Bell Crank Lifting Apparatus for Lateral Motion Compensation
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Solution Overview
Problem
Conventional lifting devices, such as car jacks and larger lifting equipment for heavy vehicles, face stability issues due to susceptibility to side loads and are often bulky and heavy, making them unstable on uneven or soft surfaces, and difficult to transport.
Innovation Solution
A lifting apparatus featuring a base, a bell crank mechanism, a longeron assembly, and a biasing device that converts vertical forces into lateral forces to stabilize the lift and compensate for lateral shifts of the vehicle, ensuring the lift remains constant and preventing the apparatus from tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional car jacks are designed to withstand only vertical loads, then the device complexity is reduced, but the stability deteriorates when subjected to side loads or on uneven surfaces
Solution Approach 1:
The patent applies the dynamics principle by making the longeron assembly movable rather than fixed. The longeron assembly can pivot about a first axis and the second end can pivot about a second axis, allowing the jack to dynamically adapt to lateral shifts and uneven surfaces. This dynamic capability enables the jack to maintain stability under side loads without requiring an overly complex rigid structure.
2Power
If lifting devices for heavy vehicles are made bulky and heavy to increase lifting capacity, then the lifting power is improved, but the portability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the lifting device into modular components: a base, a longeron assembly with pivot points, a bell crank, and a lift member. This modular segmented structure allows the device to maintain high lifting power through mechanical advantage while being composed of smaller, more manageable parts that can be easier to transport and assemble compared to a single bulky unit.
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 apparatus maintains stability and prevents tipping on uneven surfaces and during lateral shifts, allowing for safe lifting and transportation of heavy vehicles, even on soft or uneven terrain, while being more portable and efficient.
Implementation Method 1
a bell crank mechanism, a longeron assembly, and a biasing device that converts vertical forces into lateral forces to stabilize the lift and compensate for lateral shifts of the vehicle
Implementation Method 2
the longeron assembly being pivotably coupled to the base toward the first end and rigidly coupled to the coupling member toward the second end, the second end pivoting about at least one of a first axis and a second axis, with respect to the base, in response to a movement of the vehicle
Data Source
AI summary
A lift apparatus for lifting a structure includes a base, a bell crank pivotably coupled to the base, a coupling member for engaging a portion of the structure, pivotably coupled to the bell crank device via at least one lift member, and a longeron assembly having a pivoting apex and configured to pivot about the base. The apparatus also includes a biasing device having a first end pivotably coupled to the bell crank device for applying a force thereto, the bell crank device converting the first force to a second force and applying the second force to the coupling member via the lift member for lifting the structure. A movement of the structure is compensated by rotation of portions of the longeron assembly which repositions the apex, the bell crank, and lift arm to maintain the structure in the lifted position.