Wheel Dolly Lever Adjustment for Heavy Vehicle Lifting
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Solution Overview
Problem
Existing wheel dollies, such as the GOJAK ®< line, have a fixed stroke distance for the actuation lever, which may not provide sufficient mechanical advantage when lifting exceptionally heavy vehicles, making it difficult for users to actuate the dolly comfortably.
Innovation Solution
A wheel dolly with adjustable starting height for the actuation lever, allowing users to select between full-height and reduced-height modes, thereby modifying the force required to actuate the dolly and the distance of translation per cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the actuation lever starting height is lowered to increase mechanical advantage, then the force required to actuate the dolly is reduced, but the translation distance per cycle is reduced
Solution Approach 1:
The actuation lever is made adjustable in starting height, allowing the user to dynamically change the lever arm length. This enables the system to adapt between two operational modes: full-height mode for maximum translation distance and reduced-height mode for increased mechanical advantage and reduced actuation force, resolving the contradiction between force and translation distance.
Solution Approach 2:
The starting height of the actuation lever is changed as a variable parameter rather than being fixed. By providing two selectable positions (full-height and reduced-height), the system allows users to change the geometric parameter of the lever arm to optimize performance based on the specific lifting task, whether that requires maximum distance or minimum force.
2Ease of operation
If the actuation lever starting height is lowered to make cycling more comfortable, then ease of operation is improved, but the number of actuation cycles required is increased
Solution Approach 1:
The adjustable actuation lever height allows users to dynamically select between comfort-oriented operation (reduced-height mode with lower force requirements) and efficiency-oriented operation (full-height mode with greater translation per cycle), enabling adaptation to different user needs and vehicle weights.
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 adjustable starting height provides increased mechanical advantage, reducing the force needed to actuate the dolly, making it easier to use, especially when lifting heavy vehicles, while maintaining the ability to choose a preferred mode of operation.
Implementation Method 1
a user of a wheel dolly might desire to increase mechanical advantage in trade for a greater number of actuation cycles to complete the lift
Implementation Method 2
the user may wish to lower the starting height of the actuation lever and the foot pedal (i.e., lengthen the lever arm) to reduce the initial downward force needed to actuate the wheel dolly
Implementation Method 3
a bidirectional, double pawl, lever ratchet mechanism that, when the user pumps an actuation lever, drives two opposed rollers against the vehicle's wheel
Data Source
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AI summary
A wheel dolly capable of lifting the wheel of a vehicle in response to the cycling of an actuation lever is described. The wheel dolly allows a user to select an operational mode wherein the starting height of the actuation lever is reduced. With the lower starting height, a user may be able to actuate the wheel dolly with less force and may find using the wheel dolly more comfortable