an intermediary that decouples the orbital rotation function from the load-bearing function. It allows free orbital rotation for ease of maneuvering while supporting the load through rolling contact, preventing shear forces from being transmitted to the transfer plate.
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 eliminates 'lock-up' issues and significantly increases load capacity while maintaining rotational freedom, allowing for precise maneuvering and supporting heavy loads without distorting the transfer plate.
Implementation Method 1
roller bearing assemblies that extend upwardly from the upper surface of the transfer plate
Implementation Method 2
reducing shear and torque forces
Data Source
AI summary
In a heavy duty orbital caster assembly that includes a rotatable wheel unit joined to a transfer plate that pivots about a mounting post extending from a mounting plate adapted to be secured to the bottom surface of an object, the improvement comprising a pair of roller bearing assemblies that extend upwardly from the upper surface of the transfer plate adjacent to the caster wheel post as it extends through its bearing. The rollers impinge on the lower surface of the mounting plate, and serve to transfer some of the load of the supported object directly to the caster wheel, enabling the support of very heavy loads.