Safety Caster Shear Plate Assembly for Lift Overload Protection
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Solution Overview
Problem
Portable automobile lifts lack a safety feature to prevent injuries or fatalities from excessive loads during transportation.
Innovation Solution
A safety caster assembly with a beam assembly, safety mechanism assembly, wheel assembly, structural cradle assembly, and fastener assembly, which includes shear plates that deform and break if the load exceeds 2000 pounds, allowing safe transportation of a stationary automobile lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If portable automobile lifts are designed for mobility and transporting heavy loads, then the lift can be moved from one place to another, but there is no safety feature to prevent injury or death when excessive load is applied
Solution Approach 1:
The shear plates are pre-installed on the caster assembly before the lift is moved. These plates are designed to fail at a predetermined load threshold, proactively preventing excessive load situations before they can cause injury or death. The safety mechanism is prepared in advance rather than reacting to overload conditions.
Solution Approach 2:
The shear plates are designed to fail or break when excessive load is applied, converting the harmful effect of overload into a beneficial safety feature. Instead of allowing the entire lift structure to fail catastrophically, the sacrificial shear plates break to prevent injury or death, transforming a potential hazard into a protective mechanism.
2Strength
If the lift structure is made strong enough to support heavy loads, then the lift can carry more weight, but it becomes difficult to detect when the excessive load threshold is exceeded
Solution Approach 1:
The shear plates incorporate visual indicators that change or become visible when the plates fail. This allows operators to easily detect when excessive load has been applied by observing the broken state of the shear plates, providing clear visual feedback without requiring complex measurement systems.
Solution Approach 2:
The failure of the shear plates under excessive load serves as a clear indicator signal. The breaking of these plates converts the invisible or difficult-to-detect overload condition into a visible, easily recognizable state that alerts operators to the excessive load situation.
3Reliability
If a safety mechanism is added to prevent excessive load, then operator safety is improved, but the device complexity increases
Solution Approach 1:
The safety function is extracted as a separate, independent component (the shear plates) that can be easily installed and replaced. Rather than integrating complexity into the main lift structure, the safety mechanism is taken out as a distinct element that performs the safety function while allowing the rest of the lift to remain simple.
Solution Approach 2:
The shear plates are designed as sacrificial, disposable components that break when needed and can be easily replaced. This approach provides robust safety protection without permanent complexity, as the simple replaceable plates eliminate the need for complex sensors, actuators, or control systems.
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
Enables the safe transportation of heavy automobile lifts by preventing excessive loads from being moved, ensuring operator safety by incorporating a mechanism that deforms and breaks under excessive weight, allowing for easy replacement of shear plates.
Implementation Method 1
shear plates that deform and break if the load exceeds 2000 pounds
Implementation Method 2
shear plates that deform and break if the load exceeds 2000 pounds
Data Source
AI summary
A safety caster assembly comprising a beam assembly. The beam assembly having a pair of side plates. The safety caster assembly further comprising a safety mechanism assembly. The safety mechanism assembly having a pair of shear plates and each shear plate of the pair of shear plates has a bolt receiver corresponding to the slot. The safety caster assembly further comprising a wheel assembly. The safety caster assembly further comprising a structural cradle assembly. The structural cradle assembly having a mount. The structural cradle assembly further having a cradle positioned on the mount. The safety caster assembly having a fastener assembly.