Adjustable Height Grill Rack with Lever and Ratchet Mechanism
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Solution Overview
Problem
Existing grill systems face challenges in efficiently adjusting the height of large or heavy food racks relative to the fire, particularly when using charcoal or wood, as existing mechanisms are either cumbersome or difficult to clean.
Innovation Solution
A grill top system featuring a lever with a ratchet mechanism and parallelogram bars that allows for easy height adjustment of the rack, with a handle positioned away from the fire to minimize effort, and a self-engaging ratchet system for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a threaded crank mechanism is used to raise and lower the rack, then larger weight can be handled, but the mechanism becomes hard to operate and difficult to clean when contaminated by ash and dirt
Solution Approach 1:
The ratchet mechanism automatically engages with the toothed bar under the weight of the rack, holding it in position without requiring continuous manual operation or complex locking systems. The system serves itself by using the load to engage the locking mechanism.
Solution Approach 2:
The adjustment mechanism is divided into discrete segments through the toothed bar with notches, allowing the rack to be positioned at specific height intervals. This segmentation simplifies the mechanism compared to continuous adjustment systems while maintaining ease of operation.
2Device complexity
If the lever handle is positioned close to the fire basin for compact design, then the structure is more compact, but the user cannot easily adjust heavy racks with minimal effort
Solution Approach 1:
The lever handle is extended perpendicular to the main structure, utilizing horizontal space rather than vertical space. This allows the handle to be positioned away from the fire basin for better mechanical advantage without increasing the vertical profile or complicating the overall structure.
Solution Approach 2:
The extended lever handle creates a longer moment arm that counterbalances the weight of the rack, reducing the effort required by the user to lift and position heavy racks. The fulcrum positioned near the fire basin acts as a counterbalance point.
3Quantity of substance
If the rack is made large to accommodate more food, then the cooking capacity increases, but the rack becomes difficult to handle and adjust
Solution Approach 1:
The ratchet mechanism allows the large, heavy rack to adjust and lock itself into position without requiring the user to manually hold or support the entire weight during adjustment. The system uses the rack's own weight to engage the ratchet teeth.
Solution Approach 2:
The lever mechanism acts as an intermediary between the user and the heavy rack, providing mechanical advantage that makes it easy to lift and position racks with large food capacity. The parallelogram linkage serves as an intermediary to maintain horizontal orientation during movement.
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 effortless height adjustment of large or heavy food racks with minimal effort, maintaining horizontal orientation and easy cleaning, while being adaptable to various grill setups.
Implementation Method 1
The lever has a fulcrum that is near the edge of the fire basin. Downward pressure on the lever handle supports the weight of the rack and the food. The length of the handle allows the user to adjust the rack height with a small amount of downward pressure.
Implementation Method 2
A ratchet mechanism holds the rack at a selected height, and an arrangement of parallelogram bars maintains the rack in a horizontal orientation.
Implementation Method 3
an arrangement of parallelogram bars maintains the rack in a horizontal orientation
Data Source
AI summary
A grill top that can be removably attached to a barbecue grill fire basin has a lever that adjusts the height of the rack above the fire basin. The lever handle is located well away from the fire. A ratchet mechanism holds the rack at a selected height, and parallelogram bars maintain the rack in a horizontal orientation.