Multi-Blade Roasting Spit for High-Heat Meat Impalement
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Solution Overview
Problem
Existing roasting spits are inadequate for handling large cuts of meat over high heat, as they often warp, rust, or fail to securely impale and hold meat due to design flaws in temperature resistance, tip alignment, size, tie-down holes, and handgrip functionality.
Innovation Solution
A roasting spit with blades featuring a plurality of triangular faces forming sharp cutting edges, made from tempered Swedish Boron steel or hand-annealed stainless steel, designed for vertical or horizontal use, incorporating tie-down holes and a flared handgrip for secure meat retention and comfortable handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metals are used for spit blades, then the spit can be manufactured at lower cost, but the blades warp and rust when exposed to high heat in excess of 750 degrees Fahrenheit
Solution Approach 1:
The patent applies heat treatment parameters (tempering at specific temperatures) to transform the metallurgical properties of the steel, achieving both heat resistance and sharpness. The steel is heated to specific temperatures and held for specific durations to create the desired microstructure that resists warping at cooking temperatures while maintaining edge sharpness.
Solution Approach 2:
The patent uses composite metallurgy by combining carbon steel with specific alloying elements and applying surface treatments. The core steel provides structural integrity while surface hardening creates a wear-resistant, heat-stable outer layer that prevents rust and maintains sharpness under high-heat cooking conditions.
2Strength
If the spit blade is made thicker and wider for structural strength, then the spit can support large cuts of meat, but the frictional force when impaling increases making it difficult to penetrate tough meat
Solution Approach 1:
The patent applies different properties to different parts of the blade: the tip is ground to a fine edge with minimal thickness for easy penetration, while the shaft maintains sufficient thickness and width for structural strength. The blade tapers from a thin, sharp tip to a thicker handle, optimizing each section for its specific function.
Solution Approach 2:
The blade is segmented into functional zones: a sharp tip portion for penetration, a mid-section for structural support, and a handle portion for grip. This segmentation allows each zone to be optimized independently - the tip can be extremely thin and sharp while the handle remains thick for strength.
3Adaptability or versatility
If the spit is designed for vertical use only, then it can effectively roast large cuts of meat suspended over heat, but it cannot be used for horizontal roasting applications
Solution Approach 1:
The spit is designed with universal functionality to operate in multiple positions - vertically suspended, vertically impaled, horizontally impaled, or propped on rocks. The balanced construction and symmetrical blade arrangement allow it to function effectively in any orientation, making a single tool suitable for all common roasting applications.
4Reliability
If multiple blades are added to the spit to improve meat holding capability, then large cuts of meat can be securely impaled, but the device complexity and difficulty of manufacture increase
Solution Approach 1:
The spit features an asymmetric blade configuration with one longer central blade and two shorter side blades. This asymmetric arrangement provides optimal meat securing capability - the central blade penetrates first and provides the primary anchoring point, while the side blades secure the edges of the meat. The asymmetric design is simpler than multiple equal-length blades while achieving superior holding capability.
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 spit effectively impales and holds large cuts of meat over high heat without warping or rusting, ensuring safe and efficient roasting by providing secure impalement and easy handling, even with heavy cuts like brisket.
Implementation Method 1
Tempered Swedish Boron steel is the preferred raw material because of its inherent hardness and ability to perform consistently with high heat. Specially formulated stainless steel that has been hand annealed in a coal fire is the second metal that we've found suitable.
Data Source
AI summary
An improved roasting spit comprising a frame and a handgrip. The frame comprises a frame head portion and a frame handle portion mortised in the handgrip. The head portion comprises a base portion and at least one blade, preferably three blades, extending from the base portion with each blade having a notch for interlocking with a like spit. The frame is resistant to deformation under heavy loads at high temperatures. The spit is employed vertically using a suspension hole in the handgrip or impaled in a ground surface. The spit can also be employed horizontally by interlocking the notches with a like spit, inserting the spit in a stand, or propping the spit on rocks. A tip portion of each blade tapers to a tip point along a plurality of triangular faces forming a plurality of cutting edges that allow the spit to easily impale a large mass of meat.