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US 6,669,467 B2Granted
Gas fired radiant heating unit and method of operation thereof
AssigneeHeat Design Equipment Inc.
InventorRobert E. Kieswetter
Life of this patent
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AssigneeHeat Design Equipment Inc.
InventorRobert E. Kieswetter
Estimating the term…
A heating unit has a cartridge that constitutes a single component, which can be readily removed and replaced with a new cartridge. The cartridge is a plurality of non-flammable layers bound together in a border. The layers include a stainless steel mesh located above a layer of ceramic wool. With the cartridge, replacement can be accomplished in approximately fifty minutes compared to a downtime of a week or more previously.
A method of operating a radiant heating unit having a housing with an open bottom and a cartridge covering said bottom with a skirt extending downward from said cartridge, said cartridge being sandwiched between said housing and said skirt by retainers, said cartridge and housing defining a chamber, said method comprising the steps of commencing with a cartridge installed in said unit, when said cartridge becomes worn, removing said cartridge from said housing on site by removing said retainers, separating said skirt from said cartridge, replacing said cartridge with a replacement cartridge and attaching said skirt to said housing with said cartridge sandwiched in between reattaching said retainers.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Using screens or perforated plates: combustion being stabilised at a screen or a perforated plate
Flame diffusing means: assemblies of different layers
Ceramic: fibres
Metallic: fibres
Term ended 1 Oct 2022 (estimated)
1. Field of Invention
This invention relates to an improved radiant heating unit and to an improved method of operation thereof. More particularly, this invention relates to a gas powered radiant heating unit that can be used with roadway surface reconditioning machines to heat various surfaces, including asphalt over a relatively large area.
2. Description of the Prior Art
In FIG. 1, there is shown a schematic side view of a burner housing;
FIG. 2 is a top view of a cartridge;
FIG. 3 is a partial sectional side view of the cartridge of FIG. 2;
In FIG. 1, there is shown a burner 2 having a housing 4 with a bottom 6 covered by a cartridge 8. The housing can be referred to, more specifically, as a plenum. The burner 2 has a fuel supply line 10, which supplies a fuel mixture through an orifice 12 in a venturi 14. The housing 4 and cartridge 8 define a chamber 16. Within the chamber 16, there is located a deflector 18, which distributes the fuel/air mixture evenly into the cartridge 8. A skirt 20 extends downward from the cartridge 8. The skirt protects the cartridge from physical damage and maintains a minimum distance between the cartridge and a surface (not shown) to be heated. The cartridge 8 is sandwiched between the housing and the skirt.
In FIG. 2, it can be seen that the cartridge has a top layer 22 and a rigid border 24.
In FIG. 3, it can be seen that the cartridge has four layers, a top layer 22 being an expandable metal screen, a second layer 26, located immediately beneath the top layer 22, made of stainless steel mesh (skein), a third layer 28, being an aluminum screen, located immediately beneath the second layer 26 and a bottom layer 30. The bottom layer 30 is made from ceramic wool. The layers are held together by the border 24, which is preferably crimped around the periphery of the layers 22, 26, 28, 30. Seals 32 are crimped between the border 24 and the top layer 22 and between the border 24 and the bottom layer 30 to prevent the fuel/air mixture (not shown) from leaking around the periphery of the layers. The cartridge is a single component.